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  1. G

    Valve Rotation

    Pops, I was going to make a similar comment about your cool running engine. If I throttle back to similar power levels I also get similarly low temperatures. 2400 rpm results in 70-80mph burning a couple GPH with temperatures in the mid 200Fs. You've definitely got me beat in a climb, though...
  2. G

    Valve Rotation

    The heads in my Aerovee use these Stainless Steel valves: http://www.cbperformance.com/product-p/supergripvalve.htm Pops, I'm assuming your valves rotate. Any speculation as to why mine (and others') don't? Here's a post I made a couple years ago that shows the wear pattern on the valve...
  3. G

    Valve Rotation

    I've been flying the engine for about 3 years, but the engine was first run closer to 4 years ago. The first time I noticed low compression was around 100 hours within the first year of flight, but I also wasn't looking for it as closely as I am now. BBerson, can you tell by examining the...
  4. G

    Valve Rotation

    I now have ~250 hours on an Aerovee in my Sonex. I've found leaky exhaust valves three times during that time. I re-lapped the offending seats a couple times, but I'm starting to think the correct remedy is to use something like a Neway cutter to re-cut the valve seat and replace the valve...
  5. G

    Bending Brake issues

    I believe Hot Wings is right. I built an 8' brake from the same plans using this steel piano hinge: https://www.fastenal.com/products/details/0163489 I riveted it on using steel cherry rivets (CCP). Drilling all those holes wasn't much fun. 8' long bends in .025 is no problem. I've also done...
  6. G

    Sonex titanium leg

    Have you heard of the Tracy O'Brien gear legs some builders have used? http://www.tracyobrien.com/stdsonexgear.html I understand they weigh about the same. I mention them because they seem to be a well-engineered alternative. An easier way to save weight is probably the fiberglass parts...
  7. G

    AK-450 ELT phone cord really a phone cord?

    The ELT manual describes the pinout of that wire. The ELT connects identical pins of each plug together. Telephones reverse them (1 to 4, 2 to 3, etc.). You could buy a short phone cable, but you'll need to remove one plug and crimp on a new one upside-down from the original one. It won't...
  8. G

    Aircraft VW reliability - What have we learned?

    Re: Aiecraft VW reliability - What have we learned? I built and now have ~200 hours on a stock Aerovee-powered Sonex. I've never had significant CHT issues. I fly on 90F-100F days in Alabama regularly. On hot days I will climb faster than Vy after reaching pattern altitude to keep the CHTs...
  9. G

    Why is 75% power in Aircraft engines not 75% of Max RPM

    Hopefully Lendo will let us know when we actually answer his question. Here's my attempt: To a good approximation, engine power depends on how much air is passing through it. To understand how much air is moving through the engine, you need to consider both RPM and intake air density (often...
  10. G

    45 Horse Half VW Prop Weight

    I realize this might not be totally relevant to this 1/2 VW discussion, but here is a recent Materials Laboratory Factual Report regarding a failure of a stroked German-core VW crankshaft in a 4 cylinder engine. http://dms.ntsb.gov/public/58500-58999/58722/591778.pdf
  11. G

    Wingboarding

    Here's a video of the WingBoard being tested in a wind tunnel along with a human rider.
  12. G

    Aero injector

    I think the main thing that helps is that steady state flow rate (using Bernoulli's equation) is proportional to the square root of acceleration. For example, a 3G loop entry would only yield a 73% higher flow rate, not 200% higher like you might guess. I agree that the actual increase is...
  13. G

    DIY stall warning sensor?

    Pilots who thought their eyeballs, ears, and ass were good enough continue to die. Pilots transitioning to new airplanes and haven't yet developed the feel also continue to die. I applaud cluttonfred for his willingness to spend a little extra effort in an attempt to prevent himself from doing...
  14. G

    AeroInjector on a Lycoming O-235?

    duplicate
  15. G

    AeroInjector on a Lycoming O-235?

    I have an AeroInjector installed on my Aerovee-powered Sonex and am happy with it. I don't see why it wouldn't work in your case since I understand that the fuel tank is positioned similarly. Typically, the aeroinjector is mounted below the engine where it breathes air that has already passed...
  16. G

    1/2 VW quits and results in a hard landing. Comments?

    We all know about the "impossible turn" on takeoff. I hope I would instinctively consider a 270 degree turn that low to the ground a "ridiculously impossible turn". There are probably at least 3 other ways this landing could have ended that would have been better. Not faulting him for...
  17. G

    New Sonex B-model?

    They would probably say it was based on what they calculated for the Jabiru 2200 which has slightly more than 80 HP. I've heard them support their Aerovee engine performance claims by the observation that the airplane performs basically the same with either engine. They have a dyno chart that...
  18. G

    Revmaster 2300 vs AeroVee 2.1

    I've got ~140 hours on my Aerovee 2.1 powered Sonex in about a year and a half. The obvious "pro" for the Aerovee is how well it fits the stock Onex cowl and how well the stock baffling will work with it. I don't know much about the design of the Revmaster, but be sure you understand how all...
  19. G

    Wingboarding

    CNN recently posted a more detailed video and interview with Aaron, the creator of the Wingboard: Wingboarding - the next extreme sport in the sky - CNN Video I couldn't figure out how to get the video to embed here.
  20. G

    Wingboarding

    I noticed new videos were posted on Youtube, but I'm not the builder and really can't answer any of your questions. His website mentions the tow plane being 38% scale and close-up pictures of the model rider seem to confirm it is 40% scale. His plan all along was to do a 40% scale model before...
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