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Superfly problem

Old 11-07-2007, 04:44 PM
  #1  
MARKZR7
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Default Superfly problem

I just built a new SF. Added a new 3-c 20c 1300mah
This thing went crazy up down stalling Just barley
got back on the ground. bm 24 motor. Seems like lots of power
How far from the nose should the battery be or is it just to big???
I think my motor may have been off center a bit. fixed that
Any help would be great
Thanks mark
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Old 11-07-2007, 04:54 PM
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pburt1975
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sounds like the COG needs to move more towards the nose of the plane. should help to level it out in flight. Or the battery is to large and making your COG impossible to locate properly
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Old 11-07-2007, 05:19 PM
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MARKZR7
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not sure but others have said they use 3-cell 20c 1300
weight is 112 grams I went home so I didn't have a chance to
move the lipoly forward. I want to be sure on the problem. I just got
lucky getting it down without crash
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Old 11-07-2007, 08:08 PM
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pburt1975
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According to the build instructions, the COG should be 9.25"-9.75" from the tip of the nose on the underside of the plane.

http://www.superflyrc.com/pdf/SuperFly.pdf

According to the site your battery is fine
2-3 cell 1200-1500 LiPoly
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Old 11-07-2007, 08:19 PM
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Schlepp
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I fly my Superfly with anywhere from a 2s 1000 up to a 1700 3s and have the battery in the same spot regardless of its weight, the CG isn't real critical with this design, but I've been flying this thing for 2 years now so I'm pretty used to it.
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Old 11-07-2007, 08:56 PM
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MARKZR7
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I also have small micro servo's
about the size of hs55 what the heck is
going on
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Old 11-08-2007, 12:15 AM
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lmopar69
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How experienced of a flyer are you Mark? Could you just be over controlling it? What do you have your throws set at? The SF can be pretty sensative on the sticks.

Laine.
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Old 11-08-2007, 12:24 AM
  #8  
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This is my 3rd superfly
over 3-years I never had one do this
I also never had one with this much power
On scale of 1-10 I'm a 4
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Old 11-08-2007, 01:15 AM
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lmopar69
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Hmmmm. That is odd then. And its only acting up in the "pitch" axis?
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Old 11-08-2007, 01:37 AM
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Major Danger
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Is this the first time you've used the micro servos Mark?
yes those 1300 3S lipos make this plane pretty potent compared to the 2 cells huh.

But from what you've discribed so far, it sounds like your servos cannot handle the large ailerons and the thrust from this motor. This is my assumption based on not knowing if this is the first time you've used these particular servos.

Drop the brand name and model number of the servos if you can. This may bear looking into.

By the way Mark WELCOME TO WATTFLYER !!!!
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Old 11-08-2007, 01:46 AM
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Yes it is the first time
I've given full power & they seem fine on the ground
They are from united hobby 8g servo
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Old 11-08-2007, 02:04 AM
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lmopar69
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What does it do power off in the air? Did you get to glide it at all?
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Old 11-08-2007, 02:07 AM
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Major Danger
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Ok Mark I think maybe we found a suspect on the potential problem. While they test out fine on the ground WOT, it's still not a full load on the ailerons. I think I'll make some time to browse around UH and see if I can find some torque data on their 8gram servos.

In the mean time Laines question is most important to assist identifying our suspects.

" What does it do power off in the air? Did you get to glide it at all? "
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Old 11-08-2007, 02:24 AM
  #14  
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Also major
The superfly did almost the same flying
at slow speed( no control)
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Old 11-08-2007, 02:25 AM
  #15  
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very little even at slow speed
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Old 11-08-2007, 02:27 AM
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lmopar69
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well, that is strange. Where did you have it balanced at?
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