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HomeAircraftHelicopterMain Discussion › How does a governor work and how do you adjust it etc....
03-08-2013 02:24 PM  5 years agoPost 1
HeliNutAndy

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worcester, MA USA

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I recently purchased an NX4 with a GAUI Governor and I understand that it keeps the head speed at a desired level. I have a few questions. How do I adjust the governor? I am using a DX7s for a radio and will be plugging the governor into a mini-vbar. How do I know what the head speed is? Do I need some type of tachometer? Do I really need it or is it just a nice feature to have? The governor came with a manual but it is not too detailed.

Thx for the help.
~Andy

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03-08-2013 02:59 PM  5 years agoPost 2
cudaboy_71

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sacramento, ca, u.s.

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lots of questions to answer. I'd start by saying the mini-vbar includes a governor already. if possible, i'd return the gov that you got with the gaui and purchase a $3 phase sensor and use the governor built in to the vbar, which will be far superior to anything external to the flybarless unit that you might use.

once you decide to do that, then setting up the vbar's governor will likely be a bit different than setting up an external one...not to mention there are some good vbar videos on youtube that already detail how to set it up.
How do I adjust the governor?
depends on the governor, really. typically (read these days) a range in your throttle designates one of 2-3 headspeed values you've assigned to the governor. in other words, say you set the governor to 1950RPM for 'speed1', and 2100RPM for 'speed2'. Then you'd assign a 60% flat curve to idle 1 that would activate 'speed1' and 85% flat curve to idle2 that would activate 'speed2'. again, those are just example numbers. it depends on each unit as to where the 'speedx' ranges exist.
How do I know what the head speed is? Do I need some type of tachometer?
typically, the governor will need some gearing information. this information is used in the governor to achieve the desired headspeed. But, yes--to really know what your headspeed is you'd need a tach of some kind. skytach is really nice (and expensive). there are also some pretty decent smartphone tachs that work off of sound.
Do I really need it or is it just a nice feature to have?
depends on your level of flying, i suppose. i don't think a beginner will really feel the value of a good governor. But, having a consistent headspeed does make the heli more predictable in direction changes and aerobatic maneuvers (lift is consistent throughout the collective).

hope that helps.

Watch at YouTube

if it ain't broke, break it.

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03-08-2013 06:25 PM  5 years agoPost 3
HeliNutAndy

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worcester, MA USA

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Thank you for the detailed response. I don't have the time right now to watch the video you posted and to read through your explanation. I will read through it later today/tonight. Thx again.

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03-08-2013 06:58 PM  5 years agoPost 4
dkshema

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Cedar Rapids, IA

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Cudaboy's response appears to have been written not knowing that the Gaui NX4 is NOT an electric heli, it is a nitro powered heli.

There is NO phase sensor, and you can't go that route, as you aren't controlling an electric motor.

-----

In general, your governor uses a hall effect sensor (sees presence/absence of a magnetic field) to sense speed. On the fan of your NX4 are two indentations near the outer edge, designed to hold small magnets that usually come with the governor when you buy it. You epoxy the magnets into the fan, usually one with north up, the other with north down (the sensor will usually only sense one direction, the second magnet gets glued in to maintain some semblance of fan balance to keep vibes down). The second magnet is along for the ride, but does nothing.

With the sensor installed on the frame of the heli such that it senses the magnet on the fan passing by, the electronics can then figure out what speed the motor is turning. The motor RPM, coupled with knowledge of the main gear to motor pinion gear ratio, allows the governor to try to maintain a fixed rotor RPM. With some governors, you tell them the gear ratio through one of the setup menus, with other governors you use other means to select the desired head speed to maintain.

-----

With the nitro motor, the throttle servo plugs into the governor and the governor plugs into the receiver, in the same manner as a tail rotor gyro does. The governor, when engaged, then modulates the throttle servo based on the desired RPM setting and the RPM that it's sensing, to try to maintain set head speed.

Ignore the Vbar thing for a moment, let's assume you are hooking up a stand-alone governor (Throttle Jockey Pro or Gaui Governor, for example) to your receiver. The governor plugs into two separate receiver plugs. One goes to the throttle channel, the other goes to an "auxiliary" channel. Just like a gyro with its rudder lead, and its gain lead. The servo plugs into the governor, again, like a gyro. And the sensor plugs into the governor.

-----

With your DX7s, you have two built-in menus to help you. One is for the Gyro Gain -- and that in your transmitter is set to run using Channel 5 of your receiver. The gyro gain lead plugs into channel 5 of the RX. You use the Gyro Sense menu to set the gyro.

The GOVERNOR's "gain" lead, plugs into receiver channel 7, as that is where your transmitter is set to default. You THEN USE your transmitter's GOVERNOR menu to control the governor. Values set into the GOVERNOR menu then set the desired RPM for each flight mode.

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The governor typically won't even engage until the throttle setting is above something on the order of 15-25% of throttle. This allows you to start the motor with the throttle set to idle, set the heli down, and walk away without the governor trying to take over and run to the set RPM.

Once you advance throttle past the trigger point, the governor takes over and runs things. If you drop throttle below the trigger point, you have control again and the governor is out of the picture.

-----

Since this is going to be a nitro heli, do NOT use flat line throttle curves, set proper throttle curves for each flight mode. The reason being that if you lose a magnet, or the sensor fails, or the governor pukes, the governor returns control to the transmitter stick position. If you have a high-flat line curve and the governor goes south on you in flight, you risk overspeeding the motor and breaking the con rod.

-----

Normally your idle up 1 and idle up 2 throttle curves will be set such that when operating in either flight mode, the throttle never drops below the trigger setting and the governor stays engaged. If it fails, then the transmitter throttle curve becomes the master and motor RPM is back under your control.

For normal mode, you may choose to leave the governor disabled, or you can choose to let it engage when you advance throttle above the trigger point. That's up to you.

-----

As for the specifics of how you use your governor with a V-bar installation, since I am not familiar with a V-bar setup, I have to defer to others who may help you.

-----

Governors are not required, with good throttle and pitch curves you can achieve a constant head speed. Governors are nice to have, not necessary.

-----
Dave

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

Team Heliproz

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03-08-2013 08:07 PM  5 years agoPost 5
BobOD

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New York- USA

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Here's some info regarding nx4/gaui gov and miniv that comes as a package.
Should help you get going.
https://rc.runryder.com/t727852p1/

Team POP Secret

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03-08-2013 08:25 PM  5 years agoPost 6
HeliNutAndy

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worcester, MA USA

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Here's some info regarding nx4/gaui gov and miniv that comes as a package.
Uh that's a thread I opened thx anyways.....

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03-09-2013 12:17 AM  5 years agoPost 7
BobOD

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New York- USA

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LOL
Sorry, just noticed that.

Team POP Secret

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03-09-2013 01:23 AM  5 years agoPost 8
McKrackin

rrProfessor

Lucasville,Ohio

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Right, I figured I'd direct him there rather than repeat it all.

That OK?
You're talking to the OP and he is the one you're directing there after he said he already read the thread...lmao....Do people even look at the threads anymore?lol....

AND he's the OP in both threads.lmao...lol....

Listen here Helinutandy...I'm trying to direct Helinutandy to a thread started by Helinutandy...Is that ok with you,Helinutandy?lol....

Sorry but I had to play with that one

dkshema nailed it.

I literally never use the word literally right.

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03-09-2013 02:20 AM  5 years agoPost 9
cudaboy_71

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sacramento, ca, u.s.

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got me. i did not know the nx4 was a nitro until after i had composed the post. then, i hastily went back an tried to modify it (including changing the video to mr. mel's nitro video). however, the phase sensor slipped by.

sorry for the bad info. but, as already described a hall sensor easiy replaces the phase sensor. likely the $9 align sensor and included magnets can be made to work with the vbar. i still don't see the need to use an external gov when the vbar's is so superior. note: that by superior i mean only because its function is integrated into the flybar unit. it is an integral/active part of the FBL equation in the vbar software. if you use an external governor it will be reacting to disc loads rather than anticipating them.

if it ain't broke, break it.

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03-09-2013 02:23 AM  5 years agoPost 10
McKrackin

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Lucasville,Ohio

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I didn't think the Mini V Bar had a nitro gov.

Hmmmm

I literally never use the word literally right.

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03-09-2013 03:17 AM  5 years agoPost 11
BobOD

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New York- USA

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Thanks for the hammer blow to the head McKrackin, I apparently needed that.
Sorry Helinutandy, I thought you were someone else.

Yes, dkshema described it well.

The ch3 (throttle in) basically passes out to the throttle servo except when the gov is active. The gov is active when enabled by the ch7 aux and when the ch3 is above 30%. The value on ch7 will set the governed RPM.

Here are some starting numbers. What head speeds do you want to run?
Using TX gov function on my DX8.
Normal = -10%
Stunt1 = 40%
Stunt2 = 60%
These are the values output on ch7 based on the f mode position.

Set your throttle curves as per the Gaui manual.

Yes, you will be best to have a tach to see where you're at.

Team POP Secret

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03-09-2013 04:52 AM  5 years agoPost 12
McKrackin

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Lucasville,Ohio

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Just playing.lol..

Some really good info in this thread...

Have a great weekend everybody

I literally never use the word literally right.

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03-09-2013 05:46 AM  5 years agoPost 13
BobOD

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New York- USA

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Actually, it'd probably be easier to just sell the mini vbar and gaui gov and get a full size or an Sk540. Punch in your desired RPM and be done with it.

Team POP Secret

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03-09-2013 01:30 PM  5 years agoPost 14
Ace Dude

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USA

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I'd keep the VBAR and get an Aerospire Multigov Pro. I've been using the MGP on my Vibe 50 for years and it works great. Since the inital setup several years ago I touch it once and that was just to change the head speed.

  

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03-16-2013 06:32 PM  5 years agoPost 15
HeliNutAndy

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worcester, MA USA

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I attempted to setup the governor with no luck. When I advance my throttle to above 30 percent the green light on the governor comes on but I cannot get the gain to function. I have the gain connected to RX A on the minivbar and have attempted to assign every switch I can to get the gain to function but still nothing. I also went into the Vbar config file and changed register 216 to the value 4 and 6 without success (http://www.66pacific.com/vbar_extra_channel.aspx). It is frustrating when you purchase this gear in a combo and there are no clear instructions and I am just hacking away trying to get it to work

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03-16-2013 08:20 PM  5 years agoPost 16
RCHSF

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NC

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Can yawl make it any more complicated.

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03-16-2013 10:18 PM  5 years agoPost 17
HeliNutAndy

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worcester, MA USA

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Can yawl make it any more complicated.
LOL. I am just trying to get it working. If anyone has any suggestions it would be greatly appreciated. Also, I noticed that my throttle servo is pulsing when connected to the governor. It's not moving much but enough to worry me. Where are the MiniVbar experts?

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03-17-2013 12:29 AM  5 years agoPost 18
BobOD

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New York- USA

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Probably best to go to the vstabi forum for that one....or seek mrmel's advice. There were issues like this passing the signal through external govs years ago but I thought they were corrected with a firmware update.

Team POP Secret

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03-17-2013 07:18 AM  5 years agoPost 19
Cra-Z-1

rrApprentice

Washington,UT-USA

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I didn't think the Mini V Bar had a nitro gov.
There is definately something going on there;

Check the charts out via this link, if you are flying a Nitro heli

http://www.vstabi.info/en/featurematrix

According to this chart, mini-V is not Nitro friendly, and if you look at the asterik description at the bottom, it leads you to think that an electric heli gov (Phase-tach sensor) can be enabled (E-Gov), but I'm assuming that NOT a hall-Effect (magnetic) sensor?

Ban the Ban.

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03-17-2013 03:20 PM  5 years agoPost 20
HeliNutAndy

rrKey Veteran

worcester, MA USA

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I have gotten a little bit further on this. I have the governor gain connected to RX A on the mini-vbar which is channel 7 aux2. In my tx(DX7S) I have the governor enabled and working off my gear/mix switch which is a two way switch. When the switch is set to position one(0%) the governor shows a red light or should be off. When I set position 2 to 30% and enable the switch the governor enables(green light is on) and appears to be on. I have several questions.

1) Typically the governor should turn off when the throttle stick is below 30%. This is not happening. How can I get this to work?

2) If the governor is working or when it is on shouldn't the throttle servo move to wide open because I have no rpm with the heli not running and I would think the governor would try to get the rpm higher in turn moving the servo.

3) How could I adjust the head speed?

If I unplug the governor gain the governor light turns green or appears to enable after I move the throttle past 30% and appears to be functioning but I don't think I could adjust the gain or head speed.

I'm hoping by adding some more details to this thread someone out there may have some ideas.

TIA,
Andy

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