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Old 11 July 2019, 18:44   #1
Country: Ireland
Boat name: tbc
Make: humber
Length: 6m +
Engine: outboard yamaha 115
Join Date: Jul 2019
Posts: 1
Aux outboard

Just purchased a new new humber destroyer 6.0m. Looking to fit an auxilliary outboard. Will a standard long shaft (20" transom height) do the job or will I need an adjustable bracket.main engine is yamaha 115
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Old 11 July 2019, 20:26   #2
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willk's Avatar
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,627
Welcome to RIBnet Shannon.

It will depend a little on the actual transom Humber gave you. There's a good chance a 20" will be fine. Most small motors have a 2" bracket, so first thing to do is get a calipers on your transom and see how thick it is. After that, work out where the aux motor can sit without interfering with the turn range of the main motor. At that point, drop a tape vertically to the bottom of the transom - that's the magic height. Most small engines have a leg length of circa 17-18" and you might just get away with one - depends. You'll need the prop to clear the bottom of the hull.
I'm sorry, but there IS no Mars Bar.
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Old 11 July 2019, 22:39   #3
Country: UK - Scotland
Town: denny
Boat name: breezy
Make: northcraft
Length: 6m +
Engine: honda 150
Join Date: May 2016
Posts: 888
I had to do a special bracket for my humber when I had it as there was little or no room to mount anything in the back of it
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Old 15 July 2019, 13:07   #4
Phil M's Avatar
Country: UK - England
Town: Whitehaven
Boat name: Cerberus
Make: Destroyer 5.8
Length: 5m +
Engine: 115hp Merc 4st
Join Date: Oct 2012
Posts: 462
The transom top on the destroyers isn't level so fitting an aux without a bracket is not possible (not on mine anyway!).

I did the below, made form a few planks of oak, glued and screwed together then coated in epoxy resin with a glass matt back face (which probably wasn't needed). It mounts using the same bolts as the a-frame to save drilling the transom any more, although I had to replace the originals with longer ones.

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Both engines are long shaft. The main engine is offset just over an inch to stbd.

This setup gives full steering of both and works for me. There is no flex or slop like I used to get on the old adjustable bracket. I'll agree it needs a lick of paint though.

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