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HelicopterRadio - Servo - Gyro - Gov - Batt › Throttle servo frequency
12-18-2013 12:24 PM  3 years agoPost 1
Richardmid1

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Leeds, England

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Ah got you thinking right? lol.

Exactly what frequency is put to our throttle servos and which unit determines it, FBl unit or governor? Also why isn't it adjustable?

Im guessing they are all 50-70Hz otherwise analogue servos would suffer?

I know its not an important question but ive never seen it come up before and it is winter!

60% of the time, it works every time!

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12-18-2013 01:34 PM  3 years agoPost 2
Ace Dude

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USA

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The signaling frequency is generated by whichever device the servo is connected to whether it be RX, governor, or FBL controller. Most likely it's not adjustable because standard servos accept 50Hz and using a faster frequency may not improve performance.

  

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12-18-2013 01:46 PM  3 years agoPost 3
Pistol Pete

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Seffner, FL

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http://www.pcbheaven.com/wikipages/How_RC_Servos_Works/

~~Enjoying the hobby one flight at a time~~

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12-18-2013 01:52 PM  3 years agoPost 4
Richardmid1

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Leeds, England

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Thanks guys.
The quick refresh also allows the digital servo to have a tighter dead-band. Moreover, the response of the servo is significantly increased,
So why don't we have governors allowing us to choose say 50hz for analogue and 250hz for digital servos?

If we see an improvement in performance between 50 and 250hz on the tail, why not on throttle?

60% of the time, it works every time!

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12-18-2013 02:08 PM  3 years agoPost 5
Pistol Pete

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Seffner, FL

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Its embedded in the servo amplifier circuitry.

Governor are for regulating head speed. As you know, electric helis have no throtle servo.

Whether going digital on a throtle servo makes a difference or not due to engine lag has been discussed here. But for arguments sake, digital servos with dual ball bearings and metal gears are common and inexpensive, so really a moot point.

But...its winter, like you said.
Going to be a low 70's today.

~~Enjoying the hobby one flight at a time~~

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12-18-2013 02:29 PM  3 years agoPost 6
Ace Dude

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USA

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If we see an improvement in performance between 50 and 250hz on the tail, why not on throttle?
Because the tail can provide nearly instantaneous response.

On the other hand, throttle response on an IC engine is much slower. There's no need for a super fast servo/frame rate on the throttle servo if the engine cannot keep up with the throttle changes.

  

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12-18-2013 04:01 PM  3 years agoPost 7
Richardmid1

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Leeds, England

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Whether going digital on a throtle servo makes a difference or not due to engine lag has been discussed here.
Ah yes but as a 2 stroke IC engine at 15,500 rpm can change its power output every 0.004 seconds (remember the engine doesn't have to increase in speed just its power output which is determined by how far open the carb is).

60% of the time, it works every time!

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12-18-2013 05:26 PM  3 years agoPost 8
BarracudaHockey

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Jacksonville FL

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LOL here we go again

Acedude is right, yanking a throttle arm back and forth faster than you can see it is pointless.

Some governors had a digital servo mode, I think the multi-gov was one, they did away with support for it because there was no benefit

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

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12-18-2013 05:41 PM  3 years agoPost 9
Richardmid1

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Leeds, England

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Ok above a certain point servo SPEED may not make a noticeable difference but I believe RESPONSE time would. I'm sure if you flew a heli with a 2hz throttle response time you would agree with me! Every little helps.

The multigov was a long time ago when a 0.15 cyclic servo was considered fast and the 'tareq' flying style had yet to be invented! Now we have much faster tx rx response, much faster servos and much more aggressive flying styles. I just feel the whole governor/throttle thing can improve to keep up.

60% of the time, it works every time!

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12-18-2013 06:36 PM  3 years agoPost 10
Ace Dude

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USA

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The multigov was a long time ago when a 0.15 cyclic servo was considered fast and the 'tareq' flying style had yet to be invented! Now we have much faster tx rx response, much faster servos and much more aggressive flying styles. I just feel the whole governor/throttle thing can improve to keep up.
We're still flying the same IC nitro engines. Just with larger displacements.

  

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12-18-2013 06:56 PM  3 years agoPost 11
Richardmid1

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Leeds, England

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Yes but they didn't need to react as fast back then.

I guess governors aren't going to be developed further now as more and more fbl units have built in governors which offer simultanious response with the cyclic servos like the tail pre comp settings we have on our tails.

60% of the time, it works every time!

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12-19-2013 02:59 AM  3 years agoPost 12
Dr.Ben

rrMaster

Richmond, VA, USA

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GY701 and 750 have digital and analog mode for governor throttle output.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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12-20-2013 11:39 PM  3 years agoPost 13
Ace Dude

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USA

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There you have it, problem solved.

  

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HelicopterRadio - Servo - Gyro - Gov - Batt › Throttle servo frequency
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