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Old Oct 18, 2002, 11:43 PM
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jimmyray's Avatar
Oxford, Alabama USA
Joined May 2001
642 Posts
Dare Wright Flyer - Need Help

I completed my Wright Flyer today, and it tuned into a perfect evening for flying! Frsh charge on the batteries, spec'd the throws and COG, and went to the field.

Hand launch was easy, sunk a little, and proceeded to roll left. Soft landed, adjusted trim up a little and right some, tried again. Kept it airborne for a few feet, but the left roll was uncorrectable. nosed in at 45 degrees from 4 feet and caused all of the glue joints on the top wing to front struts to pop loose, as well as the canard support to top wing. Fixed it this evening easily enough (CA rocks!).

I knew ahead of time that I had a slight warp to the wing, but I was in too big of a hurry, did not think the warp was that bad, and I was foolish. (You know, you think I' learn...)

The warp can be seen below - note the right wing (picture perspective) is slightly higher at the rear than the left wing. This warp, in conjuction with the dual motors spinning identical props, induced the left roll.
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Last edited by jimmyray; Oct 18, 2002 at 11:49 PM.
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Old Oct 18, 2002, 11:46 PM
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Oxford, Alabama USA
Joined May 2001
642 Posts
The warp can be seen more readily from this side view:

I have a couple of questions:

1. How can I (easily) eliminate the warp?
2. Should I have thrust angle built in, like SkyGuy's version?
3. Where can I buy a counter rotating (reverse pitch) prop?

Thanks!

PS - Incidentally, I seldom have a warp problem with ARF's or with Bluecor - but they don't look this good, IMHO!
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Old Oct 19, 2002, 02:55 PM
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jimmyray's Avatar
Oxford, Alabama USA
Joined May 2001
642 Posts
Figured it out

One motor produced more thrust than the other - 7 oz vs 5 oz!

Fixed and will try again when no wind.
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Old Oct 19, 2002, 03:20 PM
(aka Cliff Lawson)
Wright Flyer's Avatar
United Kingdom, Essex
Joined Oct 2001
1,897 Posts
Jimmy,

Your's looks beautiful! (mine - below - is only half finished).

A lot of what I've read suggests that it is very suscpetible to prop torque and some have found it can only be turned one way. Sky Guy went for contra-rotating props that he carved himself to overcome this effect but I think some additional angle in the motor mounting might help to over come the effect a bit.

Cliff
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Old Oct 19, 2002, 03:38 PM
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Oxford, Alabama USA
Joined May 2001
642 Posts
Now if I can just get it to fly!

I think in the 4 mishaps so far, I've broken about every glue joint there was! I determined (should have known) that it is better to peel the skin where you are gluing (ie the covered wing to the braces) to get a better bond. The CA works well in the covering, but when the glue joint gives way, it seperates the sking from the wing (not good!)

Also, it has a tendency to turn left - I gotta figure out which way to angle the motors!

BTW, WrightFlyer , yours looks great too - you've got to finish it!

I spoke to Pat Tritle (the designer), and he said to prop and weight the plane to achieve the 1/2" dihedral, and then do the rigging. This will help hold the dihedral in.
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Old Oct 19, 2002, 03:43 PM
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Oxford, Alabama USA
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More pics
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Old Oct 19, 2002, 03:44 PM
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Oxford, Alabama USA
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and another
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Old Oct 19, 2002, 03:46 PM
Lookin' Good. Real Good.
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London, Canada
Joined Aug 2002
3,979 Posts
Nice

That is a nice plane. If you really wantted to elimintae your thrust angle problems, (maybe) you should have used one motor and devised a chain drive to the two props. Mongoose
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Old Oct 19, 2002, 03:47 PM
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Oxford, Alabama USA
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One More
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Old Jun 25, 2003, 09:41 AM
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Wichita, KS
Joined Jun 2003
2 Posts
rigging

could you let me in on the way you ran your rigging. I am just getting ready to start this process and could use a little experienced advise.
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