Markdun

Exactly Glen. But it’s worse than that. My 25yo son was up snow skiing a few weeks ago...and working up there. A group of young 20 something women came in to the shop and refused to put on face masks because, ‘we’re vaccinated, we don’t need to’, obviously not realising that vaccination only reduces transmission and reduces susceptibility. My fear is exactly that....the vaccine will encourage risky behaviour and the outcome will be worse, particularly so given the R0 of the Delta strain.. Linking vaccination rates to ‘freedoms’ encourages such behaviour.

I agree with you Turbo....particularly in relation to morons leaving the doors (international borders open) and despite having over 18 months, failing to build an effective mask (quarantine) for those that come through the open door. But my point was, that you can do still do stuff to reduce your risk of getting infected and for some people being slow to vaccinate (hesitancy) is or was rational, not loopy. My plan, given that WHO has only given the vaccines ‘emergency approval’, the virus and vaccines being novel, the moral idea of greater need for vaccines in other countries (remember it’s a global issue) and my trust in the Australian government approval is zero, I wanted to wait and see how it played out for those willing to be guinea pigs...planning to get vaccinated in October. I do have a yacht and bush block to go be a hermit. However, because someone (we control our borders) left the door open (or the sea cock open) and someone else (McGuire’s mate) didn’t do the track, trace, isolate effectively, I re-computed my considerations and brought getting vaccinated forward......still made me exceedingly cranky because had the two someone’s done their job the vaccine that went into my arm could have gone to a doctor or nurse in PNG, Timor or Indonesia, where Covid is doing much more harm than here. Arron....you are on to something. Look at the USA where they have not approved the ‘EU’ vaccine (AZ) but have approved the US vaccines. You would be surprised how commercial interests are able to promote and ‘market’ a research paper without being seen to be doing so when that research benefits that company. Too often scientists are ignorant of this. There is a great book titled ‘Manufacturing Consent’ that deals with this.

Glen, I’m the same. The calculation of the risk of AZ...is the low one or two in a million of AZ. But the risk of death from Covid is the risk of catching Covid times the risk of dying once you have it (one in five if you’re over 80, probably less than 1% for someone less than 60...it’s a log relationship to age, or an average of say 2.5%). This suggests that it would only be wise to vaccinate with AZ if your risk of catching Covid is greater than 8 in 100,000. And to some extent this risk depends on one’s circumstance (do you work in a high risk job say at a hospital, school, Bunnings, do you live in higher density dwellings, in a city etc) and ones behaviour (as we see in the UK where older people are hiding themselves away and young people are partying). So the vaccine hesitancy, particularly for people under 70 who are not working, not keen to socialise, can hide out on their yacht or bush block, is (or was) rational. It wasn’t (isn’t?) axiomatic that the ship would sink. But that has changed because of our ‘captains’ determination to put those life jackets to use by secretly opening the sea cocks and leaving the hatches in the water tight bulkheads open, pretending that if everyone wears a life jacket it’s back to normal, and if someone isn’t wearing one it’s their own fault. The guys at Chaser also make an analogy of someone running a nuclear power plant leaking radiation with radiation suits being analogous to vaccines.

If there is one thing you learn from history, it is that human societies do NOT learn from history. Recent history....over 90% of the UK population has Covid antibodies either ‘naturally’ from having Covid or from vaccination. Over 70% are vaccinated, over 50% ‘fully vaccinated’. Yet with the Delta variant they are now tracking at 80 deaths per day (7 day rolling average...source Ourworldindata) with a population of 65million. And this is after their accumulated deaths from Covid is nearly 2,000 per million (130,000). New Covid infections each day recently peaked but it has now been stable for a bit at 400 per million per day (ie. 26,000). That’s the bad news; the good is that with vaccination and natural immunity the death rate per infection has fallen from 3% to 0.3% (source. Ourworldindata) By my reckoning if we follow with the UK example (let it rip, it’s your choice to vaccinate, the young have the right to go out, and bugger the oldies rights...if they want to live they should stay at home) as per ScuMo and Gladys wishes, then we can be looking forward to 30 deaths per day (10,000 pa) and 4,000 new cases per day EVEN WITH 70% Vaccinated. It seems that if we are to achieve the worst case scenario posited by the Doherty Institute modelling (3000 deaths per year...ie the same the flu) this must still involve to some extent (& probably a lot more than anyone wants to admit): quarantine, track, trace, isolate and lockdowns to prevent and contain outbreaks, ie. there is no get out of gaol card from vaccination (just a lot less grief). People should remember that in situations like this we are being managed by government propaganda and spin (oops, I meant ‘information’). They probably honestly believe people need an ‘exit strategy’ for morale....and hence, ‘vaccine will get us out of this’, when in fact nothing will, and our current mess really is ....it’s a $&cking pandemic and we elected a bunch of fools. To those that claim the low death rates in Australia are due to government action (as opposed to our isolation/remoteness and chance), I’d again say look at the history. Morrison delayed stopping direct flights from Whuhan because of the commercial interest of a gambling corporation in Melbourne, he allowed the Covid/Ruby Princess to dock in Sydney, early all the aged care facility deaths in Victoria were in federally regulated institutions, he refused to provide federal quarantine for inward international travellers despite the Cth Constitution (the States instead implemented ineffective self and hotel quarantine), and all the outbreaks resulting in lockdowns for Melbourne and Sydney, ONLY arose because of Morrison’s abject failure to provide quarantine and him maintaining a ‘Claytons’ closed international border for movement of people...and that is the reason we are left with lockdowns and vaccination. Sheet the blame home where there is fault, not the victims of his incompetence. Want a comparison....look to the east...NZ. At least tomorrow I’m installing new brake cables in the Corby Starlet which will need at least one T/O and landing to ‘test’, and maybe I’ll start building the acrylic sheet oven for moulding a canopy.

Turbs, you are wrong on the US and Australia on separation of powers. The USA has much stricter separation of powers than in Australia. In the USA the ‘Executive’ arm of government is completely seperate to their parliament (Congress). Their Executive is headed by the president who is ‘the boss’ of all public servants, subject to the constraints of laws passed by the seperate Parliament. Their judiciary is seperate as is ours federally...actually we copied the US system on this. However, the big difference is that our governments (the ‘Executive’) are not ‘separated’ from parliament. We have what is called (perhaps incorrectly), ‘responsible government’ in that tge Executive is drawn from parliament and responsible to the people through parliament, whereas the US ‘Executive’ is responsible directly to the people via a popularly elected president. The States in Australia have the British tradition of no formal separation of powers; they only practice separation of powers from choice, not law. The Vic govt may choose to allow their CMOs and other experts to do their own thing without political pressure but this is just an indicator of a wise government....a bit like when Kevin Rudd accepted the advice of Treasury when responding to the GFC. Just because a person holds a statutory position, like a CMO, does not protect them from political pressure. Just look at the sports rorts, where a statutory body with the legal power and duty to allocate public funds was effectively totally bypassed by a Minister acting loose and fast with the rule of law. I have decades of experience in the federal public service and a couple of examples...I was asked to write a robust piece on the empirical evidence of the costs and benefits of privatising a certain type of large government owned business. I did this, and my paper was returned from the Departmental secretary with the instruction, ‘remove all arguments and evidence that don’t support the government’s position and submit to the Senate committee’. Or another time I was directed by a Minister to ‘invite’ the head of a statutory regulatory authority (like CASA) for a face to face meeting with the Minister. That Minister told me to ‘make very sure he knows this is not going to be some cosy chat, but a real dressing down’.....that was one difficult phone call for me. My guess is that that meeting was cosy and short because all the Minister had to do is say, ‘I think Mark explained to you the issue I’m not happy about’...’Yes Minister, I’ll fix it’. This was decades ago in the era of an independent public service....it’s much worse now. Skippy mentioned the comedy, ‘Yes Minister’. But we also have the Australian distopian documentaries of the ‘Hollow men’, ‘Utopia’ and now the reality show on all channels called, ‘the Morrison/Murdoch Government’.

Steve, in answer to your question regarding the Tecnam trim problems...yes. We had thought originally the issue was a dry joint in the cheap audio connector to the trim motor in the tail. I took this apart and cleaned all the red bull dust out at Kal. And then on the flight back, we noted the trim worked better on the right stick compared to the left. That meant the issue was either the ‘left-right’ toggle, or the left stick microswitches. The owner (an electronics guy) first replaced the toggle, then the stick microswitches. However, he eventually found tge problem as being a combination of the stick microswitches and the savage bending and compression of the wires to those microswitches....it was in the top of the control stick. It took a fare bit of effort to resolve, because once you released the compression and bending when you disassembled the head of the stick the trim worked. Put it back together, and then the fault again.

Actually Skip, you are both correct. CMOs generally (it depends on the legislation) make what is called a statutory decision, and the views or opinions of the Minister or government would be an irrelevant, and indeed improper, consideration in making the decision. If the decision is challenged in court by an aggrieved person, and again generally a person affected by the decision could commence proceedings to challenge it, a court would void the decision if such an improper consideration was made. However, CMOs, like police commissioners, prosecutors, magistrates etc only hold office (ie. their job) at the pleasure of the Executive arm of government....they can be fired at the whim of the Premier or the PM. This is why judges are appointed for life, including state judges if they are able to hear federal matters under the cross-vesting arrangements. They cannot be sacked at the whim of the government.....only by both Houses of Parliament. Therefore, Skip, you are also correct as it takes some courage for someone to go against the views of someone who has the power to sack them. I’ll also chime in on kgwilson’s piece which on the whole I strongly agree with. Two issues. First be very wary of ‘pre-publication’ research...this was the reason behind Trump’s chloroquinine, and recently ivermectin claims. My wife is a frequent reviewer of research articles, including the BMJ, and she gets some pretty crappy research papers. The most common is with researchers making conclusions either not backed by their own data, or making strong assertions when statistically the data had insufficient ‘power’ to draw any conclusion other than that someone else should do a larger more controlled trial. Second, the balance of risks is not just the risk of an adverse event from vaccination versus the risk of severe illness or death from Covid; it is the risk of adverse vaccine event vs the risk of illness or death from Covid times the risk of contracting Covid (this is the George Pell defence, although a virus does not have ‘agency’ like Pell..a small probability times a small probability gives an exceedingly small probability). This makes a huge difference, and given recent events as the risk of contracting Covid increases, it makes the case for vaccination stronger...probably a no brainer for someone living in Sydney, but an entirely different matter for a retired guy isolated at his remote rural shack next to his hanger and airstrip. The conspiracy theorist in me can’t help but think that Morrison and Gladys were happier for weak border controls and ineffective quarantine to increase Covid, as doing so would enable them to blame victims....it’s your fault you’re not vaccinated, whereas the only person to blame for sloppy border control and ineffectual quarantine is Morrison (& those in the HoR who still have confidence in him). And in creating a disaster the conservatives think they will do better in the forthcoming elections. But the rational me thinks it’s more likely that they’re just hopelessly out of their depth, incompetent, and criminally negligent. Yep, NZ is the gold standard. I say we should immediately declare war on NZ, and then on the next day capitulate and surrender. Under international law NZ would then be governing Australia.

Mmmm....reminds me of a ‘fuel leak’ from the port wing root in a Tecnam noted in a condition report. A friend had just purchased the plane and had a LAME at Northam airfield fixing the list of faults (there were a few). I was there to do the delivery from WA to the east. Check out the plane, including insisting a W&B after the two blade wood prop was replaced with. a heavier 3 blade carbon & alloy job...LAME said ‘they’re about the same’. Anyway took it for a test fly...very nice, except the electric trim was not working...or only intermittently..another fault noted on the condition report and signed off as fixed by the LAME. Took the plane to fill her right up for the flight to Kalgoorlie, hopped in the left seat to be given an Avgas shower from the port wing root...but that was fixed by the LAME, right? ‘ We couldn’t find the leak so we just cleaned up the stains down the fuselage caused by the leak’....back to the shed. OK the cause. A plastic vent line of the port wing had cracked. The tube runs from the outboard top front of the tank to the wing tip. It had cracked at a low point where the vent line was resting on the bottom skin of the wing. If the tanks are full and the plane was inclined to port by a small amount, the vent would siphon fuel out into the wing, and this would then flow inside down to the wing root, until the fuel level dropped below the vent height. I reckon you could lose 10l; more if you left the two fuel cocks on. So just be careful with those vent lines. oh, I won’t mention the wrong diameter oil lines, the loose jubilee clips, the coolant hose touching the exhaust, or the radiator rubbing on the cowl from the rubber replacement done at the same time.

Spacey, a friend of mine’s wife is legally blind (in her early 60s) and, as you would expect no drivers licence (they are not in the NT). She manages to ride her electric boosted bicycle the 3km to the shops and back (on the road mind you). Exercise...sort of...and shopping, but probably more risk than covid.

Oh dear. You use ALL the tools available in your kit, you just don’t ditch some, because they’re not 100% perfect. Laws against murder don’t work...people still murder ...but we don’t ditch those laws! Listen to the wise people at the WHO. They have been exceedingly critical of the UK’s single policy of vaccination and let it rip. They were blunt, calling it ‘stupid’ and dangerous. It is increasingly likely that even with an unachievable 100% vaccination rate, covid will still be active in the community, including killing people....vaccinated people, albeit at a very much lower level than if people weren’t vaccinated. The Grattan Institute came out today with an 80% vaccination target to ‘open up’ the economy, and they admitted that covid would still be running rampant at that level of vaccination and implicit in this is that a small percentage of people will die each year as a consequence.....10,000, 25,000 pa what, they didn’t say? it might be deliberate policy to “let it rip’ a bit to scare a lot of people to get vaccinated....it worked for me. But how many people died as a consequence? In my view pretty immoral. We’ve got a great advantage over most other countries, let’s not trash it more by ditching proven effective public health measures, like quarantine, track, trace and isolate, face masks, avoiding other people, and vaccination.

Alan, no it won’t, unless you have gravity feed, ie. no mech pump.

Yep, and some yank could do that in a twin at a thousand foot or so, dead stick, do a wing over or two, land and roll to his gate. Some guys have energy management down to a fine art.

If I recall correctly didn’t you run out of fuel after landing and while taxiing to the fuel bowser after a flight from Porepunka?

Spacey, I think there is a reasonable article in the Guardian today that tried to answer this question. I don’t know. Tthere is not a lot of empirical statistically robust research. There is the general argument that vaccinated will have less severe outcomes.....but by how much and what proportion? There are growing comments about children both increasingly contracting the disease and getting long covid/complications with the Delta strain. It’s good of the USA and UK to have experimented (sorry trialled) vaccines on their children for us. I do recall early on in the pandemic that a number of hospitals and obstetricians were demanding newborn infants be separated from their mothers (& forced csaesarians in one country) despite the absence of evidence of any benefit. A similar thing happened with HIV in Africa which resulted in thousands of unnecessary infant deaths. It’s true we have to make decisions with imperfect information (which would have been better if Morrison had not completely bungled the borders and quarantine), but too often the absence of evidence is wrongly confused with evidence of absence.

Alan, I have two aircraft, both powered by a Jab2200 with a mechanical fuel pump and with a facet electric ‘boost’ pump in series for T/O and landing. One has a mid wing and tank (shoulder level) with a simple vented cap, probably with some negative pressure as it slopes to the back. This works fine, and will go ok with just gravity feed. The other aircraft has a low wing and the tank is mounted above ones’ knees. It has a forward facing vent. I tried gravity feed with a boost pump in parallel, but that set up failed the gravity feed ground test, hence the mechanical pump plus facet. Over 200 hrs in each. I can’t tell the difference. Both tanks have finger strainers and fuel filters to eliminate problems of bugs and blown grass in the tank. Cheers, Mark

Ok, I’ll now stick my oar in. First, there is BS everywhere on this issue. Second, for good trustworthy and reliable information listen to the WHO twice weekly press conference. Also look at the data and graphs on the covid pandemic in ‘ourworldindata’. Third, acknowledge that not all outcomes are due to guvmnt or individual action...chance and environment also play their part. Australia has had good outcomes mainly because of our remoteness and isolation....oceans are good. Had the premiers not forced the prime minister to close borders we would have been worse off. Fourth, the vaccines. Some like AZ (& a host of others) have ‘emergency approval’. In some countries (USA) others have full approval (mRNA). Fifth, the vaccines are targeted at reducing deaths and severe illness...they do NOT make people immune, nor are thet tested for reducing transmission. For example, in the UK over 50% of the population are ‘fully vaccinated’ (over 70% just one dose), and as a result now over 90% have some immune response to Covid,,,,either because they have had the disease or have been vaccinated. The good news is that the UK despite having an obscene death rate to date (a total basket case really) deaths are now down to 40 per day (and yes it is both vaccinated and unvaccinated). The bad news is that even with such high percentages of vaccination or ‘natural immunity’ their case numbers have been massively growing and hospitals are at capacity. The evidence there is that being vaccinated reduces getting the disease by about 50% and similarly it only reduces transmission about the same (this is still with over 90% efficacy for death or severe morbidity). This is still extremely good, but it is also why it is completely nonesensical to allow vaccinated people to travel or ignore other public health measured, like mask wearing. Indeed it is possible that vaccinated people may be more likely to spread the disease precisely because they wrongly believe they no longer need to be careful. Sixth, the other lesson learned from the UK is that the ‘let it rip in a fully vaccinated population’ policy, is likely to substantially reduce deaths (compared to an unvaccinated population), but it nevertheless will result in increased deaths. My back of the envelope calculation is about 5,000 to 10,000 per year for Australia. The question is, what is an acceptable number of deaths per annum to open an economy that is doing ok without opening up? Influenza currently kills about 3000 per annum. seven, with the Delta strain that has almost double the transmission of the original one, it is likely that ‘herd immunity’ will not be reached even with 100% vaccinated. I expect some clever footwork by the boffins on this, with a fudged answer that assumes a certain ongoing death rate. Eight, there are several studies on case death rates by age, gender and race in quite divergent cultures and countries. The relationship is pretty uniform and the main findings are that death rates is a log relationship to age: over 80..20%; over 70 ...10%; over 60...5%; under 30...bugger all. The average of 3% is pretty meaningless. This is why the advice on AZ and age has changed. Nine, the problem in Sydney was caused by failed border control; too lax entry, too many exemptions, no federal purpose built effective quarantine facilities (despite having 18 months to do so). Had the federal government fulfilled their Constitutional responsibilities on ‘we determine who comes across our borders’, we wouldn’t need to be in the mad rush to vaccinate. Instead, it could have been more orderly, and more moral (in assisting our neighbours in more need). Instead the hapless feds rushed to purchase vaccines, driving up the price and reducing supply for those in more need, and botched the delivery. Ten, if you want a good comparison use NZ, Taiwan andSouth Korea. If you want to look at failed countries look at the USA, UK, France, Brazil. I used some comparison with the UK....but be careful....they have effectively euthanised a substantial proportion of their over 70 year olds, so their reduced, but still significant, death rate may be due to eugenically thinning out the weak. Eleven, when you get vaccinated, keep doing the other stuff as you still are likely to be contagious!

I think you will find the federal auditor, Grant Hehir, has quite a good track record. This is not a paper clip counting exercise. I expect the auditors people will not only listen to CASA, but also talk to those in the industry. i, too, have had experience in accompanying auditors on random financial compliance audits a federal grants program which I managed (generally spoken of these days ‘rorts programs’) ....I was amazed at the sloppiness of state QANGOs like regional development boards versus the meticulousness of community not-for-profits. My program was also subject to a federal auditor-general performance audit. They reasonably quickly identified a program we continued funding millions of your dollars to, that had absolutely no hope of succeeding, including my note to our ‘board’ that handing out a $5000 cheque to every rate payer would have delivered 4 times the benefit of the proposal they agreed to fund. Luckily for my Dept I also convinced them to advise the Minister to abolish that part of the program...and he declined. The Auditor gave that a tick, because the stupidity was a well documented political decision, not unlawful or bad administration.

Good point. I thought the same about Airservices ‘land grab’ for class C airspace at a time of falling GA traffic. My impression is that tge auditor is particularly interested in how CASA does or doesn’t do enough on compliance/enforcement in RPT and commercial, along the lines, it’s no good having rules if everyone, particularly the shonky ones, are ignoring them.

Here is your opportunity to let our wonderful federal auditor (of fame for exposing all the federal ‘rorts’ in spending our money unlawfully as per the sports rorts etc etc etc etc etc). But remember the AG’s intention is that CASA more effectively and efficiently implement and enforce the legislation and sub-ordinate regulations, not assess whether such regulation is over-burdensome or unecessary. https://www.anao.gov.au/work/performance-audit/the-civil-aviation-safety-authority-casa-planning-and-conduct-surveillance-activities

Bruce, navigation is not only knowing where you are, it has to have meaning or context. An aviator got lost in a hot air balloon, so he descended over a golf course and asked a couple of guys playing golf where he was. Their answer was, ‘you’re in a hot air balloon 200’ above a golf course’. He then asked if they were accountants, to which they responded, ‘how did you know?’. ‘Because the answer you gave was precisely correct, but absolutely useless’. Jimmy Cook was a superb navigator, but when he cruised the Australian east coast he may have known his lat & long, but his charts didn’t show where the land and water was etc. so despite knowing his lat and long, he had to navigate with the original instrument....the Mark 1 Eyeball and a string with a lead weight on the end. Knowing his lat and long enabled him to make an accurate chart for others....indeed some of the charts I’ve used in 1985 were marked as Lt Cook of the RN being the chart maker.

Spacey, my reliance on the sextant was pre-GPS days. If it broke, you fall back on dead-reckoning, or you do a Jimmy Cook, ie. eyeball navigation. Some yachties still do a James Cook for east coast navigation, ie. keep the land to port. This reliance on instant modern equipment is often just too much. At work, a colleague thought up a policy proposal to have emergency phones every 5 km on all major highways because it might save a few lives despite the massive cost because, ‘how do you call for help, if there’s an accident’? My response was you do what people have always done...knock on the door of the nearest house and ask them to call an ambulance, or stop a car and ask them to do so at the next house’. Evidently this is too ‘embarrassing for young ones.

Like I said, if the screen goes blank, there is the colour based navigation option. But seriously, our primary navigation instrument is the eyeball, hopefully both of them, which should find you a paddock to land in. If not, you shouldn’t be flying. I do carry an orienteering compass and a paper map with me, despite the colouring navigation option. I’ve used this compass to sail single handed across thousands of nautical miles (with charts, a sextant, almanac, watch and calculator/log tables)...if it’s good enough for that. However, this is not life saving stuff to have, just it would be nice to get to where you want to go.

I’ve still got a nifty Z80 based computer that I built a little while ago. When connected to a HF radio’s audio output and a thermal paper printer, prints out the BOMs weather reports including actual and predicted MSL pressure charts. A toggle switch changes the program (I think it’s called an ‘App’ now) to Morse code decoding, assuming you re-tune the HF radio to an appropriate frequency (like RAN ships)...quite interesting if you want to learn which admiral is moving ships for cocktails etc. At least this was all from the 1980s. I suppose it still works. However, I’ve never really worried about what if the GPS system goes down and I’ve never had a need to look at a magnetic mechanical compass in an aircraft. If the GPS system is out, there’s a lot more grief for others than just me....and I can always revert to the colour and temperature method of navigation, ie. green OK; red, too far west; blue too east; hot too far north, cold too far south.

I forgot to mention. Laminations are used because wood shrinks and expands with changes in moisture content, and this doesn’t occur evenly. Laminating makes the plank/propeller dimensionally stable with changes in moisture content. Length wise, along the grain, wood moves little ~1% or so. Radially (imagine a line from the centre of the tree going outwards horizontally) ~5% or so. Tangentially (also horizontal, but parallel to the growth rings ~ 8-10%. This is why many timber boards twist cup and split. Of-course, some timber’s are pretty dimensional stable with moisture content, eg western red cedar, and this is why this wood is often used in windows and boat building despite being soft (it’s also toxic and doesn’t rot). And if you purchase radially sawn timber (the yanks call it ‘quarter sawn’) as you ought to for aircraft, then you minimise twisting, cupping and splitting, but you don’t get rid of it; laminating does. Also laminating overcomes small defects, like knots, gum pockets, grain misdirection etc.

Spacey, that’s an excellent idea. My Jim Maupin designed Carbon Dragon had lots of wood-cf composite construction. The wing main spars (full cantilever wing 44’ wing span) had caps of spruce and carbon fibre. The spruce was in the shape of a ‘U’ that tapered towards the wing tips. The carbon was ‘tows’; a specified number went full length and then there was progressive less full length. You had to make a jig for the carbon to roll off a roll, down through an epoxy bath, up to be squeezed to get rid of excess resin, then along the length of the spar cap. The wing ribs were also made with 1/4x1/4” spruce strips with a 3/32” groove routed down the centre (another jig), and carbon tows were laminated into that groove (similar jigging as for the wing spar caps). These made exceptionally light and very rigid and tough wing ribs. CF has good compression strength, unlike Kevlar, but in most work the compression forces are handled by the resin. But this is why cf laminations are very stiff, again unlike the floppy nature of Kevlar laminations. The problem with cf is that with such a low modulus of elasticity it bends only a very little and then fails completely.....it’s brittle. The combination with wood as a composite in the Carbon Dragon seemed to work well. However, Kevlar was the main tension load bearing material from the wing spar (and anti drag) attachment points to the fuselage. Back to prop building, the question would be what are you trying to achieve by laminating cf between the wood? It would make it much stiffer, which could make the prop more efficient, but it would also make it less resilient and perhaps less forgiving to engine power pulses say. I’d also give a warning from my experience...cf is not easy on tools...if you intend to do any shaping, cutting, sanding etc...good luck.