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1968 Magnum Marine 35 outboard conversion

Old 07-17-2016, 09:38 AM
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Originally Posted by chiung View Post
Yes, a house similar to yours. 2 windows front, 1 on each side, and vent hatches above.

Back will be open but will have ability to attach a rear wall/door or plastics. Also going with portable ac and genset.

My dilemmas right now is deciding on material to make the house. I like the nidacore like you used but not sure how strong it is to span about 9 feet and be able to have 3 250+ pound big boys on the roof jumping off.

Do you think 2 layers of 3/4" nidacore bonded and glassed will be strong enough?
1 1/2 nidacore would be sufficient for walking surface near 9 feet, correct fiber orientation will contribute to stiffness.
Originally Posted by Navatech View Post
Maybe 2 pieces of nidacore, both glassed and then epoxied to each other?!... Should be easy enough to do a couple of test pieces and subject to some breaking tests...
Glass in the center of the core is of little benefit in a situation like this.
I have an 8 x 8 hatch on one of my boats with an electric cylinder in the center for opening and hinges across the aft end of the hatch. It often has loads far in excess of3 men,(4 or 5 people plus cargo). It was laid up with 1.5 nidacore, 3/4 oz mat, and 10 oz cloth. This is not the place for a bias laminate but a knitted 0 / 90 would work well, you need a high density of glass with the fibers running the shortest distance across the load.
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Old 07-20-2016, 12:51 PM
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Originally Posted by commuter boats View Post
1 1/2 nidacore would be sufficient for walking surface near 9 feet, correct fiber orientation will contribute to stiffness.

Glass in the center of the core is of little benefit in a situation like this.
I have an 8 x 8 hatch on one of my boats with an electric cylinder in the center for opening and hinges across the aft end of the hatch. It often has loads far in excess of3 men,(4 or 5 people plus cargo). It was laid up with 1.5 nidacore, 3/4 oz mat, and 10 oz cloth. This is not the place for a bias laminate but a knitted 0 / 90 would work well, you need a high density of glass with the fibers running the shortest distance across the load.
Gerald
Thanks everyone - mocking up the house. This heat is unbelievable
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Old 07-23-2016, 07:13 PM
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Great rebuild!
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Old 07-24-2016, 07:45 PM
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Absolutely cool build thread man!
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Old 07-29-2016, 04:39 AM
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Originally Posted by chiung View Post
Thanks everyone - mocking up the house. This heat is unbelievable
Post a drawing before you cut a board....
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Old 07-29-2016, 05:56 AM
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old version of concept drawing:

http://www.thehulltruth.com/8420620-post7.html
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Old 07-29-2016, 06:12 AM
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Originally Posted by chiung View Post
old version of concept drawing:

http://www.thehulltruth.com/8420620-post7.html
I totally grasp the diving set up where it be tank or free.

Looks cool, given you can't stand on the outside of the cabin where the coolers are, you can actually lower the sides. The lower it sits the better it will look. Id roll or arch the top. Sides would be 2.5" shorter than the center.
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Old 07-29-2016, 06:14 AM
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Also, your rear walls could double as speargun racks. That's proven beneficial over the traditional starboard stand up racks.
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Old 08-09-2016, 05:01 PM
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subscribed
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Old 08-17-2016, 10:01 AM
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Did you have to strengthen the transom to hold the bracket? Most I/O transoms arent strong enough to hold OBs. Nice build
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Old 08-22-2016, 03:35 PM
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I saw your video on you tube and wanted to connect with you. I have a 38 fly bridge and often thought about doing this. Any info would be great. Did you have to add any structure to the transom. My hull weights 18k lbs as she sits . Did you get any performance numbers from your test run? Did she chine walk at high speed? Great project and very inspiring!!
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Old 08-22-2016, 08:20 PM
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I did not strengthen the transom. The area where the outdrives were mounted was 2 inches thick

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but that area was also scalloped/recessed

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so it was built out flat with 2 layers of 3/4" coosa, epoxy, and glass to accommodate the bracket tub

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so the bracket tub is bolted through 3.5"+ of transom, which thankfully produced nice dry sawdust when drilled.

Here are some cores - left is a small section of the center stringer I notched for a brace for the fuel tanks, next is gunnel top for rod/cupholer, then a core of the transom above the bracket for the rigging tubes, and another gunnel core for a 15 degree rodholder.

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Old 08-22-2016, 08:38 PM
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I've been slowly rigging. Both fuel tanks are in and plumbed, both 40 gallon water tanks are in and plumbed, batteries (hopefully) permanently mounted. Fuel/water fills, rod and cupholders in. Fuel tanks and fills grounded, house and start batteries grounded together. Blue Sea breaker strip installed. Speakers/sub/amps/source hooked up so I can listen to music as I work. 18 tank holders mounted. 2 analog fuel gauges mounted and calibrated the centroid senders. Messing around with the helm and mounting Simrads. Need to run auxiliary charging leads from motors to house bank. Need to add some additional bracing for fuel tanks. Waiting on an enclosure to mount the 3 start battery switches.

Want to load her up with water, fuel, 18+ steel scuba tanks, 6 batteries total and see how she sits so I can decide where to put the thru-hulls for the bilge pumps.

I think I'm a few months away from any meaningful test runs - still have motor height and props to mess with after getting house built on her. Also have to get her surveyed and insured, and a proper trailer.
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Old 08-24-2016, 07:12 PM
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Awesome build. I talked with Armstong and they told me it was no big deal to build the bracket. I will be on the boat Labor day and will get them the angles etc. Are you mounting you middle engine deeper or buying a longer shaft for that motor?
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Old 08-24-2016, 07:18 PM
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You should check out the house design on the fly bridge version of the 35 and 38. The lines rally compliment the hull.
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Old 08-26-2016, 09:44 PM
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looking good so far.
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Old 08-31-2016, 09:11 AM
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I have been watching your build and have been motivated by your progress to finally get working on my 35 Magnum. Once I learn how to use the site I will subscribe to your build thread. Keep up the good work!
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Old 09-01-2016, 03:03 PM
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Originally Posted by Something Serious View Post
I have been watching your build and have been motivated by your progress to finally get working on my 35 Magnum. Once I learn how to use the site I will subscribe to your build thread. Keep up the good work!
once you reply then you are subscribed. click "usercp" left most on the blue stripe and it will show you if there are new replies to any thread you have commented on.
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Old 09-14-2016, 09:44 PM
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I'm thinking an update is in order.
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Old 09-15-2016, 12:53 PM
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I just ordered trip 300 Yamaha's for my 35 Express. Mine has Crusader 454 model 350's with Walter V-Drives. They weigh right at 2500 LB for the pair. The Yamaha's are just over 500 each. She should level out fine moving the lighter weight back. I'll post picks as I go.

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