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  1. Bob Mears

    Are you a pilot and/or a homebuilder?

    I think I've discovered that I enjoyed the build more than I will the flying. Now that I'm about finished with mine, I'm thinking about selling it. Might even do another one. I got about 40 hours flying a Cherokee and find it about as much fun as driving a chevette. Landing is the only real fun...
  2. Bob Mears

    13B turbo in a Cozy IV

    Gietzen N755V - VelocityWiki Mears Spitfire RV-8 Project We like 'um
  3. Bob Mears

    Whatcha runnin under that Cowl????

    Mazda 20B Three rotor wankel. 300hp.
  4. Bob Mears

    Spitfire

    Thanks. I started a Yahoo group years ago for the Spitfire builders and Ted is on the group Here's the group if your interested. SupermarineSpitfire : SupermarineSpitfire
  5. Bob Mears

    Mazda 20B

    RPM was 7000 I believe. I'll ask him if he has the plots and post them.
  6. Bob Mears

    Mazda 20B

    Just for every ones info about horse power. My brother just purchased a 20B from Mazda Trix. Carburetor, bridge ported, Dyno'd at 620 Hp on gas. Were adding a blower and expect another 100 hp.
  7. Bob Mears

    Need source for retract cylinders

    It will take some research to find the right one, but my Spitfire uses electric retract and electric flap motors. I was told they came from a hospital bed manufacturer. They're compact, powerful, and fairly light weight. I tried a search for hospital bed actuators and its unlimited looks like to me.
  8. Bob Mears

    Considering a Rotary conversion, need help

    Notice that the prop seems to have a clutch. It doesnt move while the engine is starting, then spins after ignition. And if you will listen close, the engine rpm and the prop rpm change at different points.
  9. Bob Mears

    Considering a Rotary conversion, need help

    For really big horse power, you block those side ports and install single large peripheral per rotor. Then you would have only three intake tubes, and a whole lot easier to build. But it take rather serious engine modification to make those ports and easy to screw up a good engine.
  10. Bob Mears

    Considering a Rotary conversion, need help

    two intake ports per rotor. One large and one small.
  11. Bob Mears

    Considering a Rotary conversion, need help

    I designed it, but had to pay somebody else to build it. I'm not flying in anything I weld!
  12. Bob Mears

    Considering a Rotary conversion, need help

    Yep. Sounds ridiculous I know. But it is a masterpiece!
  13. Bob Mears

    Considering a Rotary conversion, need help

    I might add, these engines are supposed to be that take outs of running japanese cars. In japan, its requird to replace all engines at 30K miles (equivalent kilometers) for emission purposes. These are supposed to be these motors. here's one with the ecu, coils, and wiring harness. ebay #...
  14. Bob Mears

    Considering a Rotary conversion, need help

    Ebay engine $3500.00 Overhaul kit $500.00 Intake Manifold $2000.00 Inconel exhaust $1500.00 Tracy psru $3200.00 Tracy controller $900.00 Radiator $400.00 2 oil coolers $200.00 Misc stuff $200.00 Well, that...
  15. Bob Mears

    Considering a Rotary conversion, need help

    The Spitfire is about done. I lack installing the lights and paint. And the little detail of becoming a pilot so I can fly the thing. I think I'll get my inspection early next year and let the test pilot fly it. Already have a couple of volunteers. I still run the occasionally just to hear it...
  16. Bob Mears

    Considering a Rotary conversion, need help

    http://rotaryaviation.com/ Yes, Tracy is still in business. I chose his PSRU, Engine monitor, and engine controller, and have been very pleased with my purchase. There's several of these flying now and they are proving to be superb products.
  17. Bob Mears

    Mazda 20B

    250 hp can be done with a two rotor pretty easy, and over 300hp with a turbo. The three rotor is 300hp with some mild porting and not a turbo. In drag race world they are getting 1100 hp out of a three rotor! I dont think we need to put that kind of stress on two liters in an airplane. I think...
  18. Bob Mears

    Mazda 20B

    rotaryengine.com | Rotary Engine Specialists | Mazda Performance | RX7 Specialties These are the guys that seem to be making serious advancements in Rotary engines. They are working on a single rotor with stationary gears on each side of the rotor, and making them stackable to add as many as...
  19. Bob Mears

    Mazda 20B

    Actually the crank would not survive with just a bearing at each end, but the crank could be built, as a 20B and just continue stacking on the rotors. there are some 4 rotors out there, and some single-stack as many as you want- kits out there, and right now even some all aluminum rotaries being...
  20. Bob Mears

    Ducted Fans

    That thing needs a rotary engine in it just so it dont sound like a tractor!
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