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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › GY 240 question?
03-04-2008 08:26 PM  10 years agoPost 1
J_Cunny

rrVeteran

Austin, Texas

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Are these for digital servos only? Would a JR185 (non digital) work with it?

JC

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03-04-2008 09:03 PM  10 years agoPost 2
SteveH

rrProfessor

Texas

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See below.

The government cannot give you anything without first taking it from someone else.

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03-04-2008 09:04 PM  10 years agoPost 3
SteveH

rrProfessor

Texas

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They do not require a digital servo, but like any gyro, the faster the servo, the better.

The government cannot give you anything without first taking it from someone else.

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03-05-2008 02:57 AM  10 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

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The GY240 does NOT support the high update frame rate of the high speed digital tail rotor servos. It will drive digital servos fine, but you won't gain the benefits of using a high speed digital servo using the 240.

You'll need at least something on the order of the GY401 to take advantage of high performance digitals.

The servo you mention will work with the 240, no problem. It's quite similar in specification to the Hitec HS-50 and the JR Sport SM-8. I have a couple of older model Trex 450s (a 450X and a450X-V2) using the GY240 with both the SM-8 and HS-50 on the tail. The gyro and servo combo works fairly well on the small Rex.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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03-05-2008 03:53 AM  10 years agoPost 5
rexxigpilot

rrProfessor

Florida

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Indeed, the GY240 works fine with non digital servos, I used one on my first T-Rex450, an XL version, along with a Hitec 56 servo. The gyro has no limit stop, so you have to get the linkage setup right.

May have to pull my old manual (if I can find it) on the digital servo types. I was of the understanding that it will work fine with digital servos up to a 9254, same as the 401. It just can't handle narrow pulse (760 usec). I could be wrong.

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03-05-2008 05:19 AM  10 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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The GY240 drives the servo attached to it with position pulses at a 70 Hz rate, slightly higher than what you'd find out of the receiver's rudder channel (somewhere in the neighborhood of 60 Hz).

The GY401, when the DS switch is ON, updates the servo at a 270 Hz rate, about four times faster than the 240.

The 240 will essentially drive any servo that you could drive by plugging into your receiver, and will drive it at a slightly higher pulse rate than you'd get from the receiver. At that slow frame rate, you simply won't get all the benefits of a servo such as the S9254 that is designed to take advantage of receiving position updates at the 270 Hz rate.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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03-07-2008 12:00 AM  10 years agoPost 7
rexxigpilot

rrProfessor

Florida

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We agree. I thought you were implying that the high performance servos couldn't be used at all. Thanks for clearing that up.

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › GY 240 question?
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