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  1. K

    modern equivalent to doped canvas?

    lots of pictures of skin boats in their web site.
  2. K

    carb adjustments for Mosler CB-40 on a Mini Max

    Propane or butane will also work for finding intake leaks. And a recent post in FlyCorvair was about troubleshooting an engine down on power at full throttle. To make a long story short, the cam timing was off. Camshaft vs crankshaft was at least one tooth out. I don't know of any way to check...
  3. K

    P-51C at ~70% scale as ultralight?

    Your reward will be TERRIBLE aileron response. You want you ailerons big at the wingtips, to maximize their moment arm on the roll axis. The Thatcher CX-4 tapers the ailerons like this, and the Only Fair aileron effectiveness is one of the few complaints about this airframe.
  4. K

    Any good sites or tools to find hangar or shaded storage?

    Their is such a thing as purpose designed "shade cloth". UV resistant, which weedmat is not so much, and it's much better structurally. Shade Cloth: Lowest Prices, Best Shipping | Greenhouse Megastore
  5. K

    Bending Yield Fty Recycle Yard Aluminum

    In the traditional Brinell test, the ball size, and the indentation pressure are standardized, for several reasons: comparability between operators and across metals, and to allow use of pre-computed tables are a couple that come to mind. The app Proppastie links to allows any size indenter and...
  6. K

    Rotor hub for pulley end

    I bought one from Steve Bennett when he was still alive and running Great Plains Aircraft Supply Company. Later it seemed like they only wanted to sell the complete kit for the flywheel drive. This is Aluminum, and only the left hand threads (to "pump" oil back into the crankcase) and the...
  7. K

    Used Kohlers, POTENTIALLY suitable for SMALL, LIGHT aircraft use, are dirt cheap

    I bought one, a CH25, for about 1/4 of new. Particularly if you're going to be breathing on them anyway (internal and external mods) and plan to take it to bits, it makes starting with a Kohler at least as attractive as a new two cylinder Predator, which has poor parts and technical support...
  8. K

    Using Epoxy To Seal Wooden Wings and Fuselage

    WEST was designed for use with wood, and is more flexible than epoxy specialized for lamination. I would NOT use any of the other epoxies in the Aircraft Spruce catalog. I WOULD consider other brands of BOATBUILDING epoxy, such as RAKA or Total Boat. If you live in California, TAP Plastics...
  9. K

    What did you do on your airplane project today?

    I started working down the 4th test club blank for my Kohler V-twin FWF development project. Eiffel test clubs to establish the hp curve.
  10. K

    Stewart Systems Alternates/substitutes

    If it's Shiny yer after, Polythane. Saw a beautiful cub last weekend. Stits all the way. Silver, then a white coat, and Cub Yellow Polythane. It was drop dead gorgeous, and the cover job was 5 years old already.
  11. K

    Stitch and glue (or tack and tape) airplanes?

    "Tortured" plywood is actually a slightly different technique, of inducing <slight> COMPOUND curves in plywood, by forcibly manipulating panels that have been edge joined. The boats shown in this thread have used "developable" sections, where a single "ruling" line defines the curvature. The...
  12. K

    Stitch and glue (or tack and tape) airplanes?

    Given the frightful expense of high quality thin plywood, I'm not sure I see the advantage. The weight might be a little high too. And would you put the fillets on the inside or the outside? I've seen boats built both ways. But to answer your initial question, I've never seen or heard of...
  13. K

    Cam for 1835cc

    Use ratio rockers to get a little more lift. Schneider cams has a grind developed for wind machines to protect orchards the works great if you really want to spend your stimmy check.
  14. K

    Source and or recommendation for low speed flexible rotary cable drive shaft needed.

    Have these guys make up the length and fittings you need Speedometer Cables USA- Cables and Housing Assembly
  15. K

    A new, simple looking Czech(?) single seater

    Hirth F33 is the current Engine Of Choice. The smaller Briggs conversions like those used on the Luciole (direct drive, ditch the flywheel) MIGHT work.
  16. K

    A new, simple looking Czech(?) single seater

    Marek Ivanov replied to my query: "Desire uses composite Viera wing and tube and riveted alu tube (25x1mm) and fabric Fuselage and tail section. Empty weight with rescue system and Hirth F33 engine 103kg ( 226 lb). The 1st flights was with Bayley 4 stroke 18Hp engine.() It was good but...
  17. K

    A new, simple looking Czech(?) single seater

    They almost raise more questions than they answered! I placed an email to the designer asking for details.
  18. K

    A new, simple looking Czech(?) single seater

    I think it was the other way round? According to https://www.futurevehicles.eu/wp-content/uploads/2020/06/brozura.pdf the Viera was 2007, and the Desire, 2013. I'd love more information on the Desire. It looks like the wing is a D-tube with fabric covering aft of the spar, full span ailerons...
  19. K

    For Sale Craigslist

    Ah, I see now that it is Sierra Vista ARIZONA. There is also a Sierra Vista CALIFORNIA in the Central Valley.
  20. K

    For Sale Craigslist

    It looks like this project once had an engine and a prop. Spinner backplate - not something you're expect on a project that was never completed or flown. I also notice a guide coat sprayed on several parts, a Pro Tip. Also what looks like a giant crack just in front of the vertical stabilizer...
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