Announcements
New Discussions
Previous Thread
Next Thread
Print Thread
Rate Thread
Hop To
Page 2 of 2 1 2
Re: What do you get for min weight? [Re: bobcat] #237836
09/19/11 05:32 PM
09/19/11 05:32 PM
Joined: Aug 2005
Posts: 2,921
Michigan
PTP Offline
Carpal Tunnel
PTP  Offline
Carpal Tunnel

Joined: Aug 2005
Posts: 2,921
Michigan
What's wrong with emailing Matt?

--Advertisement--
Re: What do you get for min weight? [Re: PTP] #237839
09/19/11 06:44 PM
09/19/11 06:44 PM
Joined: Dec 2005
Posts: 443
Edmonton, Alberta, Canada
bobcat Offline OP
addict
bobcat  Offline OP
addict

Joined: Dec 2005
Posts: 443
Edmonton, Alberta, Canada
Quote
What's wrong with emailing Matt?


You know, I may have to. He seems reluctant to contact me.

Did you by chance get anything resembling a warranty? I would like to have an idea were I stand when I talk to him.

I did contact him earlier about the flex deck. He didn't offer up that it was a known issue and had been resolved with later boats.

Attached is a pic of the "bulkheads" being bogged in. I know I could hollow them out but am unsure if I need to really save the 500 grams.

I am kind of wondering about the white stuff around the bottom of the trunk. It has a lot of cracking in it but I don't think this translates to cracking in the structure.

Attached Files
DSC02525.JPG (497 downloads)
Re: What do you get for min weight? [Re: bobcat] #237866
09/20/11 10:17 AM
09/20/11 10:17 AM
Joined: May 2003
Posts: 4,451
West coast of Norway
Rolf_Nilsen Offline

Carpal Tunnel
Rolf_Nilsen  Offline

Carpal Tunnel

Joined: May 2003
Posts: 4,451
West coast of Norway
This repair will add some strength. However consider that you now are adding strenght in the upper section of the hull, and not in the lower section. Will this reinforcement be enough to unload the sandwich stringer I can see in the pic sufficiently? A bit late now, but I would have done full bulkheads (hindsight is always 20/20 you know).

Attached is a pic of a ply bulkhead with reinforcements from our Blade project.

I would have taped the half bulkheads to the hull skin to spread the loads a bit more. I would also have cut the holes smile


Attached Files
Mainbeam bulkhead.jpg (444 downloads)
Fixing a Five year old boat. [Re: Rolf_Nilsen] #237874
09/20/11 11:15 AM
09/20/11 11:15 AM
Joined: Dec 2005
Posts: 443
Edmonton, Alberta, Canada
bobcat Offline OP
addict
bobcat  Offline OP
addict

Joined: Dec 2005
Posts: 443
Edmonton, Alberta, Canada
Good points Rolf.
To tell the truth, I am constantly revising my repair plan as I go along. It all just started because I had a nice day without wind, so I decided to open her up. Then I glassed the crack. Then I decided that wouldn't work for long. So, I created a bulkhead out of a piece of scrap (which is one reason why it isn't full depth). Then I decided that one wasn't enough. Etc.

As it stands, I just wanted to laminate something across the crack failure in the side of the hull that also supported the crack failure in the deck.

Its not too late to tape the bulkheads in. I would guess that I would have bogged and filleted the bulkheads before taping anywise. It has been a possiblity that the the bulkeheads will "print" through the hull. Perhaps adding the tape will alleviate this.

And I do have the hole saw in my tool bag to create some holes. Thanks for the picture of your bulkheads.

Re: Fixing a Five year old boat. [Re: bobcat] #243435
02/02/12 05:50 PM
02/02/12 05:50 PM
Joined: Dec 2005
Posts: 443
Edmonton, Alberta, Canada
bobcat Offline OP
addict
bobcat  Offline OP
addict

Joined: Dec 2005
Posts: 443
Edmonton, Alberta, Canada
Went ahead and opened up the port hull.
As you can see, I went nuts with the bulkheads, although they still aren't full depth. I just want them across the current failure and supporting the soft decks.

I did swiss cheese them a bit (you don't see this in the picture because i am just test fitting still), and did tape them in with some bog to form a fillet. [Linked Image]
[Linked Image]

Attached Files
DSC02705.JPG (375 downloads)
DSC02706.JPG (369 downloads)
Re: Fixing a Five year old boat. [Re: bobcat] #243451
02/03/12 06:41 AM
02/03/12 06:41 AM
Joined: May 2003
Posts: 4,451
West coast of Norway
Rolf_Nilsen Offline

Carpal Tunnel
Rolf_Nilsen  Offline

Carpal Tunnel

Joined: May 2003
Posts: 4,451
West coast of Norway
I would call those deck beams, not bulkheads wink

Why plywood?

Re: Fixing a Five year old boat. [Re: Rolf_Nilsen] #243464
02/03/12 11:46 AM
02/03/12 11:46 AM
Joined: Dec 2005
Posts: 443
Edmonton, Alberta, Canada
bobcat Offline OP
addict
bobcat  Offline OP
addict

Joined: Dec 2005
Posts: 443
Edmonton, Alberta, Canada
Good point
"One of the upright partitions dividing a ship into compartments and serving to add structural rigidity and to prevent the spread of leakage or fire."

They are being used for structural rigidity but probably won't do much to prevent the spread of fire.

Why Ply? Probably because I don't know any better. Although, I am in North America, I feel more isolated than you are because I don't have the Euro Tornado campaign experience that you have. Shipping foam, etc still has its complications. It is a marine ply and what was available to me. I glassed it on both sides and sealed the cuts with epoxy. Without spin-cat competition to drive me on, I feel my skills have plateaued and a few grams are moot. Around the cans, I finish 6 minutes ahead of the next competitor, how can I tell when I'm slow?

On the other hand, when I first brought this here, a place frequented by designers, builders and manufacturer's, no one suggested different. You mentioned taping the joints and putting holes into the "beams". I did do both although I admit I didn't go for the full height "beams". Shaping and fitting each was a bit more than I wanted to take on.
Or would they have become bulkheads even if they didn't stop smoke and fire?

Re: What do you get for min weight? [Re: bobcat] #243500
02/03/12 05:54 PM
02/03/12 05:54 PM
Joined: May 2003
Posts: 4,451
West coast of Norway
Rolf_Nilsen Offline

Carpal Tunnel
Rolf_Nilsen  Offline

Carpal Tunnel

Joined: May 2003
Posts: 4,451
West coast of Norway
Ply is a good material!

Deck beams and beam set from our F16 build.

[Linked Image]

Re: What do you get for min weight? [Re: bobcat] #243526
02/04/12 04:48 AM
02/04/12 04:48 AM

S
Scarecrow
Unregistered
Scarecrow
Unregistered
S



First time I've read this thread and for the record (though not important) sitting on the boat when flying a hull puts much bigger loads of the windward hull than trapezing where you weight is fed straight into the trap line rather than through the hull into the side stay.

Re: Fixing a Five year old boat. [Re: bobcat] #243527
02/04/12 05:53 AM
02/04/12 05:53 AM
Joined: Jun 2001
Posts: 9,582
North-West Europe
Wouter Offline
Carpal Tunnel
Wouter  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 9,582
North-West Europe

My F16 is made up completely out of ply and issues yet !

It is excellent boatbuilding materiaal when handled right.


Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands
Page 2 of 2 1 2

Moderated by  Damon Linkous, phill, Rolf_Nilsen 

Search

Who's Online Now
0 registered members (), 428 guests, and 82 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Darryl, zorro, CraigJ, PaulEddo2, AUS180
8150 Registered Users
Top Posters(30 Days)
Forum Statistics
Forums26
Topics22,404
Posts267,055
Members8,150
Most Online2,167
Dec 19th, 2022
Powered by UBB.threads™ PHP Forum Software 7.7.1