More transom problems, need some advice

[GT1000000]

Re: More transom problems, need some advice

My understanding of this long shaft, short shaft, etc. is that you are right on the money...Generally speaking a 18-23 inch transom, equals a 20 inch shaft, a 15-18 inch transom equals a short shaft of 15 inches and a 23-28 inch transom equates to a 25 inch shaft...or so I have read...so, you should be fine, also, if I am not mistaken...you can drill the motor mount bracket holes little up or a little down, to get your cavitation plate, pretty much even with the planing part of the hull...I don't think a centimeter is going to make that much difference, unless of course you are racing, in which case, micro millimeters start to come into play...and the expense starts to climb exponentially...Hahaha...

If you don't hear from one of the more knowledgeable guys soon, send oops! a PM and he will help you decipher this out...

 

[GT1000000]

Re: More transom problems, need some advice

Just finished looking at the pictures...very nice work, should be solid as a rock!

By the way do you have available "Photobucket"?

If you do, you can have your pictures come up right in your posts...

 

[zymox]

Re: More transom problems, need some advice

Thanks for your info GT
I'll do that if I don't here from him again in a while.
The measures I took seems to be what I want so I tried to mount my cap today just for fun and to be able to measure the total but guess what - It doesn't fit anymore, the space from the outer edge to the tub was to narrow so I had to cut it open just to get it over the transom. I will have to rebuild it again when I'm done with the transom. This will allow me to make it a snugger fit than it was from the beginning.

About the adjusting I said the same thing the other day when I discussed the motor with a friend of mine and he stated that the L shaped hanger has to be resting on the transom? If so I'm not sure if I can adjust it as I would like to be able to.

 

[Woodonglass]

Re: More transom problems, need some advice

Here's how to determine the correct transom height for your boat/motor...

 

[GT1000000]

Re: More transom problems, need some advice

Well, right or wrong, my boat has a long shaft motor on a short transom, and the motor bracket hook sits approximately 3-4 inches above the top edge of the transom...it seemed to be just fine and that was with a ROTTEN transom, deck and stringers...Before I started on the restoration...now when everything is rebuilt to better than factory strength, I see absolutely no problem with this set-up...

Like I said it may not be the recommended way to mount an engine, but for my situation, it will have to be, because I have no immediate plans to get another...plus I really like my 115 horse Tower of Power...

Yeah, and I'm sorry to hear about the fitment problem with the cap, but i don't remember if in the beginning of your restoration, any mention was made as to properly supporting the hull/tub, to keep it from flexing out of shape...

Oh well, you can take care of a minor thing like cutting it apart and repairing it to fit, after all you have accomplished by now...

Regards,
GT

 

[zymox]

Re: More transom problems, need some advice

Thanks Wood
That's how I did the measurements. I will try to do it a bit closer ones I've done the transom and then before I seal it I will make sure the height is the correct one.

 

[zymox]

Re: More transom problems, need some advice

Hehe, oh yeah I was told. "Do it exactly as you find it if you want your cap to fit." I have to blame no one than my self for this.
I'm enormously grateful for all the help I've got from you guys. Even my wife has started to help out now looking forward to the summer days on the sea.

I don't have photobucket since my username is allready taken. I use my own space.
I think I can solve the pictures in another way, have to adjust the size first.

 

[zymox]

Re: More transom problems, need some advice

Good evening M8's

To morrow I will do the rest of my transom lamination but I got a question that I really can't find any answer for and soon it will be time to do the stringer mods. Is there any point in doing a couple of thin stringers to each side of the hull to countervail the torque?

 

[GT1000000]

Re: More transom problems, need some advice

Not sure what you mean about the anti-torque stringers, but I would imagine that the sacrificial anode, that is shaped like a little fin on the cavitation plate, could be used to counter act some of the engine torque...

I do not think that any additional stringers are really goin to make any difference in the torque the engine imparts on the hull, however, I am fairly new to all this boating stuff and could be wrong...Maybe fire off a PM to either oops! or Bond-o or Wood...they might have some insight as to this...

 

[Woodonglass]

Re: More transom problems, need some advice

What HP is your Motor? and what Length is your boat?

 

[Decker83]

Re: More transom problems, need some advice

Just found your thread today.
Your glass work looks excellent.
Just wanted to say Hey.
Keep it up.

 

[zymox]

Re: More transom problems, need some advice

Not sure what you mean about the anti-torque stringers, but I would imagine that the sacrificial anode, that is shaped like a little fin on the cavitation plate, could be used to counter act some of the engine torque...

I do not think that any additional stringers are really goin to make any difference in the torque the engine imparts on the hull, however, I am fairly new to all this boating stuff and could be wrong...Maybe fire off a PM to either oops! or Bond-o or Wood...they might have some insight as to this...

I just got a strange thought that if I have a twisting force on the transom due to the torque from the motor it could perhaps do something good to build in some "knees" to the sides of the hull like the knees I will do from from the bottom of the hull up against the transom.

 

[zymox]

Re: More transom problems, need some advice

What HP is your Motor? and what Length is your boat?

HP=140, -88 Evinrude V4
Length of the boat=approx. 20 feet. (6 meters)

 

[zymox]

Re: More transom problems, need some advice

Just found your thread today.
Your glass work looks excellent.
Just wanted to say Hey.
Keep it up.

Thank you for your kind words sir.

 

[GT1000000]

Re: More transom problems, need some advice

I just got a strange thought that if I have a twisting force on the transom due to the torque from the motor it could perhaps do something good to build in some "knees" to the sides of the hull like the knees I will do from from the bottom of the hull up against the transom.

Oh OK, You mean something like what my angled transom bass boat has

I wonder if it would be of any good use, since my understanding of this design is to spread the force of the engine out to the sides of the boat, because of the angled transom design...Hmmmm?

It would be interesting to find out from somebody who knows for sure, if this actually helps in providing torsional stability or strength...

 

[zymox]

Re: More transom problems, need some advice

What a nice wood work you have done on yours. That's exactly what I mean sir

Now that I see your picture I think it will maybe be to solid if I do it like yours. I can imagine that it would be so stiff that if it can't flex or twist a tiny bit and that will probably crack it in some weaker spot instead so I may be better off not doing that.

Also my stringer where totally hollow and it doesn't seems to ever have been any wood inside them. Probably I do mine nearly the same using some floor isolation foam to get the shape and then laminate over it. It kind of looks like they took a 2 by 4 inch plank and then pulled it out when the laminate was hardened.

 

[zymox]

Re: More transom problems, need some advice

update for now and more to come tonight when I will have this one done or at least almost.

After a light grinding, vacuuming and several cleaning with a lot of acetone to prep the surface.

Dryfitting 2nd layer and checking for at least a 2 inch overlap and again for this layer 1st csm then a layer of roving.

An important message for the next owner if there will be any.

Done and rolled out of air, looking closely you can see the 2 inch overlap. The acetone wiped of the mess. Had to rewrite it again...

Only one more tabbing to do and then a couple of sealing layers with csm and the leftovers from the roving then I consider this one to be DONE!

 

[zymox]

Re: More transom problems, need some advice

Hello guys!
It's time to call out the beer and to celebrate since I now consider this transom DONE! and If I'm allowed to say it my self I'm very very pleased. Some pictures of the final result, still wet though.

Laminate thickness before the last sealing and reinforcement layer is done.

Here you can see how the laminate goes from thicker to thinner since you add your layers from the center and out, overlapping.

The laminate vs fillet(PB) and the outer skin.

This how I made my tabbing layers. Started with the inner layer for 4 inch. every tab except the last one is 1 layer of CSM 450gram + 1 layer 300 gram Roving.

Here is the final result,still wet. With a total of 2 csm & roving layers added to reinforce the rest of the transom and last 1 huge layer of csm to seal it all from water. All of it cut to overlap in the corners and to make it shape to the hull. If I've done my math right we now have 7 layers glass in the tabs and the innermost corners contains 15 layers due to the overlap. This also goes for the part above the keel? since I had to cut and overlap here also the get a good touch with the hull.

 

[GT1000000]

Re: More transom problems, need some advice

That Sir, is absolutely one of the best transom jobs I have seen to date!

You have officially BLOWN past me and I am in AWE!

Fantastic workmanship...if the rest of your boat is done to this immensely high standard, you will have a boat that could easily become an example of how to do a restoration the best possible way!

Congratulations and beers all around!!!

 

[zymox]

Re: More transom problems, need some advice

Thank you very much for those kind words Sir.

My intention is to do a good job on the transom and the stringers for now following all of the advice I get here including yours and try to do the rest on the fly. I have about three month until it's summer and during this time my work also demands plenty of time from me so we have to see how it goes.

Anyhow, this words of your's for sure will make me continue this ride until the end and with the hand on my heart it's me that should say thanks to you, Woodonglass, Oops!, Ondarvr and all the other guys who is helping me out on this.
I'm tremendously grateful for all your time and effort you spend in me and all my crazy/stupid questions so let me say, Thank you Sir.