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Dumas PT 109--speed

Old 09-29-2006, 02:13 PM
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Default Dumas PT 109--speed



Hey Guys--Looking for some advice! Just finished my first boat; a Dumas 48" PT 109.
I'd like a little more speed (top speed is about equal to a slow walk or maybe 2 MPH).
Boat has two 12V Dumas motors (direct drive), props are 1 3/4 (D) x 2 (P), a Dumas speed control and a 12V, 7 Ah gell cell (5 1/4 lbs, a bit heavy). Boat weighs in at 18 lbs.
A few of the local guys suggested replacing the motors with graupner speed 700 BB motors and/or replacing the Dumas speed control with a 'real' ESC --If so, which one?
Your thoughts would be most appreciated.
RyanST
Old 09-29-2006, 03:22 PM
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Default RE: Dumas PT 109--speed

What props do you have on the boat? What pitch? I haven't used the Dumas speed controls since '83 on a boat of mine. The Dumas motors aren't known for their high speed. A hull that large should easily carry the weight of those batteries. I would however run dual batteries for the new set up. This hull should get up on plane when running at top speed.
Tug
Old 09-29-2006, 05:02 PM
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Default RE: Dumas PT 109--speed

The Dumas motors are designed more for the tug boat type models. They have low rpm and high torque. You could try larger diameter and pitch props. But I would try different motors. You can buy a Johnson 700 motor for $3.50 and it will turn way more rpm than the Dumas (18000 vs 5000) @ 12V.



http://www.allelectronics.com/cgi-bi...3-24_VDC_.html

Or 23000 rpm @ 18V:

http://www.allelectronics.com/cgi-bi...DC_MOTOR_.html
Old 09-29-2006, 09:26 PM
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Default RE: Dumas PT 109--speed

twin ASTRO 40 ferrite marine motors direct drive is the way to go. Use either Nimh or Lithium batteries 18v.
Your boat will haul.
Old 09-29-2006, 11:20 PM
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Default RE: Dumas PT 109--speed


ORIGINAL: jshander

twin ASTRO 40 ferrite marine motors direct drive is the way to go. Use either Nimh or Lithium batteries 18v.
Your boat will haul.
Here is a video, in fact, of a 48" Dumas PT-109 with the aforementioned Astro 40 Ferrite motors installed:

Click here to watch Mosquito-Boat

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