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Author Topic: what do i need to make a propeller spin super fast?  (Read 2621 times)

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Offline S. KarimTopic starter

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what do i need to make a propeller spin super fast?
« on: July 16, 2007, 04:01:44 PM »
ok i have a basic propeller facing the ground, im looking to make this spin so fast it generates enough lift below it to "hover" off the ground.

are there any lightweight motors i can get made for this kind of stuff? what kinds of rpms am i looking for? is it possible that a company would be selling gearboxes made for speed rather than for reduction (torque)?

any general to specific info is helpful. im making a hovercraft to float off the ground, using 3 propellers but im not sure about the motors ill need and what kind of electronics/battery with it.

thanks!

Offline dunk

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Re: what do i need to make a propeller spin super fast?
« Reply #1 on: July 16, 2007, 05:07:08 PM »
you probably want to look at electric RC aircraft motors for something this specialised.
try asking on a RC aircraft forum as those guys will know far more about it than any one here.

i say this product a while back:
http://www.skyhooks.ca/kp.htm#KP44
maybe it is what you are looking for?

dunk.

Offline KambeiX

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Re: what do i need to make a propeller spin super fast?
« Reply #2 on: July 16, 2007, 06:21:10 PM »
hmm for fast motors use a brushless one or a normal ungeared or light geared dc motor as they are cheaper. airplane R/C stores should give you more info on the output power and power/weight rating.

For battery, LiPo are the lightest.

 

Offline hgordon

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Re: what do i need to make a propeller spin super fast?
« Reply #3 on: July 17, 2007, 07:08:16 AM »
Look at http://www.rcgroups.com/vtols-360/ for suggestions
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Offline Admin

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Re: what do i need to make a propeller spin super fast?
« Reply #4 on: July 22, 2007, 11:21:54 AM »
Quote
ok i have a basic propeller facing the ground, im looking to make this spin so fast it generates enough lift below it to "hover" off the ground.
When you say hover, do you mean like a helicopter, or a robot sitting on top of an inflated bag (hovercraft)?

If a helicopter, dunks ducted fan suggestion wont work:
Quote
At 32g of thrust it will draw 2.8 Amps. Its weight is 32g.
« Last Edit: July 22, 2007, 11:22:56 AM by Admin »

Offline dunk

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Re: what do i need to make a propeller spin super fast?
« Reply #5 on: July 22, 2007, 05:34:56 PM »
Quote
If a helicopter, dunks ducted fan suggestion wont work:
Quote
Outside Dia. 46mm, inside diameter 44mm (1-3/4"). The body length is 36.5mm and the nose come protrudes an additional 8.5mm Capable of providing 82g of thrust on 4.8 VDC. Minimum tailpipe diameter is 38mm, with a maximum 6? taper. At maximum thrust, this little fan will draw 8 Amps. At 32g of thrust it will draw 2.8 Amps. Its weight is 32g.

doesn't leave much space for batteries and other components but an impressive little fan never the less.

dunk.

Offline Admin

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Re: what do i need to make a propeller spin super fast?
« Reply #6 on: July 22, 2007, 05:56:53 PM »
It appears I cant read . . . lol :P

 


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