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Racundra
05-22-2018, 11:51 PM
Hi everyone

I am half way through planking my clinker/lapstrake Guillemot dinghy (Iain Oughtred design) and am thinking of mounting the bilge runners now.

I know where they go in the fore-aft and port-starboard sense, but should I fit them so they follow the sweep of the planking or just dead straight, fore and aft?

Thanks

Noel


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andrewpatrol
05-23-2018, 12:56 AM
Bit strange thats not on the plans, but my first thought is to go straight for a lack of turbulence (if that makes any diff at low speed ) and it’ll be easier.

Peerie Maa
05-23-2018, 07:27 AM
Pictures on here: http://www.mikkelpagh.dk/
http://www.mikkelpagh.dk/images/thumbs/08.jpg
looks as though the runners are screwed through the lap for strength., They are short and small enough to have little effect on performance, but do not bend them sideways if you can avoid it.

nedL
05-23-2018, 09:07 AM
I would definitely place them on top of, and following the lap. That is the only place where they will have backing against the ribs on the inside. ..... If she is traditional lapstrake, if glued lap,..... never mind. :)

wizbang 13
05-23-2018, 10:47 AM
I'd wait for a few dings or scratches, put the chafe gear there. Keep it to a minimum. Maybe even just a gob of faired out epoxy....which is what I do.
Unless you drag her in a rocky place.....

Racundra
05-23-2018, 12:36 PM
Pictures on here: http://www.mikkelpagh.dk/
http://www.mikkelpagh.dk/images/thumbs/08.jpg
looks as though the runners are screwed through the lap for strength., They are short and small enough to have little effect on performance, but do not bend them sideways if you can avoid it.



Thanks for that link and photo... the runners seem to follow the line of the lap - they certainly sit on top of the lap join. There is only about 0.75 inch of sideways bend along their 38 inch length, so perhaps that is ok...


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John B
05-23-2018, 08:48 PM
Interesting, I've only ever run them straight but now I see them on a clinker I think I'd do that on that sort of construction too.
What I do is look and see where the bilge lands on the ground and make that point match about 1/3 back on the runner, because as you move the dinghy you always add some 'lift' to the bow. So quite a bit further back on the hull than that photo .