Michael_Fath
Senior Heliman
Location: Chugiak, AK
| After some field testing today, I think I discovered my bad assumption.
I was thinking that the rudder travel volume would translate directly to a specific rotational velocity. And, the gyro would take full advantage of the travel limits to give me the specified rotational velocity. Since this didn't seem to hold true, I started thinking that at both max rudder travel volumes the GY401 was simply moving the rudder servo a specific amount. I figured that I was getting uneven rates because of the reasons I'd been given here with respect to head rotation direction etc.
Originally, I had been running a servo arm about 14mm long on my 9253. The travel limiter on my 401 was about 130% (with the tail linkage just short of binding). I decided to install a very long servo arm and reduce my travel limiter. Now the "specific amount" that the gyro was moving my tail servo would result in a much higher piro rate (longer servo arm = more tail pitch for the same amount of servo rotation). Sure enough, the tail is now a ripper with the longer servo arm. I used that ginormous Futaba servo wheel (at about 19mm). My travel limiter is just below 100%. I did have to reduce my gain from the low 90s to the upper 70s. But, the tail of my heli is now a blur. I did full speed backwards flight and had no blowouts. If the L/R piro rate is uneven now, I would have no way of knowing. It's just friggin fast in both directions. In an effort to solve my uneven piro rate issue, I stumbled on to a solution of my anemic tail with the 401. It was a good day. Heck, nobody's probably reading this anymore anyway.
Mike |
