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Author Topic: swept-wing canard drawing  (Read 882 times)

Offline minnesotamodeler

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swept-wing canard drawing
« on: September 15, 2010, 08:25:05 AM »
Next iteration of my canard project:

Swept-forward wings should alleviate the noseheavy condition.  Also fuselage is extended aft to render any tailweights more effective "just in cases".

Other numbers pretty much stay the same.

Larger wing (28" span, 7" nominal chord, = 196 squares) should be enough, even in inefficient canard layout.
--Ray 
Roseville MN (St. Paul suburb, Arctic Circle)
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Offline Tim Wescott

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Re: swept-wing canard drawing
« Reply #1 on: September 15, 2010, 09:27:14 AM »
Not much sweep -- will it be enough, based on your experience so far?

It seems like the rear landing gear is pretty far back to allow for rotation on takeoff.  Is this by design, with lift just accomplished by the stance?
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline minnesotamodeler

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Re: swept-wing canard drawing
« Reply #2 on: September 15, 2010, 11:26:50 AM »
The sweep amounts to 2", CL moving ahead 1".  I'm assuming that would also move the ideal CG 1" forward, all else being equal (which they're not; see next).  The original CG needed to be moved back from about 2 3/4" ahead of LE to 1 1/2", accomplished with 1 1/4 oz. of lead! With the swept wing, that figure should translate to 2 1/2" ahead of LE, pretty close.

Add to that the extended fuselage behind, with rudder located further back accordingly; subtract from that the added wing mass forward, and I'm thinking the balance should work out close to right, maybe a tad noseheavy, easily adjusted with minimal weight at the aft end.

Landing gear is actually located at the strongest part of the boom/wing combination.  The booms are only 1/16" ply, with a 1/16" ply doubler coming out of the wing to the wheel mount. Plus I want to keep as much weight as possible behind the CG.   Anyhow, canards don't take off by depressing the tail, but by lifting the nose.  I think it will be fine.

As you have no doubt guessed, I design by the "TLAR" process, and mods based on flight characteristics of prototype.  So it ain't scientific; but it's fun.
--Ray 
Roseville MN (St. Paul suburb, Arctic Circle)
AMA902472

Offline Larry Renger

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Re: swept-wing canard drawing
« Reply #3 on: September 15, 2010, 12:37:16 PM »
Rather than notching the stabilizer, why not sweep it forward too?  Or at least a straight leading edge?
Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!

Offline minnesotamodeler

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Re: swept-wing canard drawing
« Reply #4 on: September 15, 2010, 04:17:40 PM »
Rather than notching the stabilizer, why not sweep it forward too?  Or at least a straight leading edge?

Yup, that's a thought...I kinda like the swept-back LE there though, that and the wing sorta form a closure, like parentheses or something.   

I did enlarge the stab, extended it beyond the booms as suggested by you earlier IIRC.  So see I do listen...
--Ray 
Roseville MN (St. Paul suburb, Arctic Circle)
AMA902472

Offline jim gilmore

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Re: swept-wing canard drawing
« Reply #5 on: September 15, 2010, 07:41:23 PM »
ok, why have booms at all ?

You look like it has a center fuse running through the ship?

Offline minnesotamodeler

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Re: swept-wing canard drawing
« Reply #6 on: September 15, 2010, 07:52:04 PM »
Yup, profile fuselage--but, notice how far in front of the wing it extends. Very flexible at that length, Seemed to me the extra support of the booms was needed.  Besides, I needed some structure out there for a leadout guide.
--Ray 
Roseville MN (St. Paul suburb, Arctic Circle)
AMA902472


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