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May 27, 2013, 02:37 PM
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Discussion

is thrust the only thing to consider when selecting an edf?


i am putting together a old park jet i have found two different edfs to use one is a 50mm sunchange 11 blade with 14 ounces thrust the other is a 70mm 8 blade fan with 25 ounces thrust both pull about the same amps the 70mm is about 5 amps more. should i go with the larger fan, is there any reason to go with the smaller one? here is the plane
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May 27, 2013, 06:26 PM
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fredmdbud's Avatar
It's a no brainer - the 70mm is more efficient with more thrust for the same amps.

The only reason I can think of going with the smaller one is if it's the only one that will fit.

But looking at the plane you want to power - I don't know if it would be able to survive, might disintegrate in the air past 3/4 throttle and a sudden maneuver.
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Jun 02, 2013, 09:13 PM
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clinth01's Avatar
50mm fan unit would be lighter, and may be better in that airframe with reduced thrust. Keep the weight down and it should fly.
Jun 02, 2013, 10:35 PM
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Is a small blade fan faster then a larger fan with the same rpm?
Jun 02, 2013, 10:57 PM
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fredmdbud's Avatar
If blade count and blade pitch are the same, no, the small blade will not provide more thrust than a larger one at the same rpm.
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Jun 03, 2013, 08:01 AM
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flypaper 2's Avatar
An old saying says "there's no replacement for displacement"

Gord.
Jun 03, 2013, 11:48 AM
Foam addict
4stripes's Avatar
that plane looks very light and fragile.
What size fan was it designed for? No point putting in an oversize fan if the plane can't handle the power.
Jun 03, 2013, 10:17 PM
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It was made for a gws edf 75


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