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Ben Wilson
Ben Wilson
01:16
"I have never experienced a longer axis making it feel faster on that axis in 3 years of frame design and prototyping."

Hope you don't mind me chiming in here, but I've noticed the opposite when flying line of sight. Stretched X frames generally look like they respond faster in pitch than roll to me.

It's entirely possible that it's just my lack of flying skill showing here. I've got an idea for a controlled experiment which I want to try out, but I won't have a chance to try it until the weekend (I need to do some programming on my radio).
 
1 hour later…
QuadMcFly
QuadMcFly
02:28
Interesting, could be I've been suffering confirmation bias for three years or my style uses sustained rotation more than small moves where the acceleration would have a larger impact on the total time spent rotating. I definitely feel higher precision on the wider axis. I guess in my head what I'm feeling is the difference between trying to rotate an object in AutoCAD with the handle close to the center of rotation vs trying to rotate it with the handle moved away from the center of rotation.
QuadMcFly
QuadMcFly
02:40
It also doesn't make sense to me that a racer would want faster rates on pitch. Philosophically you want pitch to be more stable not less stable.
QuadMcFly
QuadMcFly
03:20
I just chatted with a couple racer buddies and they confirmed my thoughts. Stretch X is definitely tamer on pitch than true X.
 
9 hours later…
QuadMcFly
QuadMcFly
12:43
Also I chatted with Mark Spatz (UAVTech) and he confirmed my thoughts.
 
1 hour later…
Ben Wilson
Ben Wilson
13:45
Fair enough, I've been thinking about how to test this and I think I've got it worked out. Nothing personal, I just have this weird need to test stuff :)

I've been playing with a LUA script for tuning to get a consistent short, sharp movement. It's not ready for use with tuning yet, but I can put identical inputs into the quad in various axis'. I'll blackbox a flight and get some hard data. With any luck, there might be some useful information in the logs.
 
2 hours later…
QuadMcFly
QuadMcFly
15:21
Awesome! Testing is exactly what we need :D My suspicion is that LOS and FPV pilots are experiencing two different aspects of this. LOS from what I've seen tends to use much more rapid, sharp movements where the faster angular acceleration will play a primary role. FPV on the hand tends to use slower more controlled movements where the angular acceleration is a smaller portion of the total time in rotation, and slower angular velocity plays a larger proportional role.

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