jetjr
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Everything posted by jetjr
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The XPB Stage 1 underway.
jetjr replied to bexrbetter's topic in Aircraft Building and Design Discussion
they do have some guidelines for minimum possible loads, like 80kg pilot and fuel for xx minutes flight time This came to light when people were trying to bring aircraft into RAA with questionable AUEW vs MTOW - ie they couldnt reasonably take off without breaking 600kg -
Clarification of 19 and 24 Registration
jetjr replied to old man emu's topic in Aircraft Building and Design Discussion
19 reg have no annual airworthiness to perform, its all just maintenance and any L1 can do it. Until recently there was no difference between first and subsequent owners of 19 experimental aircraft under RAA - not so for VH where builder is the only one who can maintain or sign off. Now its a bit more restricitive and major modifications have to run through MARAP process but still simple for minor changes. 19 cant be used for training but have no requirement to adhere to manufacturers LSA spec. LSA is not automatically be an asset as if your manufacturer, who carries LSA certification responsibility, comes up with expensive upgrades or pointless changes, you have no choice but to implement them. If they ever dissappear you are back to effectively 19 or -E regs anyway. -
I find it tough to believe ASA and CASA would let this happen A nice benefit for them is ability to track and charge for services and maybe even airspace.
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As part of a large reliable wind or thermal generation system they can work great Im sure but the energy to run this battery has to be generated somewhere else. Europe has a very different energy mix and solutions. Where power is used and generated is a key factor too. Response time and transmission losses in AU are pretty bad. The volumes of power outloned above indicate why its hard for renewables to match old generators. If thse pumped hydro setups are simply to secure solar and wind generation, then they amount to a further subsidy. Thats the same sunsidies already pushing up electricity pricing beyond what industry and others can afford. Australian coal os still all beeing burnt, just in places where they dont care or have greater problems to deal with like hungry populations. All.efforts to reduce impacts on earth is valued but at some point we cannot afford any price if it has no impact overall.
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Sure does warrant support but we still need large increase in low cost generation capacity too Battery and pumped hydro have a larger place with renewables increase of the generation mix. The arguement that theres lots of spare renewable power to fuel batteries doesnt make much sense yet either The spare capacity is from thermal generation in low use periods like off peak.
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Dont have references, but its impossible to pump water up a hill with a pump maybe 85% efficient , then generate power through a turbine, which has losses too and end up with more power than you started with Best you can argue is that it turns a large amount of cheap power i to a smaller volume of more expensive stuff. Thermal generators can ramp up and down but its pretty slow process and there is for sure lots of wasted energy. They can be a good thing and are used worldwide and i never said they werent a good option but they dont make power.
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Not askig you to do anything Data modification is required however the more variable the data the more the modification becomes influential to the trends. This is done from all sides of the debate Id be surprised if pumped hydro could reault in 80% net efficiency, pumping alone would be less efficient than that and then theres generation losses
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Contrary to many beliefs Pumped hydro doesnt make any power in fact uses a lot and with evap and losses will burn a bit of water too. Just a battery and not a very efficient one. Still not a bad idea its just still needs big power generated somewhere else. A problem is the ability of some to use complicated ideas and language to influence others and push agendas. Real data is fuzzy at best and it has to be manipulated (smoothed, rounded, seasonally adjusted, outliers removed etc etc) to make sense THEN someones opinion on THAT data somehow becomes fact. I expect most data analysts would reject the data set and declare no conclusion possible if it wasnt such an potentially important issue. In regards to two stroke emissions, I would be surprised if volumes of emissions from these was a major part of Australia's pollution problem. All the old ones arent going away either.
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Turbulence and Safe Speeds to Adopt
jetjr replied to poteroo's topic in Student Pilot & Further Learning
And the rougher it gets .......... the faster you want to get there and down again "moderate" turbulence in a forecasts seems to be a loose term meaning "we arent sure" I agree running low rpm for much time isnt good -
thats 12 deg OAT, 124 kts IAS, I do have carb heat on a little, disturbed air - not heated, helps even EGT out a lot air temps doesnt change it much other than during take off climb, one CHT will get to 150-160. New CAE CHT probes read fair bit hotter, I think its closer to real number. Im keen to lower these significantly.
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Lots of debate points here but as with IFR adsb, not many who paid for the gear are seeing benefits. Significant numbers of IFR aircraft simply are now VFR I also thought ADSB coverage was limited under certain height and what about thousands of non radio or Transponder equipped aircraft We arent just talking aircraft that enter CTA anymore.
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Yes Their idea of affordable is different to mine
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VFR ADS-B Discussion Paper under Preparation - Australian Flying Anyone else guess where this is going?
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off topic but what strobes did you use and did you have any radio interferance problems?
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Avmed have no interest in your DAME advice, they simply use them for their ability to order tests and compile results.
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700 plus and because of value i bought factory rebuild with all new heads, and upgrades for $8 k and thats a 3300 I wouldnt have bought a plane at all if i had to afford a 914
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Couple of broard statements there Plenty of Jabirus last well over 1000, many have top end rebuilds though, cheap and simple. Why would you buy a new one?, More like 15 + 6 Even that 912 would end up costing $20-25 by the time you saw it IF something goes wrong with the rotax you are in deep financial trouble Numbers havent changes since the last few times its been debated Lots fly their own aircraft only becuse the engine is affordable and they can maintain themselves
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That Rotax still going to be expensive once you get it here, USD, freight, GST, and duties No one knows what whole of life costs are for new Jabirus. Still might be good. A different engine as heads and barrels now joined, theres more difficulties with service and case tension when doing so, an early head inspection and guide job is a much bigger deal. Parts pricing is another variable with CAE gone. They look and read well done but have maybe lost some of the nice simple maint features of the old ones. Time will tell
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Jabiru, and Rod in particular, takes advice from no one. Would love the experimental market to be big enough for someone to make aftermarket bits, Rotec have a go. There are aome in EU who fit turbo and efi.
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The CAE unit works brilliantly 80 deg except full power in hot weather and it gets to 90 Theres a guy in UK makes a similar thing
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Nothing wrong with the way the first hydraulic engine looked and upgrades sounded good too. Flight time and operating cost will tell
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AirVenture funding crisis - Facebook statements.
jetjr replied to waraton's topic in Trips/Events/Seats
So arrange a fly in the way you want it Just like the debate on demise of rag n tube, nothing is stopping anyone doing it Events like this dont stop them from happening -
Look at bolly version too, 2 blade. Almost same blades and smaller simpler attacment, also can be adjusted to suit faster wing on J200, Jabiru is pinned. Had one on J200 for few hindred hours and flys great, 125-128 tas at 2850-2900 rpm In either case id rwcommend a dynamic balance too
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Havent seem a pic yet of 3300 with cast case yet 2200 have cast cases, 3300 do not. Last time I was there, the large stack of broken 3300 were kept to be upgraded to new models - not a bad thing as the old cases rarely had problems other than crook assembly Maybe with CAE gone the urgency has ramped up I was told the sump casting was very expensive and it was updated just a few years ago.
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What about qualifications etc of the parts manufacturer for certificated parts? I think new Gen 4 heads and bolts will fit hydraulic lifter engines. After all the older cases are all thats available for 3300 It would take case mods and a full rebuild i would expect. I did hear rumour with some mods they can be fitted to solid lifter models
