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1/2A Size Dumas Boat Club

Old 07-02-2010, 09:03 PM
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Default RE: 1/2A Size Boat Club

Hey, that sloop is no slouch. I bet on the chop your the winner with that. I remember taking mine out with whitecaps on the lake, swung the sails out on it and trolled behind it with the fishing boat downwind. It was fun to see it carve a wave and climb it then bail off with the sails at full spill horizontal, straighten out and start to gain on the next one. Fun times when your stuck in the middle of the woods.

Show us the work when your done!
Old 07-02-2010, 10:20 PM
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Default RE: 1/2A Size Boat Club

  Hey looks perfect ,great find! I wonder who makes them?[8D] How much does a aluminum one weigh? I would imagine I need half the weight of a steel Dumas flywheel. My guess is 1/2oz to 3/4oz would be kind on the motor, since I do have  throttle I can avoid allot of over revving during start up. Right now the compression is mint and I expect some extreme rpms I have a laser tach and look forward to checking the top end. [:@] I plan to use a Octura cut down Octura 0927 to 0924.
Old 07-03-2010, 01:05 AM
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Default RE: 1/2A Size Boat Club

RJ, you need to drop a rudder servo into that sailboat and race over and back. Then you might have a chance to run him out of fuel at the same time
Old 07-03-2010, 01:59 AM
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Default RE: 1/2A Size Boat Club

he guys i am back

i have 3 problems

1 evrytime i run my boat something goes wrong (tank bursts-fuel linebreaks-flywheel and axele get loos)
2 i have no camera man and i cant film myself when i am sailing
3 i hate fisherman they wont let me sail on the other side of the lake (they have fishing poles evrywere)


but my boat is done and sails good
Old 07-03-2010, 02:06 AM
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Default RE: 1/2A Size Boat Club

Set the camera on the bank and film fly byes. = ) glad to hear its running you have to keep things extra tight ... they rattle about I found if you tighten everything up when its been ran and hot; the drive line stays secure when tightened and then let it all cool down before running again.
Of course you can use Loctite.
Old 07-03-2010, 11:04 AM
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Default RE: 1/2A Size Boat Club

Hi Robot!
Welcome to the wonderful world of model boats!

Yeah Cox engine vibrate like hell so I would reconmend using loctite on the threads of the screws to prevent them from getting loose. Use new fuel lines and use rubbing alcohol to clean the nipples where they connect to to clean off any fuel residue and make sure they are dry before putting them on...
Like pond skipper said, just lay the camera down on something and do some flybys.
If the fisherman arent catching any fish then just tell them that they dont know how to fish and to try another hobby, like rc boating for example!


HJ My Ace sloop is just fine the way it is. However I do intened on getting a star 45 soon and thats radio controlable.....and costs less on fuel too!
Old 07-03-2010, 12:44 PM
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Default RE: 1/2A Size Boat Club

i am pleased to see a welcome (again been here for a few months)

and thank you for the tips

i found a way to keep the fuel line on

en when is gets to 25 celcius i will sail it

it is now 35-40 and that is to freaking hot

you met just by walking on the sidewalk
Old 07-03-2010, 01:22 PM
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Default RE: 1/2A Size Boat Club

Oh C'mon! 35C isnt too bad....Thats an average summer temp in this part of the US where I'm at.... [8D]
The coldest it gets here during winter is about 2C.......But it averages around 10C
but thats only where I live which is Deep south coastal Texas.... [8D][8D][8D]
Old 07-03-2010, 03:17 PM
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Default RE: 1/2A Size Boat Club

l love it when it is cold

against the cold you can do thins the heat canot be fought
Old 07-13-2010, 12:02 PM
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Default RE: 1/2A Size Boat Club

Some pictures of my old 1/2A Mono.
18" Long
Cox TD .049, Ace exhaust trottle
.093 flex cable(Octura) with home made flywheel and hardware
Dumas 1" prop in surface drive strut
2 Oz Sullivan tank
Used with 25% Nitro (car fuel with extra castor added)
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Old 07-13-2010, 12:28 PM
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Default RE: 1/2A Size Boat Club

Man that looks awesome, nice job! I like the engine mount...How well did it run? Was it fast or slow?
Old 07-13-2010, 02:31 PM
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Default RE: 1/2A Size Boat Club

Ran it only twice before being told that "Gas" engine where not "allowed" in that pond. It ran a lot better than the Dumas DV-10 I had around 1982, also with a TD .049 because its a lot lighter,
the Dumas wooden kits for 1/2A where grossly overbuild. Whish I had been able to do more testing, the Dumas 1" prop has very low pitch(it was Ok with the DV-10 submerged)and I feel I would have been able to swing an Octura X427 or X430 as surface drive. My old DV-10 also didn't had a trottle( boat was heavy enough with one standard servo/Rx of the period + a 500 mA ni-cad pack)but this one does. I tried also a 1/2A Tarno carb but the exhaust sleeve works better. This boat use much smaller electronic and the hull is made out of 1/32" plywood mostly(except the transom and engine rails,1/8")the deck is 1/8" balsa planking. Used WBPU for protection and it stood the fuel very well. The speed was about the same as ZIG-ZAG/speed 400 with that Dumas prop, it would had been a lot better with an Octura prop.
If I can find a more welcoming pond I'd gladly experiment more[sm=punching.gif]
Old 09-20-2010, 03:21 PM
  #288  
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Default RE: 1/2A Size Boat Club

hello all is thread dead haven`t seenany action on this forum
Old 02-20-2011, 01:11 PM
  #289  
 
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Default RE: 1/2A Size Boat Club

Not quite, I trashed my old Mono and will start on a semi-scale hydro soon with the power plan from it. There is another similar thread going which has been quiet lately (Winter?)
http://www.rcuniverse.com/forum/m_9144007/tm.htm
This is the shape of things to come, and some neat 1/2A engines.
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Old 02-20-2011, 05:22 PM
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Default RE: 1/2A Size Boat Club

I looked at ancient plans today on eBay how to make an .049 outboard. I like the TD O/B you are showing!
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Old 02-20-2011, 07:04 PM
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Default RE: 1/2A Size Boat Club

It is a "one of a kind" home build and uses a TD .010! Don't know how it perform but with such a small prop its probably more of a curiosity than a user. Found it in that site(item # 130)

http://www.craftsmanshipmuseum.com/KnappCol.htm
I have toyed with the idea of converting a Jackson outboard to TD .049 but not sure its worth the trouble (small gear drive are very draggy) used to have an .049 K&B Allyn as a kid and it wasn't a power house! Was using it in a semi scale runabout (free running) about 20" lenght.
Old 02-20-2011, 07:25 PM
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Default RE: 1/2A Size Boat Club

Good god! I didnt see the quarter sitting next to the O/B till now....
Old 02-20-2011, 07:35 PM
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Default RE: 1/2A Size Boat Club

Wow, it is a .010. Thought something looked funny. Lots of handwork put into that. It's nice.

Thanks for the link too, its a cool place! Never seen that before.

I've been wanting a SeaFury to polish out but the price of those recently went too high. I still would like to have one.
Old 02-20-2011, 08:51 PM
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Default RE: 1/2A Size Boat Club

Dave, I ran into these yesterday at a local swap meet..........
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Old 02-23-2011, 04:50 AM
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Default RE: 1/2A Size Boat Club

Lots of money on that table! Those motors have been selling at over $150.
Old 02-23-2011, 06:08 AM
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Those were tagged at $165-185.00.
Old 02-24-2011, 02:47 AM
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Default RE: 1/2A Size Boat Club

Too rich for my blood because if I was to buy one, it would only be a display. They seem to be a good investment though. Prices only go up with those.
Old 02-24-2011, 08:13 PM
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Default RE: 1/2A Size Boat Club

How about a vid of them little ones running ? RJ back as is JP , YOU ALL BEEN HIBERNATING
one sighs in then the other one. Ron is that a tether car you got there too. I always wanted one of them .
Old 02-24-2011, 08:46 PM
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Default RE: 1/2A Size Boat Club

Yeah, he had 2 of them there, one stock and the other customized with a windshield and pinstriping.
Old 02-25-2011, 05:08 AM
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Default RE: 1/2A Size Boat Club

Hi to all vintage boat enthusiast`s
I am one of those kinds of builders, which draw the plans on their own.
I am planing to construct a plan and build a vintage hydroplane.
I want to use a "small block" motor COX 0.8cc (not on RC) something like that-I am not sure for it`s displacement.
It is with carburetor&fuel tank on the back of it.
I can provide more information if you want/need them.

The drawing will be created on base of many photos from internet.
All what is missing is your knowlege about the powerplant (The max weight of RTR boat and propeller size)
But the most important thing is the lenght of the boat!!?
I can make the decision on my own, but I need your opinion on this.

After all...
This is the best place to get the right information`s!

And another thing:
Starting the engine.
I don`t want to have belt inside of the boat all the time.
I saw this video:
<a target="_blank" style="color: rgb(56, 125, 228); text-decoration: underline; font-family: Verdana, Arial; font-size: 13px; -webkit-border-horizontal-spacing: 1px; -webkit-border-vertical-spacing: 1px; " href="http://www.americanjuniorclassics.com/movies/Boats.wmv">http://www.americanjuniorclassics.com/movies/Boats.wmv

</a>Is the Flywheel in the movie designed like this one:
?
Or another question. How to start engine with flywheel like that?

The second design is pull start option:


I all so need info for flywheel dimension`s (diameter and weight).

Thank you all, for help!<br style="font-family: Verdana, Arial; font-size: 13px; -webkit-border-horizontal-spacing: 1px; -webkit-border-vertical-spacing: 1px; " />Matej O. from Slovenia.
p.s. For my writing/spelling mistakes I apologize in advance.<br type="_moz" style="font-family: Verdana, Arial; font-size: 13px; -webkit-border-horizontal-spacing: 1px; -webkit-border-vertical-spacing: 1px; " />

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