Subject:
|
Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
Newsgroups:
|
lugnet.robotics
|
Date:
|
Fri, 29 Nov 2002 20:36:29 GMT
|
Original-From:
|
Steve Baker <sjbaker1@airmail.net/Spamcake/>
|
Viewed:
|
1070 times
|
| |
|
|
PeterBalch wrote:
> I just tried
>
> a 5V processor cooling fan
> a 12V computer PSU cooling fan
> a 3V ducted fan of the sort used to cool your face
> (run at 5V without on-board batteries)
>
> with a 16cm dia polystyrene plenum.
>
> None could really lift their own weight - although the processor cooling
> fan just became a little easier to move.
I think you need a MUCH bigger area under the craft. If all the
motors and stuff on top weighed (say) 100 grams, and you have just
16cm diameter skirt then you need a pressure of:
0.1 / (PI x 0.008 x 0.008 ) kilograms/square meter
...in order to have it hover.
If you double the diameter of your skirt, you'll only need one quarter
as much pressure! If you could build a light enough skirt that was
100 times bigger (1.6 meters in diameter), you'd only need one
ten-thousandth the amount of pressure to make it hover!
---------------------------- Steve Baker -------------------------
HomeEmail: <sjbaker1@airmail.net> WorkEmail: <sjbaker@link.com>
HomePage : http://web2.airmail.net/sjbaker1
Projects : http://plib.sf.net http://tuxaqfh.sf.net
http://tuxkart.sf.net http://prettypoly.sf.net
|
|
Message is in Reply To:
3 Messages in This Thread:
 
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
Active threads in Robotics
|
|
|
|
|
|
