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Old 13 September 2006, 19:19   #21
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,851
Originally Posted by Colin F
yes we did get some results......

top speed was increased by 2 knots on the middle jumper setting. Acceleration was noticeabley improved but no figures to prove it. As a guideline, acceleration was the same as torbay harbour patrol boat (same rib, heavier kit on board though)which has a 225 honda and a S/S prop, up to 20 knots, then they pulled away. Mine still on ali prop and still under revving by 300 - 400 rpm.

Ps thanks to 'Bluestreak' for fitting it for me
Colin, am I sensing a bit of disappointment?

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Old 14 September 2006, 13:31   #22
Country: UK - England
Town: Torbay
Boat name: Marlin
Make: PBS humber 5.5
Length: 5m +
Engine: 115 optimax!!
Join Date: Jul 2003
Posts: 350
Originally Posted by jwalker
Colin, am I sensing a bit of disappointment?
I'm not sure what i expected really. I did have look for some old data I remember seeing that fletcher used to publish showing top speed with different outboards. I seem not remember not much top end improvement for a fair amount of hp, but I'm not sure if I remember it correctly. The acceleration improvement is good, the top end a little disappointing I suppose. Do you think the ally prop may be a limiting factor?

I will be happier with a S/S prop and a clean hull, to then see what it does in comparrison with the other 6.5's round here that have 175 & 225 honda's on.

Colin F is offline   Reply With Quote
Old 14 September 2006, 13:58   #23
Country: Norway
Town: Farstad
Boat name: Searafting
Make: Humber Offshore 8,5
Length: 8m +
Engine: 2 x 250 Suzuki
Join Date: Jul 2004
Posts: 68
Try they have chip for both mercruiser and the volvo d engines.

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