HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old May 20, 2012, 10:29 AM
Registered User
blueman's Avatar
Japan, Tokyo, Fussa
Joined Jul 2003
238 Posts
Build Log
FSW EDF 50mm

Hello all, I think it's been about 7 years since I've been here on rc groups. Been busy and kinda fell out of the hobby. So this is what I am building to get back into the air. A custom eye-balled FSW with a Dons RC Wemotec/5400kv/30 amp esc/ 3cell -800mahx 2ea in parallel. Should burn a whole in the sky, I hope. A little dodgy on how to figure out the CG though, any input would be greatly appreciated, anything to help me from burying this in the dirt in 5 seconds.
blueman is offline Find More Posts by blueman
Reply With Quote
Sign up now
to remove ads between posts
Old May 20, 2012, 02:13 PM
Aka: Tom Jenkins
ApexAero's Avatar
Palm Beach County, Fl.
Joined Aug 2008
4,445 Posts
Blue man I can calculate your CG for you if you tell me the wing span, root, and tip measurements. Also accurate sweep measurement on main wing at leading edge. I'll volunteer.
ApexAero is offline Find More Posts by ApexAero
Reply With Quote
Old May 20, 2012, 08:27 PM
Vertical Arrival Specialist
clinth01's Avatar
Townsville, Australia
Joined Sep 2009
319 Posts
Blueman

Try this one. Select the 'Calculate CG' page and just follow your nose - it's pretty straight forward and intuitive.

Download and then rename the file extension fron .txt to .xls before opening (because I can't upload Excel spreadsheets here, but can do text files).


Clint
clinth01 is offline Find More Posts by clinth01
Reply With Quote
Old May 20, 2012, 08:49 PM
Vertical Arrival Specialist
clinth01's Avatar
Townsville, Australia
Joined Sep 2009
319 Posts
Bugger, the upload program is smarter than I thought, and refused to post the attachment.

I'll zip it up and send it from home tonight.
clinth01 is offline Find More Posts by clinth01
Reply With Quote
Old May 20, 2012, 11:16 PM
Vertical Arrival Specialist
clinth01's Avatar
Townsville, Australia
Joined Sep 2009
319 Posts
There you go Blueman.
clinth01 is offline Find More Posts by clinth01
Reply With Quote
Old May 22, 2012, 10:57 PM
Aka: Tom Jenkins
ApexAero's Avatar
Palm Beach County, Fl.
Joined Aug 2008
4,445 Posts
clinth, I couldn't get yours to work. Try this one
ApexAero is offline Find More Posts by ApexAero
Reply With Quote
Old May 25, 2012, 03:39 AM
Registered User
blueman's Avatar
Japan, Tokyo, Fussa
Joined Jul 2003
238 Posts
Sorry for the late reply, work has me jobbin'!
ApexAero- thanks for volunteering your experience/knowledge! I attached a quick drawing with some dimensions. I am not quite sure how to calculate the sweep angle, I dont even have a protractor or anything! haha. Would you happen to know how to calculate with triangles and all that greek math?

I tried plugging in numbers for your FSW CG calc, but the cg keeps coming out to around - .69-ish. That doesn't make sense to me... :P Maybe i need to take into account the center lifting surface from the front of the fan trailing back to the wing itself?

I havent added elevons yet, will I need to account for those as well in the dimensions?
blueman is offline Find More Posts by blueman
Last edited by blueman; May 25, 2012 at 03:48 AM.
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Sold LPU in San Antonio area: 50mm JPower EDF Jets FoamJunkE Aircraft - Electric - Airplanes (FS/W) 2 Jun 20, 2012 06:57 AM
Sold NIB 1.97 50MM EDF Housing warbirdguyn951 Aircraft - Electric - Power Systems (FS/W) 4 May 20, 2012 10:35 AM
Found Need 50mm EDF gasturbineman Aircraft - Electric - Jets (FS/W) 0 Mar 06, 2012 04:15 PM
Sold MB-1, Wemotec 50mm, JPower 50mm edf units FS FoamJunkE Aircraft - Electric - Power Systems (FS/W) 0 Feb 01, 2012 09:09 AM