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Author Topic: PADDLEWHEEL RPM ?  (Read 232 times)

Offline Robert Hornby

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PADDLEWHEEL RPM ?
« on: October 08, 2021, 02:28:42 PM »
I have finished my model of my interpretation of what the engine room of the ferry General Gordon may have looked like. It was intended to be a fully working model driven by compressed air. However I cannot got it to run and the reason I believe is a lack of flywheel inertia. In real life the paddle wheels would have been heavy enough to act as the flywheel but weight cannot be scaled for a model hence the conundrum.
So I am changing tack completely and will drive it via an electric motor from below. My question is am I close to thinking that 60 RPM for the paddle wheel will be about right ?

Age and treachery will always overcome youth and skill

Offline Hankwilliams

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Re: PADDLEWHEEL RPM ?
« Reply #1 on: October 10, 2021, 05:19:14 AM »
To write anything substantial about your problem I need some dimensions: What`s the diameter of the wheel and what`s bore and stroke of the engine? Is the engine running well, if wheel is out of water? How strong was the pressure? For example my own experience: For direct driving paddlewheel of diameter of 150 mm, one needs an engine stroke of ca. 35  mm.

Thomas

Offline Robert Hornby

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Re: PADDLEWHEEL RPM ?
« Reply #2 on: October 10, 2021, 04:50:50 PM »
Thanks Hank, My model will not be going in a boat, it is just a stand alone model of an engine room and drive mechanism to the paddle. It will never see water.
So my simple question is " Is 60 rpm for the paddle wheel about right to look OK. ?
I need to work out the gearing and chose a slow motor, but that will not be a problem.
Bob
Age and treachery will always overcome youth and skill

 

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