Shop our Airplanes Products Drone Products Sales
Thread Tools
Old Mar 28, 2004, 03:16 PM
ericfly is offline
Find More Posts by ericfly
Registered User
ericfly's Avatar

14 ft wings: how to get it strong yet light?

Hi modelers,

I'm going to make wings for a scale-like (it is based in an experimental sailplane) 4.2 meter (13.7 ft) sailplane. A friend gave me the fuse (just epoxi/fiberglass) and I'm going to do the rest of the job.
Since I never built a wing that size, I would like some advice.
I intend to make the wing from EPS foam and shape it with veneer and fiberglass or just fiberglass. I also intend to glue two carbon spars (above and below).
The aspect ratio is high, like a DG 800.
I do not intend to make winglets.
The resin will be epoxi, the wing panels will be 4: two 5ft each, the centre panels, and 2 tip panels (almost 2 ft each).
The questions are:
Which shaping do you recommend: veneer/fiberglass, just venner or just fiberglass?
How much CF should I use for the spars (i.e. 15mm x 1 mm)?
Which main wing joiners would you recommend (there will be 3: 1 at the centre, 2 at the tips)? From aluminum tube, or carbon fiber spar-like (rectangular, not-hollow) or other way?

I want that plane to fly in the slope, but fly in some thermals and be capable of high speed passes and some aerobatics (the wing must be strong).
The man who made the fuse I won told me to use an airfoil of the EH family. Which airfoils would you recommend?

Sign up now
to remove ads between posts
Old Mar 28, 2004, 04:12 PM
Sled Driver is offline
Find More Posts by Sled Driver
Knowledge increases life's FOV
Sled Driver's Avatar
Unless you have a lot of time and good workshop, I'd suggest that you consider buying a set of RnR SBXC wings. RnR's website is:

I purchased one of their SBXC wings and I'm reasonably satisfied with the overall quality, performance and cost.
Old Mar 29, 2004, 02:03 PM
ericfly is offline
Find More Posts by ericfly
Registered User
ericfly's Avatar
Hi monkeytumble,
Thanks for the tip, but the cost the import the wing set would be quite high. It would get to something like US$1400, in Purchase Power money.
I do have a workshop, and I just love to build models. I don't have a lot of time, but I'm not in a hurry to finish the model. I intend to make it in holidays and vacations.
But thanks for your attention.

Old Mar 29, 2004, 08:52 PM
schrederman is offline
Find More Posts by schrederman
Hot Dawg Glider Pilot
schrederman's Avatar

Look at the spar in the Houston Hawk. The .060 X .5 carbon fiber makes the wing almost indestructable. The same company makes a tapered spar cap material that starts at .060 thick and tapers out to .014 thick in 6 feet. Four of those with .5 inch vertical grain webbing would make for a pretty strong set of wings. That would also stress your wings equaly for positive and negative loads. With the wings that long and with the anticipated high loads, you might want to consider adding a touch more thickness to the root areas. Be sure to wrap this at the root section at least.

Good luck with it.

Jack Womack
Old Mar 29, 2004, 09:28 PM
portfoxdesign is offline
Find More Posts by portfoxdesign
Only Scale tastes nice!
portfoxdesign's Avatar
eric fly
try emailing some of the manufacturers of similar spanned gliders. The Guy from EMM is very informative.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion How to get the wings sheeted in Autocad 2005???? Mato The Builders Workshop 1 Nov 03, 2006 05:46 PM
Question how to get light f3p planes suhonen91 Indoor Pattern/F3P 16 Nov 01, 2006 10:05 AM
How to get a camera to 1500 ft+ in 8 seconds 2bent Aerial Photography 30 Mar 30, 2005 11:55 AM
How to get packaging tape to stick to my wings?? jimklein Foamies (Kits) 8 May 14, 2004 02:08 PM
Zagi - How to get out of death spiral Clifford B Electric Plane Talk 6 Oct 14, 2001 03:24 PM