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They are graupner 45mm counter rotating props which are going to be pushing a twin 550 brushed 32" mono which I will be using as a retrieval boat.
The motors are proboat apache 550s.
I am not sure what the pitch is on the props but it says hydro on them which I did not realize when I got them.
Can I possibly cut them down or should I get new props??
I believe I found the prop somewhere and it says rise 54mm not sure if that helps.
They are most likely 63 or 64mm pitch. If I were you I'd go ahead and try them. Run for about 45 seconds and then bring boat in and check temps. If too hot, get smaller props.
Yeah I think your right on that 62-64mm pitch from what I could gather.Quote:
Originally Posted by sailr
You think I should test them under load of pushing something or test without first then test while pushing or pulling a boat.
Any thoughts on how many amps you think I will be pulling?
Jeff, what are you planning to use as a rig on it to hook the boats to it??
I plan to make some sort of arms on the front of the boat to push them back to shore.Quote:
Originally Posted by U1Racing
Not sure how you would test other than on a boat! Any other test would be inconclusive.
Quote:
Originally Posted by monojeff
If it is a rescue, speed shouldn't be a problem, you could lower the cell count or something in order to bring rpm's down, propping then wouldn't be a problem.
You could always run them through a gear box which will decrease rpm and increase torque.