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ProModeler Scorpion Power
HelicopterRadio - Servo - Gyro - Gov - Batt › GV-1 Overspeeding
03-09-2006 06:38 PM  11 years agoPost 1
kdog

Heliman

Chicago

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I haved searched topics on this subject but none seem to match my issues:

I have a R50 with GV-1 standard OS50 and 9CH. Problem is when I switch on the GV-1 from my normal flying throttle/pitch curves the GV-1 goes to full throttle first and after a few seconds seeks out the Idle 1 set point of 1650. I have made sure the throttle limits are correct in the GV-1 set-up.

The only thing I can think of is if when I'm in normal mode (GV-1 off)and the head speed happens to over the 1650 RPM idle 1 set-point and I turn on the GV-1 the unit seeks up first to find the set-point rather than down.

If I switch on the GV-1 at or below 1600 RPM it seeks the 1650 RPM just fine. Why can it not adjust no matter what the current headspeed is before engaged?

This causes severe overspeeding for several seconds until the GV-1 adjust down properly. (Idle 2 is 1900 RPM)

Any reason for this? How to avoide this problem?

Thanks!

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03-09-2006 06:43 PM  11 years agoPost 2
kdog

Heliman

Chicago

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I forgot to mention that the sensor reads 97% and I have no overspeeding problems going from idle 2 to idle 1 and off which tells me my mixture needles are correct.....

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03-09-2006 08:31 PM  11 years agoPost 3
Phaedrus

Key Veteran

S. Orange County, California

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I had the same problem

Here's how I "cured" it. What I found was that there is a delay while the GV takes over. In the interim period the throttle will respond depending on where the throttle curve is for the current condition.

In my case when I went from Normal, where the GV-1 was "OFF" to Idle Up 1 with a headspeed of 1700 set (for hovering) the throttle would react to the throttle curve that was set in the Idle Up 1 condition while it waited for the GV-1 to take over.

There can be a significant lag in this. If your throttle curve between the Normal and I/U is way different, then you will get this. I had a linear curve, i.e. no curve set in I/U 1. The mid point was essentially 50% of the throttle throw.

However, at zero pitch this was WAY too much throttle. My normal curve has only 20% of throttle throw at mid-stick. So when I threw the switch the throttle would jump to the 50% position and the engine would SCREAM for a few moments, then settle in nicely.

So what I did was to match my Idle up Curves from the mid point up to my normal curve. Now I get no change until the GV takes over and the throttle ramps up to the set value. I use 1700 in I/U 1 for hovering and 1900 to 1950 in I/U 2 for flying around.

Make sense??

My throttle is set up with the balls on the inside hole on the throttle arm (OS 50 Hyper) and the 2nd hole out on the servo arm. Throws are 100% ATV. I have a snake looking throttle curve in normal. The bottom line was I figured out that the Hyper produces so much power that at 0 pitch you only need +/- 20% of the throw. 50% and it SCREAMS.

So match your throttle curve in your Idle up to your normal curve from mid-stick up and the weird over speed will go away.

AMA Leader Member
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Team Futaba

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03-09-2006 08:39 PM  11 years agoPost 4
kdog

Heliman

Chicago

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I think you nailed it - thats exactly whats going on - I wish Futaba would state the delay in activation. My throttle curves in idle up 1&2 are a straight line 0,25,50,75,100. In normal my mid-stick is about 27% up to 82% tops for decent head speed control with OS50 standard & Hatori JK.

This explains why my head speed also screams at 50-65% throttle and 5.5 deg pitch before the GV kicks in at idle 1.

Thanks for your help!

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03-09-2006 08:47 PM  11 years agoPost 5
Phaedrus

Key Veteran

S. Orange County, California

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There is a way to adjust the delay by accessing the "secret menu" but I decided not to mess with that. This was easier.

Mine is set such that when I throw the switch between Normal or I/U 1 or 2 I get no change at all until the GV-1 starts to take over.

In I/U 1 I hear almost no change at all above mid stick even after the GV-1 takes over, which tells me that my Normal throttle curve is giving me +/- 1700 RPM. If I go straight to I/U 2 (1900 RPM) I'll hear the engine ramp up after a few seconds, but it is a normal increase and not the weird over speed I got before.

AMA Leader Member
Go FASST, or Go Home!!
Team Futaba

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03-09-2006 08:57 PM  11 years agoPost 6
kdog

Heliman

Chicago

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I'm surprised the GV does not have the "smarts" to hold the current throttle position when immediatley activated while it thinks about what to do for those few seconds. This is something Futaba should revise in the software.

I'm surprised that more people using the GV are not having this issue - or do they know to copy the normal throttle curve for idle up 1&2?

I wonder how the Throttle Jockey works....

Ummm - thanks for the info!

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HelicopterRadio - Servo - Gyro - Gov - Batt › GV-1 Overspeeding
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