Subject:
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Re: Zipper--the two-piece flying helicopter
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Newsgroups:
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lugnet.build
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Date:
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Tue, 10 Jun 2003 05:13:35 GMT
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Viewed:
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370 times
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"Mark Tarrabain" <markt@lynx.SPAMBLOCK.net> wrote in message
news:HG800x.D34@lugnet.com...
> jrl wrote:
> > I came up with this a little while ago. It's extremely simple, but it's • kind of
> > fun and it's the first thing I've seen built of Legos that can actually • fly!
> > You can check it out here:
> >
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?f=45172
> >
> > PLMKWYT,
> > jrl
>
> Has anyone else tried building a LEGO launcher for this? I've tried
> using a 1:125 ganged gear train made with 3 40t gears and 3 8t gears
> (the final 8t gear being housed on the axle of the spinning toy), and
> just cranking at one end, but the problem seems to be holding it in
> place while it's gathering speed. What happens is that almost as soon
> as I start to crank, the toy leaves the launcher, and then falls down
> right away because it wasn't spinning fast enough to carry it anywhere.
> What I know that I need is some mechanism that can hold it in place,
> still allow it to spin, and when activated, *INSANTLY* releases the
> axle, but haven't had much luck coming up with something that works
> (although my launcher seems to work great for spinning LEGO tops made
> from a short axle and a wheel hub).
>
> Note: 1:125 gear reduction is *HUGE*... The torque you feel as you begin
> to crank this can, apparently, actually snap a LEGO axle.
As someone here mentioned; try using a wormgear. Put your outputaxel, the
one with the 8t gears on a axel that goes half the way into the vertical
placed wormgear. Put the axel that are attached to the propeller into the
top of the wormgear. The wormgear has enough slip so when the propeller has
enough lift it will take of from the wormgear.
I will try this with my 3-blade propeller... and make a LDRAW file for it to
show you what I'm thinking of.
Regards
Øyvind Steinnes
http://www.brickshelf.com/cgi-bin/gallery.cgi?m=Phoenix
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Message has 1 Reply:
 | | Re: Zipper--the two-piece flying helicopter
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| (...) Alas. It doesn't work. The problem isn't slippage, the real problem is that the output axle actually *DOES* rapidly acquire the speed necessary to escape the launcher, but is not yet spinning fast enough to take real flight. What happens is (...) (21 years ago, 10-Jun-03, to lugnet.build)
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Message is in Reply To:
| | Re: Zipper--the two-piece flying helicopter
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| (...) Has anyone else tried building a LEGO launcher for this? I've tried using a 1:125 ganged gear train made with 3 40t gears and 3 8t gears (the final 8t gear being housed on the axle of the spinning toy), and just cranking at one end, but the (...) (21 years ago, 9-Jun-03, to lugnet.build)
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