12-16-2011, 03:01 PM
Join Date: Jul 2007
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Stabilize wings when building with EDF?
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!
12-16-2011, 04:17 PM
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Thanked 408 Times in 401 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
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:
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12-16-2011, 05:02 PM
Join Date: Jul 2008
Location: Cheshire, UK
Thanked 51 Times in 50 Posts
Club: A lone flyer!
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.
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.
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