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XHELI.COM . Autography FlightPower . Advantage Hobby

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Radio - Servo - Gyro - Gov - Batt > Futaba 7C, 9Cs and CCPM
 
 
GimbalFan
Elite Veteran
Location: Copter County, Nv

Good point.

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t
03-31-2006 Over year old.
 
 
fromme2u
Veteran
Location: Jacksonville, FL

Ok, well I looked at the paddles when I just did the test again. No problems. No deviation, no lag, nothing. You also have to take into consideration the phase of the washout to the rotorhead. if your phase is off, then your paddles will move also.

Chad

Naval Aviation...College Degree to Break 'em...
High School Diploma to Fix 'em
03-31-2006 Over year old.
HOMEPAGE  
 
 
GimbalFan
Elite Veteran
Location: Copter County, Nv

This is puzzling to me, but since I don't yet have an eCCPM bird to experiment with I'll also talk with the guys up in Utah this weekend at the FF.

Thanks again, Chad.

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t
03-31-2006 Over year old.
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

Gentlemen,
All I can say is that my measurements are real and repeatable. I would have to guess that the reason Futaba implemented the rate limiter on the 9CS and 7C is to help keep the swash level.

The latency in a 9C, 9CS, and 7C is clearly visible and feelable when you compare them to faster radios on the same helicopter with the same servos. Once you see and feel the immediate response of a Stylus or 14MZ, you will then realize what latency feels and looks like. eCCPM trueness is also much more noticeable when doing direct comparisons.

If all you have ever flown is a "slower" radio, then you will be quite accustomed to it and it will feel fine and dandy to you. It should be quite obvious that our radios really aren't the limiting factor in what can be done with any given helicopter. Just like putting one of Joe Satriani's guitars in my hands won't make me play or sound like Joe, putting a 14MZ in my hands won't make me fly like Jason Krause.

Now, what I have read here and been told straight from some flying buddies who went to the 14MZ is that they immediately felt more confidence in the heli and how it would react and thus started doing maneuvers a bit lower in altitude. The reduction in latency was probably the contributing factor.

Think of it this way... We have one big control loop going on: eyes, brain, hands, radio, heli. The faster you can make that control loop, the better. Any latency added by the radio causes more disconnect between the pilot and the heli.

The ultimate goal is having fun. Whatever radio allows you to have fun is just fine.

- John

MSH Protos
04-01-2006 Over year old.
 
 
GimbalFan
Elite Veteran
Location: Copter County, Nv

Quote 
Futaba implemented the rate limiter on the 9CS and 7C to help keep the swash level. -- John


This is one of the puzzle pieces I was missing -- to match servo travel speeds as a result of or to compensate for slow processing in the tx's CPU. Why this was designed into those several other brands when ATX's Stylus had been showing it could work better for 10+ years is the mystery I now ponder.

I made some observations and asked some questions in St George at the April Fools FF (several April 'fools' showed their stuff on the 1st -- you know who you are!), and I understand latency well enough now to plan ahead.

Thanks for responding, John. Thanks all for the other answers too.

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t
04-03-2006 Over year old.
 
 
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Radio - Servo - Gyro - Gov - Batt > Futaba 7C, 9Cs and CCPM
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