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Old 07 December 2008, 08:17   #11
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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
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Looking at the specs for the 5.4 compared to the 4.7 I get the impression the 4.7 is the same boat as the 5.4 but using a shortened mould. The Honda might not be ideal as it's bloody heavy, but I doubt you'll have any structural problems.

4.7 Specs:-



5.4 Specs:-

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Old 08 December 2008, 12:56   #12
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Country: UK - Scotland
Town: montrose
Boat name: rib tickler
Make: Tornado
Length: 5m +
Engine: 150hp Optimax V6
Join Date: Apr 2007
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Got an email back from Avon.....

There is a maximum 70hp for the SR4.7m Searider.
The maximum transom weight would depend on
if it is a long or ultra long shaft.

The long shaft is standard for this boat.

Maximum Transom weight
Long shaft 130kg
Ultra long shaft 150kg

Has anyone got anything to add now with this info? Considering the engine is a long shaft and weighs 163kg.
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Old 08 December 2008, 13:14   #13
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Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
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AS NOS pointed out the avon is a strong boat and the weight is unlikely to cause any structural problems, and the power of the engine isnt excessive,
however they were designed for twostrokes and i would say the handling wouldnt be exactly as avon designed with 163 Kgs on the back.
maybe if you compenate by moving other weight such as fuel tanks forward it will sort out the handling, but keeping an insurance company happy in the event of a claim is another matter, and this would be a major concern if it were mine.
If you can get your insurance company to cover it, and get it in writing after explaining its X% overweight and X% overpowered, once your used to the different handling i cant see it being a problem.
someone else may know different?
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Old 08 December 2008, 13:38   #14
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Doggypaddle is right, to me this set up is way to heavy, also the insurance would be totally null and void, as your carrying divers etc this really should be a major factor in your next decision, i wouldnt put a 90 f/s on a 5.4 as its on the limits, definately not on a 4.7,
Avon have already said you have exceeded the hp, really you need to change the engine or not buy it what ever,
Tohatsu 60 /70 or Yam 70 would be ideal
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Old 08 December 2008, 15:43   #15
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I think its far to heavy, you will have so much water coming over the transom as it will have almost no freeboard (when sitting in the waater not underway) Also the engine could suffer if its sitting deep in the water. I think you also might have problems if your in a heavy sea as the boat will be so heavy at the back.
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Old 08 December 2008, 19:23   #16
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Country: UK - Wales
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Make: Vipermax 5.8, SR4.7
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Quote:
Originally Posted by matt h View Post
Tohatsu 60 /70 or Yam 70 would be ideal
Agreed
.
or a Soozook DT65
.
.
.
A mate of mine did have one with a Yam 90...........
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Old 09 December 2008, 04:13   #17
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Country: UK - Scotland
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Boat name: rib tickler
Make: Tornado
Length: 5m +
Engine: 150hp Optimax V6
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Thanks for all the responses guys.

I still have my Suzuki DT75 and I think the starting problem was a bad negative battery lead as we found this when replacing the engine with the Honda. I think given the advice from forum members I will put the Suzuki back on. I have had the gearbox repaired and I now have a spare as well.

Anyone want to buy a Honda BF75 F/S 2002 complete with controls and new prop?:-)


PS. I take it the extra 5HP of the Suzuki over what Avon recommend will not cause any problems....will it?
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Old 09 December 2008, 04:37   #18
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Nah it'll be fine.
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