Be gentle, it's my first time!

Lou C

Supreme Mariner
Joined
Nov 10, 2002
Messages
12,641
Re: Be gentle, it's my first time!

If you have not seen it, there is a great web site on the Cobra drives at this address:<br />www.funkopolis.com:8080/~stuart/cobra/<br />go to this site, print it out, and with an OMC shop manual (still available) you will know all that is known about these drives.
 

alumistar

Petty Officer 2nd Class
Joined
Nov 23, 2003
Messages
154
Re: Be gentle, it's my first time!

Hey CCrew...Awesome! Want to refurb my Larson?<br />|<br />|<br />|<br />|<br />|<br />V
 

Realgun

Commander
Joined
Jul 31, 2003
Messages
2,484
Re: Be gentle, it's my first time!

CCrew looks very good. Did you save the under console shelves? Or are you going to build new ones? I have not done much with my 1700 too cold here for epoxy now.
 

CCrew

Chief Petty Officer
Joined
Sep 10, 2003
Messages
416
Re: Be gentle, it's my first time!

Alumistar... Let me think about that one for a sec........Done, I think I'll pass! :D <br /><br />Realgun, <br /><br />I have the shelves, but they're going to be redone so I'm basically just saving them for templates. The port one had a hole rotted through the top of it anyway. <br /><br />I know what you mean about cold. If it weren't for a heated garage mine would be sitting getting nothing done on it also!<br /><br />I am playing a bit of havoc from the Mrs. for the house smelling like epoxy tho..<br /><br />Roger
 

walleyehed

Admiral
Joined
Jun 29, 2003
Messages
6,767
Re: Be gentle, it's my first time!

CCrew, nice looking work!!!! I do quite a bit of glass work as well, and I can see you've done your homework....Nice!! :)
 

Realgun

Commander
Joined
Jul 31, 2003
Messages
2,484
Re: Be gentle, it's my first time!

CCrew I have a garage that can be heated but the wife hates to scrape windows in the morning and truth be told so do I so for now it sits forlorn in the front yard. :)
 

Boomyal

Supreme Mariner
Joined
Aug 16, 2003
Messages
12,072
Re: Be gentle, it's my first time!

CCrew, do the bottom angles, toward the bow, change (compound angles) as the stringers go further forward. If so, how did you transcribe and cut them on the stringers. Seems that you wouldn't want a lot of epoxy filler between the bottom of the stringer and the hull.
 

CCrew

Chief Petty Officer
Joined
Sep 10, 2003
Messages
416
Re: Be gentle, it's my first time!

Boomyal, <br />Yes, they do exactly that in about the last 18 inches. I saw or knew no way to transcribe them directly, so basically I left them a bit oversized and had to sand them to fit. A bit time consuming, took about 45 minutes per stringer of "test fit" and go sand some more, but in the end I got them. Hardest part was where they made the transition from floor to bow. Basically ended up with a radius in the turn instead of compound angles, and it was much different on the outside edge than the inside. .<br /><br />Factory never went to that trouble.. It was actually an air gap under the stringer when they were cut away, and even the bottom side of the factory stringer wasn't angle cut to match the hull. They were just a square edged plank.<br /><br />In no place after they were fitted was there a gap larger than about 1/16-3/32, and I embedded them in epoxy glue and let it set with braces across the top of the stringers w/cinder blocks for weight. After 48 hours of that I pulled the braces, and tested to see if I could pop the stringers loose from the hull. Even with my 190lbs pounding them I couldn't. So I glassed 'em in :)<br /><br />Regards,<br />Roger
 

Boomyal

Supreme Mariner
Joined
Aug 16, 2003
Messages
12,072
Re: Be gentle, it's my first time!

CCrew, thanks a bunch. You are providing valuable foreknowledge for my upcomming project.<br /><br />It would seem that care would need to be taken to keep the tops of the stringers level with each other?<br /><br />Was the inside of the hull symetrical enough that you could fit one stringer then clamp the two side by side and use the finished one as an opposite template to cut and shape the 2nd one?<br /><br />Also I am not sure what you mean by 'radius' at the bow end of the stringers, where they transition to the hull?<br /><br />I think that you are saving me, and any others listening, a whole lot of head scratching. At least for those who want to do a precision job as you are doing.
 

CCrew

Chief Petty Officer
Joined
Sep 10, 2003
Messages
416
Re: Be gentle, it's my first time!

Boomyal, <br />Mine was symmetrical enough that I was able to cut the first one, then use it as a blank for the second. Largest advantage was that when bayliner laid the original stringers, they did so after the layer of roving in the main hull layup, and before they laid mat and chopper glass to it. I found that if you're extremely careful you could sand the mat/chopper down with a 50grit sanding disc on a 4 1/2 grinder until you just started to see the roving pattern, and that left you with a great consistent, level area to fit the stringers to. The area directly under the factory stringers are to that level already, all you're really doing is fairing it out a bit more. I found that by doing that it left the finished layup back to only a bit higher that the original. Be advised though, that it's a lot of sanding, and a lot of dust. That's effectively how I killed 3 grinders. Also.. and this is important.. If the boat is on a bunk trailer, especially the Caulkins Escorts that they were originally sold with, that all the weight of the boat is on the bunks right on that area that the stringer was, and you have to be careful that the hull doesn't give inward from the weight. I had to support the boat under both rear corners and under the very front of the bow to not have the hull deformation. Best way to tell is to sight along that strake at the stringers on the outside from the rear of the boat. If it's out, you'll see it there. My boat had about 1/16 already, just enough to be visible from years of sitting on the trailer, and it never all came out, but had I glassed it just sitting in place there would have been a heck of a hook in the hull. Didn't have to take it off the trailer at all, just distribute the weight so that it wasn't all on the bunks. <br /><br />As far as the radius, as you make the transition from the bottom of the hull into the bow, it's not a sharp transition, therefore it isn't one angle into the other. instead it's a bit of a sweeping curve in a short distance. It's also different on the inside of the stringer than the outside, so you end up trying to come off an angle that's used at the bottom of the hull, to the bow angle, compensating for the fact that the stringers don't go straight into the bow, but intersect into the side of it in a way. Biggest thing you have to be careful is making sure that on the initial cuts that you leave enough meat on the stringer to be able to blend. If you just cut one angle into the other, you end up with the inside bottom of the radius short on material. Don't ask me how I know, but I have a third stringer to use as firewood! Hope that explains, but it's kind of hard to describe.. <br /><br />Regards,<br />Roger
 
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