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Old Apr 29, 2012, 09:37 AM
Registered User
United States, TX, La Porte
Joined Apr 2007
1,642 Posts
Build Log
Late War PT Boat

I decided to start building my Dumas 48" PT Boat. I've had the kit for many years and as everyone knows Dumas does not produce fiberglass hulls anymore. I'm not sure how many people still have this kit or could benefit from a build log about it. But, just in case there might be some interest I decided to start this thread. I will be using additional parts provided by Mosquito Boat Hobbies to convert the early war PT 109 to a late war PT 596. I will be using triple motors by Mack Products. I will also be using their drive train parts. Because of weight considerations I will be taking steps to make the boat as light as possible. The addition of a number of resign parts for the late war conversion make this necessary. I will try to keep track of the weight savings as I build the kit. OK, lets get started.
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Old Apr 29, 2012, 10:09 AM
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marter1229's Avatar
United States, ID, CDA
Joined Aug 2005
597 Posts

I'll be watching. Hope I learn some good building techniques, cause mine have been slipping.
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Old Apr 29, 2012, 11:34 AM
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United States, CT, Wethersfield
Joined Mar 2006
1,079 Posts
I think you will really enjoy the build. I have an order in for the Higgens boat.
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Old Apr 29, 2012, 11:36 AM
Grumpa Tom
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United States, CA, Los Angeles
Joined Sep 2003
22,797 Posts
Wow, all that building is just for the deck? Which then attaches to the fiberglass hull?
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Old Apr 29, 2012, 11:40 AM
Veni, Vidi, Feci
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Motor City
Joined Dec 2004
12,261 Posts
Warning: build it light. That kit is Heavy!
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Old Apr 29, 2012, 04:42 PM
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United States, TX, La Porte
Joined Apr 2007
1,642 Posts
Kmot, yes there is a lot of structure under the deck and as Pat says I want to build it lite. I have been covered in sawdust the past few days as I have cut lightening holes all over the frame. I will post those pictures in the next batch.
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Old Apr 29, 2012, 08:36 PM
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United States, CA, Orange
Joined Aug 2011
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Gravman

Frank, has a lightweight fiberglass deck. Did you consider using that? CaptCB
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Old Apr 29, 2012, 09:10 PM
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United States, TX, La Porte
Joined Apr 2007
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I did not know that he offered one.
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Old Apr 29, 2012, 11:56 PM
Taking care of the pond.
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USA, CA, Fresno
Joined Apr 2004
7,252 Posts
Got me hooked.
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Old Apr 30, 2012, 06:50 PM
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United States, TX, La Porte
Joined Apr 2007
1,642 Posts
Deck Assembly

Completed the deck and hatch assembly. Total weight of finished parts is 958 grams.
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Old May 02, 2012, 06:40 AM
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United States, TX, La Porte
Joined Apr 2007
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Making it lighter

In an effort to reduce the weight of the hatch and deck assembly, I cut holes in the frame to reduce weight. Total weight savings was 175 grams.
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Old May 02, 2012, 03:06 PM
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United States, TX, La Porte
Joined Apr 2007
1,642 Posts
Hull Correction

The hull that Dumas produced has a couple of flaws that should be corrected. The most important one being the "bow correction". The forward section curves downward, if you look at the plans that are provided you will notice that the bow does not curve downward. In the video provided by FMH this correction procedure is covered.
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Old May 03, 2012, 06:51 PM
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United States, TX, La Porte
Joined Apr 2007
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Hull Correction

If it's one thing I hate to work with it's polyester resin and fiberglass mat. Anyway, I got the mat laid into the hull without too many problems.
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Old May 04, 2012, 10:07 AM
"Damn The Torpedoes...."
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Mount Dora, FL.
Joined Oct 2007
507 Posts
Gravman, good to see your making progress. I made my weight less by doing the same thing and the bow correction looks great.
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Old May 04, 2012, 05:40 PM
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United States, TX, La Porte
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Looks very well done PT-333
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