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Thread: 45mm Props NEED HELP

  1. #1
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    Default 45mm Props NEED HELP

    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??
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  2. #2
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    I believe I found the prop somewhere and it says rise 54mm not sure if that helps.
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  3. #3
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    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.
    Mini Cat Racing USA
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    Quote Originally Posted by sailr View Post
    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.
    You think I should test them under load of pushing something or test without first then test while pushing or pulling a boat.
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  5. #5
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    Any thoughts on how many amps you think I will be pulling?
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  6. #6
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    Jeff, what are you planning to use as a rig on it to hook the boats to it??
    too much power not in the FE racing dictionary

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    Quote Originally Posted by U1Racing View Post
    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.
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  8. #8
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    Not sure how you would test other than on a boat! Any other test would be inconclusive.

    Quote Originally Posted by monojeff View Post
    Yeah I think your right on that 62-64mm pitch from what I could gather.
    You think I should test them under load of pushing something or test without first then test while pushing or pulling a boat.
    Mini Cat Racing USA
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  9. #9
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    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.

  10. #10
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    You could always run them through a gear box which will decrease rpm and increase torque.
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