View Full Version : Stem Repair?

Capt'n Pea
11-11-2003, 10:00 PM
ok here are pics... how much would you do?





http://www.imagestation.com/picture/sraid88/p816faa243730eff75408f7390a485fd1/fa94ed12.jpg http://www.imagestation.com/picture/sraid88/pf65fb6053200fe0932ea89420fb181ba/fa94ecd4.jpg

Jack Heinlen
11-11-2003, 10:22 PM
All of it. You've got it torn apart: don't put good wood after bad in rebuilding. You have to remove anything that even smells of rot, and then treat the smelly stumps before you put new wood in.

That's the way it looks to me, anyhoo. It may look different in person.

Some of the frame ends and floors don't look so copacetic either, BTW.

LOOK how light that timber is!

I'm thinking that this construction: Lyman, Thompson, Chris, is probably an epitome of light skiff work.

I'll wager that the stem was inferior timber, likely the infamous Phillipine mahogany spoken of here recently.

Our SS had real white oak in the stem, but was built in 58'...

[ 11-11-2003, 11:29 PM: Message edited by: Jack Heinlen ]

11-12-2003, 07:18 AM
Chris Craft eh? How is the actual stem, any soft wood there? (Should be white oak for a C.C.) There certainly appear to be ribs that need to have their heels replaced. the big stuff (stem, keel, floors,etc.) look like they may be ok, but only you can tell for sure. Those ribs certainly need attention. What have you found in the way of soft wood?

Capt'n Pea
11-12-2003, 08:43 AM
The Stem is two piece construction.

Mahgony with two pieces of marine ply laminated on. The ply is bad but, the stem still seems pretty solid. It appears that the boat sat for quite a while with water in the bidge at dry dock.

The first 2-3 planks have to go.. delamination has shown itself, but, really everything aft of the bulkhead still looks great. There are some ribs that are going to get replaced or sistered.

Someone at one time sistered the ribs up front, and did not do a great job of it. Proves the old saying.. "If your gonna do it, might as well do it right" I'm going to re-arange things up front a little as Chris did not such a good job of allowing ventilation in these areas.

The sawn frames are good, but the trusses connected between are going to be replaced. There not really bad, but, since I'm there.

Next steps: (feel free to comment, I'm a rookie but, have some good help in a Landing School grad that owes me time).

I have to install some ribs to preserve the shape before I remove more planking (garboard is the only one gone now). I am going with the lanimate in place technique with mahogony strips and Googe Bro's. Once I get a few in I can take out the next planks to get more breathing room to get at the stem.

I will really be able to get at the stem after I remove the ply off the structure. If I find any really bad spots in the core I will scarf out and replace using googe again. CPES everything then laminate new ply (Okume) on both sides of the stem as in the original constuction.

11-13-2003, 11:34 AM
I'm having a bit of trouble visualizing the stem construction you are describing. (It has a mahogany core with ply glued to both left & right sides? Are the rabbits in only the mahogany or does the plywood make up part of the rabbits? Do the planking screws go into just mahogany, or the plywood too?). It sounds like you have a pretty good handle on where you are headed with the repairs. ( I made it a point not to comment on those old rib repairs :rolleyes: , Glad to hear you will be taking care of them.) The trusses you are referring to that connect the sawn frames across the top of the keel are actually called 'floors',- good to replace any that look questionable while you are in there. AS you say, the bilge looks real nice (clean too) to bad she was sitting nose down for that period.

Capt'n Pea
11-13-2003, 02:09 PM

Your close on the stem construction...

Yes it is a mahgony core with ply glued to both sides, using the lovely stuff CC had then (they used it on the planking too, tought to get apart), I'm told a prelude to 5200. The ply misses the rabbits and the screws (about every 1 to 2") go into the mahgony only. It looks like the ply is intened to increase the section modulus of the composite structure by utilizeing the high inertia side of the ply, in bending load, along the length of the stem.

I think Jack is right, this is pretty light construction, and I've know one of these to go down (28' CC Skiff) in a Lake Michigan storm (5-6' short swells), plank or something broke or they hit a deadhead. Everyone was ok the drove it on to the beach where the storm blowing in proceeded to spread it around a couple of miles. I question the condition of that particular boat as the owners were not hands on with it, but just trusted a local guy to maintain it.

Floors will be replaced too....

11-14-2003, 07:21 AM
Ok, I've got that stem construction now. Fairly light weight & quite stiff I would imagine. The C.C construction is a modified version of Jersey sea skiff construction & yes it is quite light, but very tough & strong!