RC Rescue Boat built from Styrofoam

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Bernd:
Information all gladly recieved picclock. You never know when somebody might find an answer inside one of these disscussion.

The motor's came out of a juncked toy. Can't remember the amperage. At 12 volts the motors with prop pull round 18 to 20 amps. I plan on driving the motors with a pusle widith modulation drive. Something I found in a robotic book on developing drives for robots. They've got drives up to 50 amps in there. I've ordered the parts and should have something running buy neek week I hope.

One major purchase left and that's a radio. Been loking around. Looks like Tower Hobby has the best and most.

Bernd

madjackghengis:
Hi Bernd, I just wanted to say, Mauser Electronics has some kits for pulse width modulator motor controllers that are easy to build and pretty cost effective. They used to be "Vellman Kits", but went the way of so many other kits. So far that "rescue boat" is coming right along, I'm looking forward to seeing how you do your rudders, both in the water and behind the props. I'm wondering if you've got enough battery power for the whole thing though. I'd hate to see you have to change over to steam or gas power :poke: mad jack. By the way, do you still have snow down there? :lol:

picclock:
Hi Bernd

If your motor is drawing 20 Amps that's 240W (1/3rd Horsepower) which should make it get fairly warm :bugeye:. With two it should be very impressive.

For some reason I thought they were from a ride on kids toy :hammer:. PWM should work great for that.

Takes me back to my RC boating days where an electric speedboat of mine had a water pickup under the hull ( a bit of brass tube ) which wrapped around the motor to keep it cool, then discharged the water overboard. Built if for my kids ::) and the pushchair was useful for transport as well :ddb: .

Good Luck

picclock

Bernd:

--- Quote from: madjackghengis on January 04, 2011, 11:23:41 AM ---Hi Bernd, I just wanted to say, Mauser Electronics has some kits for pulse width modulator motor controllers that are easy to build and pretty cost effective. They used to be "Vellman Kits", but went the way of so many other kits. So far that "rescue boat" is coming right along, I'm looking forward to seeing how you do your rudders, both in the water and behind the props. I'm wondering if you've got enough battery power for the whole thing though. I'd hate to see you have to change over to steam or gas power :poke: mad jack. By the way, do you still have snow down there? :lol:

--- End quote ---

I want to try and scratch build that PMW out of the robotics book. If it works great if it don't oh well. Got the 1/8" stainless I ordered so will start on getting the rudders mounted. Not sure if I'm going to go with water rudders yet. Might wait to see hoe it reacts in the water first.

SNOW, what's that. 20 miles south of Rochester we were without snow on New Years day. Just got a bit here the last couple of days.

Bernd

Bernd:

--- Quote from: picclock on January 04, 2011, 11:54:02 AM ---Hi Bernd

If your motor is drawing 20 Amps that's 240W (1/3rd Horsepower) which should make it get fairly warm :bugeye:. With two it should be very impressive.

--- End quote ---

I'm guesstimating on this becasue it sent my 10amp meter right off the scale and it flashd 18amps.

--- Quote ---For some reason I thought they were from a ride on kids toy :hammer:. PWM should work great for that.
--- End quote ---

They are from one of those kiddy ride toys. These are quite big motors. A bit bigger around than a "D" cell battery. Perhaps I should take a picture for comparison.

Bernd

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