Sears 1436 Build

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Drothgeb
Posts: 13
Joined: 22 May 2017, 07:38
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Sears 1436 Build

Post by Drothgeb »

I’ve been working on my boat for a while, just thought I’d post a few pics. It’s my dad’s 50 yr old Sears jon boat I’m setting up with a platform, stick steering, sponsons and etc.

The sponsons give me an additional 150lb of bouyancy/flotation in addition to 9” more width for more stability. I’m also adding more foam for added flotation. I also added some extra bracing and beefed up the transom for a bigger motor.
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thedude
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Joined: 22 Feb 2018, 21:36
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Sears 1436 Build

Post by thedude »

Love a good stick steer on a small boat. Did you fab the sponsons yourself? Those turned out great!

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Drothgeb
Posts: 13
Joined: 22 May 2017, 07:38
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Sears 1436 Build

Post by Drothgeb »

Yeah, I already had a box/pan brake. So I used sheets of .063 aluminum, formed them in 3 foot sections and tig welded them together.
1D0BE804-964C-4628-BD11-5AD7694B629A.jpeg
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TMO8853
Posts: 52
Joined: 20 Mar 2018, 22:15
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Sears 1436 Build

Post by TMO8853 »

This is a cool build and great fab skills. Keep us updated as you progress. I’m also fishing out of a 50 yearold 1436 that I’ve completely redone and really curious how your sponsons are going to turn out on the water as far as adding stability.

WINGO-LINGO
Posts: 17
Joined: 05 Sep 2019, 10:27

Sears 1436 Build

Post by WINGO-LINGO »

Partner, I have this exact boat. Same drain plug arrangement/cover, and the Sears tag hanging on by one rivet.

I registered to be a member here, when I saw your' project. I bought the boat in the 70's when I was fifteen. I'm 55 now.

Long story shorter, you have inspired me to rebuild it, starting with transom. What materials did you use on transom?

You got it going good. Keep up the good work!

Drothgeb
Posts: 13
Joined: 22 May 2017, 07:38
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Sears 1436 Build

Post by Drothgeb »

I used layers of 1/2” pressure treated plywood for the transom (I let the plywood dry out for about 6 months before using it). The plywood and the boat aluminum were coated with epoxy primer before installing it. Three layers fit where the original piece of wood was, then I sandwiched another layer on the outside. To keep the weight down, I cut out some of the center layer of plywood and replaced it with 1/2” foam. The finished transom ended up weighing just over 20lbs.
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Drothgeb
Posts: 13
Joined: 22 May 2017, 07:38
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Sears 1436 Build

Post by Drothgeb »

I got more done on boat this week. Bought batteries and a battery charger, then got started on wiring. Two group 29 batteries for power. Running 2 60a circuits for a front and rear trolling motor, and a 30a circuit to a small breaker panel for misc elec. Also worked on a bow mount for the trolling motor and anchor roller.
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Elkins45
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Joined: 06 Jan 2019, 01:43
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Sears 1436 Build

Post by Elkins45 »

I have the same boat from 1967. It hasn't been on the water in 20 years but I still pay the property tax on it every year. The transom needs to be replaced on mine as well. I love the mods you have done and look forward to seeing some photos when you have it finished. I'm fascinated to find out how the sponsons perform on the water.

Pector55
Posts: 48
Joined: 09 Sep 2019, 09:09

Sears 1436 Build

Post by Pector55 »

This is fantastic. I love seeing the way you set up all your storage and decking. I'm in the process of doing mine as well. Did you etch yours out on paper first? napkin? computer software? or just wing it?

Drothgeb
Posts: 13
Joined: 22 May 2017, 07:38
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Sears 1436 Build

Post by Drothgeb »

I’m just designing as I go.

This week I set pvc pipe for wire and cable chases, and started pouring foam. Filled the sponsons and some of the cavities in the boat, 8 cu ft in all. Poured most of it with 2 part foam, then topped it off with spray foam.
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WINGO-LINGO
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Joined: 05 Sep 2019, 10:27

Sears 1436 Build

Post by WINGO-LINGO »

Very interesting. Those sponsoons blew my mind. We have bayou type conditions here. Thought it was some kind of hydrofoil at first. I commented earlier about having the exact same boat, Sears, 1969 model with the hole in bottom instead of lower rear. Mine has no HIN# because it was fabricated before they were required. Got a warning at the boat ramp a couple weekends ago.

What do the sponsoons do ?

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LDUBS
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Location: Clayton California

Sears 1436 Build

Post by LDUBS »

Drothgeb wrote:
26 Sep 2019, 21:46
I’m just designing as I go.

This week I set pvc pipe for wire and cable chases, and started pouring foam. Filled the sponsons and some of the cavities in the boat, 8 cu ft in all. Poured most of it with 2 part foam, then topped it off with spray foam.
I'm really looking forward to hearing how the boat rides with those sponsons. I see that you filled them with foam. Are they water tight?
Have Rod - Will Fish

Drothgeb
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Joined: 22 May 2017, 07:38
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Sears 1436 Build

Post by Drothgeb »

WINGO-LINGO wrote:
04 Oct 2019, 14:11
Very interesting. Those sponsoons blew my mind. We have bayou type conditions here. Thought it was some kind of hydrofoil at first. I commented earlier about having the exact same boat, Sears, 1969 model with the hole in bottom instead of lower rear. Mine has no HIN# because it was fabricated before they were required. Got a warning at the boat ramp a couple weekends ago.

What do the sponsoons do ?
I’ve added about 150lbs to the boat, the sponsons add 150lbs of buoyancy to somewhat compensate. They also add 9” of width to the boat for better stability. I plan on flyfishing from the bow, so I wanted as much stability as I could get.

They look like hydrofoils due to some of the lakes around requiring 18” gunwales. Mine were only 15 1/2”, so I extended down far enough to meet the minimum. Most of my use will be on electric only lakes, so they won’t have much of an effect at 3 mph. But I do have a 25 hp outboard for trips on the river. Not sure if that’s enough to get some hydrofoil action or not.

Drothgeb
Posts: 13
Joined: 22 May 2017, 07:38
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Sears 1436 Build

Post by Drothgeb »

LDUBS wrote:
04 Oct 2019, 20:14
Drothgeb wrote:
26 Sep 2019, 21:46
I’m just designing as I go.

This week I set pvc pipe for wire and cable chases, and started pouring foam. Filled the sponsons and some of the cavities in the boat, 8 cu ft in all. Poured most of it with 2 part foam, then topped it off with spray foam.
I'm really looking forward to hearing how the boat rides with those sponsons. I see that you filled them with foam. Are they water tight?
They should be watertight. I was on the fence about filling them with foam. But the river has lots of rocks, and I have knocked a couple of holes in boat over the years. Finally decided if I knocked a hole in one of the sponsons and it filled with water on the river, it would be bad.

WINGO-LINGO
Posts: 17
Joined: 05 Sep 2019, 10:27

Sears 1436 Build

Post by WINGO-LINGO »

Okay, makes sense now. Got that same 15-1/2" measure on my Sears. I use a short foot Mercury 9.9 in water about 1.5 - 5ft depending on lake level.