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On Mon, 07 Feb 2005 21:47:17 -0500, Wayne.B wrote:
On 7 Feb 2005 17:17:10 -0800, wrote: One thing you have to deal with is thrust from the propellor and shaft. Car and motorcycle engines and transmissions don't have thrust bearings as in a marine transmission. ================================ There are some other issues such as adequate cooling air, corrosion control and dealing with a dry (hot) exhaust. The speed/torque characteristics are not well matched either, and you would need a substantial reduction ratio. another thought would be to use an impeller, i havent looked at them since uni when we had to calculate the fin angles and other crap{1} but dont they require higher revs/lower torque. to be honest i can barely rember anything about it and cant even visulise the forces{2}, would an impeller need a thrust bearing as for exhaust gases, i may be mistaken but surly any engine will produce them, i know some bike engines have special tuning put exhaust(exup valves etc) but not any i was thinking of do marine engines handle it diferently. i was also thinking of a watercooled engine since the only semi modern engines which arent water cooled are crome crusers which a regard as expensive crap. {1} quite possible the most boring and utimatly pointless class of my life {2} it is 5am and i havent looked at this stuff for 5 years |
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