Subject:
|
Re: hoovercraft with lift, thrust and steering
|
Newsgroups:
|
lugnet.technic
|
Date:
|
Wed, 5 Mar 2003 21:21:47 GMT
|
Reply-To:
|
Øyvind Steinnes <{phoenix@online}SayNoToSpam{.no}>
|
Viewed:
|
1989 times
|
| |
|
|
"pixel" <pixsrv@poczta.onet.pl> wrote in message
news:HB9n89.DzD@lugnet.com...
> "Paul Krieg" <pdkrieg@epix.net> wrote in message • news:HB9KH9.8H1@lugnet.com...
>
> > Well, my rotor blades are a bit big (about 12 x 36 L).
> oh G! :)
> what motor will rotate it?
With those big blades you do not need the high speed to get lift, so you can
use a geared down motor for this I think? But that sounds more like an
helicopter then an hoovercraft...
> it has to create much resistance on the air
> > They are made this way to save weight as
> > your hoover craft is
> but it could cause the hovercraft will rotate instead of propeller :)))
> (joke)
Well it is not a joke, my craft is now so light that it actually spinns the
craft almost in about half the speed of the fan if I dont hold it back with
something...
How can I stop the air under the craft go spinning?
Some fins under the skirt hanging down? Some airtunnels going outwards?
I do not want the air to go straight downwards like pixel's fan is doing,
but I would like the fan move the air outwards to the edge of the skirt and
then down...
Is this not the best way? Or have I missed something again in the
hoovercraft idea?
Actually my simple made fan push the air in a angel outwards and down, and
move about the same amount of air as the fan made by pixel at the same RPM.
But I need a higer voltage to get the same RPM on pixel's fan. Mine can be
driven with just a 9v battery box on an 9v motor and still get lift.
(I use the tuned 4.5v motor because I would like to drive two motors with
one 9v battery box.)
> > > 2. the problem of exploding rotor still stays
> > One way of preventing friction pins from coming loose at high rpm's is • to put a
> > small antenna or pneumatic "T" etc. in the holes so it can't contract.
> where was my brain when i've been thinking of it?
Same here! Where do I keep my brain while building with LEGO? In my pocket?
;)
That so brilliant and simple... like an "Columbo egg"...
Regards
Øyvind Steinnes
http://www.brickshelf.com/cgi-bin/gallery.cgi?m=Phoenix
|
|
Message has 2 Replies:
 | | Re: hoovercraft with lift, thrust and steering
|
| "Øyvind Steinnes" <senniets@online.no> wrote in message news:HBAoL9.9CH@lugnet.com... (...) when we see helicopters they have slim blades with very high rpm so i think wide blades are not too good but keep working... i saw few applications just (...) (22 years ago, 6-Mar-03, to lugnet.technic)
| | | Re: hoovercraft with lift, thrust and steering
|
| <<snip>> (...) This is correct. Another way is to use a "tube"-shaped skirt, blow air into that and let extra air pass through holes on the inside of the skirt. Might be harder to construct though. This way the air comes from the skirt and blows (...) (22 years ago, 6-Mar-03, to lugnet.technic)
|
Message is in Reply To:
| | Re: hoovercraft with lift, thrust and steering
|
| "Paul Krieg" <pdkrieg@epix.net> wrote in message news:HB9KH9.8H1@lugnet.com... (...) oh G! :) what motor will rotate it? it has to create much resistance on the air (...) but it could cause the hovercraft will rotate instead of propeller :))) (...) (22 years ago, 5-Mar-03, to lugnet.technic)
|
20 Messages in This Thread:
 
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
This Message and its Replies on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
