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Old Dec 05, 2015, 11:23 PM
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Hi Guys!!!! i´m thinking to start a new Q-Tee, as the last one get sold 2 years ago
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Old Dec 06, 2015, 01:52 PM
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Cool old bird. Airtronics had some really fine kits.
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Old Feb 12, 2016, 01:07 PM
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Hey guys, can anyone help me? I have built a q tee recently and im trying to fly it, but its a bit weak on power, I have to use full throttle just to get cruising speed.. So it doesnt climb easily.. Im using a emax 2822 motor that have 1200 kv, a 8x4 gws prop, 30A esc and 1300 mah 3s battery. What could I change to have more power and get to cruising speed with about 50% throttle? The total weight of the plane with battery is 580 g. Tks for your help
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Old Feb 12, 2016, 01:44 PM
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Have you put a watt meter on it yet..That motor may not make the power you want.you will need closer to 200 watts if you want to use less throttle.
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Old Feb 12, 2016, 02:04 PM
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I havent, I dont have the watt measurer.. What motor do I need then? I have a 1500 kv emax 2812, but its for 5-7" prop, would it be stronger or weaker? I dont get the relation between torque and speed, not in the practical way
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Old Feb 12, 2016, 09:24 PM
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Fit a 7 x 6 prop :-)
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Old Feb 12, 2016, 10:34 PM
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Whats the difference between a 1200 kv with a 8x4 and a 1500 kv with 7x6?
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Old Feb 13, 2016, 12:05 AM
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KV is the RPM per volt that the motor will turn. Go to a higher KV for more RPM. If the amp draw is too high you can go to a smaller dia prop to lower amp load
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Old Feb 13, 2016, 05:58 AM
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I have the exact same motor and lipo on my old, heavy Q-tee. However, 580g is even heavier than mine - is there any way to lighten yours a bit?

That said, the Emax should be more than enough - the original glow motor put out around 80W, so the ~150W of the Emax should be more than enough.

Suggest you try an 8x6...I've found that to be the best prop for the 2822, and the extra tip speed seems to make the difference with a heavy Q-tee, since it needs to fly faster than a light one. The motor can handle a 9x3.8 prop, but I doubt it will help - yes, you will get more thrust, but less tip speed and my experience is that the speed is what you want.

If that does not work, consider building a much lighter fuselage and using a lighter power system. I built a correx fuselage with 24g Blue Wonder motor and 800mAh 2S lipo, which dropped the AUW to under 350g - totally different plane. I needed to extend the nose to get the CG right - see: http://www.rcgroups.com/forums/showp...4&postcount=21

PS: I've found that although the 1500KV version of the motor recommends a 7x6 prop, I can get away with an 8x4, which makes a big difference to the power - so while a 7x6 will give you the required tip speed, it will hardly stress your 1200KV version, hence my suggestion for the 8x6. This should not draw more than 18A, so the motor will be fine as long as you are careful with the throttle. I guess you could also try the 2812 (1500KV) motor with the 8x4 prop - that will be more than enough thrust and pitch speed.
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Old Feb 13, 2016, 10:55 AM
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Tks for the response, it was really clarifying. Now the thing is, I dont have a 8x6 prop right now and it is hard to find nearby. I do have though a gws 9x5, a gws 8x4, a ep 7x6 and a ep 7x5. And the two motors emax 2822 and 2812, 1200 and 1534 kv. Só in this case, What you think would be the Best combination of those tô get this baby flying smooth with 50% throttle? Tks
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Old Feb 13, 2016, 11:46 AM
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Quote:
Originally Posted by slug182 View Post
Tks for the response, it was really clarifying. Now the thing is, I dont have a 8x6 prop right now and it is hard to find nearby. I do have though a gws 9x5, a gws 8x4, a ep 7x6 and a ep 7x5. And the two motors emax 2822 and 2812, 1200 and 1534 kv. Só in this case, What you think would be the Best combination of those tô get this baby flying smooth with 50% throttle? Tks
Slug182, love your choice of finish and colors on the Q-Tee, looks so ominous and bat-like, really original. Can't help much with the prop sizes on electrics. The others are right about matching the prop to power curve. An an analogy from nito, at 6,500 ft high elevation I found a Black Widow .049 barely pulled Q-Tee on a 5.25x4 nylon prop, but flew decent with a 6x3 prop. At sea level, both produced about the same thrust.

Put a 7x3 APC on an Enya .09-III TV on a 40" span cabin foamie, flew very .049 reedie like, but with a 7x6 APC moved out with authority. (Older cross scavenge engines of the 1950's and 1960's HP peaked at a lower RPM than modern Schneurle ported engines, i.e., 12k RPM versus 15-17k RPM)

Nice thing about electrics is you can try a prop, doesn't work well, bring 'er in and easily change. Somewhere you'll find the right combo. I'm sure you'll get is sorted out.

BTW, like your full house setup of Q-Tee with ailerons and dihedral reduced to make them more effective.
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Old Feb 13, 2016, 11:52 AM
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The 2812 (1530KV) with the 8x4, the 7x6 or the 7x5 should all work fine. Should give you at least 700g thrust with more than enough tip speed. I'd start with the 8x4 but check the motor temp every few minutes until you are happy it is not overheating.

If these don't work then the only other problem I can think of is your lipo not giving enough current.

EDIT: that 8x4 looks as if one tip is damaged. Is it not perhaps out of balance? If so, that would also explain the lack of power.
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Old Feb 13, 2016, 03:53 PM
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590 gm /20 oz Ain't light.
But Not overly heavy either.... given the things typically flew at ~24 oz with an anemic .049 when New.
Dunno what the ailerons are for though.
Fit the various props you have ?... and see/learn for yourself
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Old Feb 13, 2016, 05:03 PM
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Ok extreme sports, I Will try that! Tks so much for your help
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Old Feb 13, 2016, 09:47 PM
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590 gm /20 oz Ain't light. But Not overly heavy either.... given the things typically flew at ~24 oz with an anemic .049 when New. Dunno what the ailerons are for though. Fit the various props you have ?... and see/learn for yourself
Lee Renault designed the Q-Tee to handle the weight of a standard 4 AA sized nicad battery pack and standard servos back then. It has very ample wing area, the Q-Tee flies on its wing. It is one of the few .049 reedy aircraft that can be flown at high elevations because of its wing area. It can do decent 2 channel aerobatics because of its ample elevator and rudder. When I had an .049 reedie on it, one would have to enter a dive to build up speed to loop and do manoeuvres, but it could do it.

Lightweight electrics have really opened up its flight envelope to do more due to the greater thrust over the old nitro reedies.
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