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Old 26 May 2013, 20:07   #21
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Country: UK - Scotland
Make: Destroyer 5.5/Ring18
Length: 3m +
Engine: Yam 90HP/Yam200HP
Join Date: Jul 2009
Posts: 447
I ended up with a Yam 75hp 2stroke oil injection.
A new 2 man console supplied and fitted by Whitham glass fibre with a 91 litre fuel tank fibre glassed in place.

The engine I offset 2 inches and lifted it up 2 holes, there is no chine walking and it does a GPS verified 44mph with stainless prop.
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Old 19 August 2013, 04:56   #22
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Country: Finland
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Boat name: Helena II / Avon
Make: Prestige Brio,SR 4.7
Length: 4m +
Engine: Yamaha F25 & 90/2S
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Posts: 16
Why the offset ?

Hi,

as a new member to the forum and an new owner of my first Searider which I am slowly sorting out I wonder about the engine offset. I guess it is to counteract the propeller rotation ? How do I calculate the offset ?
The previous owner has installed the engine in the dead middle and I get a fair amount of chinewalk at full throttle. Standard aluminum 21 inch gives 42 - 43 knots, SS 19 Ballistic 41 + knots but I think I need to raise the engine with the Ballistic ?
The boat is a 4.7 SR with a Yamaha 90 AETOL, and yes I know it is at the upper limit of approved power .
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Old 19 August 2013, 16:47   #23
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Country: UK - Scotland
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Make: Birchwood
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Engine: Inboard Diesel 250hp
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Very general rule of thumb is 1.5" per 100hp offset to starboard for rh prop. Depends on speed hull and prop etc. hope this helps
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Old 21 August 2013, 08:36   #24
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Thanks !
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Old 21 August 2013, 17:21   #25
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Quote:
Originally Posted by Kat1nka View Post
The boat is a 4.7 SR with a Yamaha 90 AETOL, and yes I know it is nearly 30% over the upper limit of approved power .
Fixed

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Old 22 August 2013, 08:49   #26
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Country: UK - Wales
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Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
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Yazmm 90

did you beaf up the transom or support struts?
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Old 22 August 2013, 16:14   #27
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Country: Finland
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Boat name: Helena II / Avon
Make: Prestige Brio,SR 4.7
Length: 4m +
Engine: Yamaha F25 & 90/2S
Join Date: Aug 2013
Posts: 16
No beefing up (yet). The 90 hp was already installed when I bought the boat. But I understand from other threads that it is the same transom as in the 5.4 which is rated for 90 hp. The weight is in the limits .
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Old 22 August 2013, 20:34   #28
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
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Originally Posted by Kat1nka View Post
The weight is in the limits .
The HP isn't though. Max 70hp... Your insurance might laugh if you have to claim.
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Old 23 August 2013, 13:31   #29
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Quote:
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no beefing up (yet). The 90 hp was already installed when i bought the boat. But i understand from other threads that it is the same transom as in the 5.4 which is rated for 90 hp. The weight is in the limits .

okey dokey
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