Joined: 04 Nov 2008 Posts: 4718 Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.
Posted: Mon Dec 06, 2010 6:32 am Post subject:
Hi Trouble,
Just had to step in here. The normal tail blades act like a gyro and try to hold the blades against the servos' thrust. This makes it hard to move the tail.
The weights are designed to make the tail appear to be more like a sphere so that the gyroscopic effect is reduced, reducing the strain on the servo.
You can feel this if you run up the heli with no head and the tail servo link disconnected at the servo, then try to move the tail link. It requires some pressure. Fit the counter weights and try again and the pressure is reduced. Gives a better servo response and longer servo life, also a better controlled tail. A real win, win situation.
Joined: 12 Aug 2010 Posts: 910 Location: Galveston, Texas
Posted: Mon Dec 06, 2010 11:03 am Post subject:
Is this the Chinese weight thingie we were discussing a few weeks ago?
if not then I guess I better see about getting this done, I for sure like the idea of longer servo life and better tail control!!
(Tom, I think this requires another in-depth discussion on Skype, cuz, i still don't understand what the heck it means...lol)
"The tennis racket affect is " the centripetal twisting movement on the tail rotor blades which forces the blades to seek a 0 pitch condition " in other words when your tail rotor spins, it will try to maintain 0 pitch. When you try to increase the pitch, the force to prevent the blades from twisting will increase too. Chinese weights will counter act this force."
Joined: 12 Aug 2010 Posts: 910 Location: Galveston, Texas
Posted: Tue Dec 07, 2010 2:45 am Post subject:
OK! I got it now! Sorry, just not real smurt I guess... To reiterate what he said, That was a dramatic difference! I had done that with mine just b4 my heli tried to make a nest in that tree, so..kinda never got to see the difference, and I 4got when i re-built her. Of course, mine was homemade, a longer screw with 2 nuts on it.
thanx alot Crash and Tom!!
Joined: 01 Jan 2008 Posts: 892 Location: USA, N.J., Middlesex county
Posted: Tue Dec 07, 2010 5:56 am Post subject:
Another advantage to having the "Chinese Weights" can come into play if you are running a linear BEC built into the ESC. Most linear BEC's can barely cover the demand of 3 cyclic servos, a digital tail servo and gyro. Now if your tail servo is constantly struggling against the centrifugal force causing tail grips wanting to return to center all the time... Well that may be just too much Amp draw for the BEC to handle. The end result "could" be a radio brown out, leading to another "brown out" in the pilots shorts
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Now where did I put stª Claus' address? 
Sounds impressive though 
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