SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old May 15, 2011, 05:01 PM
fly the pants off it!
lando211's Avatar
Joined Jan 2009
868 Posts
Question
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 http://shop.rc-electric-jets.com/SAP...T-SAP30732.htm 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.
Questions
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?
lando211 is offline Find More Posts by lando211
Reply With Quote
Sign up now
to remove ads between posts
Old May 15, 2011, 07:34 PM
Vertical Arrival Specialist
clinth01's Avatar
Townsville, Australia
Joined Sep 2009
319 Posts
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'.
clinth01 is offline Find More Posts by clinth01
Last edited by clinth01; May 15, 2011 at 07:45 PM.
Reply With Quote
Old May 15, 2011, 08:33 PM
fly the pants off it!
lando211's Avatar
Joined Jan 2009
868 Posts
cool thanks, I did just find that I can do a 5s pack on sapac website that should make a huge change
lando211 is offline Find More Posts by lando211
Reply With Quote
Old May 15, 2011, 09:38 PM
Aka: Tom Jenkins
ApexAero's Avatar
Palm Beach County, Fl.
Joined Aug 2008
4,439 Posts
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.
ApexAero is offline Find More Posts by ApexAero
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
For Sale NIB Sapac 70mm edf with motor (for 4s) splitpilot Aircraft - Electric - Jets (FS/W) 11 Aug 06, 2011 07:35 AM
Discussion I just bought the Nitroplanes 420jet Need some advice on power set up sherlockshah Electric Plane Talk 0 Apr 26, 2011 09:38 PM
Discussion Need some advice on some RC questions Ramidan DIY Electronics 7 Mar 15, 2011 10:55 AM
Discussion Need some advice on Converting a yellow aircraft f-16C to EDF fenderbean Electric Ducted Fan Jet Talk 3 Mar 07, 2011 06:50 PM
Help! 2 EDF Newbs need some advice!! - Sapac MB1 Silverstreak328 Foamy EDFs 68 Apr 03, 2010 05:02 PM