Y6 Yaw imbalance

The last Bastion to fine tune your FC matching your airframe & setup

Re: Y6 Yaw imbalance

Postby Max » Wed May 08, 2013 2:33 am

So you never tried using all the same style prop? All E or all SF. I've gone back and looked through some of the stuff I read earlier about using different size/pitch props top/bottom, and I found several setups that people liked, none of which used different style props. Not saying it wasn't worth a try... :)

Also, when you leveled your motors, did you level _both_ motors on each arm? With the round tubes and clamps, if the clamps aren't tightened evenly, the motor plates also won't be parallel. It was a bloody hassle getting both motors to be parallel and even... 3 times! And of course one set got knocked out of alignment when I dorked the prop... :roll:

I did a quick test earlier this evening with 11x5 top props, all CW, and 11x7 bottoms, all CCW ("old" mix). I picked up some new vibrations from switching props (balanced, yes), so it was just a quick flight before dinner. The yaw is very balanced though, as are the motor outputs. Log graphs look basically like 2nd flight, above. Not sure if the vibes are from a bad prop, or if the combo of different pitches causes the extra vibrations (which I see in the X & Y accels, not in the Z).

I will try a 12x6 top and 11x7 bottom next, after I find the vibe source. Besides looking for yaw imbalance and checking motor temps, I'm not really sure how to quantify these prop tests.

-Max
Max
 
Posts: 2814
Joined: Mon Aug 13, 2012 9:45 pm
Location: Near Ithaca, NY, USA

Re: Y6 Yaw imbalance

Postby LPR » Wed May 08, 2013 5:06 am

Max

The best way to see if your loading all the motors the same is to use a watt meter on each motor while your hovering. I did not say it was an easy way. Motor temps on the bottom motor will be off because of the cooling from the top props.

Larry
LPR
 
Posts: 1323
Joined: Tue Jun 26, 2012 1:29 pm
Location: MN, USA

Re: Y6 Yaw imbalance

Postby SuperSharpShooter » Wed May 08, 2013 5:42 am

Max wrote:So you never tried using all the same style prop? All E or all SF. I've gone back and looked through some of the stuff I read earlier about using different size/pitch props top/bottom, and I found several setups that people liked, none of which used different style props. Not saying it wasn't worth a try... :)

Also, when you leveled your motors, did you level _both_ motors on each arm? With the round tubes and clamps, if the clamps aren't tightened evenly, the motor plates also won't be parallel. It was a bloody hassle getting both motors to be parallel and even... 3 times! And of course one set got knocked out of alignment when I dorked the prop... :roll:

I did a quick test earlier this evening with 11x5 top props, all CW, and 11x7 bottoms, all CCW ("old" mix). I picked up some new vibrations from switching props (balanced, yes), so it was just a quick flight before dinner. The yaw is very balanced though, as are the motor outputs. Log graphs look basically like 2nd flight, above. Not sure if the vibes are from a bad prop, or if the combo of different pitches causes the extra vibrations (which I see in the X & Y accels, not in the Z).

I will try a 12x6 top and 11x7 bottom next, after I find the vibe source. Besides looking for yaw imbalance and checking motor temps, I'm not really sure how to quantify these prop tests.

-Max

No, I never tried using all the same style prop. I didn't have 12" APC SF props in a pitch other than the 3.8, or the 12" E's in anything but 6. I've been pretty careful to make sure both the top and bottom motors were both clamped evenly.

I am just about ready to throw this thing out the window though. I just bolted my gimbal on, and now it's started to randomly flip on takeoff again. Grr!

Edit: turns out one of my dome bolts was in the wrong position, and I guess on takeoff the dome vibrated against the frame causing it to freak out... Secured the dome properly, and it's flying well again. phew.
-Glenn
SuperSharpShooter
 
Posts: 276
Joined: Sat Jan 12, 2013 9:44 pm

Previous

Return to PID Tuning

Who is online

Users browsing this forum: No registered users and 2 guests

cron