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  1. #1

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    prather to octura prop conversion

    I was wondering if there was some sort of conversion between octura and prather props. My boat has recommended prather props but my local hobby store only carries octura. Also if you guys had any quick explanations about what the numbers mean. Thanks

  2. #2
    Ron Olson's Avatar
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    RE: prather to octura prop conversion

    Octura is pretty easy to figure out if you know the metric system. The first number after the "X" is 1.x (4, 5, 6, etc.) is the pitch in millimeters. The last 2 numbers is the diameter in millimeters. Prather is more difficult because they just use a numbering system based on size.
    If you want to, PM me your name and address and I'll send you a copy that I have of a really good prop chart. It has Octura, Prather and ABC props listed with the diameter and pitch in both SAE and metric, MPH at RPM levels figuring in a 15% slippage factor.
    IMPBA 17238 S
    269 Racing Team

  3. #3

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    RE: prather to octura prop conversion

    hey ron could i get that chart 2 thanks

  4. #4

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    RE: prather to octura prop conversion

    if you dont want 2 send me the chart just post the conversion from prather b230 to octura thanx

  5. #5
    Ron Olson's Avatar
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    RE: prather to octura prop conversion

    I've already had requests for the chart. I'll get more printed up tomorrow. I will do a limited amount so get them in to me by a Private Message.
    The Prather 235 measurement is 2.36" dia. and 3.20" pitch. The closest Octura which is slightly smaller is the X-457/3 at 2.24" dia. and 3.14" pitch, still in my opinion a lot of prop for a .32 . The largest prop that I turn on my .45's is an Octura X-450/3.
    IMPBA 17238 S
    269 Racing Team

  6. #6

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    RE: prather to octura prop conversion

    Maybe this will help someone........

    PROP USAGE CHART
    Inboard Deep Vees: Scale Hydro:
    3.5cc - 215 - 220 11cc - 245 - 250 - 255
    7.5cc - 230 - 235
    11cc - 245 - 250 - 255 Prop # Diameter Pitch
    15cc - 255 - 260 - 265 Engine Size 215 1.60" 2.5"
    3.5cc - .21 220 1.72" 2.6"
    Outboard Deep Vees: 7.5cc - .45 225 1.84" 2.8"
    3.5cc - 215 - 220 11cc - .67 230 1.90" 3.0"
    7.5cc - 230 - 235 15cc - .90 235 2.00" 3.2"
    11cc - 240 - 245 240 2.12" 3.3"
    245 2.25" 3.5"
    Inboard Outrigger Hydro: 250 2.30" 3.6"
    3.5cc - 220 - 225 - 230 255 2.40" 3.8"
    7.5cc - 240 - 245 - 250 260 2.52" 3.9"
    11cc - 255 - 260 - 265 265 2.61" 4.0"
    15cc- 265-270 270 2.74" 4.2"

  7. #7
    DMACK's Avatar
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    RE: prather to octura prop conversion

    Here's another pretty complete list.
    Attached Files Attached Files
    Power in the hands of the few!


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