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Old May 13, 2015, 07:25 PM
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United States, AL, Randolph
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I built one back when the plan was published. As the Op said it had a terrible time with taking off, wanted to ground loop something awful. All the settings were right on and without the wings it was perfect. Flew great from a hand launch, it just wouldn't get off the ground. It was my first sucessfull Biplane, sorta.
I would not recommend Lite ply sides, Way too heavy for a 09 -.15 airplane. I think the magazine article says something about balsa or lite ply being acceptable.
Larry
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Old May 14, 2015, 12:06 PM
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My laser cut Q tee short kit arrived today up here in Canada From the gentleman on this thread. He still may have one left and they are good value in today's world.

Turned out I shorted him 1.00 on his estimated additional mailing cost to Canada. Still for twenty eight dollars delivered to any American included postage a good deal as well.

He also may have a few other .049 type short kits available. Worth contacting him perhaps? I thought his .049 skylark versions might prove interesting as well to some.

I am also trying to get my hands on one of the older 54 inch comet model kits at this time as well. To build a lightweight electric version. The way things are going I may just get a set of plans from an old kit and scratch build it.
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Old May 15, 2015, 11:14 AM
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Thanks for the kind words Barry. Glad you received it in good shape. Hope you enjoy it.

John
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Old May 24, 2015, 12:27 PM
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South Africa, GP, Johannesburg
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Plastic Q-tee?

Not quite sure what made me pull my old Q-tee out of the cupboard today and ponder what it would look like if I rebuilt it in correx.

For those not familiar with correx it has a less than enthusiastic reputation amongst many builders. However, if one can get hold of the lighter 2mm variety, it has numerous good points in its favour:
  • Weight similar or lower than balsa and film covering
  • Much tougher than depron or equivalent weight in balsa
  • Very quick and simple building - most edges can be folded rather than cut and glued
  • Nice surface finish that can be left white or painted - no sanding needed.
  • Suitable for both electric or glow power - light enough for electric, and strong enough for glow. Not to mention fuel proof (though I suspect the paint won't be fuel proof, so packing tape or vinyl trim would be a better option for a glow model)

It's very cheap as well - about USD4 for a 1.2m x 2.4m sheet.

On the downside, a 2mm correx wing tends to be heavier than a balsa and film wing (but about the same weight as a sheeted balsa wing). But I've got several old Q-Tee wings lying about, so I can just use one of those

Anyway, it looks like I can bring the AUW down from an admittedly heavy ~560g to a target 370g by using my original wing and building a new fuselage and tail feathers from 2mm correx. I've had to make some changes to get the CG right with the intended power plant (a little Blue Wonder with 800mAh 2S lipo) and to keep the construction simple. I've shortened the rear fuselage by 25mm, extended the nose slightly and moved the firewall forward to get the balance right. Then I have turned the curves on the fuselage into straight lines to allow me to fold the entire fuselage from a single sheet of correx. I could have kept the curves, but this would have made the construction slightly harder.

I've been playing with these modifications in Sketchup, and this is what I plan to do.
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Old May 26, 2015, 08:55 AM
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Well, that did not take very long...

It took just an afternoon and two evenings to build and maiden my resurrected Q-tee with its new correx fuselage. At 340g it not only came in nicely ahead of target, but is just over half the weight of what I estimate my original 051 powered version to have been (OK, it was heavy...but I guess that is what years of repairs and castor oil does). Paint will add at most another 10g.

As you can imagine, at this weight, it's quite a different plane. But now I have some idea of how a properly built Q-tee is supposed to fly! My old one had a CWL the same as my war birds, so no wonder it never quite felt like a trainer.

The correx fuselage has far more strength than is needed for this electric version - would definitely be an option for a glow rebuild.

Here are some pictures.
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Old May 26, 2015, 09:53 AM
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Did you use the 2mm for the tail? Looks nice with the balsa wing, maybe a fold up wing for the SPAD purists at a bit of a weight disadvantage.
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Old May 26, 2015, 10:48 AM
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You sabotaged my plane.
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Looks good.
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Old May 26, 2015, 11:20 AM
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Yes, the tail is all 2mm correx.

I guess one could do a full correx wing. It would be simple enough and should only add another 30g - 40g to the AUW if a CF spar was used. But I suspect that there are a lot of old Q-Tee wings out there in perfectly good shape - it was usually only the fuselage that got crunched in any 'landing mishap'. And as you said, the balsa and film wing just looks really nice.
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Old May 26, 2015, 11:22 AM
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Does look good. Although the coffeee stir stix ...do give pause.
Even spruce substitutes/upgrades in the Kit version tend to snap.. easily.
Carbon tube struts might be an eventual solution
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Old May 26, 2015, 12:25 PM
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Quote:
Originally Posted by Bare View Post
Does look good. Although the coffeee stir stix ...do give pause.
Even spruce substitutes/upgrades in the Kit version tend to snap.. easily.
Carbon tube struts might be an eventual solution
Had the same thought! But the way I've 'overlocked' them should add a lot of strength. I think the wood is strong enough for any expected flight loads, but I was worried about the small joint area with the uprights - especially as the rubber bands tend to 'twist' the sticks and put a load on the joint.

The attached picture should give you a rough idea of what I did - should be OK for the type of flying I have in mind.
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Old May 28, 2015, 10:01 AM
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I've added a quick coat of paint. Just kept the same silver-red-black of my original. I'm pretty pleased with the way it has turned out. It's a totally different plane to fly now.

For interest, here are two nice variations on the LG and access hatch that I could add using correx - I'll explain on each picture.
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Last edited by Extreme Sports; May 28, 2015 at 10:22 AM.
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Old May 28, 2015, 11:35 AM
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Original Airtronics Q-Tee kit used 1/4"x1/8" (6mmx3mm) spruce for the cabine strut system, which was sufficiently strong even for rigorous 1/2-A acrobatics. Always inspect before each flight. Regarding coffee stirrer sticks, I think if you double them up to double their thickness ought to be sufficient. Use a stronger and more flexible glue like Epoxy instead of CA for the cabine struts.

And BTW, I like your improvising materials with Correx, this is a good application for fuselage.
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Old Jun 11, 2015, 02:41 AM
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Aspeed's suggestion got me thinking about a correx wing for the Q-tee. I decided to try a single skin 'curved plate' wing rather than the more conventional and heavier 'folded' type. Took all of an hour to build and weighs just under 90g, so it's marginally lighter than the original wing.

'Curved plate' wings are high lift but very high drag, so I was not expecting too much from this experiment, but I was pleasantly surprised. The high drag seems to suit the Q-tee well as it slows the plane down (good for a trainer), while the high lift enables very short (~1m) take offs.

The wing has no spar, but I added a length of string as a 'rigging wire' that provides strength and keeps the wing from twisting under load. As you can see in the video, it's more than strong enough for loops and snap rolls, which are about the most violent manoeuvres that I could think of. In the air, the wires definitely add to the 'cuteness' factor. I will probably replace them with detachable struts in the near future.

QTee in correx 2 (2 min 24 sec)
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