Connect engine to propshaft (RC Boat project)
Connect engine to propshaft (RC Boat project)
(OP)
Hi, got my hands on a sc32 engine which are originally for planes. Im trying to fit it into a rc boat, i can manage to get it to fit all the servos (electrical) etc. Basically i want to know what the best approach would be to connect the boat propshaft to the engine, the engine has a 1/4 unf thread which originally was for a propeller to be bolted on. The boat propshaft is thin bar i dont know the size as i have nothing to measure it with but originally the propshaft was powered by a cog from the electric motor connecting to the propshaft. How can i connect the propshaft to the engine? thanks
I have attached a few photos. the engine, the propshaft and what i would like to achieve.
I have attached a few photos. the engine, the propshaft and what i would like to achieve.





RE: Connect engine to propshaft (RC Boat project)
Cheers
Greg Locock
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RE: Connect engine to propshaft (RC Boat project)
RE: Connect engine to propshaft (RC Boat project)
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Connect engine to propshaft (RC Boat project)
RE: Connect engine to propshaft (RC Boat project)
What RPM will this be running when you're done? Spinning a thin bar of any length at (for example) 10,000 rpm will probably indicate the need for prop-shaft supports.
Apologies in advance if this is something that you've already considered and accounted for.
RE: Connect engine to propshaft (RC Boat project)
Worst case the plastic part fails and you have a design to replicate in metal?
RE: Connect engine to propshaft (RC Boat project)
Maui
www.EngineeringMetallurgy.com
RE: Connect engine to propshaft (RC Boat project)
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Connect engine to propshaft (RC Boat project)
Go here for RC Boat information Nitro, Gasoline and Electric http://gallery.intlwaters.com/thumbnails.php?album...
Go here for RC Boat Electric ONLY http://forums.offshoreelectrics.com/content.php
Mike Caruso
RE: Connect engine to propshaft (RC Boat project)
What speed do you anticipate having to stay under to prevent cavitation? Or, reversing the problem if you are assuming a fully cavitating prop, what speed is the engine and what is the optimum prop speed?
Do you anticipate vibration problems in either?
Any significant Sealing problems between prop shaft and hull? (Sorry, its the submariner in me getting all technical here, but water getting in the boat doesn't make me comfortable ...)
Could you simply clamp a hollow rubber tube between the motor shaft and prop shaft?
RE: Connect engine to propshaft (RC Boat project)
I saw this in another hobby application with an electric motor, and a piece of all thread to make a linier mover.
I doubt you can use windshield fluid tubing, but you would not need to srink that.