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Testing on garage?

Old 04-05-2018, 07:19 PM
  #1  
thormj
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Default Testing on garage?

I'm thinking of playing with a big-ass fan and motor (eg, https://hobbyking.com/en_us/dr-mad-t...-watt-10s.html , with a https://hobbyking.com/en_us/aerostar...-esc-opto.html)

How would you test such a beastie in my garage (I have a 50A 220V line that I usually use for welding)? Does anyone make an inexpensive (err... <$1k) power system for checking out 12S components?
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Old 04-06-2018, 03:40 AM
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Wildflyer
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You would need a power supply capable of 40 vdc, at 175 amps.

MAYBE, a DC arc welder could put out that kind of power but it might not be regulated very well. I would think a power supply of that size would be very expensive, probably more than a set of large Lipo batteries.

Maybe put 3 large car batteries in series. $300-$500

What do you plan on using this EDF for? it would not make a reasonable fan in a garage.
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Old 04-09-2018, 09:21 PM
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thormj
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Not for a "usual fan"... but I've been dabbling in RC for a while and my day job http://www.captor.com makes airflow and waterflow sensors.

The boss is trying to build a test bench out of a single-phase induction motor (which is a no-no to me because it gets really hard to control the speed of), so I thought... hey, an EDF would probably work (200 ft/s target speed) -- but the specs are so foreign between the HVAC guys and the hobby guys that he doesn't think it'll work.

And we'd still have to power it. I can rig up an arduino for controlling the ESC, but getting 175A at 48V... well that's not in my expertise... that's real power at low voltage... I'll take a look at my stick and mig and see what they do (though, like you said -- that's an entirely different class of "regulated".)
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Old 04-10-2018, 08:26 AM
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Wildflyer
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200 fps = 136.4 mph

That really shouldn't be very hard to do.

I have a F-16 with a 485 watt EDF
It gets gets close to 90 mph and it is not a high end plane.

Tapering the exhaust tube slightly will increase the airspeed, but I don't remember how far you can go. It maybe reducing the area by 10% or so.

I have to admit, we get new guys on here that think they can start with a fan setup like you are thinking about, before they even know how to fly.
If you had explained what you want to do with this you probably would have gotten more answers.
I was sort of bored that day so I thought I would give it a try.
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Old 04-11-2018, 02:14 AM
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CHELLIE
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Maybe this might work for you.

http://www.garbermetrology.com/wind-...ture-and-more/

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Old 04-11-2018, 02:24 AM
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https://www.sciencebuddies.org/scien...-a-wind-tunnel
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Old 04-11-2018, 02:28 AM
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https://www.stlfinder.com/model/wind...feI3US/4884656
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