RC Rescue Boat built from Styrofoam

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rleete:
Thin epoxy with acetone (I got a quart at the auto parts store for less than 3 bucks) to make it runny. About 50/50, the mixture ratio is not critical. Paint it on any wood, and it soaks in. Let it cure (a couple of hours for the standard 5 minute stuff), and it's rock solid as well as impervious to mosture.

Bernd:
HS93,

Nice catch. I pulled the motor out and sure enough there are vent holes by the brushes. Even has blades for a fan effect. Nice project for a rotary table on the mill. Thanks.

Jack,

Good idea about the balsa. Never would "wood" have thought of that. :lol: I'll have to look and see if I got two pieces big enough.

Roger,

I went and spent a large sum this past summer on the "West Epoxy System" stuff. I bought some of that thin stuff that fixes dry rot on boats. I had to do some repair on my mom's house windows. So I have a bit left over might try that with Jacks iddea of balsa wood.

Thanks guys. All great tips and are going to be considered. Will let you know what happens as the spirit moves me. Right now I can't find the dam thing. :lol:

Bernd

madjackghengis:
Well Bernd, it seems like all the advise fell into place together, and that epoxy/acetone idea sounds much stronger than the old material with dope way we did it forty years ago, when we were kids. When you find it, you will remember why you put it there, but not until then, I bet. :lol: jack

HS93:

this may help you as well very light and works well.

http://www.rcgroups.com/forums/showthread.php?t=329811

Peter

Bernd:
A bit more progress on the rescue boat.

First pic is of the boat with both motors and both batteries on board. I weighed the boat with these on and it came in at 7lbs. Not bad.

Now as HS93 mentioned that I would probably need vent holes by the brushes. The next several pics depict how it was done. The motor has 4 vent holes and small straight blades to blow air out of the vent holes.

In order to cut the vent holes in the right spot I made a jig out of a piece of paper. The line on the paper represents the step in the plastic pipe to keep the motor from being pushed out the other side.

The paper is wraped around the out side of the motor with the pencil line just even with the body of the motor.

Then taking the side of the pencil I rubbed the area where the opening should be.

I then used a sharp hobby knive and cut out the opening in the paper.

I cut three of the four openings out. I figured the fourth would be covered by the wood cradle holding the motor anyway.

The paper was then taped to the plastic motor pod.

Now since the od of the motor is smaller than the od of the plastic pipe I was left with a gap. Not to worry.

The middle slot of the three slots was cut first. The other two slots were cut using the "close enough" method since they would not come out at the same place as the ones on the motor.

Another view of the middle slot after cutting with a cob mill.

Here you can see were the "guesstimate" came into the picture. I milled through at about mid point and then made the slot longer toward the needed side.

And there we have it the motor mounted with the slots in the motor pods. I could have added the fourth slot since it woun't be coverd by the wood, but feel the motor has enough air getting at it

HS93, I hope this works. Thanks again for the tip.

Now it's on to the rudders. I found a length of 1/8" thick, by 4" balsa. I cut out two rudders about 8.5" long. Now I have to "engineer" the assembly that will hold the rudder's on. Stay tuned while I order some material in the mean time.

Bernd

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