Curtis Youngblood ATG settings

[RotorBlade]

Guys - been working hard on my first loops with a Trex500 and having loads of fun.
Today I tried for the first time with the Raptor 50 Titan SE/OS50Hyper/CY ATG.

It went up over the top just fine, but the engine seemed to lose power on the descent causing an alarming drop in height. As it bottomed, the blades sort of auto'd, the engine sprang back to life and the heli came out of the bottom of the loop about 10 - 15 feet off the ground having started the loop at least 50 - 60 ft up!! A scary moment!

I have the CY ATG in basic mode and used the engine kill point to set the low point. Gear ratio is 8.5:1:4.56 and the RPM set for 1800 & 1900 on the gear switch (active).
Reading the manual again, it seems to note this behaviour and suggests re-setting the low point with the trim above the engine kill point.

Has anyone else suffered this - any suggestions as to how many clicks to give the trim?
It seems otherwise to be trial & error. I did it twice today and don't relish another low pass tbh!
Thanks for any advice
Keith

[horsham rc]

i will soon have the same gov fitted on my raptor 60 and will be looking for setup help to. so i will be watching this tread.

[Paulice]

It sounds like from you post that you were not in Idle-up and more in normal mode and the gov fell out of operation as you reduced the pitch going over the top
in the idle-up modes you should have a straight line in the throttle curve and use the gov channel to adjust the governed head speed.

[RotorBlade]

It sounds like from you post that you were not in Idle-up and more in normal mode and the gov fell out of operation as you reduced the pitch going over the top
in the idle-up modes you should have a straight line in the throttle curve and use the gov channel to adjust the governed head speed.

Negative - was in ST-1.
Th curve is not flat though 52-52-52-75-100 for ST-1 & 2

[Paulice]

What is your pitch curve like then?

[RotorBlade]

Linear for all.
I just checked - RPM definitely set for 1800 & 1900 on gear switch and with trim in the engine kill position (fully down) plus throttle at lowest, the green light comes on at input 29/output 52 (ST-1 & 2). I clicked up 20 clicks of trim and re-set the L position and now the green light comes on at input34/output 52.
I don't understand what throttle low actually means though. Surely, if the throttle in basic mode is set to 1800rpm, that's what it should maintain.....?
Or on the descent does it cut the power to 35% of zero. Is that the issue, that gravity/airflow makes the rotors turn so the governor cuts the power.
Many thanks, Keith

[Paulice]

the low setting is for when you use the gov in all modes except hold
in normal mode at about 30% throttle stick from the bottom will turn the gov on by 30% nearly all heli's have some sort of head speed then the gov will take over and ramp up to the set head speed, I think what happened is the gov turned off, I always set the heli to fly without the gov keeping the head speed about how i like then when the heli fly's in all modes turn on the gov to hold the head speed better. that way the gov only fine tunes the throttle, and if you ever have a sensor failure the heli will still fly as it did before you enabled the gov.

[RotorBlade]

That's what I guess I don't understand. If the governor cuts in from 30 (or 35%) throttle and the revs are set at 1800, why would the governor decide to cut out when the collective is pushed all the way to 100% and the heli is in danger of planting itself in the ground?

Surely the governor aims to maintain the given headspeed, not cut out!

Lastly - how accurate are the headspeed settings do you reckon? I've read that they are only approximate - perhaps I don't actually have 1800rpm!
Back in January, after a minor crash :-( I landed and the governor wouldn't cut out - had to wait for the fuel to run dry!
I re-set everything as per instrux but set the gear traveladjust to +70/-90 (as recommended for 1800/1900 rpm on gear switch - lights correct) whereas before it had been +80/-70 and had been looped & flown inverted by two friends without this issue.
Wondering.....
Thanks for the help
PS
What about cheese-less traps:-)
Keith

[RotorBlade]

Decided to get rid!
I have an Align RCEG600 on my 90 and SiG emailed me with one from the BMFA classifieds last night, so I bought it and will swap it out.
Cannot afford to 'plant' a Raptor 50 for the sake of a confusing governor!
Cheers
Keith

[horsham rc]

Decided to get rid!
I have an Align RCEG600 on my 90 and SiG emailed me with one from the BMFA classifieds last night, so I bought it and will swap it out.
Cannot afford to 'plant' a Raptor 50 for the sake of a confusing governor!
Cheers
Keith

oh well that wont help me much if i get mine, oh well will have to hope is ok for me.

[RotorBlade]

Let me know if you want it - I'm sure it's only down to setting it up correctly, but for me, not worth the risk.

[Paulice]

I'm sure it's a setting you have wrong,
The one i had was great i only changed/ removed it because i beta tested the V-bars gov and have used that ever since. the ATG is a great bit of kit, and loads better when set up than the align 600.

[RotorBlade]

You may well be right - the biggest pain fitting the Align will be dropping the motor to add a magnet!
Do you think that re-setting the low point could cure it?
Might be worth a reprieve - I just wish these manuals were more understandable - even CY himself admits it's wrong!
Thanks
Keith

[Paulice]

yea start from the beginning and set everything again, but also set your throttle curves so the heli fly's without the gov then make sure in Idle 1 & 2 that the led is on all the time, only in normal mode it should go off at the 30%+/- throttle stick position, & hold off all positions of the stick.

so in Idle 1 & 2 make sure you have more than 40% at the lowest on the throttle curve.

[RotorBlade]

Thanks Paulice - I've got the low point set at 35% and the curves for ST-1 at 55-55-55-65-100 and ST-2 at 65-65-65-75-100.
Could the issue be insufficient power from the engine? Am I confusing headspeed/power - as in when you drive up a hill, a given roadspeed needs more power.
When I looped, the governor couldn't command enough power...
Or am I way off the mark?
Thanks again, Keith