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HomeAircraftHelicopterHelicopter Main Discussion › DX9 Throttle Hold Delay with nitro?
10-21-2014 02:24 PM  4 years agoPost 1
meowguy

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Saco, ME

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This is my first transmitter equipped with throttle hold delay. Whenever I have done a power recovery (bail-out) from an auto on previous radios the heli gets all out of shape when the hold switch is return to normal. I am assuming this delay feature will help prevent that. My initial setting is 1.5 seconds. Does that sound about right to the nitro guys? It looks good when dry firing it on the bench with a graceful return of the throttle from low to stick position.

"Sweet dreams and flying machines in pieces on the ground." J. Taylor

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10-21-2014 02:46 PM  4 years agoPost 2
Rudy

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Houston TX/Bend OR

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I have never user a delay on throttle hold. If I need to bail out of a auto, I need to bail out NOW not after some delay.

The only reason for your helicopter getting "out of shape" during a bail out is the inputs you are giving it on the stick. In reach for the hold switch you could be bumping a control with out knowing it.

I would remove the delay, and then go out and practice some auto bail outs so you get use to it.

The only place where a delay MIGHT be useful would be on a high power electric helicopter. There might be times where the power comes on just to fast, but that is not a problem with a nitro.

Rudy Ackerman Houston TX/Bend OR

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10-21-2014 03:01 PM  4 years agoPost 3
goof2

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Bristol,CT

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The delay is not necessary but can prevent the heli from getting out of shape when recovering from an auto. Also if you run your blades a little loose they have less of a chance of folding up. But 1.5 seconds is a long time when heli is falling I would start at about .5 seconds.

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10-21-2014 03:10 PM  4 years agoPost 4
Rafael23cc

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Junction City, KS

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I was about to suggest the same thing: 0.5 seconds. 1.5 is too long. I just had an experience this last weekend with a nitro 700 with no delay. The tail took a good swing and caught me off guard. Why did I bail out when it wasn't necessary? No clue! I just did for some reason.

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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10-21-2014 03:11 PM  4 years agoPost 5
Pistol Pete

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Seffner, FL

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The delay works both ways and I believe ut can be programmed independently for high and low stick. I have not played with this featufe at all.

For electrics, its like a gradual head speed change delay, especially when bailing out. Similar to what castles ESC have.

Lets us know how it works for you during bail out.

FWIW
Set pitch curves on TH to match the curve you normally fly with. No sudden jump or surprises when switching.

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

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10-21-2014 03:15 PM  4 years agoPost 6
Four Stroker

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Atlanta

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The out of shape he is referring to is the tail spinning around when the clutch engages and the gyro can't keep up. Also as stated, run the blades slightly tight so they won't fold up. I set my gyro gain in HOLD mode very high - like 80% on a 520. As stated, 1.5 seconds is dirt nap time. 0.5 seconds is a good first guess.

Are you using the same pitch curve for HOLD as whatever you start from ?

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10-21-2014 06:11 PM  4 years agoPost 7
meowguy

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Saco, ME

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Are you using the same pitch curve for HOLD as whatever you start from?
Yes, same pitch curve as my 3D flight mode.

The 'out of shape' I am referring to is the tail spinning around. I would like to try the suggestion of turning up the gain on the gyro in the hold mode. I'll bet that will calm it down. I think I will lower the dely to 1/2 second and work from there.

Thanks for the input.

"Sweet dreams and flying machines in pieces on the ground." J. Taylor

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10-21-2014 08:59 PM  4 years agoPost 8
crflyer

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Maine

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I have my delay at 1.5 and it comes back smooth with no tail kick.
Just don't wait to long,lol

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10-21-2014 10:30 PM  4 years agoPost 9
ticedoff8

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Morgan Hill, CA. USA

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meowguy:
It sounds like you are letting your headspeed drop off too much during the autorotation or the ramp up on the bail out is too quick.

If you try to milk an autorotation, bleed off too much headspeed or the ramp up is too quick and you bail out the heli will tend to spin.

If it isn't low headspeed, what you would be looking for is to adjust the "ramp up" for your bailout.

When you switch from throttle hold on to off, you want a gradual ramping up of the throttle. Not a sudden switch back to full power.

I don't think the bail out delay on the DX9 may not be what you want.
I don't use that feature on my DX9, but when I played with it, all it did was delay the time from when I switched off throttle hold until the throttle servo started to move. It didn't change the speed of the servo as it moved.

Do you have a gov? If so, look in the gov manual for adjusting ramp up.
If you don't have a gov - then get a gov.

My Skookum SK-540 has the ramp up setting and that controls how quickly the gov advances the throttle to reach the proper headspeed.
If I set the ramp up too high, it advances the throttle too quickly to recapture the headspeed, and it will jerk the nose around.
If I set the ramp up too low, it moves the throttle so slowly that I may not be able to get enough power back in time to bail out.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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10-22-2014 01:27 AM  4 years agoPost 10
Pistol Pete

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Seffner, FL

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I don't use that feature on my DX9, but when I played with it, all it did was delay the time from when I switched off throttle hold until the throttle servo started to move. It didn't change the speed of the servo as it moved.
That may have changed since you last played with it. Check it out again.

What I have noticed is that it ramps up from TH ON to full 100% in whatever seconds programmed and less time if stick is lower.

Say your stick is at 70% and you programmed 5 seconds, it will actually take less than 5 seconds to reach 70%.

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

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10-22-2014 01:50 AM  4 years agoPost 11
meowguy

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Saco, ME

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I am using a governor. I will check that setting. I observed the throttle moving rather slowly on the delay setting, but you must set the delay to at least 1.5 seconds.

"Sweet dreams and flying machines in pieces on the ground." J. Taylor

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10-22-2014 03:46 PM  4 years agoPost 12
meowguy

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Saco, ME

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Looking over these posts and the AR7200BX Governor Instructions, I am completely confused.

The governor instructions have a Bail-Out Function which as described does the exact opposite of what I want. That function rockets the throttle open so fast that the user is warned it could cause a mid-air boom strike if the blades are not tight enough. This is the exact opposite of what I think a bail-out function should do. I want a softer startup so the heli does not over torque and spin around.

Then it was suggested by a post in this thread that I turn up my gyro gain in the hold mode. To my thinking this is closing the door after the horse has left. When I bail out of hold, I am immediately put in my 3D gyro setting in flight mode-2...too late for the hold gyro setting.

So after all this I am just going to go with the hold throttle curve delay setting of .50 seconds as a starting point and see if this accomplishes what I am after. I'll try a few bailouts up high to see how it works.

"Sweet dreams and flying machines in pieces on the ground." J. Taylor

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10-22-2014 03:51 PM  4 years agoPost 13
Pistol Pete

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Seffner, FL

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The bail out function is for electrics due to the soft_spool_up feature found in ESCs.

This enables exactly what you described, fast throttle response as opposed to a soft spool up.

Not meant for wet fuel helis.

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

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10-22-2014 08:15 PM  4 years agoPost 14
meowguy

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Saco, ME

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Not meant for wet fuel helis.
Confirms my suspicion. Thanks.

"Sweet dreams and flying machines in pieces on the ground." J. Taylor

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10-22-2014 09:32 PM  4 years agoPost 15
goof2

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Bristol,CT

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There is no reason you cant use it on wet fueled helis. Just remember when you bail out of an auto try to have collective at or near mid stick. Wait for motor to come alive before adding in pitch. The heli usually spins when to much pitch is in before you give the blades time to recover. This is when you lose tail control.

If you climb out...
then hit TH and leave the collective high...
wait for the head speed to decay ...
reengage motor with collective still high...
More than likely heli will spin!!!!

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11-10-2014 03:15 PM  4 years agoPost 16
meowguy

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Saco, ME

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Had a chance yesterday to try out the throttle delay in the HOLD throttle curve with the DX9 for power recovery from an auto. The .5 sec setting is perfect. The big 700 spun up nice and straight about one foot off the ground and completely steady. The tail had no tendency to blow out. Gyro gain set exactly the same as 3D mode. Takes all the anxiety out of doing autos. I'm happy, very happy with this DX9 for sure.

"Sweet dreams and flying machines in pieces on the ground." J. Taylor

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