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Old 20 July 2005, 10:15   #21
Richard B's Avatar
Country: UK - England
Town: Berkshire and Devon
Make: Lodestar
Length: under 3m
Engine: Mercury 5hp
Join Date: Jul 2002
Posts: 5,015
Originally Posted by qcamel
I think the point being made is that if you move the engine backward to find cleaner water then you would need to move it back more than a couple of inches to have any effect...

If you have 10" setback, then the areated water will be hitting the prop 0.01234 seconds later at 40kts. Now travel behind any boat at 40kts and see how long the water remains disturbed and areated for. I'm not convinced that the setback will make a tangible difference, even at 4kts, but I could be wrong. Naval Architect or Fluids Dynamics Engineer please!

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Old 21 July 2005, 05:00   #22
Country: UK - England
Town: Southampton
Boat name: Searider / War Shot
Make: Avon / Scorpion
Length: 4m +
Engine: 30hp Yam / 150hp opt
Join Date: Sep 2003
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Perhaps setback has the virtual effect of placing the propeller in "deeper" water? Once the water leaves the running surface of the hull it starts to rise again?

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Old 21 July 2005, 10:14   #23
gtflash's Avatar
Country: UK - England
Town: southampton
Boat name: TOP CAT 2
Make: Scorpion 8.1
Length: 8m +
Engine: 250hp HO
Join Date: Aug 2003
Posts: 1,191
ive got a stepped hull boat too, and it does slip easier than a non stepped boat, i remember graham struggling with tickeld pink (i was the other guy that u beat to buy her!!) could be worth mailing johnny fuller or someone off boatmad if ur solas prop dont work, i thought setback was more to alter c of g but if you can lower the motor into cleaner water at same time then great, i fitted a high 5 to get more grip and it worked a treat.. but i can still only use about half my trim range


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