TH2 questions. Please help

[tungym]

THANKS, grasshopper. I resolved my 401 problem as I used another HH gyro without gain wire. I am referring to the DCP yaw compensation. I wonder if the mixing be better through the Tx by elev--rud mixing, or through the TH2 Yaw compensation.

It is raining in Hong Kong and I have no chance to test flight.

[v22chap]

tungym ,, according to Joe ..you can do it either way and it will work ..and I am sure that if it worked better through Joes Th-2 he would tell you to use it instead of the TX ... I use the TX because it is simpler to get to and change settings as needed .:thumbup:

[Gra55h0pper]

I wonder if the mixing be better through the Tx by elev--rud mixing, or through the TH2 Yaw compensation.

Yes, I have been wondering the same thing. The main difference between the two is of course that when mixing in the transmitter it's before gyro stabilization whereas in the TH-2 it's after gyro stabilization.
My theory: The TH2 can "see" the corrections applied by the DCP gyro. These corrections induce some yaw. It would therefore be best to apply the mix in the TH2. I'm not sure whether it really makes much of a difference though.

In my case, I also have an infrared (Spartan-RC) stabilizer, which -when activated- essentially takes over control from the pilot (to a certain extend). As I cannot mix elevator to rudder in the stabilizer and as I do want the DCP inputs applied by the stabilizer also to be yaw compansated, I'm applying the mix through the TH2.

[tungym]

Yes, I have been wondering the same thing. The main difference between the two is of course that when mixing in the transmitter it's before gyro stabilization whereas in the TH-2 it's after gyro stabilization.
My theory: The TH2 can "see" the corrections applied by the DCP gyro. These corrections induce some yaw. It would therefore be best to apply the mix in the TH2. I'm not sure whether it really makes much of a difference though.

In my case, I also have an infrared (Spartan-RC) stabilizer, which -when activated- essentially takes over control from the pilot (to a certain extend). As I cannot mix elevator to rudder in the stabilizer and as I do want the DCP inputs applied by the stabilizer also to be yaw compansated, I'm applying the mix through the TH2.

Thanks grasshopper.

I already trim the ELEV->CH5 mixing to an optimal of ..say from 70% to 85%, DCP input from CH5 and with TH2 DCP gain around 30% (as recommended) .

Since I want to spare the CH5 for something else, can I set DCP input from ELEV , rather than from the CH5. So how much should I adjust the DCP gain to have the same feel as my previous setting. What fraction should I add on the TH2 DCP gain (30% x 115% = 34% or 30%+15%=45%)? As far as I know, CH5 is meant to remote change the DCP gain , right. But is the relation to mixing a multiplication or addition?

[joe@tech-mp]

tungym,

First off, I don't recommend this setup because DCP will no longer be alone through the gyro. It will have elevator cyclic too which dosen't work well with the gyro in HH mode.

Anyway, to determine the right amount of gain simply measure the amount of DCP travel in your current setup. Do this by first setting the elevator input gain to zero (in the TH-2) to allow you to see just the DCP.
Temporarily set the DCP gyro mode to "rate mode". Now measure the travel (swashplate). It should be around 5mm or less peak to peak (low stick to high stick).

For your new setup, just adjust the DCP gain (in the TH-2) for the same amount of travel.


Joe

www.techmodelproducts.com