Mounting an A frame

two stroke mick · 27 May 2008, 12:35

I remember asking about drilling the transom fro the purpose of mounting an A frame. I was advised to drill the holes a little larger than the bolt and seal the hole with sikaflex. The bolts that I intend to use are 10mm in diameter. I was proposing to drill 11 mm diameter holes.

Your thoughs please
TSM

BarflyRIB · 23 November 2009, 19:56

sorry for waking this post... but last I saw an A frame that was mounted through the upper deck and fixed on the hull! On the outside of the hull you saw the metal plates to keep A frame fixed. Is this the normal way to mount an A frame (drilling holes through the hull,...)

chewy · 23 November 2009, 20:03

No.

Rogue Wave · 23 November 2009, 21:31

It's certainly a normal way to mount Lifting Points so I don't see a problem with an A frame providing there is no void between deck and Hull

Ian M · 23 November 2009, 21:56

Quote:

Originally Posted by BarflyRIB

sorry for waking this post... but last I saw an A frame that was mounted through the upper deck and fixed on the hull! On the outside of the hull you saw the metal plates to keep A frame fixed. Is this the normal way to mount an A frame (drilling holes through the hull,...)

My old XS had a 2" 'A' frame (for towing etc) and that was mounted through the hull on the forward legs. Simply sealed with sealant. No problems with it whilst I owned the boat.

BarflyRIB · 24 November 2009, 06:21

it's humber destroyer fitted with that A frame - when I saw this, I was very suprised and thinking myself... who's drilling holes in the hull??? but it's normal like I read :-)

9D280 · 25 November 2009, 09:40

Yep, mine was mounted like that too..... Amusingly the sealing was done by parking an offcut of rubbing strake between the hull & the stainless plate, and as it was primarily there as a lifting eye and not to hold the frame down, I had 4X 20 odd mm of M10 thread and a nut poking down below the hull from the U- bolt. Made it an @rse to get off the trailer!

I decided to streamline it a bit on the assumption the boat is no longer in a commercial role so no need for the lifting points, and replaced it with a gallon of sikaflex, a few pan head screws and a couple of eye nuts inside to keep the lash down option available.

One thing to watch - keep an eye on the leading edge of the plate - it;s amazing how quickly the sikaflex is jetwashed out by the passing water.

Tim M · 25 November 2009, 11:44

My old Ribtec had it's aframe bolted through the deck. Was very strong