Jazz 80-6-18 Programming Issue

[Skysurf]

I just got another Logo 500. Bought it second hand complete with motor and esc. When I tried to program it with the Prog Card, it wouldn't work. I understand that the Prog Card dosen't work with versions older than 7.5, is it possible to do an uppgrade?

Since I couldn't get program it using the card, I went ahead and did a mode one followed by a mode four. I then went out to fly it, and it act really strange. The spool up (at zero pitch) was not nice and smooth as my other one (default in mode 4 should be 12 seconds?). When I did a full power climb and the quickly backed off the throttle, the helicopter kept climbing (and I thaught that was it) but after maybe 1 second, it responded and started coming down again. I put it back on the ground, and it's not flying again untill i figur out what's going on...

Any ideas?

Thanks,

Jesper

[poerqwa]

Do you have a non-linear throttle curve?

Did you do the programming and first spool up with a linear curve to allow the Jazz to learn battery/motor characteristics? (you do not have to wait for a full spool up, 1 sec should do it)

Actually in order to go up/down you normally use your pitch curve(not the throttle). Sure that the pitchcurve is correct?

[Skysurf]

Hi,

Well, I did the programming with the throttle curve set to a straight line 0-100%. After I was done, I set the first point to zero and the rest to 57%. For the first spool up I flip the hold switch, set the throttle/collective lever to 50% (0 pitch) and relase the hold and let it spool up. I am missing something?

/Jesper

[BruceW]

Hi,

Well, I did the programming with the throttle curve set to a straight line 0-100%. After I was done, I set the first point to zero and the rest to 57%. For the first spool up I flip the hold switch, set the throttle/collective lever to 50% (0 pitch) and relase the hold and let it spool up. I am missing something?

/Jesper

What are your throttle curves for normal, idle1, idle 2? If your flying in governor mode, you should have flat curves in idle 1 and 2. The governor on the Jazz works best between 75-85%.

Mine are set as:
normal - 0, 75, 75, 75, 75
idle 1 - 80, 80, 80, 80, 80
idle 2 - 85, 85, 85, 85, 85

When you have governor mode programmed on the ESC, a changing throttle curve will have the delayed reaction you are describing. When I switch from idle 1 to idle 2, I hear a smooth transition for the increased head speed instead of a jump.

[fogger]

Your throttle curve should not have a zero for the first point, that could be your problem. Just use a straight curve all the way across, and use throttle hold to spool up. As good as the soft start is you have no need for a zero point on a jazz.

Also 57% is quite low, you might consider bumping that up or re-gearing so you can use a higher throttle percentage. Between 75 and 90 is what I shoot for personally.

-Fog

[Skysurf]

Bruce W,

My curves are similar to yours. ;) However, I only use one idle-up.

Normal: 0,57,57,57,57
Idle-up: 85,85,85,85,85

When I switch from normal to idle-up, it increased the rpm nice and smooth.

fogger,

I feel more comfortable having the first point set to 0, and I know that's not what's causing the problem because I have been using the same set-up with my other jazz 80-6-18.

Someone wrote that 57% is the lowest value that should be used with these controllers, it gives me around 1750 rpm for hovering. I use 85% in idle up, and that gives me about 2150-2200 rpm.

/Jesper

[fogger]

I see. Just for fun, try spooling up in idle up by setting your pitch to zero (should be mid stick if you are a 3d guy) and flip off throttle hold. Let us know if there is any difference. I'm assuming you have a linear pitch curve , + / - 13 or so degrees. Does your pitch slider move freely? Maybe there is some binding in the head setup somewhere...?

-Fog

[BruceW]

Fogger, I've found that the 0 for the first point on normal doesn't hurt anything either. Its not too different from flipping out of TH into idle and my head speed has been very consistent. The only time I've seen an issue is when I tried a battery that wasn't 100% and the governor didn't calibrate correctly and proceeded to run at a lower speed.

[Skysurf]

fogger,

That's pretty much what I am allready doing. My normal mode pitch curve is -5,0,10 with 0 degrees at mid stick. I hit hold, set the the collective to 0 degrees and flip the hold off to let the heli spool up.

/Jesper

[Mathias]

I am going to program my Jazz ESC very soon.

Can I set my curve in normal mode to 0-57-57-57-57 if I have used the prog card to get 6 sec. spool up time? Or would that make a very violent spool up which can cause main gear stripping etc?

[Skysurf]

That should work just fine. 6 seconds is not violent, it's still smooth.

/Jesper

[fogger]

Are you certain the mode 4 programming took? IE did it beep 4 times after you went high stick to confirm the setting? might review this thread on programming to double check that you did this right: (not saying you don't know what you are doing, but just to be thorough :))

http://helifreak.com/showthread.php?t=51581

Barring that (a jazz programming problem), I'm guessing that you have either a mechanical setup problem or a radio issue then, because you're apparently using the jazz correctly, and I've never heard of one screwing up like that...

Maybe more details about your setup would help.

-Fog

[Skysurf]

I have reprogrammed it a couple of times, because it seemed like it wasn't in the right mode. I followed OICU812's instructions and I got the four beeps...

The rest of the set-up I know is ok, I flew the same heli with the same radio set-up but with the other controller, and it worked great... It really sucks that the Progcard dosen't work with all firmware versions...

/Jesper

[fogger]

bummer bro, maybe you got a bad one or it doesn't like your motor ?

[Mathias]

That should work just fine. 6 seconds is not violent, it's still smooth.

/JesperOK, thanks. Just had to be sure.

The reason why I don't want to use the 12 sec. spool up is because if I want to abort an auto 12 seconds might not be fast enough...