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    New engine for Sonex.

    Aviacs--good questions. I really will have no idea about actual engine RPM's until I actually try it. Everything is really related to prop RPM's and pitch rather than engine RPM's--I HOPE the engine speeds, via the transmission, will be easily adaptable to the needed prop RPM's. I have flown...
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    New engine for Sonex.

    Re Honda output shaft. I am NOT mounting my prop to it. The engine shaft neither carries nor is subjected to any prop loads. As to the engine output, again the only thing the engine is handling is torque, with some side loads as it is delivering power to a belt rather than a shaft. I think...
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    N994SP Gets High!

    Some of the most beautiful pictures ever of the Mt. St. Helens area. I was in California when it blew, and flew US Forestry Air Attack years later for the fires around it. This is unbelievably beautiful country, winter or summer. I envy you being able to fly around it now. Thanks for sharing...
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    New engine for Sonex.

    Actually, they are in the bearings. It is the strength of the shaft that might be affected, which is why the VW engine is really a kinda skeptical engine for aircraft. If you get a hard prop strike, even with a wood prop, you have the probability of bending the shaft. That will lead to...
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    New engine for Sonex.

    Not planning on it, Danman, tho I might possibly. That would be a rather heavy addition. The forces that the shaft will be subjected to by the belt are rotational and torsional. torsional is what the shaft is designed for, of course, and the rotational forces are also of a sideload type that is...
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    New engine for Sonex.

    Your computations reflect my thinking. With this kind of torque, I would be able to turn my very coarse prop at the power to give me good takeoff performance, and with shifting gears, I would also be able to utilize that coarse pitch for high speeds. All my work, WHICH IS MINIMAL since the...
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    New engine for Sonex.

    This is a nice experiment, and should work. BUT, it is still a "rare" engine, and a one-off that would be difficult to achieve, AND it has none of the many-years-of-engineering-work that I am after. I want an engine that is totally reliable, has been the object of over 20 years of engineering...
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    New engine for Sonex.

    We'll see. The only thing that can really happen is that it won't work as I envision. But, I have been around aircraft for about 55 years now, as an A&P, and this is something that I am basically fiddling with, and making one of the most completely engineered engine SIMPLY into something that...
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    New engine for Sonex.

    WOW,, Talk about Reverse-Engineering! Is that experimental, or a new BMW product? If it is a product, it is a huge advance for Rotax, because that is a whole lot better experimental database platform than aircraft ever will be. ------ Just as a curiosity thing, a good buddy of mine, Ron...
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    New engine for Sonex.

    Another thing about my engine. Virtually all the AIRCRAFT engines have to turn at around 2,000-3,000 rpm, in order to have reasonable prop tip speeds. Very few piston engines produce any power at those RPM's. The Rotax/Jabaru engines solve that problem partially with gearing, but----they...
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    New engine for Sonex.

    Sorry for the confusion, Aviacs, I should have done a better job of my "editing." The engine is out of a Honda ST-1300, not 1600. It is the V-4. And your comments about torsional stress are exactly why I am going to the Dynafocal belt for a final drive. That is the belt that drag racers use...
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    1.5

    FOR SALE 1.5 hr SCMOH Volkswagon engine conversion for the Sonex. This engine was completely rebuilt by a very good Volkswagon overhaul shop just 1.5 running hours ago. It was in the Sonex that I purchased, was removed because I am working on a new engine for installation in the Sonex. It...
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    New engine for Sonex.

    NO SIR! Aside from a new induction manifold (needed to clear the prop shaft adapter) and new exhaust pipes, I have made NO changes to the engine AT ALL. I wanted to preserve the integrity of the original engine. I am not the hundreds of engineers who have developed this engine over the years...
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    New engine for Sonex.

    I am adapting a new engine for my Sonex. It is the most thoroughly engineered engine ever built in this world, puts out about 125 hp, is still being produced, is simple, water cooled, and available everywhere in the world. I am making absolutely NO changes to the engine at all, just installing...
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