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Old Jan 07, 2013, 11:37 AM
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Concorde twin 55mm EDF

Hindthought about Concorde:

It would be nice to build a bigger, twin 64mm or twin 70mm EDF, larger scale, with retract and nose-dropping features. Of course, make her nose and/or tail detachable for transport.

She is fairly easy to fly even underpowered. I learned to turn her without losing too much altitude. It is better to lose some speed than to lose altitude. Airfoil should not be that complicated. Even flat airfoil should be fine, although I did carve some undercamber right behind the LE.

My build is a little too heavy so I add some power for landing. Well which manufactured EDF don't need power for landing? At least most of mine EDF need power to land anyway.

I use the nose from a foam glider as Concorde nose, all the rest mainly use Blue-cor, 6mm Depron with carbon rod reinforcement for only v-stab. Peel off the skin from the Blue-cor makes it easier to glue and bend.

The wing is mainly glued together from overlaid two sheets of Blue-cor, with three reinforcements across the wing. On top of this, I use one 3 feet long ~10mm diameter CF tube to reinforce the fuse. The full scale is so long that the passengers sitting at both ends of the plane can see the bending of the fuse when the plane was turning at speed. I use nichrome wires to join the CF tube and the CF strip. I used bamboo skewers to reinforce the front part of the wing, to save the cost.

The blue-cor sheets were prebent to feature the famous Concorde anhedral. I use a rod with ~2" diameter to roll over the peeled foam sheet upon sofa pad. There is at least online video showing the technique.

Another feature in my build is the use of carefully applied masking tape for added strength and look. Beware that the tape might get wrinckled after applying water-based paint and the paint might not hold well if the tape is not sanded. Also the end of the tape might peel off on its own over time or even right away. Use some foamsafe CA or GWS glue to seal the ends of the tape.

These are some of my thoughts on the build. Don't have the time to start a build thread in RCG.

More photos from Ron Keith at circlecityfliers.com:
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Last edited by edwen303; Jan 11, 2013 at 09:48 PM.
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Old Jan 11, 2013, 09:51 PM
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more build photos

Here are some photos I took during the build.
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Old Jan 12, 2013, 01:50 PM
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Holmes PA
Joined Jan 2010
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Really Cherry Edwen my buddy is building a couple Concordes to, she looks great in the air!
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Old Jan 15, 2013, 01:02 PM
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Quote:
Originally Posted by MrConvair View Post
Really Cherry Edwen my buddy is building a couple Concordes to, she looks great in the air!
Thanks MrC! Keep me posted about your buddy's build. The key is building her light or more power. I wish I can have >500W for this 2.5 lb bird.
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