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.
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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