1969 Larson - Big Project

[avpaulb]

Re: 1969 Larson - Big Project

How about this... I just found a guy selling basically this exact same boat not far from me with a 75HP Evenrude. He mentions that the motor needs some TLC, but...

I wonder if 75 would be a bit much for this little dingy? Heck, it's only 15 ft.

 

[Yacht Dr.]

Re: 1969 Larson - Big Project

Will do, thanks Wood.

I think my plan of attack is going to be to glass it from the inside first, then fill from the outside. Still working on the logistics in my head, but any thoughts are always welcome.

There is a good video on Youtube that I'm probably going to replicate:

1. Grind out the hole a bit, probably with my Dremmel, towards the inside of the hull
2. Attach some reinforced wax paper to the outside of the hull to cover the hole
3. Patch the hole from the inside with probably 3-4 layers of CSM

Should creat a nice smooth surface on the outside of the hole with minimal filling required.

Bah..I saw that vid too... Im not impressed.

Prep the inside like 4-5" round. then Grind/dish a bit on the outside enough for about 4 layers of glass circles .. duct tape the inside..go back to the outside and fill the hole flush with your dish out with some tiger hair ( cabosil, chopped mat and resin ) .. layup your 4 layers of glass circles ( torn..not cut ) .. roll it out flush with a bubble roller..go back to the inside as soon as you feel the 'tiger hair' gellin up by slightly pushing on the duct tape take the tape off and apply a few layers of 1708.

Minimal fairing on the glass and some skim coat of putty on the outside

YD.

 

[Willyclay]

Re: 1969 Larson - Big Project

I wonder if 75 would be a bit much for this little dingy? Heck, it's only 15 ft.

I got so preoccupied with the transom height issue that I missed the fact your boat is only 15ft long. FYI, I ran a 1962 V-4 Johnson 75 on my Glastron V-153 (15ft-3in.) but it was rated for 90HP max. Prior to that, I had a 1959 Johnson 35 on the same boat and it was not bad even with three adults aboard. Maybe after you remove all the wet foam and wood, your 25 will do better. Good luck!

 

[avpaulb]

Re: 1969 Larson - Big Project

I think I've got what you are getting at... I'm going to get back to you with some questions after I stew on it overnight.

Bah..I saw that vid too... Im not impressed.

Prep the inside like 4-5" round. then Grind/dish a bit on the outside enough for about 4 layers of glass circles .. duct tape the inside..go back to the outside and fill the hole flush with your dish out with some tiger hair ( cabosil, chopped mat and resin ) .. layup your 4 layers of glass circles ( torn..not cut ) .. roll it out flush with a bubble roller..go back to the inside as soon as you feel the 'tiger hair' gellin up by slightly pushing on the duct tape take the tape off and apply a few layers of 1708.

Minimal fairing on the glass and some skim coat of putty on the outside

YD.

 

[avpaulb]

Re: 1969 Larson - Big Project

Well, some may recall my originally very scratched underbelly.

A before and after:





A big improvement, for certain. Thanks to those who advised on some of the removal. I'm going to attack some more of the superficial scratches tomorrow to see if they come out.

The plan afterwards is to do some fiberglass filling on the major gouges using with a PB recipe, minor scratches with a combo of resin and 3M glass bubbles. Just need some warmer weather (rather than snow) to heat up my workspace!

Once the repairs are done, sanded, and faired, the plan is to do some additional gelcoating. Reason? After all of the sanding that has been done, there are certainly some spots that are getting quite thin, if not see through. Then the intent is to go through the process of painting.

No luck so far selling the old motor... so this project is going to hit a brick wall here in about a week. Wish me luck on that front!

 

[Woodonglass]

Re: 1969 Larson - Big Project

So which is it...? R U going to Gelcoat the hull or Paint it? If you gelcoat the entire hull you will NOT need to paint it. Gelcoat goes on 20 mils thick and is Hard as Nails. If you have parts of the hull that are thin to the point that they flex and are transparent then you should apply extra layers of glass on the inside of the hull to reinforce those areas.

 

[avpaulb]

Re: 1969 Larson - Big Project

And the survey says...

Gelcoating the bottom between the chines. Painting from there up. Above the chines there are no major dings to repair, just a couple of minor scratches. The cap is in similar condition. I'm going to paint the exterior above the chines white, and repaint the decal a different color, as well as the cap. Going this route will allow me to fix the bottom of the hull and quickly start modifying my homemade stand to allow me to flip the boat back over.

There are a couple of spots inside the hull with a bit of flex that I suspect will resolve itself when I dive into the transom, stringer, deck replacement later. The thought had crossed my mind to put a couple glass layers over the entire interior of the hull. The boat is small enough that it wouldn't be too drastic of an investment. But, I'll be putting so much glass over the stringer system it should really bolster things.

But as I mentioned, other than sanding out scratches, I'm in a holding pattern until my materials arrive. So, any thoughts are welcome.

 

[avpaulb]

Re: 1969 Larson - Big Project

Time to go add to the "Boat Project Wall of Shame". (Explanation later)

Have a good Memorial Day all! No boating or camping here... snow. Super.

 

[avpaulb]

Re: 1969 Larson - Big Project

MORE SANDING. Super.

Well, I'm about as ground down as I can possible get I think. No more scratches, a few more found holes, and a bunch of filling to do. Lovely hole found underneath the "poorly done repair" section:



But otherwise, good progress.



OH, and the Boat Project Wall of Shame:

 

[avpaulb]

Re: 1969 Larson - Big Project

My stringer plan... thoughts?

 

[avpaulb]

Re: 1969 Larson - Big Project

Waiting for supplies is painful.

Maybe I'll engineer a rope and pully system to lift and flip the boat by myself...

Or maybe I'll just do a guys night out. Hmm.

Future thoughts for down the road: I'd like to be able to add some gauges to this thing, in particular speedo, tach, voltage. Just some basics. Ideas or a parts list would be welcomed!

 

[avpaulb]

Re: 1969 Larson - Big Project

Finally... I have supplies! Time to start some patching of holes found when sanding! I'm going to be trying out a technique recommended by Yacht Dr. for repairing the larger hole I found (in pics).

Once I get the boat flipped back over and start on some actual work... I'll post some pics!

 

[avpaulb]

Re: 1969 Larson - Big Project

I'm getting set to start repairs on some of my holes (and saw slips) on the hull.

Picked up some 3M fiberglass resin at the local DEPOT. Knowing 3M, I'm sure it's a fine product... I just can't tell if it is waxed or not. Anyone have a clue? Does it even really matter?

 

[avpaulb]

Re: 1969 Larson - Big Project

Think I just answered my own question... thanks Fiberglass Information Thread.

I will sand and acetone between layers.

 

[Yacht Dr.]

Re: 1969 Larson - Big Project

Think I just answered my own question... thanks Fiberglass Information Thread.

I will sand and acetone between layers.

You mean applications..not layers right

You can put 3 or 4 layers in on application..let kick..sand acetone wipe..and go again .

YD.

 

[Woodonglass]

Re: 1969 Larson - Big Project

Did you get the Mat and the Cloth? The mat is usually only .75 oz not the recommended 1.5oz. The Cloth is only 6oz sooo.... you'll need at least 2 layers of each if you want it to be strong. As YD says, you can lay two layers of CSM and two layers of cloth all at the same time so you don't have to sand and acetone before the next layer.

 

[avpaulb]

Re: 1969 Larson - Big Project

Thanks Wood and Yacht...

I had a bunch of 1.5 oz mat laying around... good to go there. And everything wood has suggested I did.

I would mention in regards to my 3M post, it is definitely waxed. Seems to work quite well though. For anyone else who is going to use it... if you follow 3M's directions for hardener, and you are working above 70 degrees... it sets up REALLY fast. Hard as a rock in about a half hour. Good product, but tone down the hardener.

Did you get the Mat and the Cloth? The mat is usually only .75 oz not the recommended 1.5oz. The Cloth is only 6oz sooo.... you'll need at least 2 layers of each if you want it to be strong. As YD says, you can lay two layers of CSM and two layers of cloth all at the same time so you don't have to sand and acetone before the next layer.

 

[avpaulb]

Re: 1969 Larson - Big Project

Thanks to Yacht for your 3M bubbles suggestion. I did quite a bit of scratch filling using a combo of the bubbles, resin and cabosil. Works like a champ!

I'm going to have quite a bit of sanding and fairing to do, but it should work out quite nicely.

I'll be posting some before and afters when I have light again!

 

[avpaulb]

Re: 1969 Larson - Big Project

More hole and scratch filling done today! Decided on using 3 layers of CSM and 2 of cloth to fix all the cuts and holes in the hull. Turned out great! Solid as a rock!





Next step on those will be to fill from the underside. The dash had numerous holes that need to be filled. I've started with some CSM from behind to back the holes for filling...



Also filled, sanded and faired some scratches on the cap. Still have some sanding to do with a finer grit, but it turned out nicely.





More to come of course. I have plenty of miscellaneous screw holes that are no longer needed to fill, as well as the dash. I'm also going to grind out more from underneath the cap in preparation for the deck and stringers down the road. More to come!

 

[avpaulb]

Re: 1969 Larson - Big Project

Hey Woody, how about this one:

http://www.ebay.com/itm/110890318722?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

I have that Motor's cousin a 1962 40 HP Evinrude. Just like the Johnson it is also an Electric shift. The thing about electric shifts is...They're great as long as the servo's and the solenoids and the switches are in good working condition. If not, parts are VERY difficult to find IF you can find them at all. Luckily mine were all PERFECT. My 40 hp is for sure a Little less Hp than I would like for my 15 foot boat but it does push her along at about 25 mph with 500lbs of passengers aboard. If it were me I'd be looking for a 65 to 70 hp motor. If you need advice on fixing that hole just ask.