stunthanger.com
General control line discussion => Open Forum => Topic started by: Pat Johnston on January 22, 2025, 04:42:24 PM
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I got kind of excited and made up a QED 502. This is relatively similar to my QED design article published in the October 1998 MA edition. I made all the current updates including the "+P" airfoil, and new construction techniques. I flew the heck out of my original QED. It was a great flying plane and really fun to see the reaction of its presence. This one is no "lawn dart". The fuselage is 6" deep just in front of the canopy so has some serious side area. With a Badass 2814-870kv, swinging an 11-5.5" prop, the results are potent. I'll attach the PDF's for your viewing pleasure. Feel free to ask about details.
Pat Johnston
502 Design Studio
Idaho Skunk Works
P.S. I also just designed a Gee Bee R2-502
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Hi Pat, have any photos of your finished model? I assume you are cutting this as a kit or short kit?
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I can find a photo of the old QED if you like. Kit price should be $225.
Pat
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I got kind of excited and made up a QED 502. This is relatively similar to my QED design article published in the October 1998 MA edition. I made all the current updates including the "+P" airfoil, and new construction techniques. I flew the heck out of my original QED. It was a great flying plane and really fun to see the reaction of its presence. This one is no "lawn dart". The fuselage is 6" deep just in front of the canopy so has some serious side area. With a Badass 2814-870kv, swinging an 11-5.5" prop, the results are potent. I'll attach the PDF's for your viewing pleasure. Feel free to ask about details.
Pat Johnston
502 Design Studio
Idaho Skunk Works
P.S. I also just designed a Gee Bee R2-502
Hi Pat
I didn't see any dihedral on the plan. Did you give it some diehedral?
Thank you, Jerry
PS: This is one of the planes that i was interested in when I got back into CL back in the '90's and the one that I was looking at has diehedral. Cheers
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Very nice Pat!
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Jerry,
The plan has a note that says "1 Inch dihedral per panel."
Dave
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Jerry,
The plan has a note that says "1 Inch dihedral per panel."
Dave
Perfect! Thanks Dave.
Jerry
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One inch of dihedral for sure. With the wing in close to the correct position, the dihedral makes both wingtips fly level. I really liked the way the original flew, and it had an impressive presence.
Pat
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What foam do you use? How thick? Where do you buy? Home Depot? Does the foam core create vibration issues when used with IC? Is the sandwich more rigid then balsa?
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The foam comes from Home Depot or Lowe’s. The overall result seems to be a relatively stiff and very light fuselage. Haven’t noticed any vibration issues.
Pat
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Pat, is there a thread where your airfoil is discussed? I used that airfoil in the 60's through the late 70's on my most successful planes but I had no idea why. It was just easier to cut the ribs and sheet the wings. I have been watching Crist Rigotti's Agenda series using your airfoil and noticing how they flew like my earlier designs. I am more interested in the "why" now then I was then.
Ken