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Old Sep 05, 2002, 10:27 PM
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Diamonds Anyone??

I came across an exciting design for a plane. It's called the Diamond. It's originally a slope plane, however I'm thinking of powering it with my S400. What sould the dimensions be to make this work? Here's the picture that got me hooked.


PS: I don't have plans for this just some pictures.
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Last edited by snow_bird; Sep 05, 2002 at 11:42 PM.
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Old Sep 05, 2002, 10:41 PM
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Finally....here is the picture
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Old Sep 05, 2002, 11:44 PM
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Here are more pictures

Here are more pictures
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Old Sep 05, 2002, 11:44 PM
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and another...
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Old Sep 05, 2002, 11:46 PM
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the last one. Just in case you're wondering, I do plan to build it with foam.
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Old Sep 05, 2002, 11:48 PM
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forgot I had another....
If you have more pictures that could help in the building that will be great.
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Old Sep 12, 2002, 04:49 PM
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Heath
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Up and flying!

After looking at these pictures I decided to take up the challenge and try to build a foam replica. Well my new foam diamond flies. The dimensions I used are 9" center cord by 10" length, tapering to 7" at the mid wing bend, to 4" cord at the wing tips 14" from wing bend to wing tip. I was shooting for 15 deg up angle for the wing, and 30 deg angle for the stablizer. Just a guess from looking at the pictures. The power system is a 1700mha zagi flight pack, 20 amp ESC, gunter/zagi prop and a speed 480 motor. I am sure a speed 400 will work find with this set up as well. Two mixed servos HS-55 size out on the flat section for control surfaces.
I used a MH-45 airfoil, and the plotting program Profili to make the wire guides for the wing cores. I placed a carbon fiber rod along the top center point of the wing. The bends in the rod are tied with braided fishing line, but they are flexing at the joints, so my wing is flexing. Any one have any ideas on how to make the spar on a bent wing like this solid at the bends were one rod meets the other? I may try replacing it with a wood spar that I can sand the right angle into and glue.
Still needs some testing, playing with the center of gravity, and I think wingloading is a little highter than my Zagi 400X. But it does loops, rolls and will fly inverted.

By the way were did you get all the pictures from?

I will post a picture when I get one, I really need to get a digital camera.
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Old Sep 12, 2002, 07:14 PM
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Thanks for your interest in this. I was begining to think that there weren't any takers for this project. I've also given the design a try. However I used some cardboard. Just to see what might work. You're really far a head.

I too had problems with the wing. However I thought that using foam might make things easier. Looks like I'm wrong. The wooden spar sounds like it might just work.
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Old Sep 12, 2002, 07:58 PM
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Weblink

I forgot to include the website link before. Here it is

http://homepage.mac.com/trevorhewson...nd/dreview.htm
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Old Sep 12, 2002, 08:08 PM
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The effect is sadly temporary
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Pusher?

Salin,

Did you put that motor in the Front? or the Rear? I've had trouble getting pushers without much sweep to balance. Maybe you're using really heavy batteries...

I'd love to know. I though this plane was great when I first saw the pics...

Snow_Bird,

Looks like a great candidate for Fan-Fold. (But then I think that about everything these days....)

-Dan
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Old Sep 12, 2002, 08:19 PM
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EFlight=Fun,Big-T=BIG FUN
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I have seen pics of this plane in a magazine somewhere some time ago.
Does anyone know what magazine? May be even year/month?
Maybe they have plans for it.
Curious,
Bernard "Crash" Siegel
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Old Sep 12, 2002, 09:23 PM
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Re: Up and flying!

Quote:
Originally posted by Salin
The bends in the rod are tied with braided fishing line, but they are flexing at the joints, so my wing is flexing. Any one have any ideas on how to make the spar on a bent wing like this solid at the bends were one rod meets the other? I may try replacing it with a wood spar that I can sand the right angle into and glue.
Still needs some testing, playing with the center of gravity, and I think wingloading is a little highter than my Zagi 400X. But it does loops, rolls and will fly inverted.

By the way were did you get all the pictures from?

I will post a picture when I get one, I really need to get a digital camera.
What I would do is use two carbon fiber rods, then use a metal joiner that is premade at an angle like a V. If you dont know what they look like, they are used on a Mini-Max to join the spars on the leading edge of the wing. That way, you can still use Carbon Fiber.

Just an idea.

Good Luck,

Brian
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Old Sep 12, 2002, 10:24 PM
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Quote:
Originally posted by bjsiegel@texas.net
I have seen pics of this plane in a magazine somewhere some time ago.
Does anyone know what magazine? May be even year/month?
Maybe they have plans for it.
Curious,
Bernard "Crash" Siegel
It was a Construction article originally appearing in RCM&E September 1991 according to the original designer.
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Old Sep 13, 2002, 06:47 PM
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Thanks.
Is RCM&E now RCM?? Would the plans still be available?
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Old Sep 13, 2002, 07:16 PM
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ERK! Google found RCM&E here:
http://www.radiocontrolmodels.co.uk/...s_frameset.htm

Sent an email to customer service about the RCM&E September 1991 Diamond construction article and plans availability.
Will let y'll know if I hear anything (proably next week).

Ain't the web wonderful?!

Bernard "Crash" Siegel
San Antonio Prop Buster
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