General Misc > Misc
My first "Robot"
gamefreak:
Hey i've finally done it, i've finally started on my first "robot", it is RC and will hopefully get me a full ride to florida this summer.
It is an RC hover car for a robotics club competition and a TSA event, it will be made out of styrofoam and balsa wood. I will post the items and price list later.
This is a 3D model i've made using solidworks, there are a few things missing such as wires and a way to stop the motor from floating in the air. I intend to hook strings to the servo and have them go to either side to steer the rudder.
it is basically a 18,by 9, by 8
Do you think that this duct is large enough, or should i go about half? Also, should i just use some stryofoam from a hobby store or is there a better one out there?
Admin:
be careful to make sure the weight is distributed . . . a big fan motor in the back will make your robot butt-heavy :P
I'd probably make the duct longer, but its just based on my intuition of fluid flow . . .
gamefreak:
by longer what do you mean? do you mean go further back?
Also does the duct need to be bigger? I took a old computer power supply ripped the fan blade out and attached it to my motor, the fan i sprobably 5 inches in diamter and has 5 or 6 blades(sorry i cant be more descriptive, i dont have it in front of me now) So far im up to 10-12 cuts on my finger from a lack of clamps and having to hold it by hand to test it, those fans are sharp.
Admin:
--- Quote ---by longer what do you mean? do you mean go further back?
--- End quote ---
The point of a duct is to be a 'flow straightener' - meaning it directs flow in a single direction.
You want the duct to be just slightly larger than your fan diameter in width, and not any more so the flow doesn't 'escape'.
A longer tunnel can straighten flow better . . . but too long creates too much air resistance . . . too short and your flow isn't straightened.
So what I meant was, make it longer (not diameter but the other dimension).
gamefreak:
alright but what about the duct on the bottom that takes thrust and turns it into lift.
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