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 10:15:30 GMT
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Viewed:
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713 times
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Øyvind Steinnes wrote:
>
> 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.
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 that the propellor starts spinning fast enough
to lift itself and begins to escape from the launcher, but the friction
of the takeoff slows it down and it starts to fall again. The 8t gear
on the propellor's axle usually ends up out of synch with the 40t gear
and as the output axle falls back into place, there is the same sort of
grinding you get when you didn't clutch properly in a manual
transmission car, and the system slows right down. What I've noticed
can happen sometimes is that if you get the output axle up to speed
quickly enough (and I am talking *VERY* quickly here...) it can be
spinning fast enough to overcome the friction of takeoff, but it's still
been slowed down too much to do anything interesting, and the propellor
just immediately falls to the ground -- it never has enough spin to
continue to take it upwards.
What it appears to me is really needed is some sort of mechanism that
can *PREVENT* the propellor from lifting too soon, but does not prevent
it from spinning, and can be released in an instant once the person
cranking the launcher is ready.
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Message is in Reply To:
 | | Re: Zipper--the two-piece flying helicopter
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| "Mark Tarrabain" <markt@lynx.SPAMBLOCK.net> wrote in message news:HG800x.D34@lugnet.com... (...) kind of (...) fly! (...) As someone here mentioned; try using a wormgear. Put your outputaxel, the one with the 8t gears on a axel that goes half the (...) (21 years ago, 10-Jun-03, to lugnet.build)
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