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Old 25 November 2009, 15:46   #1
Country: UK - England
Town: Fareham
Make: Avon Adventure
Length: 5m +
Engine: Merc 90
Join Date: Aug 2009
Posts: 91
Reserve engine short shaft or long?

Hi, I am thinking of getting something like a 4hp reserve for my Avon 560 Rib, if I use a reserve bracket should I go for a long or short shaft? or I guess you would put the bracket
on to suit

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Old 25 November 2009, 17:45   #2
Country: UK - England
Town: Bucks
Boat name: Spare Rib
Make: Zodiac/Bombard
Length: 6m +
Engine: 90hp Yamaha
Join Date: Feb 2003
Posts: 157
If it's a fixed bracket, you'll probably need long shaft (if the main engine is long) because it will be mounted at the same height as the main engine. If you fit a lifting bracket, you will probably get away with a short. That also has the advantage it will be higher out of the water (at full up tilt) when not being used.

Tim Spring
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Old 27 November 2009, 14:24   #3
m chappelow's Avatar
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
dont forget you are not going to get on the plane so when in use it will be probely at slow displacement speeds ,in choppy or lumpy waves the prop might be airborne causing you to loose power at times if using a short shaft and its not mounted low enough; we once had to assist a guy back in with an aux short shaft engine mounted on a rib transom , there was plenty of power but the prop kept popping up in the waves which made a for a slow return back to port ,,it was ok around the harbour in the flat water but when he needed it it was 3steps forward 2 steps back ,
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