Well, maybe. When the engines we're flying were developed, concepts like "tumble" and "flame propagation speed" were much less in their mind than "head temperatures" and "vibration". A high tumble, fast burn head, with good squish area would go a long, long way to raising BSFC. And they'd be essentially free. A high pressure oiling system, with full flow oil filtration would help. RPM are low... so it might not help, but you could go with dual cam in block, for better pushrod angles and more accurate valve timing. A girdle to allow the cylinders to support each other would be good. Or.. shock and horror, cylinders that are part of the block. And single piece heads. One of the keys to modern car reliability, is the reduction in parts.That would be the cat's meow, but you'd have to sell a lot of engines to keep unit price within reason, even if manufacturing costs were rock bottom. An engineer once told me it took millions of man-lifetimes to develop the automobile engine.
Lycoming beat you to it. Quite some time ago, even.A girdle to allow the cylinders to support each other would be good. Or.. shock and horror, cylinders that are part of the block. And single piece heads. One of the keys to modern car reliability, is the reduction in parts.
Time, is money too. It's important to remember that. You're paying one way, or another. Greg's sending you updates, because he's investing the time (read money...) every day. The cost of airplanes is relatively small in materials, as they're light.I asked Greg and he says he has $300 in materials so far in his VJ-23 lattice wing hybrid... he's one busy beaver, flooding me with pictures every day. *snip* Building static things that just don't do anything at all until the end, which could be years off, doesn't much thrill me.
Anyway, sorry to interrupt you guys, you were talking about cheap airplanes being impossible or something like that... haven't been following along...
I would like to learn more about the design of the “X box frame instead of [a] spar.”VJ-23 hybrid glider using X box frame instead of spar. The fuselage is a sandwich of wood and styrofoam. Underneath, Lightweight transportation trailer built for it (green speed square sitting on it). Chopper IV tail rudder in background (Horse on it) - a Beujon Hybrid. Greg hates alluminum - he says it costs too much.
I asked Greg and he says he has $300 in materials so far in his VJ-23 lattice wing hybrid... he's one busy beaver, flooding me with pictures every day.
Have you scratch built one individual airplane for yourself from start to finish? You may want to consider it because that in itself is a monumental task and will be a good education in it's own right.I'm hoping to make my Hurricane a kit. Initially, it was a 'me' project. But large amounts of monocoque heat formed from 8x4 or 10x5 sheets of inexpensive material has made me bold. Designing as a kit has really slowed down design, though. I'm spending a lot of time trying to make it easier and cheaper to build. Just building it would be quicker...
Even with a Rotax 503 Chuck's excellent center line thrust machine is below 250lb empty for a gyrocopter with no bad habits!!