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Thread: Prop size?

  1. #1
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    Default Prop size?

    New to boats, have a cheaper China abs boat I've been upgrading and completely redid everything from original setup. It's a 800mm with a 150 amp flycolor esc, turningy1650kv 70amp 2600 watt, 3674 motor running a 3/16 flex driven drive setup on 6s. What's a good prop size to start with?

  2. #2
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    A 45 mm wouldn't be too much or could I go bigger

  3. #3
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    You should start smaller, 40-42 mm and test and check and work your way up in prop size.
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  4. #4
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    Apr 2007
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    Cat or mono? Racing or sport running? Exactly what batteries? What is the length of the pond?

    An x440 would probably be quite safe as long as the boat is properly trimmed and not run for more than 2 minutes (use a timer). But we really need more info.


    .
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  5. #5
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    Sport running, vector 80 mono, 2 3s 3000-30c in series.
    I have multiple lakes of good size and a very wide, straight canal long enough to run out of signal

  6. #6
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    I had just got it all done with an sss 3674 1300kv motor running a 40mm prop. Maiden run was gonna tape hatch after a quick cooling check and make sure no water was getting in through the drive. She ran perfect, ballanced but a little slow but safe at full speed n then bam she is stopped at an instant n sunk. Nose up but all submerged, lost hatch. There was a 5 gallon bucket under the water and I found it. Motor is smoking after I dried it out and tested it .everything else is good luckily because everything was brand new (esc, motor and power hd 20 kg digital servo) including complete everhaul of drive system upgrades

  7. #7
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    I'll try the 40 I got n then go up from there. Never got to get results from the sss motor since it lasted all of 30 seconds. Most of that was trimming and making sure she was pissing

  8. #8
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    Still waiting on the cheaper motor and new hatch so needed some new props and wasn't sure how big I can go with the new motor

  9. #9
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    Run Graupner K serie propeller to find the best diameter.

  10. #10
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    Ok thanks, are they a cheaper prop I could get a few different sizes and then get a better quality

  11. #11
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    I have a 38 and a 40 gonna grab a 42 and a 45
    Thanks again everyone, hopefully I'll have better luck this go around

  12. #12
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    I buy some CNC Propellers here, 12 €uros each :

    https://fr.aliexpress.com/item/32852...4c736c37WD6gqr



  13. #13
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    Graupner K carbon propellers are available here at OSE :

    https://www.offshoreelectrics.com/pr...s+Carbon+Props

  14. #14
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    Nice setup, I had previously ordered the cheaper ose brand 38 and 40 I'll try these as well for testing

  15. #15
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    How long does shipping take from AliExpress

  16. #16
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    Quote Originally Posted by Zzoom View Post
    How long does shipping take from AliExpress
    Shipping is fast, no problem. I will order 2 props 38mm 3 blades for my Twin Smash Shark, pitch=1,4.


  17. #17
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    What motors and esc's are you running for these at what voltage

  18. #18
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    What advantages and disadvantages are there between 2 and 3 blade props

  19. #19
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    A 3 blades propeller is better for a heavy boat but the motor must be strong enough and a 3 blades prop is less sensitive to balance.

    A 2 blades prop generaly give more speed. The best is making tests.

    PS : Tenshock make good and strong CNC propellers ,

    http://www.tenshock.com/products/boa...propeller.html

  20. #20
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    Ran the new setup, first 40mm ose prop.
    Ran it slow made sure everything was working and first fast run broke prop. Ran home put on the 42mm graupner ran great had some chine walk. Next day same prop adjusted strut to neutral it was down a bit and ran great temps where Luke warm after a 5 minutes of playing.
    Today tested the cnc 45mm ran great temps where 101 on motor esc 102 and batteries at 107. Loving it running great no chine walk unless I start hitting my wakes need to get a gps and see what kinda speeds she's getting
    Attached Images Attached Images

  21. #21
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    Hit 56 mph today running great on 45mm ran 2 minutes temps at 102 motor n esc batteries 105
    Florida water is getting warm quick lake gotta be close to 80

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