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Old Oct 29, 2004, 12:11 PM
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Joined Aug 2004
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Does shaft driven tail need mixing?

Do Cp helis such as the shogun and the hornet with shaft driven tails need tail mixing such as helis with a seperate tail motor?

I have been curious about this for a while, because as the main rotor speed increases the tail rotor speed increases proportionately.

Does this mean the tail automatically compensate for the increasing main motor torque? or if you adjust the tail rotor pitch with the tx trim will you be able to find a setting whereby the tail rotor will be compensate for the entire throttle range and keep the heli straight without mixing?

Or does the tail rotor pitch need to increase with increasing motor speed, even though its rotation speed automatically increases with increasing main motor speed. Because you would still need mixing if this was the case.

Sorry to waffle, hope someone understands what Im getting at I am thinking of getting a hornet 2 soon
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Old Oct 29, 2004, 12:20 PM
Why not Delta?
rysium's Avatar
Sacramento, CA
Joined Jun 2003
1,714 Posts
Quote:
Originally Posted by Willard
Do Cp helis such as the shogun and the hornet with shaft driven tails need tail mixing such as helis with a seperate tail motor?

I have been curious about this for a while, because as the main rotor speed increases the tail rotor speed increases proportionately.
On CP heli you want to keep the main rotor speed the same for going up and down you change the pitch of blades.

But even if you use fixed pitch on main blades and throttle will contorll the head speed, it will be impossible to set one pitch on the tail and expect to keep it from spinning at different main rotor speed. It is because the force to keep the tail is it's not linear and that's why you need to control tail separately. Unless you use HH gyro.

RysiuM
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Old Oct 29, 2004, 12:21 PM
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United States, NC, Charlotte
Joined Oct 2004
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The pitch of the tail rotor blade changes with throttle using a sevo connected to your gyro.
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Old Oct 29, 2004, 01:07 PM
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So you will need mixing as you increase the motor speed, but after that you wont because only the blade pitch changes? right?
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Old Oct 29, 2004, 01:19 PM
"It's a Quad" :O
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Joined Jul 2004
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Quote:
Originally Posted by Willard
So you will need mixing as you increase the motor speed, but after that you wont because only the blade pitch changes? right?
Nope….on a CP you get the head speed set then lock it. You change altitude via the Pitch control. As the Pitch of the main changes the torque exerted on the heli increases either clockwise or counterclockwise necessitating blade pitch changes in the tail. When you do not have an HH gyro you must mix the throttle/pitch in with the tail pitch servo.
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Old Oct 29, 2004, 03:35 PM
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Grand Forks, ND
Joined Aug 2002
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no one mentioned it, but to answer your subject of the post, how the tail is driven makes no difference if you need mixing or not. the ONLY thing that affects this is your gyro. non heading hold need mixing, heading hold do NOT need mixing (and will not work with mixing in fact...)
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Old Oct 29, 2004, 03:42 PM
"It's a Quad" :O
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Joined Jul 2004
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Quote:
Originally Posted by rkramer
no one mentioned it, but to answer your subject of the post, how the tail is driven makes no difference if you need mixing or not. the ONLY thing that affects this is your gyro. non heading hold need mixing, heading hold do NOT need mixing (and will not work with mixing in fact...)
beat ya to it.....

Quote:
Originally Posted by thewz
When you do not have an HH gyro you must mix the throttle/pitch in with the tail pitch servo.
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Old Oct 29, 2004, 03:53 PM
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Grand Forks, ND
Joined Aug 2002
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oops, should probably hit reload before posting! that is what I get for opening up a bunch of windows, going to lunch, and the replying when I get back!
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