Subject:
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Re: Sometimes LEGO makes me crazy
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Newsgroups:
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lugnet.general
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Date:
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Mon, 2 Jul 2007 17:40:10 GMT
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Viewed:
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2328 times
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In lugnet.general, Jordan Schwarz wrote:
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In lugnet.general, Duane Collicott wrote:
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A while ago I built a wind tunnel, and I’ve been wanting to try out the
Exo-Force turbines to see if they can provide any more propulsion than the
propellers I’ve been using. After all, they have more blades and the blades
have a greater pitch than the propellers.
Well I finally got around to it experimenting with them, and during my
testing it seemed that when I ran them one way I had air movement coming
from the center, and then from the perimeter when I ran them the other way.
So, I stopped them to take a closer look, and it turns out that the inner
circle of blades are pitched one way and the outer circle blades are pitched
the other way! What’s with that?
So, they’re completely useless to me. Of course, this also means the
Exo-Force machines can’t fly!
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Sounds like an interesting problem you’re facing. Although the blade area is
still quite small, the LEGO Znap large wheels, 68mm (if you can find them)
have a blade profile which should be able to drive a small wind tunnel. See
this part below:
http://www.peeron.com/inv/parts/x335
You can also stack two together to get a six-bladed rotor, which helps
somewhat. These are mounted on any standard Technic axle.
The issue is the small blade area. You really need more to drive a wind
tunnel. These rotors would be excellent in use as functional water impellers.
You could try making your own drive fan in order to get larger blades.
This wind tunnel project sounds interesting - post pictures if you get some!
-Jordan
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Thanks for the idea. I’m currnetly using two of these,
http://www.bricklink.com/catalogItemPic.asp?P=2952 nested together (they’re
apparently designed to do that) to make a four-bladed prop. I use four sets of
them in an array. That seems to be my best option so far.
Here are some pics: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=155937
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Message has 1 Reply:
 | | Re: Sometimes LEGO makes me crazy
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| (...) [snip] (...) Hi Duane, for a rectangular shape of a tunnel this propellor would not be perfectly right, but I would guess, that this is the so far best prop, which LEGO has done: (URL) a weak spot this one has the gear wheel fixed to the axle, (...) (17 years ago, 3-Jul-07, to lugnet.general)
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Message is in Reply To:
| | Re: Sometimes LEGO makes me crazy
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| (...) Sounds like an interesting problem you're facing. Although the blade area is still quite small, the LEGO Znap large wheels, 68mm (if you can find them) have a blade profile which should be able to drive a small wind tunnel. See this part (...) (17 years ago, 2-Jul-07, to lugnet.general, FTX)
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