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Radio - Servo - Gyro - Gov - Batt > T9CP channel swap question
 
 
Yug
rrProfessor
Location: UK. Herts

I'm wanting to swap channels 3 and 6 so as to minimise latency for eCCPM, so the swash uses 1,2 & 3. I have not found a way of doing it with my early version of the transmitter. Does anyone know if the latest version facilitates this ?

The problem is causing me grief because of the extra correction required when entering rolls and stuff. For example, when entering a rolling circle, it's causing the tail to drop when going inverted so I'm having to add a whole lot of elevator on each cycle. My mCCPM machines are so easy to fly this sort of manouver compared to my XeroG.
02-28-2006 Over year old.
 
 
DenisS
Key Veteran
Location: Essex, UK

There is no way of doing it as there is no way to assign throttle to another channel, as the switches are all assigned-i.e. hold, idle up etc. The short answer is a no. You couldn't even do it with the ZAP, which is a lot more capable. You would have to splash out for a 14MZ, or the forthcoming 7MZ or 9MZ (whatever) You could put a programmable mix to help to some degree but it would always be a compromise with something else.
Sorry dude
Denis
PS it can depend on which direction you are rolling as to whether the tail drops or not, plus you may be able to adjust the phase angle slightly to reduce the effect.

Crash 'n Lurn
02-28-2006 Over year old.
 
 
Yug
rrProfessor
Location: UK. Herts

Quote 
PS it can depend on which direction you are rolling as to whether the tail drops or not, plus you may be able to adjust the phase angle slightly to reduce the effect.

- yes indeed.
I'm using a QuickUK hub so there's no control ever the phase angle.
I don't think I can afford a 14MZ, I think it's a complete ripoff.
I suppose one other solution is to use a separate mCCPM to eCCPM module.
The other solution may be to use a faster servo on the channel suffering the greatest latency, ie ch6.
ummmmmm, just dunno what's best to do.
02-28-2006 Over year old.
 
 
chuckhager
Key Veteran
Location: Clovis, CA

You've probably already done this, but I figured I'd post it just in case. And who knows, it may help someone else.

http://runryder.com/helicopter/t172857p1/
02-28-2006 Over year old.
HOMEPAGE  
 
 
Yug
rrProfessor
Location: UK. Herts

Yeap, I was very involved with that thread. Thanks anyway.
02-28-2006 Over year old.
 
 
chuckhager
Key Veteran
Location: Clovis, CA

Doh! It's been awhile since I've read that thread. I just noticed your name all over it. I should have known you had a big helping hand in that one.
02-28-2006 Over year old.
HOMEPAGE  
 
 
Yug
rrProfessor
Location: UK. Herts

The dreaded pull of the 14MZ gets stronger by the minute. Do you know if it can buddy upto a T9CP ? I was planning on getting a spare Tx in the near future anway. Just need to convince my wife
02-28-2006 Over year old.
 
 
DenisS
Key Veteran
Location: Essex, UK

The other option is the JR PCM 9X II. It has some great e-CCPM features including CCPM servo exponential. If you need PCM then you would have to get the JR receiver but it works with Futaba PPM receivers. I have just got one, I am a Futaba man and have had the ZAP, in one version or another , for 11 years but this is a good transmitter, 30 model memory with the ability to save to computer. Mode switchable, 140 degrre e-CCPM. As I said, could well be worth a look.
I still use my ZAP as my main radio but do like the 9X II.
(don't need a mortgage to buy it either)
Just a suggestion
Denis

Crash 'n Lurn
02-28-2006 Over year old.
 
 
Yugdab
Senior Heliman
Location: Bedfordshire, England

Is it a function of the tx that has the letancy or is it the rx?

As the curves are programmable could you not just swap the servos over on the rx?

Okay so throttle hold might be a problem but is it a goer?

If things don't change... they'll stay as they are!
02-28-2006 Over year old.
 
 
RappyTappy
Elite Veteran
Location: Las Vegas, NV

That latency stuff is cool, but in real world flying, IMO, I don't think it really hinders anyone, more mentally I guess in thinking that now the 9C is inferior or something.

Chris
Rex 500 A123 Power

Forever Brothers
Mickey Tylo
02-28-2006 Over year old.
HOMEPAGE  
 
 
TMoore
rrProfessor
Location: Cookeville, TN

Quote 
I'm wanting to swap channels 3 and 6 so as to minimise latency for eCCPM, so the swash uses 1,2 & 3. I have not found a way of doing it with my early version of the transmitter. Does anyone know if the latest version facilitates this ?

The problem is causing me grief because of the extra correction required when entering rolls and stuff. For example, when entering a rolling circle, it's causing the tail to drop when going inverted so I'm having to add a whole lot of elevator on each cycle. My mCCPM machines are so easy to fly this sort of manouver compared to my XeroG.


Just jack the sticks up, slide a nice Stylus or 12Z in underneath and you'll be a happy man.

TM
02-28-2006 Over year old.
 
 
Yug
rrProfessor
Location: UK. Herts

RappyTappy - I disgree. I'm no hotshot flyer, but the effects of latency on an eCCPM system mean I have to fly it completely differently from mCCPM. The corrections and timing are very different.
My mCCPM machine is fairly symmetrical to fly barring tail wash compensation, while my eCCPM machine needs appropriate corrections to counteract the servos that are responding late. I am loathed to give up flying eCCPM because both systems have their merits and I love my XeroG because its such tremendous heli. This is why i've got a bee in my bonnet with this blasted latency issue. The one area that seems OK is with piro moves because everything is normalised on each rev, so at least one element is dialed out.
02-28-2006 Over year old.
 
 
Yug
rrProfessor
Location: UK. Herts

Yugdab - I tried swapping, but with predictable results. eCCPM relies on channels 1,2,and 6, 6 is the problem which ever way you look at it.
02-28-2006 Over year old.
 
 
chuckhager
Key Veteran
Location: Clovis, CA

So is it due to the geometry of the XeroG design? I saw where someone put a servo wheel up where the elevator bellcrank was located to correct for this.
02-28-2006 Over year old.
HOMEPAGE  
 
 
RappyTappy
Elite Veteran
Location: Las Vegas, NV

I've seen 9C's function perfectly on CCPM before, it's all in setup.

Chris
Rex 500 A123 Power

Forever Brothers
Mickey Tylo
02-28-2006 Over year old.
HOMEPAGE  
 
 
Yug
rrProfessor
Location: UK. Herts

Well maybe. I really don't know what to try next. Stuff like swash interaction is all dialled out. Did it with a laser on the swash; climbouts and inverted climb outs are OK. Balance is perfect. There is a little play on the antirotation swash link as well as the washout hub pins but only a bit. All links are perfect. oh well, time for a large brandy and BIG ponder. Thanks for help.
02-28-2006 Over year old.
 
 
fritzthecat
Key Veteran
Location: New Orleans

If the 14MZ Ripoff Tx is too much, have you looked into the Airtronics Stylus. It's ECCPM latency is on the same level as the 14MZ.
See here:
http://www.runryder.com/helicopter/t172571p1/

You can also see that PPM has much less latency so you couls try a FM Rx in your heli just for kicks.

Fritz


'Send Money, Women and Guns!'
02-28-2006 Over year old.
 
 
TMoore
rrProfessor
Location: Cookeville, TN

Guy,

If you have access to a Sanwa RD 8000 it will work as well on PCM. It doesn't have the adjustability of the Stylus but the swash will go straight up and down.

TM
02-28-2006 Over year old.
 
 
DOKEY
rrProfessor
Location: Northampton UK

Quote 
So is it due to the geometry of the XeroG design? I saw where someone put a servo wheel up where the elevator bellcrank was located to correct for this.


This one ? G.mans pic
Flying this setup to mine (stock) I did not see a great deal off improvement to be honest

Check the gallery!
02-28-2006 Over year old.
HOMEPAGE  
 
 
Yug
rrProfessor
Location: UK. Herts

hmmmmm, PPM. Perhaps that would be well worth checking out before parting with loads of dosh on a different radio. thanks.

Geometry - don't think so because I use a laser on the swash to check for interaction and the only time I see interaction is when I am changing the collective, then it settles down. So, it aint a static - geometry issue, its a time related dynamic issue.
Lets say I align the laser to observe only elevator input, and I then apply just aeleron input, the laser dot initally moves as the servos are moving then settles correctly. The movement I'm seeing is due to the latency. The laser dot hits a wall about 7 feet away and it moves around by a few inches.
Back to my brandy
02-28-2006 Over year old.
 
 
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Radio - Servo - Gyro - Gov - Batt > T9CP channel swap question
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