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Jan 30, 2005, 10:51 PM
Why aren't you out flyin?
colbyweb's Avatar
I watched the video, looks like it flies very well indeed
I guess I HAVE to build one of these.... do you mind if I draw up some plans and post them?
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Jan 30, 2005, 11:12 PM
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ldammann's Avatar
colby

The CF tube is only 3mm. The wings are 2mm but with the bipe design, its very stiff. The tail is 3mm. The X2 flys fine, its my big wing standard tail Gym-Blu with the same CF tube that I'm having trouble with.

Yes, draw up some plans.

I think a lot could be gained by setting the two wings at a proper angle and a proper camber foil. I just used the LAR method. If I do another one, I would make the wings even bigger. I kept them small because I was worried about the strength of the 2mm depron. The desgin is plenty stiff so could handle larger wings. If you don't want to mess with the adjustable incedence, so far I found about 3 deg. to be the best for in the gym. At 0 deg. it flew fast and flat, maybe better for outdoor. At 6 deg. it wanted to lock into a harrier all the time.

Oh, and by the way, the plane probably flys better than it looks in the vids. I have only been flying for a year and that was my second time in a gym. Walls and hoops can be very intimidating!

Lee
Last edited by ldammann; Jan 30, 2005 at 11:28 PM.
Jan 31, 2005, 10:22 AM
Why aren't you out flyin?
colbyweb's Avatar
Lee, is the X tail the same size as the V tail x 2? I need to know the dimensions to draw the plans. I think I can figure out the rest of it, but the X tail looks a little smaller (as it should be).
-Rick
Jan 31, 2005, 11:48 AM
Registered User
ldammann's Avatar
colby

yes the upper x-tail is smaller. If I remember, I took my wingspan 20" vs Genes at 28" which was a 3/4% reduction. Then shortened the v-tail plan by 3/4%, and did a LAR on the lower tail (its about an inch shorter yet. If you want I can give you measurments when I get home.

I would just draw it to get an equal combined area as the standard v-tail with the lower being a little smaller. That is one thing I will be playing with, the ratio of top to bottom area. Maybe they could be equal.

The next area to look at is the wings. I don't know what relationship I have between them. Kind of hard to measure with the camber and cabans cut by hand using LAR. Maybe some stager would be good?

I'm looking forward to your plans (I assume their CAD) so I can build one with known dimensions.

Lee
Last edited by ldammann; Jan 31, 2005 at 11:54 AM.
Jan 31, 2005, 11:51 AM
Registered User
ldammann's Avatar
OOps, 3/4% should read 25%. Oh you know what I meant.
Last edited by ldammann; Jan 31, 2005 at 11:55 AM.
Jan 31, 2005, 01:08 PM
Why aren't you out flyin?
colbyweb's Avatar
Gotcha, that will be enough to go on. Yes they'll be CAD, I draw everything in Autocad.
-Rick
Jan 31, 2005, 06:09 PM
Registered User
ldammann's Avatar
colby

Can't wait. Any chance of sneek peeks??

Lee
Jan 31, 2005, 10:57 PM
Why aren't you out flyin?
colbyweb's Avatar
Oh, as soon as I have time to work on it
I'll get started on it tonite, but it will be late and I probably won't get far. Tommorow I plan to go flying first thing, then I have to be at the local high shool at 9am. Going to do some wind tunnel comparison testing of symetrical versus flat plate airfoils. Then I am doing volunteer work at the high school, going to help a young girl design, build and fly a rubber powered free flight plane. Then I have to take my son 100 miles away to see a doctor. Hopefully I'll be back home by 3:30 or so and then I can work on it some more
PM me your email address and I'll be happy to keep you updated with "sneak peeks" that way, I don't want to post half finished plans here. I should have it finished in a couple of days.
-Rick
Feb 02, 2005, 11:41 PM
Why aren't you out flyin?
colbyweb's Avatar
I've had a really hectic couple of days and haven't had time to start on these plans. I'm going to start them now. I'll keep you posted
-Rick
Feb 03, 2005, 12:57 AM
Why aren't you out flyin?
colbyweb's Avatar
ldammann, how long is your fuse stick?
-Rick
Feb 03, 2005, 07:04 AM
Registered User
ldammann's Avatar
colby

Same as Genes plan I think. I'll check tonight.

Lee
Feb 03, 2005, 12:05 PM
Why aren't you out flyin?
colbyweb's Avatar
Hmm, I've been trying to draw it out and using the stock length of fuse stick I am coming up with much too short a distance from the wing to stabilizer. Maybe you have a smaller wing chord? This is an awfully hard design to draw in CAD, but I'm having fun with it.
-Rick
Feb 03, 2005, 12:34 PM
Why aren't you out flyin?
colbyweb's Avatar
Maybe I got it worked out. Here's a preview of what I have so far. I haven't been able to duplicate your original shape exactly. I haven't drawn the wing camber yet either, this is only a flat representation for placement, I'll be adding the camber next.
Feb 03, 2005, 04:05 PM
Registered User
ldammann's Avatar
Not being able to duplicate my original shapes is probably a good thing.

Lee


Looking good by the way. Can't wait.
Feb 03, 2005, 04:12 PM
Why aren't you out flyin?
colbyweb's Avatar
But I think your shapes looked pretty good!


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