"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

Q-Tee Build Thread

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Old 05-10-2007, 11:34 PM
  #51  
rainedave
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Default RE: Q-Tee Build Thread

I would definitely give it some more time before making any physical mods to the carb. At best, I don't think these things will run continually at a low idle. It could very well be too lean, but I still suspect it's a problem of too much fuel building up in the engine. Does it die when you slam the throttle open or cough and spit?
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Old 05-11-2007, 06:16 AM
  #52  
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Default RE: Q-Tee Build Thread

Nope, just dies. Leaning it out a click at a time seems to extend the period it takes to quit. I had her up 3 times last night and never landed by choice, hehe. I throttled back and was attempting to make low slow passes or possibly touch-and-goes. I'll fool with it on the ground today and see what I can do.
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Old 05-11-2007, 07:08 AM
  #53  
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Default RE: Q-Tee Build Thread

I need to make a few control tweaks too, the rudder isn't quite as effective as it could be. I'm hoping adding some throw will help, but the fact that I have a bit less dihedral than the plans call for probably has something to do with it. If all else fails, I'll do some surgery on it and add ailerons.
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Old 05-11-2007, 09:10 AM
  #54  
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Default RE: Q-Tee Build Thread

In the past I've never been able to get a perfect needle setting for both full power and good idle, the needle setting has always needed to be a compromise. Any ideas why the Norvel .074 throttles so nicely? Might have to do with the perfect seal it has between the muffler and the case. A perfect seal at the carb is also helpful. I say it is time to do a thorough cleaning and take care of those details with some of the wonderful glue products that are out there. The engine mount bolts on the muffler side can always be inserted from the bottom if you have the muffler permanently attached.

Adding dihedral seems like the least invasive way to turn that plane into an aerobatic machine. They'll roll very well with just a rudder. I've suspected that the rudders were kind of puny, compared with similar sized R/E planes that I've flown. Make sure that the CG is as far back as you would like, also.
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Old 05-11-2007, 10:31 AM
  #55  
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Default RE: Q-Tee Build Thread

Check on all that, but without ailerons the dihedral makes it turn (else it'll yaw more than anything else). Just had a thought - think changing the compression might help? Don't get the wrong impression, this thing flies just fine, just needs a little enhancement.
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Old 05-11-2007, 02:05 PM
  #56  
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Default RE: Q-Tee Build Thread

Well, after much ground running, I've come to the conclusion that it was too rich. Seems Wasps don't tolerate richness very well at all. As an aside, I'm getting 17.5K+ now.
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Old 05-11-2007, 03:35 PM
  #57  
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Default RE: Q-Tee Build Thread

[sm=wink_smile.gif]
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Old 05-11-2007, 06:41 PM
  #58  
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Default RE: Q-Tee Build Thread

Have you tried the 7x3 MAS or APC? It is a great prop for that engine. I think you will find it will run longer, quieter and pull harder.....
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Old 05-11-2007, 07:10 PM
  #59  
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Default RE: Q-Tee Build Thread

Pulling hard isn't a problem, this thing's overpowered as it is

Duration isn't much of an issue either with a 2oz tank.
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Old 05-11-2007, 07:17 PM
  #60  
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Default RE: Q-Tee Build Thread

The testing I did shows that the .061 can swing the 7x3 well enough to almost match a 6x3s' thrust, but the throttle response is terrible and the engines' needle setting is too critical. All signs of an overload. Look at the load factor [Thrust HP program] between those 2 props. I consider a 6x4 too much for the long haul, too. I'm sure some guy will now come flying in with his arms waving saying that all he has ever run are 6x4s and all of his engines are 50 years old, plus he has kept a log book of each and every run since he was 9. Well, some people can smoke 2 packs a day till they reach 90, but generally speaking a 6x3 is the best all around prop, maybe for that plane a 6x2 would be even better? You will see a better low speed range with a 2 pitch, less load on the motor and better all around throttleability.The trade off would be a top speed of about 40-45 mph VS 30-35 mph.
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Old 05-11-2007, 07:29 PM
  #61  
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Default RE: Q-Tee Build Thread

cp has something there with the APC 6x2. I've been switching back and forth between that and the 5.7x3. The 6x2 is more in character with the Q-Tee. Take his advice and try one. It might even smooth out the idle a bit.
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Old 05-11-2007, 07:51 PM
  #62  
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Default RE: Q-Tee Build Thread

Maybe I'll shave one of these Graupners down to a 5.75x3 and see what happens.

hmm...according to my ruler, this Graupner 6x3 is actually slightly less than 5 7/8...betcha my main problem is a combination of NV setting not quite right and an engine not fully broken in. I probably don't have much more than 14oz through it.
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Old 05-11-2007, 08:02 PM
  #63  
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Default RE: Q-Tee Build Thread


ORIGINAL: digital_trucker
I probably don't have much more than 14oz through it.
That's hardly anything with these engines.
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Old 05-11-2007, 08:41 PM
  #64  
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Default RE: Q-Tee Build Thread

14 ozs through a AP? That's about 3 beers.
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Old 05-11-2007, 09:11 PM
  #65  
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Default RE: Q-Tee Build Thread

I could go somewhere with that break-in method but I'm not.
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Old 05-11-2007, 09:12 PM
  #66  
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Default RE: Q-Tee Build Thread

Anyone ever use one of these? I just ran across 'em via Google...(1/2A tank mounts 2/3 down page)

http://www.rcmfg.com/product_page.html
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Old 05-11-2007, 09:42 PM
  #67  
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Default RE: Q-Tee Build Thread

I wish I knew what the load # meant on the calculator. It does show at 7x3 putting out more thrust at 14,200 than a 6x3 at 17,500. It just seems like it runs better on the 7x3 to me. Just thought it would be worth it to ty it. I am going to try both props again on my plane....... 6x3 is better for speed but I'm not sure why you would need speed on the Q-Tee or instant throtle response...
I haven't been able to get mine to tun near 17.5 on a 6x3 for some reason.

How long are you flying on the 2 oz tank?

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Old 05-12-2007, 12:12 AM
  #68  
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Default RE: Q-Tee Build Thread

Chevy, I wish I knew how they arrive at it too, but if I was that smart I wouldn't have this neat job as an electrician.
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Old 05-12-2007, 06:59 PM
  #69  
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Default RE: Q-Tee Build Thread

do they still make the Q-tee and S-tee's i would like to get a S-tee
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Old 05-12-2007, 10:07 PM
  #70  
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Default RE: Q-Tee Build Thread

Here's where to get the Q-Tee. Supposedly the S-Tee and the Warlock are coming...

http://aerosphereonline.com/
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Old 05-12-2007, 11:53 PM
  #71  
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Default RE: Q-Tee Build Thread

I learned to fly on that Olympic 650, it was a kick to see a TD lug it into the stratosphere on a 1 oz run. The Q-T is the basis for great flying, easy and fast to build 1/2A combat planes. With laser cutting available now, it would be a breeze to whip some of those out.
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Old 05-13-2007, 12:07 AM
  #72  
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Default RE: Q-Tee Build Thread

ORIGINAL: combatpigg
The Q-T is the basis for great flying, easy and fast to build 1/2A combat planes. With laser cutting available now, it would be a breeze to whip some of those out.
Or, use them to race like they did thirty years ago. Can you image getting 20 guys in your club to build Q-Tees today?
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Old 05-13-2007, 12:34 AM
  #73  
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Default RE: Q-Tee Build Thread

There's your reedie racers right there, what a shot. Too bad the reedie races never took off, I thought it was a great idea. I wonder if those guys met for mass building sessions? That would speed up the process quite a bit. The guys who introduced me to RC could build Q-Ts out of sticks and scrap wood, cover them with buck a roll cellophane and fly combat inside of a 200 foot box. Back then all I could do was watch. Another game they played was follow the leader through a bunch of open net soccer goals, toilet paper roll dumps, balloon bust and limbo with crepe paper..
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Old 05-13-2007, 04:06 AM
  #74  
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Default RE: Q-Tee Build Thread

The Q-Tee is a rocket with a Wasp. It won't pull vertical, but it definitely climbs like crazy and hustles right along. There were several lekky zagys out at the field on saturday, and they didn't seem much faster although they had a lot more vertical performance. It handles 10-15 mph winds pretty well, too.
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Old 05-18-2007, 10:20 PM
  #75  
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Default RE: Q-Tee Build Thread

25 years ago our club used to build q-tee's and we installed a 2 oz tank in the nose with the battary below the tank. We also used a tee dee 049 with a 6 x 4 prop. We cut a large hole in the front bulk head and mounted the motor to an alum plate which screwed to the front bulk head. I've got some pictures of how we did it but can't figure out how to attach them here. I've been flying a q-tee for the last month. lots of fun.
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