Toronto Electric Model Aviation Club Forum

Toronto Electric Model Aviation Club (TEMAC) => Building / Construction => Topic started by: Wingnutz on May 02, 2013, 10:23:53 AM

Title: Mixing digital and analog servos?
Post by: Wingnutz on May 02, 2013, 10:23:53 AM
"Can I mix digital and analog servos on the same model?"
Shopping for HK servos for an ARF I'm assembling and need high torque low profiles for the ailerons and strong standards for the rudder and elevator.
Low profiles I can only afford in analog but the standard digitals are reasonably priced. Advice appreciated.
Title: Re: Mixing digital and analog servos?
Post by: Ededge2002 on May 02, 2013, 11:03:42 AM
Yes you can mix analog and digital servos PROVIDED you are not using a dedicated "high speed mode" that is available with some transmitter/receiver systems.  The high speed mode will overheat and damage the analog servos.
Title: Re: Mixing digital and analog servos?
Post by: Andy Hoffer on May 02, 2013, 11:42:50 AM
Quote from: Ededge2002 on May 02, 2013, 11:03:42 AM
Yes you can mix analog and digital servos PROVIDED you are not using a dedicated "high speed mode" that is available with some transmitter/receiver systems.  The high speed mode will overheat and damage the analog servos.

Hmm!  Does that make them puff?!!  :)

Andy
Title: Re: Mixing digital and analog servos?
Post by: Ededge2002 on May 02, 2013, 11:59:33 AM
Puff of smoke quite possibly but it would be up to the NTSB to identify that was the cause of the crash...
Title: Re: Mixing digital and analog servos?
Post by: Bobmic on May 02, 2013, 01:55:25 PM
I thought you need a high speed receiver in addition to the Transmitter in order to get the frame rate to 11ms (or in your case 7ms).
I wouldn't think the speed will be much of an issue unless the servos are really slow or sloppy.
For sure, using a regular servo on a high rate system will eventually burn them but the problem is usually with Gyro's that run in the range of 250-300Hz which is 3ms and is constantly correcting the servo.

As for mixing up servos.... as far as I know the DX8 has a higher frame rate speed but I doubt you are using the high speed receiver and I don't think there will be any issue, in any case if there is a problem the servo will start to jitter.
Title: Re: Mixing digital and analog servos?
Post by: Wingnutz on May 02, 2013, 06:41:21 PM
I'll probably use an Orange receiver and satellite with a DX8 transmitter. I haven't played with frame rates so after reading the preceding posts I think the answer is yes.???
Title: Re: Mixing digital and analog servos?
Post by: Ededge2002 on May 02, 2013, 06:48:31 PM
Yes the answer is a resounding yes.