CRACKER BOX

Designs for inboard or outboard power

Moderator: BruceDow

User avatar
fergal butler
Posts: 1251
Joined: Sun Sep 06, 2009 2:55 am
Location: Co.Dublin, Ireland.

Re: CRACKER BOX

Postby fergal butler » Thu Jun 10, 2010 12:56 pm

Thanks, for the reply, That makes sense I was thinking of the keel as a 2" by 4" and the strain would too much on the stem so I ruled out putting a bend in,but like you say if I do one layer at a time I should be ok.

J Patroni
Posts: 312
Joined: Tue Feb 27, 2007 7:20 pm
Location: Cape May, NJ & 1000 Islands, NY

Re: CRACKER BOX

Postby J Patroni » Thu Jun 10, 2010 2:30 pm

When I applied the keel, I screwed the first layer (along with the epoxy) to the transom.
to the frames and the stem with wood screws. Then with epoxy only I applied the second layer to the first. It was then that I installed the carrage bolts thru the 2 keel layers to the stem. I relied on the bar clamps and epoxy to hold the first layer of keel to the stem. I didn't trust the wood screws in frame 5 alone to hold at the stem. I was careful not to put the screws where the carrage bolts went into the stem.
If you don't build it now, You will regret it later! Already regreting it

Crackerbox Build
http://s232.photobucket.com/albums/ee255/jtpatronimfg/

Checkmate Restoration
http://s232.photobucket.com/albums/ee25 ... 0Starflite

User avatar
fergal butler
Posts: 1251
Joined: Sun Sep 06, 2009 2:55 am
Location: Co.Dublin, Ireland.

Re: CRACKER BOX

Postby fergal butler » Tue Jun 22, 2010 1:47 pm

Looking at the other crackerbox photos my chine logs seem a bit low, I just let them go with the flow and fixed in place,will this be a problem or should I cut them off the stem and try and move them up.Thanks

Image
Image

This is Bob Londress
http://www.glen-l.com/picboards/picboard11/pic582b.jpg

J Patroni
Posts: 312
Joined: Tue Feb 27, 2007 7:20 pm
Location: Cape May, NJ & 1000 Islands, NY

Re: CRACKER BOX

Postby J Patroni » Tue Jun 22, 2010 4:13 pm

If you look at my pictures you will see that they are in the same location as yours. Or real close. I got a dimension of 6" from the shear from the plans. You will find that when the plywood sides meet with the botton plywood at the bow it is almost a straight line, as if it were one piece of plywood.
If you don't build it now, You will regret it later! Already regreting it

Crackerbox Build
http://s232.photobucket.com/albums/ee255/jtpatronimfg/

Checkmate Restoration
http://s232.photobucket.com/albums/ee25 ... 0Starflite

User avatar
fergal butler
Posts: 1251
Joined: Sun Sep 06, 2009 2:55 am
Location: Co.Dublin, Ireland.

Re: CRACKER BOX

Postby fergal butler » Tue Jun 22, 2010 11:11 pm

Thanks again I will plod along with the fairing so,very handy tip you got to splice the sheer clamps at the transom made it a lot easer to bend cheers. :D

J Patroni
Posts: 312
Joined: Tue Feb 27, 2007 7:20 pm
Location: Cape May, NJ & 1000 Islands, NY

Re: CRACKER BOX

Postby J Patroni » Wed Jun 23, 2010 9:43 am

Looking real good. Don't forget to put blocking in the transom for the thru hull exhaust.
The blocks you used at the transom for the buildup spacers between the battens will help strengthen the transom frame. I see that one set of block between the 2nd and 3rd batten will leave a pocket that may trap water and cause unnoticed decay later. It may pay to epoxy a filler piece in there to prevent that.

Keep up the good work.

Jim
If you don't build it now, You will regret it later! Already regreting it

Crackerbox Build
http://s232.photobucket.com/albums/ee255/jtpatronimfg/

Checkmate Restoration
http://s232.photobucket.com/albums/ee25 ... 0Starflite

User avatar
fergal butler
Posts: 1251
Joined: Sun Sep 06, 2009 2:55 am
Location: Co.Dublin, Ireland.

Re: CRACKER BOX

Postby fergal butler » Thu Jul 15, 2010 11:01 am

Another small milestone,The first skin on the sides and transom,all went well I soaked the tumblehome for a few days while I had it clamped to help it bend,I fixed it in place yesterday and then this morning I had a bit of a blowout at the tumblehome were there was a week spot or something,I fiberglassed the inside to try and stop it from getting any worse and forced a bit of resin into the crack,any tips on what I should do.You cant see the bump very well but I can feel it, could I put a timber behind it and try and pull it in with screws or can I sand it out without weakening the plywood.Thanks.
Image

User avatar
ttownshaw
Posts: 2336
Joined: Thu Mar 01, 2007 7:33 am
Location: Owasso, Oklahoma
Contact:

Re: CRACKER BOX

Postby ttownshaw » Thu Jul 15, 2010 11:12 am

I can't see the crack...it looks like you sanded through the outer veneer. Is that the area?
Bill

I told my wife we needed a three-car garage for my projects...she told me to ask her for permission next time before I buy a house.
http://www.unitybuild.net

User avatar
fergal butler
Posts: 1251
Joined: Sun Sep 06, 2009 2:55 am
Location: Co.Dublin, Ireland.

Re: CRACKER BOX

Postby fergal butler » Thu Jul 15, 2010 11:35 am

Yep thats it I put some resin in the crack and gave a bit of a rub as it had splintered up.I will be putting 1/4 mahogany planks over this.

User avatar
ttownshaw
Posts: 2336
Joined: Thu Mar 01, 2007 7:33 am
Location: Owasso, Oklahoma
Contact:

Re: CRACKER BOX

Postby ttownshaw » Thu Jul 15, 2010 11:41 am

If you are planking over it I wouldn't worry about it too much. Sounds like you've done all I'd do. I might add a very thin backer of plywood.
Bill

I told my wife we needed a three-car garage for my projects...she told me to ask her for permission next time before I buy a house.
http://www.unitybuild.net

J Patroni
Posts: 312
Joined: Tue Feb 27, 2007 7:20 pm
Location: Cape May, NJ & 1000 Islands, NY

Re: CRACKER BOX

Postby J Patroni » Thu Jul 15, 2010 1:24 pm

I agree with ttown. Just apply a thin plywood patch to the inside.
There must have been a void in one of the inner layers for that to happen.
While it looks like a hard bend, it isn't. My plywood just wrapped around the curve
and was held in place by the spring clamps till the epoxy cured.

Go to my photobucket Starflite album page 2 third from last photo labeled
"Clamping". you can get there from the Crackerbox album. You can make a simple hand screw from small lumber to apply pressure
to the patch till the adhesive you are using cures.

All thread rod, a few nuts and washers and you are ready to go.
If you don't build it now, You will regret it later! Already regreting it

Crackerbox Build
http://s232.photobucket.com/albums/ee255/jtpatronimfg/

Checkmate Restoration
http://s232.photobucket.com/albums/ee25 ... 0Starflite

User avatar
fergal butler
Posts: 1251
Joined: Sun Sep 06, 2009 2:55 am
Location: Co.Dublin, Ireland.

Re: CRACKER BOX

Postby fergal butler » Wed Jul 28, 2010 11:10 am

Looking like something that might float. :D What do you think of iroko instead of mahogany for the side planking, saw this on ebay might do one of you guy's across the pond.
http://cgi.ebay.com/ebaymotors/ViNtAgE- ... 603wt_1167

Image

User avatar
Onplane
Posts: 668
Joined: Mon May 10, 2010 5:05 am
Location: Dayton, Ohio

Re: CRACKER BOX

Postby Onplane » Wed Jul 28, 2010 1:17 pm

Fergal,

Looking Good! You make it look too easy...

By the way, did you go with a plywood backer at the blow out in your side ply near the transom? If so, how did it hold up? How did you accomplish the patch?

I believe I have the same issue with my Malahini. The right side went on fine, but the left side has a crack... I don't believe it is all the way through, but I can feel raised sharp grain definitely in the outer ply, even though you really can't see it that well.

Charles

J Patroni
Posts: 312
Joined: Tue Feb 27, 2007 7:20 pm
Location: Cape May, NJ & 1000 Islands, NY

Re: CRACKER BOX

Postby J Patroni » Wed Jul 28, 2010 1:18 pm

Looking good. :) I guess you are pumped up now that it looks like a real boat. 8)
If you don't build it now, You will regret it later! Already regreting it

Crackerbox Build
http://s232.photobucket.com/albums/ee255/jtpatronimfg/

Checkmate Restoration
http://s232.photobucket.com/albums/ee25 ... 0Starflite

User avatar
fergal butler
Posts: 1251
Joined: Sun Sep 06, 2009 2:55 am
Location: Co.Dublin, Ireland.

Re: CRACKER BOX

Postby fergal butler » Wed Jul 28, 2010 2:07 pm

Onplane wrote:Fergal,

Looking Good! You make it look too easy...

By the way, did you go with a plywood backer at the blow out in your side ply near the transom? If so, how did it hold up? How did you accomplish the patch?

I believe I have the same issue with my Malahini. The right side went on fine, but the left side has a crack... I don't believe it is all the way through, but I can feel raised sharp grain definitely in the outer ply, even though you really can't see it that well.

Charles


For the blow out I cut a small frame something like this ( and glassed it in seems fine for now. I sanded it down a bit more and found a void in the ply that caused it to blow so I filled it with thick epoxy.
I think it's the photos that make it look easy what happens before the photos are taken is the hard part. :lol:


Return to “Power Boats”

Who is online

Users browsing this forum: No registered users and 5 guests