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Old 15-10-2013, 05:55 PM   #1
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If you have 5 mins spare some gearboxe advice would be great

Hi there fellow boat mad people

Ive just purchased a bull noise 15" gearbox off a mate of mine and have a standard one too to try as seen in picture can someone tell me the fores and againsts of running each gearbox on a B-22 Backdraft please

Niall
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Old 15-10-2013, 10:21 PM   #2
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Just test both of them and find out yourself dude, all boats and set ups are different!
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Originally Posted by Niall.Bougourd View Post
Hi there fellow boat mad people

Ive just purchased a bull noise 15" gearbox off a mate of mine and have a standard one too to try as seen in picture can someone tell me the fores and againsts of running each gearbox on a B-22 Backdraft please

Niall
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Old 15-10-2013, 11:22 PM   #3
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use the dildo box but remember to lube up
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Old 16-10-2013, 01:08 PM   #4
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Wallby's right, just try anything and everything until you find a set up that you get on with.

Are both boxes the same ratio?
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Old 16-10-2013, 01:24 PM   #5
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Mind if I ask where you got the one on the right from? My dad used a box that shape in ocr years ago
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Old 16-10-2013, 01:59 PM   #6
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Quote:
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Mind if I ask where you got the one on the right from? My dad used a box that shape in ocr years ago
and it does look a bit "YEARS AGO"
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Old 16-10-2013, 02:18 PM   #7
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If I remember correctly dad and clive worked on the shapes and in the end had great results on the Argo and then sold it to Chris Bryant
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Old 16-10-2013, 04:21 PM   #8
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Just test both of them and find out yourself dude, all boats and set ups are different!
We would like to try both but the one on the left has a 20" drive shaft and is not ours to keep, and the one on the right is 15" drive shaft that will fit the setup we have got on the backdraft, just thinking is it best to cut off the right hand gearbox nose cone to then make it the same as the left hand gearbox or leave well alone. Cheers Ivan
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Old 16-10-2013, 04:26 PM   #9
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Mind if I ask where you got the one on the right from? My dad used a box that shape in ocr years ago
He got it from a chap in Guernsey that was using it on his B23, Now we are hoping it will work on the Backdraft.
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Old 16-10-2013, 04:52 PM   #10
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I think it may be my old mans old box
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Old 16-10-2013, 05:16 PM   #11
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gearbox

Quote:
Originally Posted by Niall.Bougourd View Post
Hi there fellow boat mad people

Ive just purchased a bull noise 15" gearbox off a mate of mine and have a standard one too to try as seen in picture can someone tell me the fores and againsts of running each gearbox on a B-22 Backdraft please

Niall

just put it on and use it , cone on or off wouldn't of thought it would make a noticeable difference to be honest
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Old 16-10-2013, 05:34 PM   #12
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Quote:
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just put it on and use it , cone on or off wouldn't of thought it would make a noticeable difference to be honest
It will make a difference for sure.
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Old 16-10-2013, 08:24 PM   #13
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It will make a difference for sure.
Do you know if it will be a good or bad difference, we are hoping to try out a jackplate at some point as well, this may or may not be a good thing for the Backdraft.
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Old 16-10-2013, 08:53 PM   #14
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I think you'd have trouble with the dog's dick box hitting the transom without a jackplate or setback of some kind, seem to remember it being very close to the bracket on Jacques' B23
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Old 16-10-2013, 09:08 PM   #15
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I think you'd have trouble with the dog's dick box hitting the transom without a jackplate or setback of some kind, seem to remember it being very close to the bracket on Jacques' B23
Yes you are right the dog's dick dose hit the transom, that's one of the reasons to use a jackplate, or we will have to cut off the dog's dick,
I just don't know whether or not to cut the dog's dick off or not, is it worth keeping.
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Old 16-10-2013, 09:08 PM   #16
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Obviously I don't know the dimensions but dad ran his on a 21 Argo with no transon lift. The way I see it some one has adapted a perfectly good mercury box and left it like it. But i imagine it could be boat sspecific. Try it mate

On closer inspection it looks slightly different to what i remember. But hey good luck
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Old 16-10-2013, 09:19 PM   #17
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Quote:
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Obviously I don't know the dimensions but dad ran his on a 21 Argo with no transon lift. The way I see it some one has adapted a perfectly good mercury box and left it like it. But i imagine it could be boat sspecific. Try it mate

On closer inspection it looks slightly different to what i remember. But hey good luck
Ok thanks, we best get looking for a jackplate then.

Cheers
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Old 16-10-2013, 09:59 PM   #18
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Id be looking for a 15" driveshaft first!
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Old 17-10-2013, 08:01 AM   #19
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Quote:
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just put it on and use it , cone on or off wouldn't of thought it would make a noticeable difference to be honest
Just out of interest on what experience to you make this comment on?

We tried a couple of designs on our Class III boat and it made a significant difference to the handling all in a good way - why else would people go to the trouble of making these boxes?
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Old 17-10-2013, 08:13 AM   #20
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Roy Smith used the dog's dick style box on his B-23 very successfully. If I remember correctly he got the Royal Navy involved in its design. The idea was along the lines of 'that's the shape of a submarine so there must be a reason for it'!
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