Subject:
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Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 27 Nov 2002 01:22:18 GMT
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Original-From:
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Rob Limbaugh <rlimbaugh@greenfieldgroup.comSPAMCAKE>
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Viewed:
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2727 times
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A ducted fan approach may work.
Ducted fan hovercraft have one or two big fan blades on the back that push
the craft forward, but a duct takes some of the air and uses it to fill the
skirt. This is probably the "lightest" design approach. Direction
(including reverse) is controlled by vanes on the very back.
There is also the famous British hovercraft that had a HUGE thrust fan in
the center of it. The duct looks similar to those nuclear plant tower
hourglass shapes. Although, this design (in LEGO) would be very heavy and
the thrust probably wouldn't be enough.
In either case, one might consider using a thin baseplates for the deck.
- Rob
----- Original Message -----
From: "Steve Baker" <sjbaker1@airmail.net>
To: <marco@soporcel.pt>
Cc: <lego-robotics@crynwr.com>
Sent: Tuesday, November 26, 2002 5:00 PM
Subject: Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
> Marco Correia wrote:
>
> > 3) Is there a LEGO-only way to generate enough air flow (pressure) ?
>
> The experiments we've done with the helicopter suggest that you can
> generate some pretty impressive volumes of fairly slow moving air -
> but high speed/low volume is hard.
>
> The RDS insect wings that we used on our helicopter work really well,
> but I don't think they'd be much use for a helicopter unless you had
> a funnel to take the large volume low speed air and speed it up into
> a narrow stream that could inflate a hovercraft's skirt.
>
> I've seen toy hovercraft that worked well with very small motors.
>
> > One solution to "trap" the air underneath the unit is to build a LEGO
> > framework (as light as possible) and then use plastic film (that used to
> > keep vegetables fresh etc) to create something like the bottom of an
> > hovercraft.
>
> Hmmm - interesting.
>
> ---------------------------- 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
>
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