Forum > Power (Large)
Engines
paddlesteamerman1:
Hello All,
Now that I know the SJ cant be steam just at this minute, I need another power option (other than pedal!!)
Dad said that marine diesels are to heavy, and I wouldnt be able to find one small enough, is that true?
And I was thinking of the old green petrol engines, the ones that go bang every now and again!! Would they be suitable, given that the weight is ok?
Thanks
:beer
anth:
there to heavy old and expensive james you should aim for a little air cooled 4 stroke.
paddlesteamerman1:
So just a small air cooled 4 stroke petrol motor should do the job then.. Until I can get my hands on a small steam engine, hopefully it wont through out the whole weight distribution and stability thing we have been discussing..
I will start browsing, but no buying just yet.. not for a while..
:beer
derekwarner_decoy:
Hi PD's & as James says
"I will start browsing, but no buying just yet"
This is a good idea to think about the engine first [or should we say the variations on your considered engines].... a small current vintage air cooled four stroke engine will develop optimum power at say 4000 to 6000 RPM
Just wondering what type/size speed reducer you were now considering to bring your paddle axis revolutions to say 150 RPM :?: - Derek
paddlesteamerman1:
PD's and Derek - I was thinking (as a few have suggested) to have the engine running at bilge level and connect to the drive shaft via a chain.. If that was the case I could lower the RPM from the engine output to the paddles input by making the circumference of the chain circle a lot smaller than the circumference of the drive shafts chain circle.. Kind of like bike gears (but not with multiple gears).. eg.. on the PS Pevensey the engine directly drives a smaller cog which then in turn drives a larger cog and in effect making the paddles RPM a lot smaller/slower than the engines RPM..
Hope that makes sense!!
Any suggestions will be greatly appreciated!!
:beer
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