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Old 27 July 2015, 10:01   #1
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Country: UK - England
Town: London
Boat name: Anon
Make: Avon: Rover R3-40
Length: 3m +
Engine: 6 HP Mariner
Join Date: Jul 2015
Posts: 3
Advice Please on Avon R340 Transom Height

Hello All,

New member here, hoping some of the old hands can cast an eye.

I have very recently bought an old Avon R3-40. I have a Mariner 6HP Long Shaft (from my other, larger boat). So, unsurprisingly my query is about the height of the transom.

I have had a bit of a nose about prior to posting, and have read the informative link below.

ABC Sib-Rib Installation Guidelines.-

Also I have had a look at the very specific thread below, which seems to feature an Avon similar to mine. Which shows a very effective raising of the the transom by phillnjack.

Raising - extending transom height.

I have also attached images of my boat, with a makeshift set up and from what I can very roughly judge, my transom is more or less the same height currently, as shown in the modified transom link of phillnjack's above.

I would be most grateful if the experienced members of the forum could have a look at the images below and give me their thoughts on the if the current height of my transom, is fit for purpose?

All help much appreciated.
Attached Thumbnails
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ID:	107471   Click image for larger version

Name:	Transom 2.jpg
Views:	89
Size:	164.6 KB
ID:	107472  
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Old 27 July 2015, 13:46   #2
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Country: UK - England
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Boat name: Wine Down
Make: Maxum
Length: 8m +
Engine: Inboard
Join Date: Apr 2012
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You have a short shaft transom (15") and a long shaft engine (20")

While it will push the boat along (Assuming it starts with the increased back pressure on the exhaust), its not ideal.

The extra drag will probably stop any chance of you getting the boat on the plane.
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Old 27 July 2015, 13:56   #3
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Country: UK - England
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Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
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As he said - it will 'move' the boat but will it be right? Nope!
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Old 27 July 2015, 14:06   #4
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Country: UK - England
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Boat name: Anon
Make: Avon: Rover R3-40
Length: 3m +
Engine: 6 HP Mariner
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Thanks for your input Gents.

How much higher should I be looking to raise the transom? About 3" The same height again as the steel outboard plate that is there already?
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Old 27 July 2015, 14:19   #5
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Country: UK - Scotland
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Make: Ribcraft 6.8
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had similar thing not long ago, the only way to do that correctly is get a different engine.

you would need to raise the engine 5" from where it is now, it will literally be in mid-air.

you will never plane with that engine anyway, so i'd just live with it as i assume it is to potter around.

cheers
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Old 27 July 2015, 14:36   #6
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Country: UK - England
Town: London
Boat name: Anon
Make: Avon: Rover R3-40
Length: 3m +
Engine: 6 HP Mariner
Join Date: Jul 2015
Posts: 3
Thanks for that.

If it's possible to potter with the current set up, I'll probably go with that, it's only 6hp.

For now it's just about getting out on the water for a bit, before the summer(ish) time passes.
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