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Mar 19, 2012, 04:41 PM
Registered User
Question

Nubie first question


Hi, I am 12 years old and want to build a hovercraft from scratch.
I have been reading the threads here trying to learn about how to build one.
My problem is i do not understand all of the language around the RC world.
Can somebody tell me what a ESC motor stands for.
Any direction towards a inexpensive remote control and servo can be bought would help me a lot. Cheers Alex.
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Mar 19, 2012, 05:32 PM
Registered User
piito's Avatar
Quote:
Originally Posted by Mungo Parks
Hi, I am 12 years old and want to build a hovercraft from scratch.
I have been reading the threads here trying to learn about how to build one.
My problem is i do not understand all of the language around the RC world.
Can somebody tell me what a ESC motor stands for.
Any direction towards a inexpensive remote control and servo can be bought would help me a lot. Cheers Alex.
ESC is basically a speed controller for the motor(s) you are using. You can use a simple ON/OFF switch to power the motor(s) but this will give you only 100% RPM level or 0%. So if you want to slowly decrease or increase the motor turns you will need a ESC (speed regulator) between the motor and receiver.

You can use a Spektrum system: http://www.ebay.com/itm/Spektrum-DX5...item53e67be8d4
or http://www.ebay.com/itm/Walkera-2-4G...item2c5fc9ebe9

There's plenty of manufacturers, just type in 4 channel Tx Rx at ebay and you'll find what you are looking for. You will get used system with half price usually.

Have fun with your project
Mar 19, 2012, 06:11 PM
Registered User
ESC = Electronic Speed Control. And for modern (brushless) electric motors it is needed to drive the motor.

BTW if you want ideas on what to buy it's useful to know where in the world you are.

Steve
Mar 22, 2012, 09:17 AM
Registered User
Thank you for your help, I live in Canada, Winnipeg.
Alex.
Mar 22, 2012, 01:50 PM
Hot glue held together by foam
balsa or carbon's Avatar

Inexpensive RC supplies


Here are some links to where you can get inexpensive RC supplies . Radio transmitter with receiver : http://www.hobbypartz.com/79p-ct6b-r6b-radiosystem.html Motor , ESC ( Electronic Speed Control ) and servos ( control your rudder , etc. ) combo : http://www.hobbypartz.com/60p-dy-1006.html Batteries ( get at least two ) : http://www.hobbypartz.com/77p-sl1000-3s1p-40c-3333.html Battery charger : bottom left of this page http://www.lazertoyz.com/shop/batteries.htm This is a very easy to make ( skirtless ) hovercraft - kinda works like an Air-hockey puck . Made from 1 piece of Dollar Tree foamboard , some hot glue and packing tape . 1 motor ( connected to throttle channel ) inside can for lift , a second motor ( connected to elevator channel ) for forward thrust , and rudder servo connected to either rudder or aileron channel . Here's a video of it , took the hood off because it was hitting the thrust prop
Skirtless hovercraft (2 min 7 sec)
Last edited by balsa or carbon; Mar 23, 2012 at 09:31 AM.
May 07, 2012, 03:57 PM
Tailless fly-hard
RPM314's Avatar
Hi, I want to do the same thing as Mungo, but am a bit more familiar with R/C stuff. For racing, what is the best planform? Nobody seems to have that info. Also, I'm planning to power everything with EDF, and build with Depron, would that be good? Thanks.

Also, how exactly is the skirt constructed? Still unclear on that.
Last edited by RPM314; May 07, 2012 at 04:50 PM.
May 08, 2012, 07:39 AM
The Anti-Heli
ramicaza's Avatar
This is probably your best bet for racing. EDF lifter's are inefficient so try getting the lowest kv lifter motor you can find (that still fits in the fan of course) Skirts are tricky so therefor, I would suggest going skirt less... especially for racing. LOL I'm basically summarizing the hovercraft I linked. Another must have for racing is a proportional lifter on your throttle or elevator. You need to be able to stop fairly quickly. Depron is ok but I suggest taping up the bottom of the craft with fiber glass re-enforced tape of similar.
May 08, 2012, 07:44 PM
Tailless fly-hard
RPM314's Avatar
Well, skirtless would only work on linoleum type smooth surfaces, which tend to be too small to reach top speed. I think tarmac would be best for speed, so a bag skirt. Multi-terrain capability is important: I'm not looking for strictly 'racing', just fast. I'm also on a budget, so a single EDF is the max. I know that that will involve compromise, but it's necessary and simpler.
On the attached file, the fan feeds a bit of exaust into the skirt, with a flap to control the intake. Also, a couple of 6mm depron sheets sandwiched with epoxy to make 1/2 inch layer. (The skirt looks messed up, but sketchUp isn't good at that kind of stuff.)
Last edited by RPM314; May 08, 2012 at 07:49 PM.
May 09, 2012, 05:24 AM
The Anti-Heli
ramicaza's Avatar
Skirtless is fine for tarmac with a sufficient lifter. However water is an issue unless you design a bulky, beveled, depron, "stiff skirt" I've never had very good luck with the flap type design. It might be that I just like the drifting capability of a conventional lifter/pusher set up but thats just me. IMO, you should really throw in the bit of extra money required to buy the lifter motor/esc. A conventional prop will do.
May 10, 2012, 05:24 PM
Tailless fly-hard
RPM314's Avatar
No, I found some good skirt material here. How about the skirt stuff is its own part that is velcro'd onto the rest, and makes a skirtless craft without it?

I'll just get props (high pitch) instead of EDF if the lifter is that important. SketchUp model pending.

Edit: how would one control the lifter with a conventional Rx? Plug the ESC into a servo port?


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