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    Sometimes LEGO makes me crazy —Duane Collicott
   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 (...) (17 years ago, 2-Jul-07, to lugnet.general)
   
        Re: Sometimes LEGO makes me crazy —Jordan Schwarz
     (...) 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)
    
         Re: Sometimes LEGO makes me crazy —Duane Collicott
     (...) Thanks for the idea. I'm currnetly using two of these, (URL) 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: (...) (17 years ago, 2-Jul-07, to lugnet.general, FTX)
    
         Re: Sometimes LEGO makes me crazy —Reinhard "Ben" Beneke
     (...) [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)
   
        Re: Sometimes LEGO makes me crazy —Brian Davis
   (...) Yeah, I had almost exactly the same revelation, but examined the blades first. I've tried to come up with a ducting that would make them useful (they will "pump" air if you could route the central outflow back into the annular "inflow", and (...) (17 years ago, 2-Jul-07, to lugnet.general)
   
        Re: Sometimes LEGO makes me crazy —Duane Collicott
   (...) You know, you would think I would have checked first. On the other hand, you know me, so perhaps you wouldn't think I would have checked first! (17 years ago, 2-Jul-07, to lugnet.general, FTX)
 

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