Wattflyer RC Network: RC Universe :: RCU Magazine :: RCU Forums :: RCU Classifieds :: RCU User Reviews :: RCU YouTube
Home Who's Online Calendar Today's Posts RealTime Post Spy Mark Forums Read
Go Back   WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > Electric Ducted Fan Jets
Register Members List Wattflyer Extras Articles Search Today's Posts Mark Forums Read Social Groups

Electric Ducted Fan Jets Discuss electric ducted fan jets here including setup tips, power systems, flying techniques, etc.

Thank you for your support (hide ads)
Reply
 
Thread Tools Display Modes
Old 12-16-2011, 03:01 PM   #1
sporren
New Member
 
Join Date: Jul 2007
Posts: 2
Thanked 0 Times in 0 Posts
iTrader: (0)
Friends: (0)
Default Stabilize wings when building with EDF?

Hi there!

This may seem as a bizarre question, but as a pusher-jet-builder moving over to EDF I'm really scratching my head...

On my usual builds (with pusher prop at the back) my foamjet wings are stabilized with a carbon fiber rod in both wings, trough the fuselage. It feels sturdy and the wings are very stable in the air.

When I began my first EDF model I realized that my usual technique may not be optimal; I'd have to push the rod right through the tube.

Is there some form of best practice here that I'm missing?
All thoughts appreciated!

/samuel
sporren is offline  
  Reply With Quote
Old 12-16-2011, 04:17 PM   #2
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 6,111
View solentlife's Gallery47
Thanked 261 Times in 258 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

What sizemodels are we talking about ? To be honest I have no CF in any wings or other in any model I have ... all in the parkflyer just under 1m wingspan.

My ME109 has a thin wood spar inserted into the wing out to half span but of course that's a low wing job and can be done.

My T45 which is pushing speed .. has NO spars or strengthening at all even though as a low wing - it could have been an option.

I think that most EDF's being jets have shorter low aspect ratio wings and therefore the moment arm is a lot less than a high aspect ratio long wing.

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is offline  
  Reply With Quote
Old 12-16-2011, 05:02 PM   #3
quorneng
Super Contributor
 
quorneng's Avatar
 
Join Date: Jul 2008
Location: Cheshire, UK
Posts: 1,241
Thanked 40 Times in 39 Posts
Club: A lone flyer!
Awards Showcase

Scratchbuilders Award 
iTrader: (0)
Friends: (7)
Default

Its one of the joys of EDF building - how to run a spar with a mid mounted wing.
Its the same problem in full size and the wing spar has in effect to be divided around the duct. Like this on the ill-fated Nimrod MR4.
Click image for larger version

Name:	MimrodMR4.jpg
Views:	42
Size:	49.5 KB
ID:	155573
Alternatively choose a plane with a wing that is placed above (eg Harrier) or below (eg BAE Typhoon) or has two sets of ducts with the wing between (eg EE Lightning) or as Solentlife has pointed out use no spar as such and rely on the natural strength of the material.
I hope this helps.


quorneng is offline  
  Reply With Quote
Reply

  WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > Electric Ducted Fan Jets

« Previous Thread | Next Thread »

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Building light vs. durability & Wing Loading vs. Stability payne9999 Scratch and Kit Built Aircraft 97 09-18-2014 09:27 PM
A glider with an internal EDF system GreenAce92 Hi-Performance and Sailplanes 22 08-11-2012 12:40 PM
ELERC Micro A-10 Warthog 30mm EDF Beta Test Joe 1320 Electric Ducted Fan Jets 13 02-02-2012 01:15 PM
Beginners Jet Phase 3 U2 Spy Plane EDF Glider Sale $199 RTF phillipmorris Beginners 10 07-09-2011 07:51 PM
How to Balance a EDF Impeller CHELLIE Electric Ducted Fan Jets 15 01-23-2011 04:07 PM


All times are GMT +1. The time now is 04:14 PM.


Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 WattfFlyer.com
RCU Eflight HQ

Charities we support Select: Yorkie Rescue  ::  Crohn's & Colitis Foundation



Page generated in 0.14559 seconds with 25 queries