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View Poll Results: Model platform
Delta 88 57.52%
Non Delta 65 42.48%
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Old May 15, 2011, 10:14 AM
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^^^^good point.

at the moment, it looks like a traditional planform is beating out the delta though. LOL.
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Old May 15, 2011, 11:45 AM
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Great thread, I have been watching closely, what about a taileron only control and something semi Military and twin fin?
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Old May 15, 2011, 11:53 AM
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Hi boomerang

You are more than welcome to poste some pic's as an examples of what you mean.
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Old May 15, 2011, 11:58 AM
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I think if it's going to be a sport jet, we should stay away from full scale. although, taking design cues and hints from full scale designs is always a good thing.
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Old May 15, 2011, 04:42 PM
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Lockheed found out that small and skinny, trapezoid shaped straight wings are the best for high speeds. This is seen on the F104, but the wing itself is impractical as it could not store fuel or landing gear.

The physics are not the same at our size and speeds though.
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Old May 15, 2011, 05:38 PM
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actually, a trapezoid works great at model scale too. the same reason why a delta works so well at model scale. the same also applies in the way they bleed speed in a turn. delta's bleed speed because of a loss of total available lift caused by turning up the wing trailing edge surfaces to change the aircraft's direction. by deflecting the surfaces, the high induced drag of this low-aspect ratio type of wing causes it to bleed speed during a direction change such as a turn . the only way to negate this effect, is to overcome it with the use of a close coupled canard. in the case of a trapezoidal wing such as the F-22 Raptor, they overcome it with the use of a rather large tailplane.

if you want to go faster, Delta is the way to go, but you have to manage how you get to that top speed. for example, in a speed contest without a dive, you have to manage your energy so that you can maintain speed through the initial turn in. this is where a traditional wing is better. however, a canard can make up the difference, so it needs to be decided on if we are going to go with a canard, or accept the energy loss of a none canard design.
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Old May 16, 2011, 07:19 AM
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I suppose it depends on how maneuverable you want your model to be, i would vote for delta wing planform as it generates a lot of life then traditional wing design yet on sharper turns it's bleeds off a lot of energy and up elevons would be needed to keep it flying at same nose angle while turns. I recently flew Concorde on G5.5 at LHS for good 30 mins, man it was tricky and interesting plane to fly!, she didn't wanted to land, it would get into ground effect and would keep on flying till you would abort landing for another approach!.....she did lost lift on sharper turns, but on longer wider turns, it was no problem to keep same altitude.....
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Old May 17, 2011, 01:45 PM
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I played a little with mr. boredoms fuselage and added a mix of trapezoid shaped and delat wings.
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Old May 17, 2011, 02:20 PM
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Quote:
Originally Posted by frank40 View Post
I played a little with mr. boredoms fuselage and added a mix of trapezoid shaped and delat wings.
What about forward swept?.........or something REALLY different like a box-plane???
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Old May 17, 2011, 03:01 PM
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Quote:
Originally Posted by SMorrisRC View Post
What about forward swept?.........or something REALLY different like a box-plane???
The focus of this thread shifted to a mix between a sport model and a speed demon.
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Old May 17, 2011, 03:05 PM
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I did my latest design with forward swept wings, and it work wery nicely. So I am all for that.
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Old May 17, 2011, 03:33 PM
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Frank's mod

I played too. couldn't help myself. first one is F-22 style. second is F-23 style.
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Old May 17, 2011, 04:20 PM
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I can make a coloring booklet if you all want me to.
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Old May 17, 2011, 04:29 PM
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I just got to thinking. What about a blended wing...like the sr71.

I made this when I was younger so excuse the cartooniness. I say narrow down the wings and give it an overall smooth job.
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Old May 17, 2011, 05:19 PM
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that's what you call a blended Ogival Delta. doesn't look too bad at all.
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