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Old 09 April 2010, 13:40   #11
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phillnjack's Avatar
 
Country: UK - England
Town: slough
Boat name: not named yet
Make: Orkney Dory 4 metre
Length: 4m +
Engine: outboard evinrude 60
Join Date: Sep 2009
Posts: 80
Well now come to think of it the above answer is pretty sensible realy.

Is it realy worth doing ?

The drag effect of 5 inches of outboard is not going to be that bad, as its not exactly a
flat or cupped surface.

Most of my use will be playing around on bouncy waves at the coast during the
very hot very long summer we are going to have this year( well i hope so anyway).


what i will do is make a jack plate and test it to see if there is much difference.
If not then ill just simply take it off and go back to long leg.

Buying bits and changing them could be very costly

would need the complete mid section including shaft etc and you dont see
1980's suzi short shaft 30's that often in bit form.

Dont want to sell it due to knowing the full history of the engine.


phill
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Old 12 April 2010, 03:33   #12
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Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
If you just want a bracket and not a jackplate (a jackplate is a hydraulic adjustable bracket) we sell these - it will give you your 5" of lift and we have one in stock!
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 31 January 2013, 17:47   #13
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Country: UK - England
Town: slough
Boat name: not named yet
Make: Orkney Dory 4 metre
Length: 4m +
Engine: outboard evinrude 60
Join Date: Sep 2009
Posts: 80
Sorry its been such a long time since my last post on this subject.
I did make the transom taller by 5 inches and it transformed the boat from running with a longshaft on a short transom.
The steering was improved the splash comming over the back was crazy with it left down too deep.
speed increased from around 18 to 26mph and the boats attitude was also improved greatly.
Time to plane dereased by about 30% as well.
overall the boat was dangerous with it too long,i found steering very hard to keep it under control properly,but like said above its all better now.

What i done was to fit 2 3inch x 3inch lengths of angle to the inside of the transom and fit a board or same thickness as transom directly above the top to raise it up.
This was then covered at the back by a simply piece of ply all over the rear of transom for looks as well as a touch of strength.
overall it worked a treat.
pics below to show what i did.
i no longer have the avon and have now got a rigid orkney dory to give me a touch more room inside.
The avon was a good boat and done exactly what it was designed to do, a very good boat to own if your need a boat that can be packed into the boot of a car and can go anywhere you want it to go.
It wasnt what i would call a dry ride, but very good fun boat and could take a real good pounding that i dont a rigid boat could take without doing damge.
Would i have one again..........yes .

Thanks to those who wrote on this topic,it helped me decide to raise the transom and do a few experiments i would not otherwise have done.

great forum
keep it up (no pun intended)

phill
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Old 01 February 2013, 09:20   #14
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Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
If you want to place a long shaft engine on a short shaft transom the quick way to go would be to get a 5" transom mount so to have engine sitting exactly on top transom and not extending/protruding out if using a external plate. Rising a transom works, but it's time demanding.

Using engine as it is will produce the following : unwanted water splashes at back transom, water could get inside deck at speed, boat will take longer to plane, excesive tail darg on water.

Happy Boating
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