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HelicopterAlignT-REX 600N › Throttle curves.
12-18-2011 03:53 AM  5 years agoPost 1
Michaelm0268

rrApprentice

Louisiana

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I'm setting up my align 600n with an os 50. I do have a revlimiter(Ar7100R). Im trying to get advice on the best throttle curves(V-shaped maybe?) for idle up mode(1 and 2). I have linear pitch curves. Any help will be greatly appreciated!!

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12-18-2011 04:31 AM  5 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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Take a look in your 600N manual. There is a page showing throttle AND pitch curves for various flight modes.

Start with those and fine tune when you go out to fly.

-----
Dave

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

Team Heliproz

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12-18-2011 04:44 AM  5 years agoPost 3
Michaelm0268

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Louisiana

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I'm using the Ar7100R revlimiter and have my curves right now set to %100 in idle 1 and idle 2. I was wanting to differ idle 1 from idle 2. How can you do that with only one setting from travel adjust? Do I just set one to say %90 throttle instead?
Thanks

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12-18-2011 04:59 AM  5 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

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Which radio are you using?

Must be a Spektrum or JR 2.4 G system since you have the 7100R receiver.

Set your Throttle Curves in your throttle curve menus in your transmitter. You should at least have the ability to set a curve for Normal, Idle Up 1, and Idle Up 2.

Having a limiter in the mix should not make a difference about WHERE or HOW you set up your throttle curves. Set them up as if the Limiter weren't in the picture.

Set your Pitch curves in the Pitch Curve menu. Again, you'll at least be able to set up curves for Normal, Idle Up 1 and Idle Up 2.

Transmitter travel adjust for throttle is only used when you first set up your throttle linkage. At low throttle stick and low trim, you want the throttle barrel to the point where the venturi opening JUST closes off when you're looking down into the carb. The throttle low-side travel limit should be as close to 100% as you can get at this stick and trim setting. The servo should NOT be mechanically stalled at this setting.

At full throttle, the carburetor barrel should be wide open, and the travel limit setting in the TX should be close to 100% here, as well. The servo should not be mechanically stalled at this setting, either.

You need to experiment with distance out from servo wheel center, and the distance out from throttle arm center as far as mounting the linkage balls to get those throttle settings without varying a long way from the 100% settings on your TX travel adjust for throttle.

The 600N manual gives you some good drawings on throttle linkage geometry, as well.

Once you have the mechanical travel properly set, calibrate the 7100R so it knows where full low and full high throttle is.

Then, set your throttle curves in the THROTTLE CURVE menu of your transmitter for the different flight modes. Again, use the curves in the 600N manual as a starting point for your different flight modes.

The last step would be to set the limiter function in the 7100R per its manual.

Remember, Travel Adjust and Throttle Curves are two different animals. Know which one to adjust.

-----
Dave

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

Team Heliproz

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12-18-2011 05:10 AM  5 years agoPost 5
Evan03

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Idaho

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Wouldn't 100 across the board work best the throttle curve would keep the rpm were your limiter is set 1900 2100 ? Then its working like a governor?

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12-18-2011 02:42 PM  5 years agoPost 6
gftazz

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upstate N.Y. in the​Adirondacks

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Here is where mine are at.

Do what DKSHEMA wrote to get set up properly.

Then what I do is used a ramp up of 0-30-60-80-100 in normal mode then in Idle up 1 I went 100-85-65-85-100 because I remember reading in the rev limiter instructions it says to not go under 60-65 at the mid point for it to work at it's best or something like that been a few years since I last read it. Should be simular on the AR7100R.

Then in Idle up 2 I did 100% straight across all the throttle positions.

When I change Idle ups from 1 to 2 I can hear a difference between the two rpm wise. So I use 1 for regular flying (loops, rolls, inverted, backwards, tooling around etc.)and 2 for the 3D stuff.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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12-19-2011 01:38 AM  5 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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Wouldn't 100 across the board work best the throttle curve would keep the rpm were your limiter is set 1900 2100 ? Then its working like a governor?
No, it wouldn't be "working as a governor". The function of a limiter is solely to LIMIT the maximum RPM. If your throttle setting is BELOW the level at which the LIMITER kicks in, you're flying on throttle curves. The limiting function is designed to operate with decent throttle curves, as that is what is controlling the throttle until you should overspeed, at which point the Limiter slows things down a bunch.

A governor, on the other hand, will modulate the throttle (essentially disconnecting servo control from the transmitter input) to maintain a desired RPM. The governor only drops out when the throttle input setting drops below a pre-determined value, usually somewhere in the 25-30% throttle range.

Whether you are using a Limiter OR a Governor, it is a really really good idea to set up decent throttle curves anyway, as if you should lose a magnet in the fan, or the sensor should suddenly decide to puke, the Limit/Governor function is disabled and reverts to allowing control from the transmitter.

With a 100% throttle curve, that would mean you would have 100% throttle, no Limit or Governor function, and one wild ride.

-----
Dave

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

Team Heliproz

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12-19-2011 01:42 AM  5 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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FWIW to other posters here -- I've been PM'ing the OP with more specific instructions on transmitter setup. It appears that part of the problem is the OP is not that familiar with what his radio can and can't do for him.

He seems to be doing quite well, based on his responses.

-----
Dave

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

Team Heliproz

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12-19-2011 01:47 AM  5 years agoPost 9
Michaelm0268

rrApprentice

Louisiana

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I appreciate all the help. I get how to use the dx-7 but it is first time setting up the revlimiter. I was trying to get different rpms(not just by throttle curves) by just switching flight mode switch and not use the gear switch as well. I want to keep it around 1910 to 2000 rpms.
Thanks again

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12-19-2011 05:15 AM  5 years agoPost 10
Evan03

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Idaho

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You would only be running unlimited if your limiter malfunctioned.
In stunt mode I'm hovering about 90% with midstick 80% 100 would be no big deal and I'd hit the switch normal mode.

Ill be picking up a dx7 this week and plan to run the 7100r it has a backplate sensor so magnets to fall out.

It sure seems to me if the motor is tuned well and limiter set to 2000 with a 100 curve that it would maintain that rpm pretty close under load and no load.

I find this thread very interesting I'm flying a dx6i and curves right now. The only time I might see a limiter being usefull is with overspeeding at midstick. What the 100% curve does is make the limiter work the entire time except the 100 curve is there to take over as needed to keep it at the limited speed.

Maybe I'm thinking to hard and the limiter would be working most the time even with 80 at mid stick

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12-19-2011 06:11 AM  5 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

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By using the flight mode switch in the DX7 may be tricky. May require some mixing. Would have to look further into the DX7...

-----
Dave

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

Team Heliproz

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