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  1. J

    Stroker engines in airplanes

    One issue with strokers is con rod angle. A too-high angle produce excess forces on the face of the piston during the power stroke., often producing excess wear. Here is a great, easy-to-understand article by Kevin Cameron. The Long and Short of Connecting Rods
  2. J

    Dream Plane Build / Describe Your Ultimate Homebuilt Aircraft

    As far as the location of the landing gear slab, in my own aircraft I chopped off the Cub-style gear and used a Sonerai aluminum slab. The piece along the bottom of the fuse is draggy. I faired it (foam, glue, fabric, and a dab of paint) and got 3 or 4 mph in cruise. One downside is that it...
  3. J

    Dream Plane Build / Describe Your Ultimate Homebuilt Aircraft

    Single-place rag-tube high-wing taildragger, supplied as a kit. Option for tricycle gear. Laser cut tubes, jig welded sufficient for shipping. Customer finishes the welds. Full welding & paint optional. Cockpit designed as heavy duty crash cage, will accept the weight penalty. Landing gear...
  4. J

    Anyone seen my F-35?

    Hey, BravaCharley: I think Tom Cruise already did that move. JPS
  5. J

    VW Heads for Aircraft - Billet

    Check out Suzuki air-oil cooled motors 1986 through ?2006. Good enough for endurance racing. I had a 2180 vw, used the Hoover oil flow mods, had to go to a much larger oil cooler.
  6. J

    What is your interest and/or experience with homebuilt airplanes?

    Started as a preceptor pup with wood spars. 503. I never flew it in this iteration. Next, a 45 hp Casler VW twin. I did a fabric job on the wings. It took off OK due to long wings. Sluggish roll. Noticed needing top rudder, then sometimes it would switch and wanted bottom rudder in turns...
  7. J

    What is your interest and/or experience with homebuilt airplanes?

    the beast started as a preceptor pup. Three iterations later (a lot of welding) its faster and better-handling bird. I just fly and do routine maintenance now.
  8. J

    Boxer style crankshafts ?

    Hey, PMD, your mystery is now solved. In the 1960s GMC put two V6 engines together end-to-end. 702 cubic inches, almost 1500 lb in running order. Of interest to the corvair tribe is their distributor setup. Take a look. Here's the link: 702ci Thunder V12 GMC - Car Craft Magazine JPS
  9. J

    Boxer style crankshafts ?

    Take a look at the Hexadyne P-60. A flat twin set up somewhat like a Harley. HD cylinders are not offset, they use a forked rod on a common crankpin. The Hex is quite different, uses two small rods flanking the opposite cylinder. Two crankpins. Note that modern vertical twins (say...
  10. J

    VW Heads for Aircraft - Billet

    There are lots of lessons from the Suzuki bikes of the 1980s and early 90s. They raced four-valve bikes using air-oil cooling. The engines had two oil pumps, the secondary had high flow and low pressure, primarily cooled the heads through a large oil cooler. Finning was what I considered...
  11. J

    Jabiru 2200 valve seat question.

    Good info on modern valve seats for engines with relatively high outputs: Understanding Today’s Valve Seats out Dura-Bond are a US supplier of these seats. (I have no financial or otherwise relationship with D-B. See Powder Metal Valve Seats - Dura-Bond Bearing Company D-B makes a power-metal...
  12. J

    Reduction drives

    I do believe Alfa made a similar straight-8 with power taken from the center.
  13. J

    I finally became a pilot, and now I'm completely confused about my future build.

    Build a Legal Eagle, fly it for two years. You need the experience in the air more than spending hours and hours in the workship. Also, rent a few different airpalnes. Build the LE with full covering, it will cruise at 70 mph. A gas tank as per design, plus construct a gas tank that...
  14. J

    LPA is history

    Only adventurous women fly. They are fairly few, as women are naturally more risk-averse. This is actually a well-discussed issue in the academic field of evolutionary psych. Not going to change. Noting that fine looking women are used as eye-candy at sales events: guys, they are pushing...
  15. J

    Nerd alert! Airfoil Comparison: Modified NASA 65018 vs Clark Y, and NACA 23000 series

    Just FYI concerning the Titan Tornado wing. This is just my personal experience. I flew a Titan Tornado 2 with a 912 on it for a while. I climbed to 5000 ft and did some stalls. It would actually vibrate under light throttle conditions, with the flow detaching and re-attaching. Just that...
  16. J

    Bing 94 Carb and fuel pump

    I found a reasonably priced source for the float. Want to sell the fuel pump separate? Thanks for your quick reply. JP Straley
  17. J

    Bing 94 Carb and fuel pump

    Still available?
  18. J

    Plasma Stream drag reduction

    Your question about amps wires weight is exactly what I'm asking. Those guys at Plasma aren't very chatty. I have a draggy little thing based on the old Preceptor. A boxy welded steel fuse. There's a plane that might benefit from simple improvements to fuse drag. My airplane has no flaps, I...
  19. J

    Plasma Stream drag reduction

    Hello Everyone: I've been reading about a drag reduction device aimed at reducing drag on large trucks. Plasma Stream is the company that advertises their technology. At the web site it shows a video, a flat plate in a stream of air. Increase the angle of attack and flow detaches, which is a...
  20. J

    Bing 94 parts needed

    Hello Everyone! I have a jab 2200A that I've been putting on an airframe for two years now. So, first start, right? Eh, gas floods out the carb and I find I apparently have a hole in one of the floats. I'd like to put new floats and float needle/seat in it, but gosh the prices for new...
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