FF7 Jumps between normal and idle up?

[Sesame]

ive just helped a mate set up his raptor and this weird jump in pitch is happening. he's using a Futaba FF7 and a pcm reciever.

we set up all the curves everything was going ok, and then I noticed this little jump, its dropping the pitch by about 1 Degree and then reverses when going back into normal. There is no change between idle up 1 an 2.

Ive been through all the transmitter settings but can't find anything that would be causing it, has anyone got any ideas?

[Raptormadsteve]

Hi Tony Is the jump on the heli? I'e mechanical rather than electrical
Maybe its the swash binding on the main shaft...... Just a thought!
Steve

[Disc]

Servo not centering right?

What servos are you using?

[Sesame]

its definately from the servo.

Yes I centered them all and ive check at mid point all the curves are 50 75 100%. Interestingly the throttle doesnt move its just the pitch.

As for servos i'm not sure what he has in there, I did look at the time butcant remember now, after all I have slept since then lol

[marktigere1]

The servo gear is okay ie. no missing teeth or damage?

[Jamez]

Are you sure there's no subtrim in there, it's easy to miss,Just a thought.

Are the top and bottom points the same when you switch between the 2, just another thought.

[Tripler]

B C T
if normal pitch is -5 0 +10
Idle 1 -10 0 +10

it will jump when switching because the pitch curves are different below mid stick,
try putting all P curves the same,

[Sesame]

nope no missing teeth and yes it is as though the pitch curves are set differently but above 50% they are all set the same.

nope no subtrims on the pitch again checked that, looks like were all thinking along similar lines, im glad to say.

another thing if I inhibit idle 1 and switch from normal into idle 2 it does the same. as I said before Im flumoxed, was hopeing someone would tell me of a known problem on the FF7 or something. but it obviously isn't gonna be that easy.

[Tripler]

Thinking!!

[Tripler]

End points the same?

[Sesame]

Yup

although we did change the endpoint on the throttle, hmmm, could this having an effect on the pitch?

[robgt]

Have you inhibited the hover pitch twisty knob thingumabob?
Cheers,
Rob

[Sesame]

I think so, but I will check that one, good thought

[moyesboy]

Willing to bet this is hovering pitch/hovering throttle.
you have to inhibit hovering pitch in the menus.

It only applies to normal mode, so you get a difference in normal comparesd to 1 and 2 (and t hold) even when all the curves are the same.

Hovering pitch nob is a pretty useless feature really.

[Jamez]

You haven't got pitch and throttle channels in the reciever the wrong way round, don't want it to come across like I am saying you are likely too, it was the next thing I would check.