Subject:
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Re: hovercraft
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Newsgroups:
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lugnet.technic
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Date:
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Fri, 24 Jan 2003 17:35:38 GMT
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Highlighted:
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(details)
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2030 times
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In lugnet.technic, Paul Kleniewski writes:
> now i think it's time to present you
> my application of as pure as possible lego hovercraft
>
> http://republika.pl/pixsrv/lego/hovercraft/
Your design is very inspirational and exciting. I think you've proven that
there's hope to achieving a nearly 100% lego solution.
I've been playing with a prop design some, and despite not testing it yet I
thought I'd post it in case it generates some other ideas, and see if anyone
has any engineering knowledge on prop design and the things we should be
considering. Can anyone explain in general terms the effects that blade pitch,
length and width have on the air flow and power required to drive the prop?
The difference between my design and the one presented by Paul is:
1) 2 blades vs. 4
2) 4x6 plates instead of 2x6
3) Blade pitch is fixed, and appears to be steeper
4) Hub seems to be a little more compact
Here's an MCAD rendering of the design:
http://brickshelf.com/cgi-bin/gallery.cgi?i=308450
Here's the .ldr CAD file:
http://brickshelf.com/gallery/metasim/Hovercraft/prop.ldr
And here's a picture of an implemented model:
http://brickshelf.com/cgi-bin/gallery.cgi?i=308451
Note in the last picture the rubber band. This is necessary as the cross-axle
configuration behaves like a hinge. This is an area of the design that is ripe
for improvement.
I think what is novel about this design is the bricks with axle holes set at an
offset to achieve a fixed blade pitch.
I still need to test it, and hope to make some sort of rig to measure air flow.
Thoughts?
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Message has 1 Reply:
 | | Re: hovercraft
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| when i was testing some new concepts of propellor i found that i had a very much luck :)) because when i did prop with bigger (longer) wings they set more resistance so the motor rotates slower so it puts less air when blades were shorter then press (...) (22 years ago, 28-Jan-03, to lugnet.technic)
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Message is in Reply To:
| | hovercraft
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| hi all now i think it's time to present you my application of as pure as possible lego hovercraft (URL) got 5 movies in mov format but my site is too small so if someone has some room for my movies... all of them have 19.3M the only one tricky point (...) (22 years ago, 30-Nov-02, to lugnet.technic) !
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