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  1. T

    Rethinking Propellers?

    You are correct Mr. Zeitlin, these are anecdotes from 10 years of Reno racing, most of that as crew-chief. Some of the stories you heard from your engineering contacts are also correct. There are those who do not understand CG nor structures nor stresses, etc., and there certainly is a lot of...
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    Rethinking Propellers?

    I have a couple of counter points: The Reno Air Races are a very competitive environment and if you spent any time as crew in the F1 / Bi-plane hangar you'd know that leading up to the races there is a game of musical propellers going on. Propellers are constantly being switched and tested to...
  3. T

    Crashes in the News - Thread

    Vmca certainly is altitude dependent. In the case of a naturally aspirated engine power goes down with altitude therefore maximum available thrust goes down with altitude, therefore the Vmca goes down.
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    LS3 conversion for RV10

    Isn’t he one of the guys who crashed another T-51?
  5. T

    1 000 km/h speed with a prop plane ?!

    Boost. Lots of it. Up to 80” of manifold for the start and 60+” to hold the lead. They are getting between 700 and 800 hp from those engines. ADI gets sprayed everywhere to keep those engines cool.
  6. T

    Circuit board / Chip

    Is you gear completely hydraulically operated?
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    Attack Angle

    I used to fly a PL2 a bit. 125hp and 1500 fpm is a dream. She does very well on pavement with no flaps. She does very well off of grass with about 10 degrees of flaps. Full flaps for landing works perfectly well, although there is a camp who will try to convince you the plane is hard to land in...
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    Aileron add-ons - What is this?

    BJC is correct. Squared off trailing edges are best. Marc is correct. Rounded edges are bad. In general knife edge is the worst for a number of reasons: feel, dead band, flutter, recirculation.
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    BD-5A/B factory engines study

    Yes I think that was Bobby Bishop’s company. They had a fleet of SMART-1 Jets. (Look that term up on YT) They flew them pretty heavy, 1200 lbs from memory. They had a couple of crashes too. Bobby sold his personal BD-5 to the Red Bull Flying Bulls. It did not take those guys long to crash his...
  10. T

    Drag reduction with altitude?

    It would hold the same IAS, but TAS would increase roughly 2% for every 1000 feet of altitude gain. GS is a resultant of TAS and wind conditions. Thus talking about GS has no bearing on your initial question.
  11. T

    800cc aircraft engine

    For the record Charlie; they full on stole that from a Calgary based company and bankrupted the company in the process. So maybe they did not steal that from the USA, but they did from Canada, which is pretty close.
  12. T

    Need information to use in designing a variable-pitch propeller

    https://ntrs.nasa.gov/api/citations/19930080999/downloads/19930080999.pdf
  13. T

    Why battery-powered aircraft will never have significant range

    Funny thing if you think about it this way: Carbon based fuels are nature's battery for renewable energy storage. Sunlight was absorbed by photocells, also knowns as leaves, and stored in batteries called carbon bonds. The leaves also produced the toxic waste gas: oxygen. We recycle this battery...
  14. T

    B-29 Replica Takes Shape

    Tom's wingtip video sure makes it look like that's the chap in question:
  15. T

    Miles Aerovan

    Just found this article you might enjoy: Wayback Machine
  16. T

    Miles Aerovan

    Dean Wilson designed and built it for Hubert de Chevigny, a French film maker. The first one has a swing tail and could fit an Avid Flyer in the back. The first one crashed on take-off. The second one was built and travelled around the world for a while before going to the museum. I did not know...
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    Composite Tube Fabrication Methods

    Billski; I made carbon fibre tubes, by slitting PVC tube. Opened the slit using two layers of tongue depressors every 6-8"(two layers was the thickness of the blade I used to cut the pipe). The tube was then wrapped in packing tape. You want the tongue depressors to stick a long way in to the...
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    V12 Alternatives

    In the CJ610/J85 equipped Learjets fuel flows at sea level idle and 45,000 feet were virtually the same. A brisk taxi at sea level is 20 knots. Cruise at 45,000 feet was 445 KTAS (don't hold me to that, my memory is getting old). The engine did make more thrust at altitude, but not that much...
  19. T

    V12 Alternatives

    First things first. The TPE-331-10 is thermodynamically rated at 1020 hp, but flat rated to 940. Turbine engines are naturally aspirated engines. This means that their power drops off with density altitude. Thus by your example of 8000 feet the engine will produce roughly 765hp. However, since...
  20. T

    V12 Alternatives

    For TPE-331 engines it is just about that simple because they run at almost 100%. I’ll grab the altitude decay numbers when I’m back at my desk.
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