Thread Tools
May 27, 2013, 02:37 PM
Registered User
Thread OP

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
Sign up now
to remove ads between posts
May 27, 2013, 06:26 PM
Registered User
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.
Latest blog entry: Digital LED Voltmeter
Jun 02, 2013, 09:13 PM
Vertical Arrival Specialist
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
Registered User
Thread OP
Is a small blade fan faster then a larger fan with the same rpm?
Jun 02, 2013, 10:57 PM
Registered User
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.
Latest blog entry: Digital LED Voltmeter
Jun 03, 2013, 08:01 AM
Registered User
flypaper 2's Avatar
An old saying says "there's no replacement for displacement"

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
Registered User
Thread OP
It was made for a gws edf 75

Quick Reply

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Things to Check on an ARF aeajr Beginner Training Area (Aircraft-Electric) 14 Jan 29, 2014 10:09 AM
Poll in the scheme of things what do you consider yourself POWERGROOVES Life, The Universe, and Politics 16 Apr 02, 2013 07:40 AM
Discussion Intake thrust of an EDF; and EDF thrust reverse kcaldwel Modeling Science 32 Nov 11, 2011 07:58 AM
Discussion Things to consider when building your EDF power system mikes68charger Electric Ducted Fan Jet Talk 32 Dec 08, 2010 10:04 PM
How to maintain the thrust line when using an outrunner on a stick mount eran_k Power Systems 5 May 24, 2005 01:22 PM