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Old 08 May 2011, 16:15   #21
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
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Quote:
Originally Posted by Hightower View Post
Quite possibly!

However after I started adding weight the performance of the 21" dropped down to 35kn's and started to bog down when accelerating. It was funny as WOT didn't seem to reduce with the speed, indicating more slip was to blame. I clawed the speed and acceleration back with that 19" viper you found for me on ebay and it added 250 rpm to the WOT which is now midrange at 5000 rpm.
I've found the same thing. My WOT RPM stays the same to within a whisker,but the slip % changes depending on weight/weather.

I'd love to try the boat 'bare' with just me and one tank aboard-I suspect I'd make 40 knots.
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Old 08 May 2011, 16:30   #22
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Country: UK - England
Town: Northampton
Make: RibTec
Length: 5m +
Engine: Outbaord mariner 75
Join Date: Apr 2011
Posts: 506
Hi
I Get about 39-40 knt wot=5300 ribteck 5.35 75 2 Stroke 17" pitch prop 2 full tanks.and just me.

is that good?

or should i get more?
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Old 08 May 2011, 16:48   #23
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Country: UK - England
Town: Southampton
Make: Ballistic
Length: 7m +
Engine: Yam 225
Join Date: Jun 2010
Posts: 978
Quote:
Originally Posted by gotchiguy View Post
I think we all know the real reason why he's selling up!
you do nothing to further you cause of promoting the brand, you just look daft.
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