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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Throttle jockey servo
10-14-2010 03:00 AM  8 years agoPost 1
Neon Juripuri

rrVeteran

Peculiar Mo USA

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I am going to put a throttle jockey pro on my raptor with an os 55.
I currently have this servo on the throttle
http://www.advantagehobby.com/produ...productid=45309
JR ST-47
I'm afraid it might not last. Am I correct? or can I fly it as is.
I am trying to read how to set it up. But I'm also afraid I will get it in the wrong mode and burn it out if I use the cheapy servo.

I will upgrade if need be. But if I can get by with this servo for now I will be happy. I'm not good enough yet to need that accurate of a throttle servo, but I do need something to maintain more steady headspeed.
TIA Fred

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10-14-2010 05:15 AM  8 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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Its actually a decent servo. Not particularly fast but you shouldnt have any problems with it.

Andy
AMA 77227
http://www.jaxrc.com

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10-14-2010 07:40 PM  8 years agoPost 3
hgh001

rrApprentice

New Zealand

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Hi,

I've been using Futaba's 9254 (Rudder servo) on all my machines with the throttle max. You need a fast servo to keep up with the Model Avionics limiter / governor application.

In example a 9252 is too slow 0.14s/60' the 9254 is much faster 0.06s/60'.

Heinz

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10-14-2010 08:08 PM  8 years agoPost 4
BarracudaHockey

rrMaster

Jacksonville FL

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Sorry but its a complete myth that you need a servo that fast on a governor.

You're yanking the throttle arm back and forth faster than an internal combustion engine can respond to throttle changes.

Andy
AMA 77227
http://www.jaxrc.com

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10-14-2010 08:22 PM  8 years agoPost 5
hgh001

rrApprentice

New Zealand

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BarracudaHockey,

Have you done the comparison yourself?

Heinz

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10-14-2010 09:28 PM  8 years agoPost 6
BarracudaHockey

rrMaster

Jacksonville FL

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I've tested quite a few servos when hooked to a governor.

Anything in the .15 to .2 range works just fine.

Aside from my point above, the servo arm just doesn't move that far in 3D unless its pulling off the power in a negative pitch descent, in which case the head is running on the auto bearing and how fast the throttle comes off doesn't really make a difference.

EDIT: One final point, the head servos are always under load, while the throttle servo is under 0 load, so even if you used the same servos its going to be faster than the head servos.

Andy
AMA 77227
http://www.jaxrc.com

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10-14-2010 10:15 PM  8 years agoPost 7
hgh001

rrApprentice

New Zealand

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BarracudaHockey,

I'll agree to it that you can use a slow servo on a GV1 without any harm done, have one on my scale machine.

The reason why I suggested a fast servo is because of the quick response from the Revmax/Throttle Max/Throttle Jockey it tends to burn a slow servo due to the quick corrective action done.

I agree you don't achieve much by yanking the throttle arm.

I've seen more than one analogue servo pack up in flight, some pilots can idle it, other machines meet mother earth.

Heinz

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10-15-2010 02:30 AM  8 years agoPost 8
Neon Juripuri

rrVeteran

Peculiar Mo USA

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According to the instructions, in the calibration mode,you have to do an extra step to get to "super servo"mode.
I think I'm going to try the cheap servo in standard mode. The instructions say it will work with any standard servo.
I guess so far it's a tie as far as votes,whether it will work or not.
I have 1 yay and one nay. And the Jack Benny in me also says yay, but that really doesn't count
Fred

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10-15-2010 04:18 AM  8 years agoPost 9
BarracudaHockey

rrMaster

Jacksonville FL

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You might find it interesting to note that Aerospire has done away with digital or super servo (high frame rate) mode in his governors because they provide no benefit.

Now, if you do intend to run super servo mode, then you need a servo who's amplifier can handle the 270 or 333hz update rate, but that has nothing to do with the actual speed of the servo. A 9252 can take high frame rate.

Andy
AMA 77227
http://www.jaxrc.com

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10-15-2010 03:04 PM  8 years agoPost 10
T-Squared

rrApprentice

SMRCF, GA

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BH - FYI, adding to you last point, Model Avionics has also removed the super servo support from their latest version of ThrottleMax governor.

Ron.
Oops - that's not what I meant to do!

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