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Hi Chris, :)
> The ZNAP green helicopter set (which I got three of last
> year at $9 each!)
> had some little round turbine-like parts, basically a ducted
> fan. Never tried them out to see if they're actually aerodynamically
I have that set. That was one of the first tests I did when I got it.
It's my only ZNAP set. I bought it because of the motor, the flex and those
wheel/"turbine".
From what I remember, it doesn't work that well. It's too tiny. It only
makes a little breeze.
I think it could make a water propeller though, using the flexible drive
shafts to keep the motors safe from the water. I never tried it... yet.
I'm keeping my LEGO away from the water for now. At least as long as I can
think of "dry" projects ;)
> functional, but if they were, you could put them in vertical ducts,
> driven by the ZNAP flexible drive shafts to float the skirts.
>
> Ground effect vehicles require quite a bit of power-to-weight,
Yeah, I know :( ...but at least if it could lift the "frame"+motor(s?).
With all the batts offloaded from it.
erm... <dream> If only LEGO could make some LEGO electric "turbo" air
generator like those found in micro-dust-blowers (I don't know the proper
name) and a LEGO rubber "skirt"... </dream>
> and I'm not sure if this will fly. I suspect you'd have to cheat
> and use a more powerful motor/rotor combination than pure Lego
> can offer.
The keyword here (for now) is "powerful motor". Maybe the new RC-Buggy
motors could drive a fan fast enough for a decent air flow.
I don't own that set (yet?), so, I'll make some tests with the other two
types of motors, at home, tonight. I'll try LEGO and non-LEGO fan/blades.
mc.
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On Tue, Nov 26, 2002 at 04:44:31PM +0000, Marco Correia wrote:
> erm... <dream> If only LEGO could make some LEGO electric "turbo" air
> generator like those found in micro-dust-blowers (I don't know the proper
> name) and a LEGO rubber "skirt"... </dream>
Hi,
I'm not sure whether this would work or not but one possibility is using an
inner tube from a mountain bike tyre. They are strong, reasonably light and
look to be just the right size. Also small holes could be made on the inside of
the skirt to blow air in to the underside (as mentioned by someone else). As
for the motor/fan issue then I'm not sure but I guess model aeroplane shops
would be the best bet. Ducted fan models of fast jets are quite popular but I
think the torque required to drive one would be quite high.
Cheers,
Lee
PS The inner tube would have to be cut to make it a smaller diameter but it
should be reasonably easy to glue the two ends together.
--
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leep@bogus.net DOC #25 GLASS #136
You can never break the chain
There is never love without pain - Secret Touch, Rush
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