Donzi Magnum TUNNEL HULL

chconger

Petty Officer 1st Class
Joined
Jul 3, 2012
Messages
315
Looking at the brochure picture again. It looks like the transom was wood to the outside by design.

If so; No previous owner cut off the fiberglass transom...there never was any. You have a complete, original, molding there!
 
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MTboatguy

Fleet Admiral
Joined
Jul 8, 2010
Messages
8,988
Looking at the brochure picture again. It looks like the transom was wood to the outside by design.

If so; No previous owner cut off the fiberglass transom...there never was any. You have a complete, original, molding there!

No, not correct, the Donzi Magnum had a fiberglass cover on it, there were quite a few different tunnels back in those days and different boat companies did different things with them, but I remember them very well and the majority of them had the fiberglass cover over the transom.

Donzi was not the only company making the Magnum Tunnel Hull, if you look through this google image link, you will see many different versions of the Magnum, I remember only one that didn't have the fiberglass cover and the transom was not plywood, it was mahogany and only lasted about 1 year. It had many coats of varnish on it and had to be re-finished about once every 6 months if it was actually being used.

https://www.google.com/search?q=Donz...miVXUaBzOKM%3A

To be honest with you, I am actually starting to wonder if this is a Donzi Hull, it is starting to look a lot more like the Glastron Molinari 2 + 2 Sport Runabout to me, but I could be wrong, the one in the posted advertisement really looks a lot like the '68 Brunswick Mercury Magnum Missile Tunnel with that outside mounted throttle control.

But like I said, there was a period of about 20 years, those style of tunnel hulls were real popular, the first one I ever drove when I was around 16 or 17 was a Cougar Tunnel with a really hopped up Ford 427 SOHC motor in it, which was the same motor that many of the NASCAR teams were running at that time.

In fact if I remember correctly and if I am wrong I am sorry, it was 40 years ago, Popular Science or Popular Mechanics sold the plans for the Magnum Tunnel Hull in about 1972 or 73 so you could build a version of this boat at home, kit boats were really popular back in those days and the Magnum Tunnel was one of the leaders of the pack.

This thread is starting to make me feel really old!
 
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NYGiants

Chief Petty Officer
Joined
May 3, 2009
Messages
582
This is actually a copy of the Magnum missile, its called a Rabco Hustler. These apparently had a high tendency to blow over because of how light they were. Any advice on how to beef up these boats and possibly prevent blowovers?
 

MTboatguy

Fleet Admiral
Joined
Jul 8, 2010
Messages
8,988
Tunnel hulls by design are subject to blowover, lightweight, air gets under in the tunnel and then they go over, when I was working around the Unlimited Hydroplanes back in the day, they would actually add weight to the front of the boats in the forward portion of the pontoons to try and keep them from going over. It is just one of those things, you might do some research on preventing blowover, there are a lot of factors to them going over, speed, wind, water conditions, etc. I have lost two good friends that ran Unlimited Hydroplanes because of blowovers.
 

NYGiants

Chief Petty Officer
Joined
May 3, 2009
Messages
582
Ok im about to have the cap split, how much fiberglass mat and resign should i buy? I need to do the floor and the caps core and transom
 
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