I'm setting up my first nitro and confused about the relationship between the governor and the throttle curves.

Let's say, for example, my stunt-2 throttle curve is 100-75-50-75-100 and the governor is set for 2,000 rpm for stunt-2.

What is the relationship between the two? What will the head rpm be at the 50 mid-stick?

Your governor takes over and the head speed is what you set the governor to. Throttle curves are ignored but should be set incase it slings a magnet or something happens with the governor

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

Nothing. The governor eliminates (or deactivates) the throttle curve. Once you set up the governor, teaching it your low, idle, and high points, it is controlled by the gear ratio and rpm you set. The only reason you would need a throttle curve is if you throw a magnet or have some other failure that would keep the governor from 'governing' the head speed you set.

Once the governor comes on (depending on if you set it for a certain stick position or head speed) it will maintain that head speed no matter where you have the stick.

Team Futaba, Team Synergy/Rail, Team Scorpion, Team Castle Creations, YS Engines, VelTye

Ahhhh... okay. Thanks guys.

So, the throttle curves are only there in case the governor malfunctions? If so, what is the best curve to use in stunt mode? Is my v-curve sufficient?

I've got the governor set to come on at 20% stick. Does that means that when I take off in NORMAL and get to 20% stick the rpms will instantly jump to what I have programmed for NORMAL?

Yes a V curve is sufficent.

There's a couple of conditions that have to be met, its got to be above the throttle point you mentioned, and with the multigov it has to be within 75 or 80 percent of the target RPM.

Either way, they have a slow ramp up on most governors.

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

Thanks for your help. This all makes sense to me now.

If you're in the air and throw a magnet (or the governor just quits) does it automatically stop over riding the throttle curve?

yes, if it stops functioning, the throttle curves take over..

Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL

It will just shut down and your throttle curves will take over.
If you install your magnet correctly it wont be an issue and in hundreds of flights with several different governors and never had one fail in flight.

Drill a very small hole all the way through the fan. When you install the magnet with epoxy or JBWeld the hole will keep you from getting an air pocket in the adhesive and allow the excess to escape. It will also make it easy to punch the magnet out with a small nail if you ever need to remove it.

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

You guys sure have been a lot of help.

So, if you program in a throttle v-curve to use in case of a governor failure, is any one curve better than another? (Keeping in mind I've never flown a nitro engine.) Or is it best to just use a curve that you've been used to flying from another heli?

I thought some "adaptive" governors like the GY701, the Multigov Pro and the ATG do have the ability to use the throttle curve. It's used to detect a needed change in throttle before the change in head speed occurs. I don't think they use the throttle curve to set the speed, just to sense an upcoming load change that will require a throttle change.

How does all that we've talked about relate to an electric like my Trex 450 Pro? If I have a 100-90-80-90-100 V-curve in idle-up can you look at those numbers as a percentage of the maximum RPM?

Dont try to mix and match electric and nitro, they behave differently.

Guys run 100-100-100 on electric, try that with a nitro you'll blow something up.

Don't get caught up in what a perfect backup throttle curve is for a backup, for what you're doing a straight V curve is fine.

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

I thought some "adaptive" governors like the GY701, the Multigov Pro and the ATG do have the ability to use the throttle curve. It's used to detect a needed change in throttle before the change in head speed occurs. I don't think they use the throttle curve to set the speed, just to sense an upcoming load change that will require a throttle change.

The 701 governor in OPTIMIZE mode works this way.

Ben Minor

Team Futaba Team Kontronik USA

DON'T USE JB WELD! to glue your magnet in. This is stated very clearly in instructions, use epoxy instead. I know many have used JB Weld with no issues, but why risk it, the epoxy holds very well. I have never thrown a magnet and have only heard of one who did, and knowing him, he may have just CA'd the magnet in.

Team Futaba, Team Synergy/Rail, Team Scorpion, Team Castle Creations, YS Engines, VelTye

Yawn. Been debated a lot but I've never actually seen JBW interfere with a magnet. IMO a wives tale

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

Edited.

Team Futaba Team Kontronik USA