RunRyder RC
 3  Topic Subscribe
WATCH  1 page 353 views POST REPLY
Thunder Power RC ProModeler
Jabber

Heliman

Hong Kong

My Posts: All  Forum  Topic

I have been playing around with the functions on my 18SZ, as one does, and had the condition delay pointed out to me. Basically I use this on going fron idle up 1 to 2 to try and smooth out the flight path by slowing down the throttle increase. So far so good.

I then though that, if I use this same function on the pitch channel I could time it so the pitch decreases from hovering to thrashing about setting, whilst the head speed increases in a gentlemanly manner, so all is smooth. This is where it went wrong.

When I switched to idle up 2 the Heli would leap up a few feet and then carry on. It would do this regardless of the time set. Whilst looking at it on the ground, I could see that, when the switch was pressed, the pitch would immediately increase by a couple of degrees or so, then slowly go down to the correct idle up 2 setting. It made it worse than not using pitch delay at all.

Does anybody have any ideas? What am I doing wrong?

08-16-2016 06:04 AM
PM  EMAIL  Attn:RR
modtron

Key Veteran

Oxford. UK

My Posts: All  Forum  Topic

The condition delay is generally used fo make the transition of the trim value settings smoother when selecting different flight conditions.

modtron
Oxford UK

08-16-2016 03:59 PM
PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
Jabber

Heliman

Hong Kong

My Posts: All  Forum  Topic

No idea what that means, sorry! With a CGY 750 there are no trims, all I have on condition change on the tranny is the change from one pitch setting to another. I get a 'pitch twitch' for want of a better description, so am I expecting the radio to do something that it is not supposed to do, or am I missing something?

08-16-2016 04:12 PM
PM  EMAIL  Attn:RR
modtron

Key Veteran

Oxford. UK

My Posts: All  Forum  Topic

Agreed, with the 750, no trim to change.

Take a look at page 153 of the manual - that will show you what you want to do to stop the pitch jumping when changing flight conditions - adjust the in and out speed for each condition.

modtron
Oxford UK

08-16-2016 04:56 PM
PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

It's odd the delay function is behaving that way. I've used it exactly as you describe since the days of the 14MZ because I hover at half stick and use a mirror curve for aeros. I even apply it on my throttle to further fine tune the transitions between head different speeds using my JivePro's governor.

Let's say you have a test pitch curve at 50% at half stick and another at 75% at half stick. First confirm the servos move exactly as expected with no delays in place when you switch between flight conditions. Make sure the delay is set for the condition you're entering. Next add some delay. When you see the odd behavior, take a little video of what the model is doing and of the servo monitor screen. Also make sure no pitch trims are active. I'd like to see what this thing is doing.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

08-17-2016 02:35 AM
PM  EMAIL  GALLERY  Attn:RR
Jabber

Heliman

Hong Kong

My Posts: All  Forum  Topic

Just been playing, took all condition delay timing off, used idle up 1 at -100 to 0 to 100 and offset this so the mid point was at +50 for idle up 2. There is still a twitch going from idle up 1 to 2, but it is very quick. Using condition delay on idle up 2 pitch it became much more noticeable.

This was not observable on the servo monitor. I have another model with similar electronics and will try it out on that one, see if it does the same. Not sure how to get recording from my phone to the message so cannot show you.

08-17-2016 02:05 PM
PM  EMAIL  Attn:RR
Jabber

Heliman

Hong Kong

My Posts: All  Forum  Topic

Tried another Heli with 7003/cgy750 and there is no twitch. Must be either a setting issue or faulty parts.

08-17-2016 02:30 PM
PM  EMAIL  Attn:RR
Jabber

Heliman

Hong Kong

My Posts: All  Forum  Topic

Found that if I set the same pitch rate in C1 and C2, the twitch goes away. Doesn't make sense though, unless the CGY750 is faulty or there is another setting conflicting.

08-19-2016 12:30 AM
PM  EMAIL  Attn:RR
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

Just keep the pitch rates the same and tune the curves when less is needed in the radio.

The reason it jumps is because the bank switching does not see the transmitter delay. The bank switching all occurs in the 750. You can't apply a transmitter delay to the digital channel that switches the banks.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

08-19-2016 12:35 AM
PM  EMAIL  GALLERY  Attn:RR
Jabber

Heliman

Hong Kong

My Posts: All  Forum  Topic

Hi Ben, I still got the twitch when I took the delays out. it is something to do with the CGY pitch rate in the 2 conditions, or banks, that is causing this.

08-19-2016 05:24 AM
PM  EMAIL  Attn:RR
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

I know. As long as you have different pitch rates in the two banks, it is going to jump when you switch between those two banks. You don't need different pitch rates in the two banks. Match them and adjust as needed in the transmitter.

Try this. Set two flight conditions that use one bank for one and one for the other. Both have zero degrees at half stick. One has 60% pitch rate; the other has 50% pitch rate. Set the collective stick at half stick and tell me if the jump occurs when you switch conditions.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

08-19-2016 12:55 PM
PM  EMAIL  GALLERY  Attn:RR
WATCH  1 page 353 views POST REPLY
Scorpion Power AlignRC
 Print TOPIC Advertisers 

 3  Topic Subscribe

Thursday, December 8 - 5:55 am - Copyright © 2000-2016 RunRyder   EMAILEnable Cookies