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13 x 13 RH

May 21 2007 at 9:42 AM
Paul  (no login)

Response to Prop

Hi Rickard,

I'm not sure what prop is the factory spec, but a 13 x 13 was in the boat at the time it arrived here in Nashville. The HF7D Paragon is a direct drive unit, so the rpm of the prop would be the same as the engine speed. With 210-hp and a 13 x 13 spinning at 4000 rpm that equates to an unrealistic 49-mph in theory without slippage, take out 15% slippage for this particular deep v hull and that results in a realistic 41-mph speed with that prop.

Factory speed ratings were published at 38-mph with the 210-hp 327F and 36-mph with the 283 185-hp. Since this boat has a higher compression block than the original 8.0:1 of the stock 327F and the minimum power for that compression was 250-hp, I also have a cupped 13 x 14 speed prop I'm going to try. I think it's possible to get a little more speed, but clearly this is not a speed hull due to the deep V, it's a soft ride hull. Because of the additional wetted area of a deep v compared to a generally flat bottom design, the deep v always takes more power to reach a given speed (increased drag). I don't know the true power of this boat due to the fact that it has a higher compression automotive block. If power is in the 250-hp range, I may be able to exceed 45-mph with that 13 x 14 cupped prop. Otherwise it may just serve as a comfortable mid range cruising prop. For water skiing I'll probably stick with the 13 x 13.

The interesting thing is, a deep v is frequently the faster boat because of conditions. In anything more than a mild chop, my 1950s speedboats have to throttle down or pound. In conditions like this a deep v will just blast right on by.

If you can give me the weight, power, gear reduction, and prop, I'll run some calculations for you just to see what they say.


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