Need some advice on my setup sapac 70mm EDF - RC Groups
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May 15, 2011, 06:01 PM
fly the pants off it!
lando211's Avatar

Need some advice on my setup sapac 70mm EDF

Ok this is not the normal EDF. This question has to do with a Queen Bee 100" wing that I converted to powered. I put a sapac 70mm EDF says over 900 watts with a 4s pack. I can only get 700watts out of the fan with a 4s 3300 30c pack. So I need a few ways to get a bit more power. My wing is 5.5lbs and does well but I need a bit more. I am not trying to make it fast just want it to have a bit more thrust.
1- do you guys know if you can go 5s with this fan and motor?
2- if the fan is just free on top of the wing does it have less power?
or does it need some type of tube in front and back?
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May 15, 2011, 08:34 PM
Vertical Arrival Specialist
clinth01's Avatar
Inlet ring/lip on the front end would help a bit - that sharp edged inlet will be robbing a bit of 'oomph' from your setup.

By eye, your plastic cup doesn't look to achieve much less than FSA - try making it a bit longer and get the rear opening down to 85 - 90% FSA.

Also, the blurb recommends weights up to 4.2 lbs - your 5.5 lbs is about 30% over that, which may account for it being a bit 'sluggish'.
Last edited by clinth01; May 15, 2011 at 08:45 PM.
May 15, 2011, 09:33 PM
fly the pants off it!
lando211's Avatar
cool thanks, I did just find that I can do a 5s pack on sapac website that should make a huge change
May 15, 2011, 10:38 PM
Aka: Tom Jenkins
ApexAero's Avatar
2.25" or 58mm exhaust exit would give you thrust and speed. The radius-ed inlet lip will really smooth out the air, ad your spinner and tweak it to balance by rotating it a fuzz till its smooth too.

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