Revenger build thread!! - Page 6

larby · 23-01-2010, 09:32 AM

Yeah, as Burty mentioned, i can't imagine there's any room for give with ply. Also as mentioned, unlike laminated beams, the directions of the grain are at right angles, this means that half of the wood is effectivley not doing anything at all.
There were at least 15 breaks in each of the stringers i took out. I guess in a heavy (leisure) built boat with good glassing, it doesn't matter what they're made out of, as there's not much flex and the strength is in the glass, as TD mentioned.
However, in a boat which is built light and flexible, whilst the strength is still in the glass, there must need to be some flex in the material the longit is made from, in order for it to flex with the boat, not fracture apart. Interestingly, where there were breaks in the ply, the surrounding glass was also shot, as it created a 'lever' point i guess.
More research required i think!

James

motorvator · 23-01-2010, 01:28 PM

http://www.glulambeams.co.uk/glulam_specifications.html

42 x 225 x 15100 in stock and they cut to length.

Generally made from spruce so very straight grained and structurally strong.

Supposedly 18% stronger than standard timber.

I can't see a reason why they couldn't be used as they are used in exterior and high humidity situations.

May be worth giving them a call and asking what they think.

Big Dutch · 23-01-2010, 06:27 PM

Go to Norman Piette saw mill Larby they used to cut my scaffold boards-any length you want,mind they were sawn finish.
Alternativly you could use Columbian pine or Cedar(light and won't rot)
They also have Hemlock in stock we made four 20foot flagpoles with that.
Last choice plain old red deal.

larby · 23-01-2010, 08:34 PM

Motorvator - I don't really want to stray away from the norm here and I need it to be not too expensive. If i were building a high budget new boat then I'd be more interested in the exotic stuff. Thanks for thinking outside of the box though!

Dutch - Thanks for the tip, i was planning on taking a trip to piette on monday. I'm curious as to what they define as a scaffold board though. By definition it should have no knots or faults and the grain should run straight from one end to the other.
I'm sure they'll have something in stock. I'll mention douglas fir to see what the price is, and ask them what alternatives they recommend.

James

larby · 24-01-2010, 07:41 PM

Not got a massive deal done this weekend. Had a day with Soph on saturday and a big lunch today, so no real time to get on with anything.

Got the rest of the main stringers out, now just got the central one and the little outers left. I'm leaving these in till I've got the hull supported properly later this week I think. I'll just post pics of how I'm supporting it rather than explain.
Found some amusing bits as I'll explain in the pics...

James

larby · 24-01-2010, 07:48 PM

Not sure what to bed your stringers in with? Pete had a novel idea... Nothing!

This shows what the stringers were sat on rear of the engine bulkhead. How they stayed in I just don't know. In most places the bottom of the stringer was 1" off the hull (I'll show that beter in a sec), with no material at all underneath.

Last pic is of the centre side of the board, where the two were 'stuck' and nailed together. Mmmmmmmmmmm.

larby · 24-01-2010, 07:53 PM

While ripping up the stringers and balsa, I wondered how all the water and oil got in. Well not any more!

These pics show the rear stub i left of the stringer. There's an inch gap between stringer and hull the length of the engine bay, and a drain hole straight through it at the back. As you can see, i could stick my finger in the drain hole and out of the stringer.
From there it could run all the way under the stringer, and due to the delamination into the glass and the balsa.

larby · 24-01-2010, 07:59 PM

This is the first time I've really been able to show what I mean about the delamination. The before and after photos with the pry bar show that i can shove it freely all the way under, only the balsa core is stopping it going further.

Last pic shows an area of stringer further up the boat where it was bedded in pure resin about 3/4" deep. Better than nothing i guess!

larby · 24-01-2010, 08:01 PM

So thats all i got done this weekend. Here's a pic of how it looked when i was done. I got up last thing this evening after the meal and cleaned all of the crap out to give me a nice clean base to start the week with again.

James

Jono · 25-01-2010, 07:34 AM

.....at this point I think I would have quietly set fire to the hull and walked away muttering...10/10 for perseverance.

Jon Fuller · 25-01-2010, 07:47 AM

Quote:

Originally Posted by Jono

.....at this point I think I would have quietly set fire to the hull and walked away muttering...10/10 for perseverance.

That's coz you norveners aint made of the same stuff that suveners are.

a little proj like that is a walk in the park for someone south of Watford.

I think the bloke that originally moulded it, had a midlands accent!

Jono · 25-01-2010, 08:20 AM

Quote:

Originally Posted by Jon Fuller

That's coz you norveners aint made of the same stuff that suveners are.

...or us norveners aren't such tight-wads as you suven jessies...and would have bought a good 'un in the first place.....

Quote:

Originally Posted by Jon Fuller

I think the bloke that originally moulded it, had a midlands accent!

Oi.... we're not all bad up here you know...

..well 'cept for the Wolvo Nobba...

dowdy · 25-01-2010, 04:59 PM

If i didnt know any better i would say that the third pic with the nails in was something salvaged off the Mary Rose.Who did you say laminated it James?Whoever it was i hope hes watching all this.Ithink we should all have a whip round and buy you a new boat to play with,failing that,write a book,think it would be a best seller.

Jon Holmes · 25-01-2010, 05:05 PM

Im sure Mr Sloggett would be pleased to see how this boat was put together.

dowdy · 25-01-2010, 09:34 PM

Larby must have his finger stuck in another hole,he hasnt posted any more pics tonite.

larby · 25-01-2010, 11:31 PM

Dowdy - Very good! Too busy in meetings to organise the racing over here that I can't compete in now! Hoping to get some done tomorrow night, then hopefully take some time off on friday, it's a busy week!
From what I know it was Pete Berrow who laminated this part of it. It's been hard to find out the truth though. I'd certainately like to kick whoever it was in the groin though!

Jon - I'm sure he would be interested/appauled! Does anyone have any contact details for him? I'd be interested to hear his take on it all!

James

Gordon McMath · 26-01-2010, 09:56 PM

Dont worry im keeping him informed,he is reading your posts with increasing mmm how shall i put it-interest ! watch this space for his reply !!!

hunton69 · 27-01-2010, 12:19 AM

Quote:

Originally Posted by Gordon McMath

Dont worry im keeping him informed,he is reading your posts with increasing mmm how shall i put it-interest ! watch this space for his reply !!!

Out of interest how old is the boat?

If you bought an old Ford and the sills and wings were shot would you complain

How often did the boat race.

Salt water, fresh air and neglect does wonders.

So how much did you pay for her?

Jon Holmes · 27-01-2010, 08:56 AM

To be fair, i dont think the boats condition for its age and price is the beef, it's more its original construction method that is interesting.

Paul E · 27-01-2010, 09:27 AM

Quote:

Originally Posted by hunton69

Out of interest how old is the boat?

If you bought an old Ford and the sills and wings were shot would you complain

How often did the boat race.

Salt water, fresh air and neglect does wonders.

So how much did you pay for her?

I think what James is discovering goes far beyond normal wear and tear of a raceboat. If you bought an old ford race car then found out the chassis was welded together out of old pig iron you'd complain!