Subject:
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Re: flying helicopter? (was: orrery update)
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 5 Feb 2003 01:27:00 GMT
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Viewed:
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788 times
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In lugnet.technic, Don Rogerson writes:
> In lugnet.technic, Ross Crawford writes:
> > A suggestion for your helicopter - if you can build a single rotor with
> > enough lift, why not just build 2 and connect them, like the chinook
> > http://rotored.arc.nasa.gov/activity/chinook.html
> >
> > That way the extra weight is offset by the extra lift 8?)
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>
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> Ross - The challenge I'd run into would be coordinating the blades so they
> don't chop each other to pieces. Or I'd have to space them out quite a bit -
> the rotor I used in my last try had a radius of about 16L.
The chinook gets around this by having the rotors on different levels - the
rear one is sufficiently high to ensure it can't hit the front.
> Another problem I'd face is getting enough power. To generate any lift, I
> have to develop some serious rpm's. I do this by using a second motor as a
> hand-cranked generator.
Yes, enough power to lift a LEGO helicopter would definitely be a challenge 8?)
ROSCO
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Message has 2 Replies:
 | | Re: flying helicopter? (was: orrery update)
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| "Ross Crawford" <rcrawford@csi.com> wrote in message news:H9tAp0.A1n@lugnet.com... (...) challenge 8?) i'm working on it i developed new fixed 3 blade rotor in a week or two i should be prepared to show you the results of my work regards pixel (21 years ago, 5-Feb-03, to lugnet.technic)
| | | Re: flying helicopter? (was: orrery update)
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| (...) That's not actually right. The chinook has a shaft connecting the rotors keeping them in sync. It has to have one as rotor blades are very flexible. Otherwise their would be a danger of the front rotors bending upwards and hitting the rear (...) (21 years ago, 5-Feb-03, to lugnet.technic)
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Message is in Reply To:
| | Re: flying helicopter? (was: orrery update)
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| (...) Ross - The challenge I'd run into would be coordinating the blades so they don't chop each other to pieces. Or I'd have to space them out quite a bit - the rotor I used in my last try had a radius of about 16L. Another problem I'd face is (...) (21 years ago, 5-Feb-03, to lugnet.technic)
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