Dinghy development: 29er foils.

Print Page | Close Window

29er foils.

Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=3454
Printed Date: 19 Aug 25 at 8:31am
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com

Topic: 29er foils.

Posted By: 29er310
Subject: 29er foils.
Date Posted: 01 Oct 07 at 4:26pm

I have an old set of 29er foils which came with my boat. The plastic bottoms of the foils have been cracked and knocked out by the previous owner running aground. Does anyone know what would be the best material to fill the holes and how i would go about fairing them again.

Cheers

George

Replies:

Posted By: Smight at BBSC
Date Posted: 01 Oct 07 at 6:16pm

Is that you cooky?

-------------
RS600 988

Posted By: 29er310
Date Posted: 01 Oct 07 at 6:52pm

Maybe. haha.

Posted By: Iain C
Date Posted: 01 Oct 07 at 7:16pm

Firstly, check your class rules. I know of an incident invovling a very lengthy discussion and protests etc when someone was deciding exactly what could be used as the "carpet" inside the foil cases...

-------------
RS700 GBR922 "Wirespeed"
Fireball GBR14474 "Eleven Parsecs"
Enterprise GBR21970
Bavaria 32 GBR4755L "Adastra"

Posted By: Ross
Date Posted: 01 Oct 07 at 7:18pm

I've got to be the only Cherub owner who dosn't know the answer to that question. But if was to hazard a guess, I would say it involved this miracle know as "bog". Which i think is just sticky stuff mixed with glass and....stuff...

-------------
Ross
If you can't carry it, don't sail it!

Posted By: Wave Rider
Date Posted: 01 Oct 07 at 7:21pm

epoxy & microballoons - Very impressive stuff :D

car body filler works too :D

Franko

-------------
-[Franko]-
Chew Valley Lake Sailing Club
RS600 933

Posted By: 29er310
Date Posted: 01 Oct 07 at 7:42pm

Thanks I will try that,

Cheers

George

Posted By: redback
Date Posted: 01 Oct 07 at 11:31pm

You can get car body filler with glass fibre mixted in. That might be tougher and if you spatular it in place and then cover with cling film you'll be able to roughly mould it into shape. The when its hard a little sandpapering should sort it out.

Posted By: tickler
Date Posted: 02 Oct 07 at 8:49am

I have found that , certainly on cast resin laser type foils, that if you drill tiny holes in the edge of the foil and araldite stainless pins or wire into those holes, building filler round them, it helps to stop the repair falling off. For a very big repair I once self tapped a stainless screw in and ground off the head afterwards.

Posted By: 29er310
Date Posted: 02 Oct 07 at 9:15am

Im not sure drilling into the metal foils would be a good idea, they are the old design so they are metal filled with some type of foam and the the ends are capped by plastic.

Posted By: Skiffman
Date Posted: 02 Oct 07 at 9:19am

I use to just use car body filler plastic padding because it drys in less than 10mins if you get a hair dryer or heat gun on it. You just put a layer on, then sand it and just keep putting layers on until you get the right shape.

The best thing to you would be epoxy silica and microballons, but the problem is that it is much harder to sand than plastic padding but it would last forever.

Interestingly I have a set of Aussie 29er foils which have epoxy ends compared to the Ovi foils which are a rubbery type. What would you prefer to have rubber which has a rough finish or high gloss epoxy?

You can fill the ends of foils but you are not allowed to fill along the join (where the two extruded aluminium sections meet).

-------------
49er GBR5

http://www.teamfletcherandsign.co.uk - teamfletcherandsign.co.uk
Team Fletcher and Sign campaign site

Posted By: 29er310
Date Posted: 02 Oct 07 at 9:25am

Is there also any way of fairing the metal of the foils.

Posted By: Franco
Date Posted: 02 Oct 07 at 12:53pm

Simply, no.

They are two alloy extrusions which are anodiesd and then assembled. If you were to fair the section, pretty sure it would be against class rules, you would also remove the anodising and reduce the wall thickness of the alloy reducing the stifness.

Net gain, waste of time.

The epoxy filled ends often tend to crack as it's obviously not as flexible as the ruberised originls, and the alloy does flex.

Posted By: 29er310
Date Posted: 02 Oct 07 at 1:38pm

so basically i should just save time and buy a new set.

Posted By: Ross
Date Posted: 02 Oct 07 at 1:55pm

Metal! In a foil! All this sounds like a very heavy way to make a foil.

-------------
Ross
If you can't carry it, don't sail it!

Posted By: stuarthop
Date Posted: 02 Oct 07 at 2:08pm

Why does the metal part of the foil require fairing? Its against the class rules. as for pluging the ends of the foils either car body filler or BOG (epoxy and microfibres) depends on whether you want to bodge it or not. Personally i'd fill them with BOG and spend the exra time reqired to fair them as it would be a much stronger and longer lasting repair. Apparantly the rubber ends on the 29er foils are pourus (sp) so they leak after a while and make the foils heavy, if you look at most of the boats at the front of the fleet you will find that they have 'damaged' the foil ends and then put a thin layer of epoxy over them to seal them as part of the 'repair' as this would technically be against class rules, or so i've been told if it was done to enhance performance.

I'll ask my brother when I get home from work as he'll definatly know the rule.

-------------

Posted By: 29er310
Date Posted: 02 Oct 07 at 5:08pm

I think the guy who owned the boat before me was a bit of a prat, it looks like the boat was sailed somewhere where the bottom was very hard not nice soft mud. so the have been well hammered in to the ground on a few occasions.

Posted By: k_kirk
Date Posted: 03 Oct 07 at 2:50am

I think the plastic piece at the bottom of the foil can be taken out and replaced altogether but I do not see this listed in the spares website from Ovi or PS2000 or Bethwaite. Perhaps you can write to Ovi and see if they can nick off a set for you from their production runs. Just a thought.

-------------
http://gaijinonfoils.blogspot.com/ - Gaijin on Foils

Posted By: 29er310
Date Posted: 03 Oct 07 at 8:19am

Yeah good idea.