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Re: Adding Bracket to New Transom
Interesting.
I can't tell from the pictures but does the platform created by the "pods" line up with the existing waterline? Are you going to fill in the notch? Looks like it will work from here. Interesting bracket. |
Re: Adding Bracket to New Transom
Ha Lou;
First off on the first picture your transom looks just like me old transom when I did my boat. I had so many holes in it that it looked like it was used for target practice by a mini machine gun. As to the bracket how is it attached to the transom? Is any of it attached to the stringers in side the boat? Is there any part of your bracket through bolted through your new transom? Or is it simply attached to the outside skin on the transom? I can’t tell with the pictures. FellowShip _______________________________________________ My motto: Just for the Grins :D |
Re: Adding Bracket to New Transom
Platform height? It is even with my old boot stripe, about 3" above my old water line, so I hope it will be at or about the same height with the added bouyancy I hope to pickup? As far as attaching to the hull? It has overlapping layers of 1708 mat from both directions of all structual foam pieces that come into contact with the hull, sides bottom and both layers of Coosa26. I would say that the total laid up thickness of the glass is between 1/4" to 5/16" with each mew piece extending over the first onto new glass. The transom was beefed up using 3 pc's of 3/4" Okume ply glassed between each layer using the same 1708 mat. Also added large gussets to add stiffness to the new transom. As to the question, any bolts, No, hopefully my motor won't fall off??? Now U have me wondering if I should bolt the CMC bracket on and extend the bolts all the way thru the transom,??? See additional Pic's http://i5.photobucket.com/albums/y15...uluII086-1.jpg http://i5.photobucket.com/albums/y15.../suluII048.jpg http://i5.photobucket.com/albums/y15.../suluII049.jpg http://i5.photobucket.com/albums/y15.../suluII102.jpg http://i5.photobucket.com/albums/y15.../suluII103.jpg
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Re: Adding Bracket to New Transom
Fellowship brings up a good point. Without the bolts it seems you are relying on just the outer skin to hold the weight of the motor. I would say bolts with large plates or washers would be needed to tie the whole thing together. After all a transom is basically layers of wood or foam, glass, and resin. The outer skin being just that, a skin. I think Strick posted a while back about using plates and washers to secure his home made bracket.
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Re: Adding Bracket to New Transom
Ha Lou
What I see of your work you have done a great job and looks very very good. I am no engineer and really don’t know how much stress that engine sitting on a bracket puts on the transom but “For Me” I would not trust a bracket that has just been laminated to the outer skin of a transom and expect it to hold. Maybe some one else who knows this type of stuff more then me will chime in on this point. I really like your idea & I have talked about fabrication a integrated bracket into the transom on two separate occasions but I have always thought that you would have to connect the stringers to the bracket and beef up the outside wall of the transom to at lease ½ to ¾ of a inch to boot. Kind of like how Sea Vee does their boats. If you don’t at least through bold through your transom the ¼” outer wall of the transom could de laminate from the transom core and you just lost your $15,000 motor. Again maybe some one else could talk about these types of issues. FellowShip _______________________________________________ My motto: Just for the Grins :D |
Re: Adding Bracket to New Transom
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Re: Adding Bracket to New Transom
Oh yeah, the notch??? I haven't decided on what I'm going to do there yet. I have thought about going up half way to create a seat/cooler combo type of thing, but I like the easy access to the platform as I plan on using her in and around the barrier islands of the Eastern Shore of Virginia. We can get on and off easier than climbing over a full transom. Just not sure how thats going to pan out yet? Thanks for all the quick response's. I think I will have some custom stainless steel threaded rods made up next door and take the advice of the powers that be here, and lock that whole mess down by extending the bolts all the way thru the transom. I was leaning that way, but wanted to limit my holes in that new transome. The votes are already in, THRU BOLT IT!!! :cool:
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Re: Adding Bracket to New Transom
You might also consider a real sea-cock thru hull valve. Nice work!!
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Re: Adding Bracket to New Transom
Are you thinking of running the bolts from the motor all the way through the bracket then into the transom with one continous rod? If so you may want to make up a sleeve for the inside part so it does not "squish" the whole bracket. Or maybe just nuts and washers on the inside between the transom and bracket and the motor and the bracket. Just a thought.
Nice work so far. Can't wait to see it in the water. |
Re: Adding Bracket to New Transom
Thats pretty cool. Nice glass work. Are you using epoxy? Like the others I too think it should be bolted as well. That and the lamination you have already done should make it bullet proof. I worry about the swim platform height. I think it may be right at the water line. You are going to want it a couple inches above the water line. I realize that the water line is different for all boats and I may be wrong but it looks a little low to me. It would be easy to add a couple inches to the height of the swim platform after your first test float if need be. For your washers use 2.5x2.5 inch square SS 1/4 inch thick. Round washers are not nearly as strong as square washers. Have a welder punch them out for you. Of course you can have a template made as well instead of using washers. Thanks for sharing your project and keep us posted.
strick |
Re: Adding Bracket to New Transom
Beautiful glass work, and those knees on the inside of the transom add tremendous strength. Without a doubt secure the bracket somehow to the transom as the set back of the bracket increases the amount of leverage once the weight of the motor is applied, I forget the multiplier but it more then triples the amount of force of the bracket against the transom. I have seen what seemed like strong transoms flex or break when a bracket or bracketed twins were installed even on newer boats.
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Re: Adding Bracket to New Transom
Thankyou guys for all the comments and concerns. This platform/bracket was built using polyester resin not epoxy. I have used both Mas, and West System epoxies in the past but used a polyester resin for the simple reason the boat was built using this resin. Also the cure times when it's chilly out are much better than with the other epoxies. Again the platform height is right at the original BOOT STRIPE not the water line. The boot stripe was 3" above the old water mark on the bottom paint. I hope with the added bouyancy the bracket gives me, that I will be ok with this height when the motor and CMC jackplate is mounted on it? I noticed this weekend at the Baltimore boat show that all of the Armstrong brackets where mounted higher on the transoms so time will tell. I'll keep the pic's comming as I progress. Thanks again!
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Re: Adding Bracket to New Transom
Just some more pic's to keep ya's updated. The first coat of fairing is on and getting ready to spray with Awlgrip 545 and sprayable fairing to get the desired build. This cold weather up here is making for some long curing times??? http://i5.photobucket.com/albums/y15...I/P1300008.jpg http://i5.photobucket.com/albums/y15...I/P1300005.jpg http://i5.photobucket.com/albums/y15...I/P1300002.jpg [image] http://i5.photobucket.com/albums/y15...I/P1300004.jpg http://i5.photobucket.com/albums/y15...I/P1300007.jpg
Spent last evening sanding what you see here, and hopefully the bracket, hull and top deck will all be sprayed and ready for final sanding by the end of this weekend. Lot of fuel gonna be burned this weekend!!! |
Re: Adding Bracket to New Transom
Looks good!
A few questioins Did you through bolt it? Is the center "tub" permanently sealed? And what is the red stuff? I had some filler on my boat from an earlier repair that is that color and I just wanted to I.D. it. Thanks |
Re: Adding Bracket to New Transom
It is not thru bolted yet, once it is finished and the Jack plate is mounted, those bolts will run from the back bracket thru a 1/4 inch plate, and then thru the transom with both sides having a backing plate as well. The top of the motor box section will get a watertight access hatch to allow for the thru bolting procedure, and any internal rigging I may want to do. The brown stuff is a wood color light fairng filler mixed with the resin to make round fillets, just didn't have any micro ballons in white. Makes for easier sanding and nice smooth edges.
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Re: Adding Bracket to New Transom
That looks very good, impressive actually.
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Re: Adding Bracket to New Transom
Some new update pic's for the bracket addition, It's been cold up North here so progress has been slow, but getting there.
http://i5.photobucket.com/albums/y15...I/P1300008.jpg http://i5.photobucket.com/albums/y15...I/P3020091.jpg http://i5.photobucket.com/albums/y15...I/P3020092.jpg http://i5.photobucket.com/albums/y15...I/P3020093.jpg http://i5.photobucket.com/albums/y15...I/P3020094.jpg http://i5.photobucket.com/albums/y15...I/P3020096.jpg Fairing her out,.......getting out the waves http://i5.photobucket.com/albums/y15...I/P3020098.jpg http://i5.photobucket.com/albums/y15...I/P3020099.jpg http://i5.photobucket.com/albums/y15...I/P3020102.jpg http://i5.photobucket.com/albums/y15...I/P3020101.jpg http://i5.photobucket.com/albums/y15...I/P3020103.jpg Final coat of Awgrip Sanding Surfacer http://i5.photobucket.com/albums/y15...I/P3020107.jpg http://i5.photobucket.com/albums/y15...I/P3020100.jpg Sorry about the dust on my camera lense? http://i5.photobucket.com/albums/y15...I/P3020108.jpg Ready for 545 final prime!!! |
Re: Adding Bracket to New Transom
AWESOME job lou
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Re: Adding Bracket to New Transom
The amount of labor and love in this bracket is tremendus I've never seen a all wood wraped in glass bracket of this sort before but then again I may only have a limited perception on this, a 500# outboard is going to be a true test. Good luck sir.
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Re: Adding Bracket to New Transom
Looks good Lou. I see now that this boat is a sceptre which would explain why the waterline is a little lower then what I'm used to. The sceptres tend to have a more weight up front due to the cabin. Keep the pic's coming.
strick |
Re: Adding Bracket to New Transom
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make sure to give it a good test before you mount your motor. Maybe you can strap a pair of 55 gallon drums to the bracket and fill them with water . . . then trailer the boat around a school yard or mall parking lot with speed bumps. |
Re: Adding Bracket to New Transom
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Re: Adding Bracket to New Transom
In the true CSC spirit....strap on a keg of beer in tub
of ice and my the rounds to all your friends.... |
Re: Adding Bracket to New Transom
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Thanks for the great comments guys, I will keep the progress pic's comming. Wood??? |
Re: Adding Bracket to New Transom
Sorry about the wood comment, I restore boats for a living and I am stuck on A-C Fir Plywood ( my preferance) if properly sealed and laminated over you should have a boat for a life time, and I like the ride of a heavy wood boat! All that is irrevelant for your project becouse of weight issues,I think you made the right choice with a composit structure and layup, and as far as the glass work and all relating to finish unless somebody goes over there and pulls out a magnifying glass it looks like Top of the Line work to me. Good Job!
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