hoog76 Posted January 19, 2005 Share Posted January 19, 2005 I've been reading many websites about cozys for a few years now. This has got to be one of the best resources yet. I'm very ignorant when it comes to the details of hp, thrust, props, rpms etc so bear with me if this seems extreme. One of my biggest interests beside a glass cockpit is engines. What I'm confused about is the requirement for larger hp engines. Isn't the main goal to get the prop turning at a specific rpm for maximum thrust? So wouldn't a prop driven by a 60 hp engine turning at 2400 rpm give the same thrust as a prop turning at 2400 rpm by a 200 hp engine? Is a larger hp required since turning a prop at x rpm's has to much resistance for lower hp engines? Would a different prop design with a smaller hp engine work to create the same thrust as a larger hp with a less efficient prop design or would the resistance of the prop be too much for a lower hp engine? Like I said, my knowledge is really limited and I see the formulas shooting across but it might as well be in a foreign language. The reason that I ask is because I'm really interested in diesels. I see a lot of smaller air cooled diesel engines in the 30-60 hp range. Kohler, honda, ford, cat, deere, BS, etc. The engines are fairly low cost,light weight and have a high mtbf. Most have peak power at the 2200-3000 rpm range and could be direct drive. Some of the engines are small enough that it seems that if you could take through clutches or one way gears and combine the power of two engines to a single prop it would also provide some redundancy if one engine were to develop problems. I'm not suggesting to throw lawnmower engines into a cozy but engines that are designed for long term mid range use. Seems that most of the issues/failures and costs are associated with complex engine setups that are in a lot of cases unproven and untested. Just curious as to what the thoughts are about my ramblings. Thanks, Hoog Quote Link to comment Share on other sites More sharing options...
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