RC Rescue Boat built from Styrofoam

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Bernd:
Thanks Jack,

Mothers first Christmas was a bit tough on her but she survived. Plus she's going to be a great gand ma, so that cheered her up a bit.

As far as the motors go. I think they'll be powerful enough. They just about push the boat across the table now. Next would be to try a bigger prop. It doesn't take much to push a boat through water. We'll see come spring time.

Just need tofigure out a way to mount the air rudduers onto the back. Need to get a radio too. Gives me something to work on between doing the molding in the house. :)

Bernd

madjackghengis:
Hi Bernd, it's good to know there is something happening with your mother that is upbeat, attitude will keep a person alive when lack of anything to look forward to leads to depression, it's good to hear she's about to become "great grand-ma", and that she got through Christmas all right. I just got a call from my mother last night, and she's past the pnumonia and doing better, so I'm much relieved.
It's also good to see you back on the boat, I suspect you will try many motors before you're done, unless what you've got does just what you had in mind, in which case, why change what works? with regard to the steering of the air, have you considered a "quarter moon shaped or "C" shaped sheet aluminum piece, around the motors, with the tips of the "C" being the pivots for the rudders, and the body of the "C" being an air guide to reduce the turbulence sure to be generated? That would put the needed bell crank either above the motors, or beneath them, and out of the airstream, reducing interference and giving a solid mount for the "rudders". I've seen similar on air boats used in Florida, and out here in the swamps of North Carolina. I haven't done anything with such things, but a lot of emphasis seems to be put on guiding the airflow into the blades as much as there is in the rudders. Aerodynamic nacelles for the motors would let the air move more efficiently, and reduce turbulence, which is probably as important for power as the motor design its self. I don't know much about air boats, but I spent a long time around helicopters, and they tend to give one a good amount of respect for turbulence, given the work done, and the slow speed it gets done at. I hope this adds a bit to think about at least. Other than that, you're looking good, and with some time before spring. :headbang: mad jack

Bernd:
Thanks for the kind comments Jack. Things are looking up.

As far as the rudders are concerned. I think aluminum might be a bit to heavy for the back end. I's gotten a piece of 1/32" out in the shape to cover the whle blade length and it would get a bit to heavy with two. Thinking of going with a 1/8" foamboard cover with epoxy to water proof. Will see.

Haven't done much since I last posted the pics. Been a bit on the down side. Recovering though. Lot's of post op deppression to work through. Been there once.

Bernd

HS93:
A qiuck tip re your motors you need to open up the holes on your motor mount tubes by the brush gear they act as an aid to cooling in your case the air will come in the slots at the front and go out the holes by the brush, if you dont you may find your motors get hot, Just look at comercial motor mounts they always go to the trouble of cutting them out for the front mounts.

peter

madjackghengis:
Hi Bernd, just a thought, with weight your concern, some 1/32 balsa covered with plastic sheet or a doped finish is about as light as it gets, and is quite stiff and strong for the weight. It's kind of funny, with all the advances in science, the same materials that were best for modelling fifty years ago, still are stiff competition with modern materials. Jack

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