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$100 EDF Scratch Build Contest Flying Wing

Old 10-09-2014, 05:42 AM
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CHELLIE
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Build Review $100 EDF Scratch Build Contest Flying Wing

Hi Everyone For the contest, I will be Scratch building a 70mm Flying wing, I never Hot wired a Wing before from Foam, so this will be a learning Experience for me, Wish me luck The wing will have a 40" Wing Span, winglets at the tip, Spanning both on top and bottom of the wing, and a launch/Skid on the bottom in the middle, The Skid and Winglets should keep the bottom part of the EDF off the ground, as the EDF will be in the center line of the wing rather than just laying on top of the wing, I am making the Pattern for the wing so i can hot wire the foam, The wing will have about a 35 Degree Sweep, the power system will be a 2839-3000kv motor, 60 Amp ESC, 4 cell lipo, 2200 mah 30C, 70mm EDF, 5 Blade Fan, 2-9 gram high torque Turnigy Servos, the control surface will be made from Formed Balsa Aileron Stock, Thats the Idea anyway Take care and have fun, Chellie





Last edited by CHELLIE; 10-09-2014 at 10:49 PM.
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Old 10-09-2014, 06:33 AM
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Great Job Chellie. I was thinking of building something similar but I think I will watch yours. (better chance of success than I)
Signed up, good luck and looking forward to the progress
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Old 10-09-2014, 06:51 AM
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All right! Another entry! And leave it to Chellie to come up with something that isn't just the same as those other wings. I like that. Looking forward to seeing it. Good luck Chellie!
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Old 10-09-2014, 07:00 AM
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Originally Posted by Fishbonez View Post
Great Job Chellie. I was thinking of building something similar but I think I will watch yours. (better chance of success than I)
Signed up, good luck and looking forward to the progress
Thank You Fish

Originally Posted by xmech2k View Post
All right! Another entry! And leave it to Chellie to come up with something that isn't just the same as those other wings. I like that. Looking forward to seeing it. Good luck Chellie!
Thank You Mech I am Hopeing this will be a 100 MPH + Wing might need a 5 cell lipo for that
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Old 10-09-2014, 07:08 AM
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Made a paper pattern for the Formica template, this will be a symmetrical wing Cord, I Just Traced my Shoe Sole For the Pattern LOL, Just Kidding, I got it off the net, and made it a little bigger and Thicker, as I want to bury the lipo and esc into the wing to keep it clean for Subsonic Flight



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Old 10-09-2014, 07:17 AM
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The wing will look like a cross between these 2 wing Styles, I belive one is a 45 degree sweep and the other is a 30 degree sweep Wing, my wing will have about a 35-37 degree sweep. I will have to use the TLAR method



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Old 10-09-2014, 12:45 PM
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My Foam Came in Yesterday, Sooooo I am going to Draw out the Wing on the Foam to see how it will Look, Hmmmmm Not to Shabby Here are a couple of Pics, Now I just need to get my Hot wire set up, make the Formica pattern and Start Cutting Foam





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Old 10-09-2014, 04:44 PM
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Old 10-09-2014, 10:43 PM
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Originally Posted by Fishbonez View Post
Great Job Chellie. I was thinking of building something similar but I think I will watch yours. (better chance of success than I)
Signed up, good luck and looking forward to the progress

Fish IMHO, you can build any Rc Aircraft and be successful at it
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Old 10-10-2014, 03:23 AM
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Originally Posted by CHELLIE View Post
Fish IMHO, you can build any Rc Aircraft and be successful at it
Thanks for the vote of confidence Chellie but don't think even with years of experience could I come close to the skills you and many others have here at Wattflyer
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Old 10-10-2014, 03:25 AM
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Originally Posted by Fishbonez View Post
Thanks for the vote of confidence Chellie but don't think even with years of experience could I come close to the skills you and many others have here at Wattflyer
Its just practice, practice, Practice, Build, build, build
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Old 10-18-2014, 03:05 AM
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Well, I guess I better get Off My Big Behind and Start Building My EDFs and BSI Glue came in the Mail about 30 mins ago Off to Hot wire the foam wing Now, Wish me luck, as this will be a first for me to hot wire a foam wing Take care, Chellie
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Old 10-18-2014, 06:01 AM
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I Epoxied a paper pattern that I made to a piece of Formica, now I have to cut it out and sand it and drill a few holes in it, so i can stick some long nails in the pattern to hold it to the foam, the pattern will be my guide for the hot wire to cut the foam with, I watched some You Tube videos on how to hot wire cut wings, I think I can do it too I am Not Afraid to try anyway

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Old 10-18-2014, 06:28 AM
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Good luck, ma'am!
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Old 10-18-2014, 08:35 AM
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Thank You Mark your Bat Wing flies great, Good Job on it, But i thought I was suppose to do the Maiden Flight on It Take care, Chellie
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Old 10-18-2014, 08:58 AM
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Here is the Formica pattern with holes drilled in it, Dang, That Formica is tough to sand, I cut it close to size, then sanded it, took 2 sheets of 100 grit sand paper to get it to shape and smooth and about 1 hour of sanding its done anyway will hot wire the Foam tomorrow after I go Flying Take care, Chellie


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Old 10-18-2014, 10:54 PM
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I have had zero luck in my hot wire cutting attempts, but I'm sure you'll do better.
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Old 10-19-2014, 08:13 AM
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Chellie, I have no experience with foam cutting but I do understand how heat effects foam. I was wondering, Why formica for the templates? Why not some 1/8" Plywood? Some material easier to work with, shape and sand. That hot wire is going to go through that foam so fast it will barely brown a wood template let alone damage it. Or am I wrong or missing something?
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Old 10-19-2014, 01:00 PM
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Originally Posted by BroncoSquid View Post
Chellie, I have no experience with foam cutting but I do understand how heat effects foam. I was wondering, Why formica for the templates? Why not some 1/8" Plywood? Some material easier to work with, shape and sand. That hot wire is going to go through that foam so fast it will barely brown a wood template let alone damage it. Or am I wrong or missing something?
Hi from what i have read, Formica is best to use, heat wont affect it, and when its sanded, its hard and smooth, so the wire does not catch on the pattern and jump, I am no expert too, I Have just researched hot wire cutting untill I was blue in the face and it seems thats what a lot of people are using, that and metal. I need to buy a cheapy flat door for a cutting jig, as i have to extent the wire beyond the foam to cut the out side of the foam on the other side of the pattern, here I come Lows Hardware Take care and have fun, Chellie

The guy in the video is using a inside pattern Guide i am using a outside pattern guide.

[media]http://www.youtube.com/watch?v=R0ZCnR_g6ZU[/media]
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Old 10-19-2014, 04:43 PM
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Old 10-19-2014, 10:34 PM
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Yep formica wont melt and the wire slides smooth across it while cutting through foam . I have a old wire cutter made from a larger american flyer train transformer and it worked great . I would cut out a honey comb pattern in my pattern birds wings to make it lighter then cover the wing with thin balsa sheets . It did nothing for me to compete in pattern flying except make it lighter for vertical manuvers and keeping speed up going vertical back then was half the battle. Good luck on your build Chellie ! joe
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Old 10-19-2014, 11:19 PM
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Thank you Joe I have a Marx Train transformer, it works good on my smaller hot wire cutter, hope it is strong enough to do a wing cut, if not, I have an Adjustable 12V, 30 Amp motor speed controller, that I can hook up to a car battery to cut the wing out with, I think that should do it, if the Train transformer does not work,

DC MOTOR PWM SPEED CONTROL 30A MAX 12V / 24V 100 Hz






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Old 10-19-2014, 11:36 PM
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[media]http://www.youtube.com/watch?v=kF-s4xmaDnQ[/media]
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Old 10-19-2014, 11:40 PM
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The main thing to do is keep it moving slowly but steady and dont stop once you get the wire hot enough . If you start and stop it that will mean a bunch of sanding . Good luck girl ! joe
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Old 10-20-2014, 04:24 AM
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Looking good there. Speaking of the marx transformer, I still have the train set that came with mine. Best of luck.
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