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1968 Magnum Marine 35 outboard conversion

Old 11-11-2015, 11:19 AM
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Default 1968 Magnum Marine 35 outboard conversion

This hull was a project that had a lot of work into it when I picked it up. It's a 1968 Magnum Marine 35. I got it completely stripped of all wiring/plumbing/fittings but did pick up many boxes of stuff.

The hull was built by Don Aronow, who was also behind Cigarette, Donzi, and Formula. Unfortunately, he was shot and killed: http://espn.go.com/30for30/film?page...r-of-donaronow

It sat in my yard most of the summer with very little physical progress mostly due the the heat and rain. I did a lot of thinking and planning and picked up a few support items such as steering rams/helm etc. and did some prep work on the fuel tanks to convert them from diesel to gas use. I finally got inspired by Jaizzen's Fountain thread - http://www.thehulltruth.com/boating-...-10-meter.html - and picked up a canopy and so the last month has seen more work.

Last edited by chiung; 11-11-2015 at 11:45 AM.
Old 11-11-2015, 11:42 AM
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Here are a few pictures of other examples of this boat:

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Old 11-11-2015, 11:55 AM
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Here are some pictures of her from the previous owner:

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Old 11-11-2015, 11:57 AM
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Here are pictures from picking her up:

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Old 11-11-2015, 11:59 AM
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And this is yesterday. When I have time I'll post up the pictures I have of us getting to this point, as well as going forward. Thanks for looking and helping.

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Old 11-11-2015, 12:00 PM
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wow what a project,
the stories this boat could tell
Old 11-11-2015, 12:01 PM
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Oh, this is a concept I sketched out when I got her. The boat will be set up for diving.

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Old 11-11-2015, 01:10 PM
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Nice hull & cool project! Looking forward to seeing it come together.
Old 11-11-2015, 02:11 PM
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Big boat!

Like it.
Old 11-11-2015, 06:29 PM
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Sub'd
Old 11-11-2015, 06:43 PM
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I was wondering when we would see an update on the project. Its gonna be a beast. No need to even check the weather report before going out.
Old 11-13-2015, 07:06 PM
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The boat is going to be finished in stages. First stage is getting her powered just to see how she runs and sits in the water. Thinking hard about DF300's from a forum sponsor. If all works out after test runs we will continue with the build.

With that in mind I went down to Armstrong in Stuart with a template for the bracket. That design should be finalized next week, with about a month for production.

In the meantime I plan to get the hydraulic steering hoses made and installed, as well as the helm/cylinders I already bought.

For fuel I would like to test run her on portable tanks and account for the weight and balance issues maybe by placing some 50 gallon drums on board and filling them with water. The permanent tanks are 2x108 gallons which can be moved forward or aft to some degree.

For starting batteries I'll also rig them up temporarily near the transom. They will eventually be in the cabin but I don't want to invest a few hundred in long thick cable runs just yet.

I decided to paint the hull and bottom as a way to keep me motivated - it will be hard for me not to finish her if she's looking pretty. Going with blue tone white Awlcraft hullsides and white VC Performance over Interprotect bottom.

Here are some stringer/below deck pictures:
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Old 11-13-2015, 07:07 PM
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The boat has a center stringer, which is presenting me with a problem for the bilge drain, I think I'll have to put in 2 thru-hull drains, one on each side of the center stringer. Our current 29 twin boat has one and it works fine. My concern is whether 2 of these close to the centerline will cause turbulence affecting the center motor?
Old 11-14-2015, 06:11 AM
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Very nice. Love the lines of Magnum Marine boats. Can't wait to see the finished pictures with the enclosed hardtop. Regards, Glen
Old 11-24-2015, 03:47 PM
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Originally Posted by chiung View Post
The boat has a center stringer, which is presenting me with a problem for the bilge drain, I think I'll have to put in 2 thru-hull drains, one on each side of the center stringer. Our current 29 twin boat has one and it works fine. My concern is whether 2 of these close to the centerline will cause turbulence affecting the center motor?
Just run 2 flush mount drains, one on each side. It's not worth citing out the stringer and building it up. You've got it right in my opinion.
Old 11-24-2015, 03:57 PM
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What is the grey coating on the tanks?
Old 11-25-2015, 11:58 AM
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Originally Posted by gofastsandman View Post
What is the grey coating on the tanks?
I'm not sure - it was coated when I got the boats. My guess is some sort of epoxy paint. It's on there good.

I took them out and had the lower drain plugs and threaded fills welded shut and had fill elbows welded on. A lot of the fuel supply and return fittings are capped off now also. Each tank now has a fill elbow, a vent elbow, a supply, and sender.

The tanks have what appear to be strips of PVC/Azek adhered to the bottoms, which should keep the tanks from being in contact with moisture. For the time being I plan on tabbing bulkheads fore and aft of the tanks to keep them tight. Once we get the balance of the boat figured out we'll slide tanks forward or back as needed and glass the bulkheads in permanently and fab fishboxes with the space that's left.

Here are pictures before welding and capping.

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And here are how they sat in the boat:

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In the foreground of this picture you can see the angled and flat pads that the tanks sat on. In the background is a flat shelf that I may remove and also make angled and flat pads to slide the tanks forward to if weight distribution is better.

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Old 11-25-2015, 11:59 AM
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Originally Posted by Jaizzen View Post
Just run 2 flush mount drains, one on each side. It's not worth citing out the stringer and building it up. You've got it right in my opinion.
Thanks - draining out the bottom?
Old 11-25-2015, 02:24 PM
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Default I would start with the tanks forward as far as possible.

How many OBs? That boat is wide enough for 6 probably. at least 3 engines I hope?
I would also go 30 inch shafts and a Hydraulic lift plates. If not the engines could end up under water in a following sea off plane.

Is that cockpit floor already lower then the factory height.? It looks it. They did not have much standing freeboard when they had Big V 8s and V drives against the transom.

With the fuel forward it will give it a better ride when running off shore with tanks full, Then lighten for the ride home.
Old 11-25-2015, 04:20 PM
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Originally Posted by chiung View Post
Thanks - draining out the bottom?
Drain them through the transom. Just one one each side below your bracket. It's hard from the pics to tell what I'm seeing. Anyway to take you layout drawing and pencil in the fuel tanks. Also, twin 108's, if that's what your going with isn't much fuel given the hull weight your dealing with. Big boat big fuel. I had 265useable in my Cary and needed it, and this boat is heavier.

Do love this hull.

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