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Thread: Composite Craft F4s Testing

  1. #51
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    So for roughly 4k you can have a brand new and stronger mid, gearcase and fresh cowlings. The powerheads are reasonable, so the sea-way way is a nice deal.


    Internally the communist mercury is a joke, twisting on those things is going to lead to issues.

  2. #52
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    I dont get why the EPA's around the world have attacked boat racing when they have just about left all other motor sport untouched
    Need to get OMC's old Hong Kong factory running to make race engines.

  3. #53
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    Quote Originally Posted by 45sst45 View Post
    With an educated prop guess by dave dewald we are going 0 to 68 (rev limiter) in 15 to 16 seconds and coming of a 90 degree turn to 68 in 10 seconds. It seems we can go up a bit and turn some more pitch which we will test later this week!
    For 65-69 mph@6200 RPM the right prop can be predicted to be 13x23-24 with 23-24" pitch measured at mid-chord. The leading edges
    will have to be set differently. The predicted correct diameter is large because of the low RPM. The diameter prediction comes from an application of hydrofoil theory to props, scaling down from SE (75 hp, 80 mph@8000 RPM with about the same gear ratio). Given one known case
    as calibration point (SST60, SD, or SJ, eg.), prop diameter for a collection of gearcases with similar lift and drag
    coefficients can be predicted based on shaft hp, RPM, and gear ratio.

    I would expect the F4S boats to be rather easy to blow over. With the heavy motor and short boat, the center of gravity
    will be located much farther behind the center of pressure than for an SST45, SST60, or F1 boat. UIM commissioners
    apparently do not know anything about aerodynamics, and race drivers pay for that with cracked up boats and bodies by following their lead.

  4. #54
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    I think the UIM have done it on purpose just to get BRP to put an e-tec 60 on a sst45 mid and then we will have a proper set up that is current with EPA regs

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