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  1. #1

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    collet, flexshaft size, prop size reccomendation for OS CVR-M .18

    I have a non pull start version, a collet with a pulley for starting with a belt would be nice. I do have a Prather 230 prop. Link me please.

  2. #2

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    Tower Hobbies sells pulleys that work with that engine:
    http://www3.towerhobbies.com/cgi-bin...?&I=LXKKU0&P=7
    http://www3.towerhobbies.com/cgi-bin...?&I=LXRDG9&P=7
    http://www3.towerhobbies.com/cgi-bin...?&I=LXMPN5&P=7
    I bought the first one and it fits perfectly, don't know about the rest.
    As far as collets, I still need to find one myself
    As far as props, that 230 is too large for the engine. Per the specs on the OS .18, a 36 to 40mm diameter with a 1.2 to 1.6 pitch is preferred. The props that fall into this range would be the Octura 1240, X435, 1435, X437, 1437, X440, 1440, Y535, 1540, X637, 1637, X640, 1640, Prather 215 or any of the other manufacturer's props that fall into similar sizes
    Last edited by Hydro Junkie; 05-06-2014 at 03:45 AM.

  3. #3

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    I did some inquiring about collets on another and was rewarded with these:
    http://www.rocketcityracing.com/octu...-coupling-5mm/
    http://www.rocketcityracing.com/aero...hreaded-x-187/

  4. #4

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    Thanks for the links. It helped.

  5. #5
    Ron Olson's Avatar
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    An O.S. 1-D flywheel will work also but the others are also good choices.
    Yes, the Prather 230 is way too large, the 215 or 220 would be better or the Octura props listed. The X-637 would be really close to the right one.
    IMPBA 17238 S
    269 Racing Team

  6. #6
    amax's Avatar
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    Prop Size is Dependant on Hull Style, Weight, Nitro %, and Engine Mods/ or Stock.

    I would recommend a .150 Flex Shaft with .1875(3\16") Stub Shaft. And the Octura Flex Hex Coupler (Collet)

    The aluminum flywheel should work Ok it will give you Higher RPM's and Quicker Revving, But if you have problems turning props go with a Heavier flywheel Like Brass.
    Top Speed Hobbies llc. Gotta Need For Speed..
    www.youtube.com/user/topspeedhobbies

  7. #7

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    Cool guys. Thanks for the info, that is what I was looking for.


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