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Old Feb 27, 2014, 08:16 PM
a little kid at heart
poulsbobill's Avatar
Poulsbo, Wa
Joined Sep 2004
1,226 Posts
Wing Rock

I have a bad case of wing rock. Worse on high alpha but its there even during level flight to some degree.

I also get a tip stall on sharp turns. I know this is inevitable but its really bad.

Any ideas?

Cg is at the rec location. Ive tried further back but doesnt seem to help'

Thanks

Bill
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Old Feb 27, 2014, 08:47 PM
TEAM TWISTED
ROLLING CIRCLE's Avatar
United States, MD, Middle River
Joined Dec 2011
990 Posts
Quote:
Originally Posted by poulsbobill View Post
I have a bad case of wing rock. Worse on high alpha but its there even during level flight to some degree.

I also get a tip stall on sharp turns. I know this is inevitable but its really bad.

Any ideas?

Cg is at the rec location. Ive tried further back but doesnt seem to help'

Thanks

Bill
What's your power setup? Tip stall will happen if airspeed is too slow to fly the plane (as you probably know). An aggressive turn with too little airspeed will stall the plane and cause the dive. For the wing rock, move the CG forward. It should feel more solid further forward. Planes are more maneuverable with CG aft and tend to torque roll better but for just normal aerobatic turns, you should be good a little forward. The recommended CG is a guide and generally for the TH Power combo incl. the servos... FWIW...
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Old Feb 27, 2014, 10:17 PM
Can't get enough
jabsten's Avatar
United States, WA, Puyallup
Joined May 2010
2,274 Posts
What props are you guys using? Just curious


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Old Feb 27, 2014, 10:28 PM
wrecklessly misspeling stuff..
tuck's Avatar
United States, CA, Citrus Heights
Joined Feb 2009
970 Posts
7x3.5 gws dd or 6x3 gws direct drive. The smaller of the two seems to make all the surfaces more effective.
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Old Feb 28, 2014, 01:03 AM
Can't get enough
jabsten's Avatar
United States, WA, Puyallup
Joined May 2010
2,274 Posts
I'm using 7x3.5 power combo... haven't tried the other. On the crack mini I use the same prop and love the way it flys.


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Old Feb 28, 2014, 01:41 PM
Twisted Do Nut!
KamikazePilot's Avatar
Fort Worth
Joined Dec 2010
2,347 Posts
The CPM has always had the 7x3.5 on the CYM I started out with a 6x3 but went to the 7 not long afterwards.
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Old Feb 28, 2014, 02:49 PM
Can't get enough
jabsten's Avatar
United States, WA, Puyallup
Joined May 2010
2,274 Posts
Tried the lower prop last night and was disappointed. Back to the 7x3.5.


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Old Feb 28, 2014, 03:37 PM
a little kid at heart
poulsbobill's Avatar
Poulsbo, Wa
Joined Sep 2004
1,226 Posts
Quote:
Originally Posted by ROLLING CIRCLE View Post
What's your power setup? Tip stall will happen if airspeed is too slow to fly the plane (as you probably know). An aggressive turn with too little airspeed will stall the plane and cause the dive. For the wing rock, move the CG forward. It should feel more solid further forward. Planes are more maneuverable with CG aft and tend to torque roll better but for just normal aerobatic turns, you should be good a little forward. The recommended CG is a guide and generally for the TH Power combo incl. the servos... FWIW...
Have the stock power setup. Will try the fore cg setting and see what happens.

Thanks

Bill
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Old Feb 28, 2014, 09:16 PM
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ROLLING CIRCLE's Avatar
United States, MD, Middle River
Joined Dec 2011
990 Posts
Also, for grins, hold your plane and go to WOT fast as she will go and make sure your power is steady full on for a minute or so. Just to check if your ESC and battery are all good. If you feel surge and fall in the output, could be weak packs causing air to slow down on the surface. In general, this plane likes to go fast IMHO.
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Old Apr 04, 2014, 06:38 AM
Registered User
Poland, Masovian Voivodeship, Warsaw
Joined Mar 2006
124 Posts
Small tip for battery mounting in cut slot. The slot becomes loose in time, so you can reinforce it with tape and to avoid slipping off the battery (very funny flying...) the technique of dry Welders or Uhu Por helps a lot. Personally I used "flussig gummi" from Conrad and it works very well...
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Old Apr 04, 2014, 08:50 AM
Romans 8:34-39
bhoov128's Avatar
United States, FL, Davenport
Joined May 2012
8,475 Posts
If the wing rock happens during level flight look for surface slop too - torn hinge, slop in the rods, or a loose aileron servo
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Old Jun 17, 2014, 03:11 PM
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jcansdale's Avatar
United Kingdom, Gunnerton
Joined Dec 2010
1,095 Posts
What motor do people prefer on this plane?

I have a T-Motor AT2202/2300kv and 7" prop on my Crack Yak Superlite that I'm not so happy with. I'm thinking about swapping it for a 1500kv motor with a 8" prop. Would the AT2202 work better on the Mini Pitts?
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Old Jun 17, 2014, 08:23 PM
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United States, MD, Middle River
Joined Dec 2011
990 Posts
Yup, the 2202/2300 is THE motor for the CPM.
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