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Old Jan 08, 2006, 08:29 AM
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Joined Jan 2006
5 Posts
Question
Dumas PT 109

As a newcomer to this forum, (and to forums generally), please excuse any lack of forum etiquette, should I inadvertently become guilty of it.
I was fortunate enough to receive for Christmas a kit of Dumas' PT 109. While not a complete novice at model boat building, this will be my first "running" model. My question has to do with the selection of engine(s). I would prefer to stick as close as possible to the historical configuration, which would call for three engines. This seems impractical for this size of model. However, I do have two 5.5v motors (manufacturer unknown - presumabley the Asian area). Does anyone have any experience with the installation of two power plants in this model (or similar)? I would be particularly interested in some discussion on the appropriate ESC, batteries, whether one or two rudders are required, whether I should have props counter-rotate in relationship to each other (and if so, how best to achieve that), and so forth.

Many thanks in advance for sharing your expertise...
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Old Jan 08, 2006, 09:56 AM
KC8WPF
CG Bob's Avatar
Euclid, Ohio, United States
Joined Sep 2004
3,764 Posts
Look at my posts (#7 shows motor install) in this PT Boat thread. I scratch built the PT 188 at 1/32 scale. I have two MACK #3150 motors in the boat. The boat runs about 30 minutes on a single 7.2V 3000mAh NiMh battery. I installed two rudders, the rudder servo is near the stern. I am using counter rotating props, Octura 427's or 430's. You dob't need to have counter rotating props. The full size PT boats had three right hand pitch props - they all turned they same direction.

The MACK motors came with the motor lead wires already installed. Since I have counter rotating props, the blue and orange wires from the ESC are each connected to a black and red wire from the motors. The black wire from the port motor and the red wire from the starboard motor are connected to the blue esc wire.
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Last edited by CG Bob; Jan 08, 2006 at 10:07 AM.
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Old Jan 08, 2006, 10:55 AM
Veni, Vidi, Feci
patmat2350's Avatar
Motor City
Joined Dec 2004
12,470 Posts
Three? Impractical? Never!
See three Speed 600's in a slightly smaller PT at:
http://www.geocities.com/patspt41/

Pat M
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Old Jan 08, 2006, 11:08 AM
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steveciambrone's Avatar
United States, CA, Santa Clarita
Joined Dec 2005
1,228 Posts
Which one?

Which size Dumas kit do you have?

Thanks
Steve

Quote:
Originally Posted by 38special
As a newcomer to this forum, (and to forums generally), please excuse any lack of forum etiquette, should I inadvertently become guilty of it.
I was fortunate enough to receive for Christmas a kit of Dumas' PT 109. While not a complete novice at model boat building, this will be my first "running" model. My question has to do with the selection of engine(s). I would prefer to stick as close as possible to the historical configuration, which would call for three engines. This seems impractical for this size of model. However, I do have two 5.5v motors (manufacturer unknown - presumabley the Asian area). Does anyone have any experience with the installation of two power plants in this model (or similar)? I would be particularly interested in some discussion on the appropriate ESC, batteries, whether one or two rudders are required, whether I should have props counter-rotate in relationship to each other (and if so, how best to achieve that), and so forth.

Many thanks in advance for sharing your expertise...
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Old Jan 08, 2006, 12:25 PM
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Joined Jan 2006
5 Posts
Steve, its the 33 inch model.

Thanks to all for responses - most helpful!
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Old Jan 08, 2006, 01:56 PM
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steveciambrone's Avatar
United States, CA, Santa Clarita
Joined Dec 2005
1,228 Posts
Three Speed 400 motors would power it quite nicely. I powered my Lindberg 109 like this and it runs quite well, it is just a little smaller than the Dumas Model.

Thanks
Steve
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Old Jan 08, 2006, 03:23 PM
Grumpa Tom
Kmot's Avatar
United States, CA, Los Angeles
Joined Sep 2003
23,448 Posts
Welcome, 38 Special! (You a handloader, or just like the old rock group?)

While building your PT, have a look/listen to this new sound system for model PT boats: Click Here

From this business:

JJC Electronics
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Old Jan 08, 2006, 04:53 PM
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Joined Jan 2006
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Awesome sound bite, Kmot. Seems like the boat won't be complete without it! And yes, I do my share of handloading, altho the climate for us handgunner's is definitely turning chilly up here in the frozen north!
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