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Old Nov 18, 2007, 06:21 PM
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Dumas USCG 41' utb

Over the years, I have owned several of the small 1:32nd scale Dumas 41' utb kits #1216 . The first was over twenty years ago. Don't know why, I guess i just like the way they look.

The most recent one was built 5 years ago, and went through a couple of refits to get to the point where it was when these two photos were taken in July of 2007.

For the most part, it is a difficult boat to r/c simply due to its size and the fact that Dumas has you make it out of 1/8th and 1/16th inch plywood for the hull, and 1/16th and 1/32nd inch plywood for the superstructure. in my latest version (#3) a quick fix was to remove most of the bulkheads after the hull was built, and to use 1/16th inch balsa to skin the hull instead of plywood. It was still heavy, and didn't perform as well as I wanted it to. It wasn't until I could put a tiny brushless outrunner and lipos in it that it ran as I wanted it to.

To make a long story short, the exensively modified version 3 sank in september of 2007. I had been contemplating making a new one, even going as far as ordering a replacement kit from Dumas. This build thread will track my attempts to make a scratchbuilt replacement #4...
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Last edited by tsenecal; Nov 19, 2007 at 12:33 AM.
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Old Nov 18, 2007, 06:40 PM
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You know, I have been looking at that kit for some time now, as I'm not afraid of small models.

The last time I checked their website, Dumas had the kit on the "discounted" list for a very modest price.

Perhaps a good starting point?
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Old Nov 18, 2007, 07:35 PM
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Hee hee, resistance is futile, Der Kapitan!

Looks like a very nice build there, Tsenecal! amazing what brushless and lipo have done for small, perfomance boats!

I have the bigger version of this kit under my workbench... I plan to build it in "Boat U.S. / Vessel Assist" colors.... (someday )
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Old Nov 18, 2007, 09:18 PM
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der kapitan,

yep, the boat has been on Dumas' discounted site for $35 for at least 6 years now, that is how i finally decided to try my hand at #3, and yes, I think it makes an excellent starting point.

Aerominded, lipos and brushless can only take the boat so far. I also had to buy a micro servo, and paint it with epoxy paint, ignoring any other sealing like fiberglassing, to save as much weight as possible. After the lipo/bruhless conversion #3 sat at the waterline.

My goal with #4 was to make something worthy of the progress in technology as well as my own skills. I wanted to make #4 have as many working features as it could handle. This includes navigation lights and spotlights, rotating radar, fully detailed interior, and possibly a fire monitor. To accomplish this, the heavier wood hull won't work. Luckily I saved the hull from #2, and my personal skill set now allows me to think about things like custom made vacuum forming molds.

having said all that, behold the first step in #4's creation:
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Old Nov 18, 2007, 09:28 PM
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Vacuformed! Neat!!! How much do the hull and deck weigh?
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Old Nov 18, 2007, 10:04 PM
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Aerominded

deck weighs 43 grams (1.5 oz)

hull (best guess) weighs about 70 grams (2.5 oz)

for the math illiterate that makes a total of 113 grams or 4 oz.

oh yeah, it is .040 thickness ABS

Tim
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Old Nov 19, 2007, 08:32 AM
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41 UTB in Vacuform,why not?

Since Dumas seems to be moving that way on most of there kits,this one would be be perfect.Vacuform hull and die cut styrene deck and pilot house.Just like the mine sweeper they now produce.
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Old Nov 19, 2007, 08:00 PM
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Quote:
Originally Posted by Aerominded
Hee hee, resistance is futile, Der Kapitan!
Yeah, I know. The flesh is weak---.

I ordered one this afternoon, $35.00 plus $6.00 shipping. Can't go too wrong with that price---.

First wood kit I've bought since the 1970's---.
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Old Nov 19, 2007, 08:02 PM
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Hee hee, Sounds good, Kap!

4 oz. total sounds great!
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Old Nov 19, 2007, 08:13 PM
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I just might use the kit as a plug, and do it in fiberglass.

It'll fit in with the 26, 40 and 44 footers I already have---.
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Old Nov 20, 2007, 12:07 AM
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Little bit of a jump here in the photos, a few more steps completed:

1) Using the wood from the kit as templates, I made plastic duplicates of the cabin. I used .030 sheet styrene.

2) Using 1/8th inch brass tubing, and 3/32 inch brass rod, and 1/2" by 1/32" brass sheet, I made a stuffing box, propshaft, rudder post and rudder.

3) Installed a micro servo, a himax 2208 micro brushless outrunner, and a novak xxtra receiver, as well as an 800mah lipo. Last but not least, I ordered one of these: losi 1/36th scale brushless ESC

in anticipation of Aerominded's question: total weight now is 272g or 9.6 oz. more importantly, it sits about 1/4" above waterline. runs great.
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Old Nov 20, 2007, 12:11 AM
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der kapitan,

I also considered doing it in fiberglass, but decided the vacuum formed ABS would weigh considerably less, and cost considerably less as well. If you knew how little the two part deck and hull cost to pull, you would be astonished.
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Old Nov 20, 2007, 12:19 AM
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Hee hee, you know me well!

re cost, about 30 seconds of labor and $1 (retail) in material per part!
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Old Nov 20, 2007, 12:34 AM
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more like $1.50...
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Old Nov 20, 2007, 01:01 AM
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Quote:
Originally Posted by tsenecal
more like $1.50...
Does this mean that Vac formed hull's are available?...

*slaps head*.. like i need another project!!!!
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