Moderated Discussion Areas
ContinuousWave: Whaler Performance
slippage under 2%?
|Author||Topic: slippage under 2%?|
posted 07-07-2004 07:46 AM ET (US)
yesterday i raised the engines (they were too low making a very big spray and needing to be always trimmed out very much), so today, quite calm sea and a little bit of free time from my job, i had a ride to test the new arrangement...
I was alone on board, with 50 gal of gas.
putting all the data in the prop calculator this should put the slip value at 1,61% (gear ratio 1.87)...
at 3700 rpm, the speed was 30knots (----> slip 3%)
1) the laser II props, running just under water surface, are actually a little bit more pitched of 19
2) the smart craft digital gauges are not so accurate (both them?)
3) this morning i found the perfect engine-boat-trim-weight combination!
what do u think about?
posted 07-07-2004 09:19 AM ET (US)
It seems pretty common for stainless props to show very little slippage when using the prop calculator. My 16" Vengeance gets as low as 0% at some speeds.
Of course, that doesn't really mean the prop has no slippage, it just means that what I'll call the "effective pitch" of the prop is somewhat greater than the listed pitch, perhaps due to the cupping, blade shape/twist, or other factors.
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