Surface drive stuffing tube transom exit hole

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Kez

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Feb 27, 2003
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Rebuilding a 30 year old Dumas CF .40 deep vee and converting it to surface drive. I noticed it is customary to drill the stuffing tube exit hole over sized to about 1/2". I see it would allow for some small adjustment. But the hull will take on water if it is not moving. Is there anything wrong to drill the hole to 1/4" and glue the stuffing tube in place?

Thanks, k
 

brad nichols

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May 10, 2010
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That's why we put the pool noodles in. Or are you going electric, if so I would use one of the adjustable stinger struts and drill 1/4 hole in transom.

Brad
 

Kez

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Feb 27, 2003
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Brad,
I am going to put a period correct HP .40 in it ;-) I have never tried a stinger strut before. But from what I can see, it would allow for angular adjustment only. I cannot move the drive up and down.
For sure I will stuff a lot of pool noodles in the hull to keep it afloat. Still, I wonder if I need to drill a hole that big
Thanks, k
 

john v

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Oct 10, 2007
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the bigger hole will let you move the strut up and down , with the stinger you have if there is no provision for adjustment than you can seal the stuffing tube to the transom. the stingers i have allow you to adjust up and down movement. i use plumbers putty to seal an oversize hole so i can adjust at the pond
 

brad nichols

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May 10, 2010
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The stinger strut will allow up and down movement if you slot the hole but then you have a hole to let water in. If it is a nitro boat don't worry as long as you have lotion in the boat.

Brad
 

Daniel's Racing

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Apr 14, 2008
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1,133
Rebuilding a 30 year old Dumas CF .40 deep vee and converting it to surface drive. I noticed it is customary to drill the stuffing tube exit hole over sized to about 1/2". I see it would allow for some small adjustment. But the hull will take on water if it is not moving. Is there anything wrong to drill the hole to 1/4" and glue the stuffing tube in place?

Thanks, k
I would make s nice neat elongated slot not a giant round hole. If you want to be able to adjust the height you need movement. Don't do it and it is a biotch to do later. Got to pull the whole works apart.

Make a nice clean slot and test and tune with plumbers putty and if/when your done moving you fill it all in with white silicone.
 

Kez

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Feb 27, 2003
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1,084
Thanks all for your replies. I have never thought of using plumbers putty to seal the hole. I may give it a try. I have no idea what's in plumbers putty. Will it affect adhesion if I decided to seal up the hole later?

I am going to use a Speedmaster strut instead of a stinger drive. The center line of the hole will be 3/8" above the vee. I hope this will get me close to optimal setting without having to make much adjustments
 

David Ashcroft

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Jan 26, 2014
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nitro boaters never use anything to seal the transom strut hole...that's just the way we roll...
 

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