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  1. dwalker

    Excellent video on making reliable power in a Mazda Rotary engine

    While not inaccurate. It is decades out of date.
  2. dwalker

    Excellent video on making reliable power in a Mazda Rotary engine

    Yeah, E85 even for street cars makes a lot of sense. That insert is inconel. That's probably accurate
  3. dwalker

    Excellent video on making reliable power in a Mazda Rotary engine

    While I do agree about YT for the most part, Rob is extremely accurate and has real world experience behind what he is saying. I run E85 in rotaries a lot. In fact, I ran a car at the Pikes Peak International Hillclimb a decade or so ago running on E85 and it worked great. Excellent power...
  4. dwalker

    Excellent video on making reliable power in a Mazda Rotary engine

    I have been super busy- which is odd for a retired guy- and missed this thread. I agree with pretty much everything you have said. I constantly warn "car people" that messing with the rotary is risky and can lead to very expensive problems.
  5. dwalker

    Add Peripheral Exhaust Port To Renesis

    The Renesis and REW share eshaft dimensions with the Renesis being lighter, and the early rotors will fit a Renesis shaftc with the appropriate bearing
  6. dwalker

    Carb vs. Fuel Injection

    Well I am an EFI guy, so I will always lean in that direction. As a couple points of fact, EFI engines can and do run on mechanical- engine driven- fuel pumps, usually off the end of a camshaft or a Gilmer belt on a pulley arrangement. The entire rest of a proper EFI system is somewhere along...
  7. dwalker

    Add Peripheral Exhaust Port To Renesis

    Kyle's engine never made the power they expected, and they shelved the project. They expected 600-800hp, and never made much over 450. No idea why they are pulling it back out now other than that they might can sell some product- like thier cnc exhaust flange- or get some youtube hits. It was...
  8. dwalker

    Pilot training - the good, the bad, and the ugly

    As normal, I will use my career in auto racing for an example here, referencing the idea that technology will at some point will win out. It will, but as with anything, there is fine print to read- Early in Boris Said's racing career he drove Production Corvettes, which has ABS and a bunch of...
  9. dwalker

    Pilot training - the good, the bad, and the ugly

    There is a great instructor based out of M54 that teaches tailwheel and unusual attitudes/spin recovery. He is always booked 3 or more months out. It was suggested to me early in my training by people I trust to go get the tailwheel endorsement at least, and if I could, do the spin training as...
  10. dwalker

    15% ethanol to be allowed in "normal" auto fuel?

    Cars built since about 1988 have been "ethanol compatible". The biggest issue back then was aluminum fuel components- remember 1988 still had carbureted vehicles- were not protected against prolonged alcohol use. The true issue with running higher concentrations of ethanol is it will clean up...
  11. dwalker

    Pilot training - the good, the bad, and the ugly

    At some point after I complete my PPL, probably around the 100-150 hour mark I am planning to take the Unusual attitude/spin recovery training from a local instructor in a Citabria.
  12. dwalker

    Pilot training - the good, the bad, and the ugly

    I told my story last year/early this year. I took some time off from lessons because I got tired of being weathered out and other cancellations and knew it would be worse in the winter/early spring. Probably get back into it over the next few weeks. I made a video about it-
  13. dwalker

    Whatever became of ......

    I am actually building a large version of this to cut wing, control surface, etc. cores at home. The plans for the DF and the Long-EZ has the longest foam core cut at under 60", which is well within this machines capabilities.
  14. dwalker

    6061-T6 engine mount?

    To some degree that is true. Most of the time we have two throttle positions- closed and WOT. In most road racing we are more interested in traction than power, as we usually have too much power and never enough traction. The best example of this is the difference from the touring cars that I...
  15. dwalker

    6061-T6 engine mount?

    No heat treat and definitely no paint. I considered them consumable parts. Worse thing that happened was the back half of the exhaust went sliding across the track, got mangled, dented, and ground up. Pretty much just tossed them after that. the front half of the exhaust system, including the...
  16. dwalker

    6061-T6 engine mount?

    I may have mentioned it before, but at one point I built 3" aluminum tube "catback" exhaust and mufflers for the race cars. They never melted but they had a very finite and short lifespan due to the heat/chill cycles, work hardening, and vibration. typically they lasted a race weekend and a test...
  17. dwalker

    Thread Rename: How to build a dynamometer for an aero engine running a prop ?

    AEM developed a driveshaft mounted dyno to allow tuning of cars that were hard to dyno using conventional means. Pobably would not be hard to rig one up in a test rig for propellor testing and engine mapping https://motoiq.com/aem-dyno-shaft-on-vehicle-dynamometer-system/
  18. dwalker

    Flight Helmets?

    This is why you should wear a HANS device as well. Specifically designed to prevent basal fractures. The Simpson Hybrid is likely to be the most comfortable to wear in an aircraft, although the original HANS device is not bad. Since I am building a composite plane with "some" rollover protection...
  19. dwalker

    Flight Helmets?

    Having spent my entire career in motorsports watching cars crash, flip, roll, and burn, I take safety gear fairly seriously. In the Dragonfly I have 5-point harness mounts already and will be using Team Tech harnesses with bead-foam seats. For a helmet I currently plan on using a Stilo full face...
  20. dwalker

    Redundant / Failsafe engine control project

    I have a few decades of experience doing this exact sort of thing, because racecars going into limp mode under green because the ECU detects the lack of signal from the rear door lock as the door being open and reduces power output via timing and fuel to 2000RPM sucks... and ABS deciding that...
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