kgwilson

The concept has been revived and Regent Seagliders have tested their first prototype which is all electric. The first is a 12 seater with plans for 100 seat versions by 2030.

My initial thoughts when reading the first 2 paragraphs of Post 1 were it is Avgas and lead that has caused the problem. Having seen a number of Avgas fuelled Jab engines pulled apart & dleggs comment, I'd say it is 100% an Avgas issue. Don't use Avgas despite what the Jabiru manual says. They had to say this for their certified engines. Their manuals now say Unleaded RON 95 & above is a recommended fuel but also have a caution note regarding quality control & shelf life. JSL007-7 is the latest fuel guidance service bulletin & is worth a read. 95+ RON unleaded petrol shows to be the best fuel with the same quality control and shelf life cautions noted so that reduces the star rating they provide.

The US made ADSB Out compulsory but only for aircraft flying in Class A, B, C up to 10,000 feet & E airspace above 10,000 feet excluding airspace below 2,500 feet and within 30NM of most airports so the aircraft in this incident had to have it installed by law, which they did. ADSB In is not mandated for any airspace. In this situation even if you had ADSB In you would not have time to look at the screen and there would be potential conflict warnings going off all the time due to the number of aircraft in a very small area. The long nose of the P36 meant that the pilot could not see the B17 at all while performing his left hand turn even though the photo with both aircraft circled looks as though he should be looking directly at it.

Helicopters are great fun to fly in especially one with a bubble canopy where you can see everything. There was a saying many years ago that "Helicopters can't actually fly, they are so ugly that the Earth repels them". No so valid these days as there are many sleep looking choppers. There are plenty of pretty ugly old and military choppers though.

Norma Cobra hose clamps are the best IMO. They are made specifically for each size hose from 8mm to 38mm and are very low profile so don't catch on anything, German made SS and there are special pliers for clamping and unclamping though you can use ordinary pliers. I have them on all fuel fittings in my aircraft.

When I did my PPL all those years ago it was called FRTO (Flight Radio Telephone Operators) licence and was a mandatory condition of attaining PPL.

I have seen a lot of poor wiring on GA aircraft. behind the panel it is often like a birds nest. Maybe not when it was new but with time and instrument, switch & other changes it ends up a mess. Tefzel wire is quite stiff as well so does not lend itself to tight curves in wiring harnesses. If the cause of this crash was fuel starvation then that is pilot error. Mechanical failures are rare even with helicopters. A few years ago a Jabiru 230 crash landed at YSGR when the new part owner took it for a test flight, not having ever flown a Jabiru before. I was one of the first on the scene. The LH wing was damaged and fuel was leaking onto the ground and into the cabin. The floor was a lake of fuel. It didn't catch fire and we were able to drain the remaining fuel from the tank & put the aircraft on a trailer & remove it from the field, then left it in open space for the fuel to evaporate. It was repaired and is still at the aerodrome (with a new owner).

Saw it on the ABC news last night. It is lucky that it was a very light helicopter, it didn't hit anyone or power lines, there wasn't a fire and the pilot was not badly injured. It will be interesting to find out the cause. Power/mechanical failure or Pilot error. My money would be on the latter.

It plummeted, they were forced to free themselves from a sinking aircraft and swim to safety and it was also a precautionary landing, no-one was injured and the aircraft as well as the airport sustained minor damage. What a load of absolute sensationalist crap. Same BS headlines in the QLD murdoch press. Nine news shows a 20 second clip of what looks like a Beaver not sinking being towed by a boat.

Very reminiscent of the Ferris Wheel incident at Old Bar 10 years or so ago. No power then just people.

Never flown a Vixen but the 2 things I didn't like about the Foxbat were the weird position of the throttle beside the seat and the awkward flap handle. Other than that it was as easy to fly as a Gazelle.

That's why I always use my Mr Funnel when refuelling. Filters water, rust, sand, dirt & other debris down to 74 microns. I have not had any dirty fuel yet that I know of. I get my fuel from the same busy servo 3 minutes from my hangar & only looked in detail for a while so could possibly have filtered out some crap. There is always 50 ml or so in the filter sump at the bottom which I use as weed killer at the hangar door.

Doesn't matter who wrote the article. Australias emission standards and fuel quality are poor by standards set in first world markets as are the emission standards of imported motor vehicles. Government handouts have nothing to do with actively discouraging where the future lies. By 2035 you will not be able to buy an ICE engined car. You can choose to ignore the facts if you like. https://www.abc.net.au/news/2021-10-14/australia-dumping-ground-for-polluting-cars-euro-6-standards/100535418

The quality of Australian petrol is amongst the dirtiest in the world. Australia is a dumping ground for cars with poor emission control. This was the policy of the coalition government who also thought electric vehicles were a fad (remember Morrisons BS "won't tow your boat, won't run a tradies ute") & unlike most other countries had zero incentives for people to shift to electric. The current standard for 91 RON in Australia is nearly 15 times lower that the current standard in Europe. The rest of the developed world is making use of Euro 6 emissions and fuel standard while we are stuck on Euro 3 for 91 & Euro 4 for 95. https://www.bgaustralia.com.au/news/technical-advice/australian-fuel-quality#:~:text=The current standard for Australian,Worldwide standards for sulphur content.

I was in NZ in July & the price there was over $3.00 a litre. The government watch dog there found that fuel companies were adding extra margin dramatically as the price increased & had reached an all time high of just over 60 cents a litre. There was a massive outcry as you would expect & the price came down to $2.60 overnight. They were still making 15-20c a litre after that.

In my GA days I flew mainly C172s (M,N P models) and lastly the S variant with a 180hp IO360 engine, and also Piper Cherokee Archer 2 & 3 PA28-181 180 HP carburettor variants. Both had good and bad points. C172 good points - easy to get in & out of, no requirement to change fuel tanks, 40 deg of flap on the early models. C172 bad points - heavy controls, Upright kitchen chair style pilot seating, slow electric flaps, quite noisy. PITA to refuel PA28-181 good points - comfortable seating, nicer lighter controls (quadrant) easy x wind landing/ground effect, easy to refuel & check fuel, good comfortable tourer, more grunt, quieter. PA28-181 bad points - Single door on RH side for access, having to remember to change fuel tanks. Overall I preferred the Archer despite changing tanks every 1/2 hour & getting in and out of it. That most likely influenced my choice of a low wing RA aircraft to build. My Sierra handles X winds very well compared to the Jabirus, Gazelles and Foxbats I've flown.

Fibreglass resin can be a number of different compositions. The most common is Polyester and this is most definitely unsuitable for fuel tanks. The glass fibres are unaffected by ethanol. Vinylester is the chemical composition used in most fuel tanks. I cannot comment on its ability to handle ethanol. The light aromatic hydrocarbons in 98 RON petrol will permeate vinylester tanks and cause a petrol smell. They do the same for thin plastic petrol containers. Vinylester though will not melt or deform. The thicker the wall the less permeation of light hydrocarbon molecules there will be. The same goes for good heavy duty plastic petrol jerry cans. I am sure that there will be a number of epoxy resins that are also good for fuel tank construction. I have done no research on these so cannot comment further.

Even 91 octane is unlikely to cause detonation in an 8:1 compression ratio engine. Something else is awry. I have only used Avgas when away when I could not get Mogas. 95 or 98 runs beautifully in my Jab 3300 engine & the engine stays clean. I don't top up oil between 25 hour changes and the oil is still relatively clean after 25 hours. I have seen numerous Avgas only Jab heads & pistons with so much hardened gunk on them I am surprised the engine still runs & the main reasons the head was removed was because of a valve, compression or ignition problem.

No. All our fuel is managed & in specific "chainsaw" containers with the date of mix & ratio marked on the top & initialled by the person mixing. They are only refuelled with 50:1, 2 stroke mix. The problem was, it was not refuelled before it was used. I have modified our SOPs so a saw is always topped up with fresh before use. If it has not been used for a long time we tip the fuel in to a glass jar. Fresh 2 stroke is green (from the 2 stroke oil used) and clear. Old 2 stroke is brown and can also be cloudy. Earlier 2 strokes were 20 or 25:1 ratio so overheating was more difficult. You always knew the fuel was 2 stroke as the exhaust showed some smoke even when hot. The Stihls only show a minimal amount of smoke right after start up.

Correct but it is when the engine is cold that the damage occurs. This is also when the most wear occurs in all engines. Engines with large tolerances won't be affected as much but modern engines have far smaller clearance tolerances as enabled by technology and better lubricants. Old sloppy 2 strokes will not be too bothered about lean fuel at cold start. They will just take longer to develop full power so they have time to warm up. With a chainsaw, most users start it with choke, once running, choke off, rev it to full power and start cutting. The bloke at the Stihl shop said they get a spate of failures usually in Autumn when people decide to get in Winter firewood and the chainsaw hasn't been used for 6 months to a year.

Read the pdf of the BP report " Loss of light components - impact on mixture" section.

All of the things mentioned were included in the BP study of 2010 which I have posted on this site a couple of times. One thing your bloke did not say is that aged fuel (over 5 weeks old in a vehicle or appliance tank) causes the mixture to be lean and the engine overheats resulting in detonation and piston damage in High Revving engines such as those found in chainsaws and boat engines. I can attest to this after one of the SES chainsaws would not start after being used once after sitting idle for 6 months. The report from the Stihl shop was "hole in piston, scored bore and big end damage" & the saw was trashed. This is not a major issue with a low compression low revving aircraft engine. I have started & run my J 3300A engine after well over 5 weeks without adding fuel & it started first turn of the key & ran well. This is not my normal procedure. That is to add fresh fuel every time I have 30 litres or less in the tank. BP recommended a bit of fresh be used if the fuel has been in the tank for over a week. You do not need much but you will need more the longer the fuel has been in the tank. I keep our 8 SES emergency generators with very little fuel in them and always put 3-500 ml in the tank before going through the monthly generator test process. They are then run under load for 10-20 minutes. The comments re plastic containers is very valid. I have a 4 litre ex oil container for lawn mower petrol. The light components permeate the plastic and the container stinks of fuel. The same is true for the vinyl ester tank in my aircraft fuselage. It dissipates quickly when I open the canopy after it has been in the hangar for a week. The heavy wall plastic containers are much better. The pdf of the BP study is attached. petrol-life-vehicle-tanks.pdf

It doesn't matter whose opinion you get because it will be tainted with that persons personal beliefs and prejudices. It is more valid to get a written statement or thesis from someone on a specific subject and have that peer reviewed. Then you can allocate some credence to the information provided. So a "Professional" opinion is just an opinion and in this case from a Fire Services Engineer about charging electric vehicles in a multi unit complex. When was electric vehicle charging included as part of fire services engineers qualifications?

Fascinating. I'd always known about Albatrosses dynamic soaring and that they have tracked Wandering Albatrosses circumnavigating the world in the Southern latitudes. This takes the phenomenon to a whole new level.

I couldn't see it at all till I went full screen. Wow that thing is fast. The G forces must be incredible.