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HomeRC & Power✈️Aircraft🚁Helicoptere-Electric Motors-Controllers-ESCOther › Jazz 40 need to re-learn the motor with bigger blades?
09-10-2006 08:00 AM  14 years ago
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xStatiCa

rrApprentice

New Port Richey, FL

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Jazz 40 need to re-learn the motor with bigger blades?
When the Jazz learns how to work with the motor(next turn on after mode 4 programming), does the load matter? If it detected the motor info with 290mm blades do I need to reset to mode 1 and then mode 4 again to learn how to compensate for the bigger 325mm blades I installed? Will the bigger blades affect the timing(and/or whatever else the Jazz learns about the motor to govern the RPM).

I am upgrading my mx400pro from the short boom and 290mm blades to the long boom and 325mm blades.
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09-10-2006 08:24 AM  14 years ago
FrittsLogic (RIP)

rrApprentice

Honolulu, Hawaii

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It relearns your motor characteristics each time its turned on. That's why the instructions tell you to let it spool up at zero pitch. If you let the spool up happen at different pitch each time(thus different load), you actually will notice a difference in the governed speed. So the short answer to your question is that the Jazz will automatically account for the bigger blades. I like to put throttle hold on, then set the collective to zero, then flip to idle 1, then release thr hold and wait for spool up to complete, then take off.We don't need no stinking flybars!
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09-15-2006 06:49 PM  14 years ago
xStatiCa

rrApprentice

New Port Richey, FL

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Wow. I have seen so much conflicting information about this it is crazy. It seems like everyone has their own ideas about how the Jazz works. Their english documentation is so good I don't see how this could happen (Joking).

I thought it only adjusted for the motor the first time it turned on after programming heli mode 4.

"The range of RPM selected by the slider is self adjusted by the Jazz. Its done when the motor is started for the first time after the battery is connected."

That is not very clear to me what first time means. First time after programming? "first time after the battery is connected" would seem to indicate that it does not happen the second time or why even say first time. That part of the sentence has to mean something.

To make it more clear to me anyway it should say this...

"The range of RPM selected by the slider is self adjusted by the Jazz. It is adjusted each time the motor is started after the battery is connected."

Ok so assuming it works as you suggest then I could do the following to start it up correctly...

normal pitch curve 50/50/50 (0/0/0 pitch)
normal throttle curve 0/62/62
idle-up pitch curve 0/50/100 (-10/0/+10 pitch)
idle-up throttle curve 62/62/62

Startup in normal mode and leave stick somewhere between mid and high stick until spoolup.
Bring stick to just above mid stick to keep governed RPM constant and pitch very low (+1 maybe).
Switch to idle-up.

If all this is true then the reason it has been working ok for me is probably because I always went to mid stick until the RPM stabilized in normal mode with a -3/0/+10 curve which kept the pitch very close to 0.

Have you found any other documentation that details precisely how the Jazz works or did you discover this on your own?
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09-15-2006 07:58 PM  14 years ago
FrittsLogic (RIP)

rrApprentice

Honolulu, Hawaii

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I've read other posts that, coupled with personal observations, that allowed to me to more properly interpret the poor english translation of the instructions. Your idea of the zero pith normal curve is intriguing. I do that when I first set the thr curve for the HS I want, but I ususually go back to a variable pitch curve when I'm done testing. What I do religiously is to take the collective stick to zero pitch (my 14mz reads out in degrees of pitch on the main screen) before releasing thr hold. I always wait for hs to stabilize before changing pitch. I know for a fact, that if I change pitch before spool up is complete, that the governed HS will not be what I want. I also know from experiments with my Lepton, that the governed speed is really like a governed voltage determined by the THR percentage and initial battery voltage seen by the ESC. With an emoli pack hooked up, my Lepton will spool up to 2500rpm in mode 4 at zero pitch. If I just replace it with a FP 3700 pack (higher voltage per cell) without changing anything else, it spools up to almost 2800. I'm going to swap out the Jazz 55 with a Jazz 80 and leave my thr curves as they are and see what happens. If it spools up to the same speeds, I'll know how the Jazz software determines governed speed.We don't need no stinking flybars!
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09-22-2006 01:56 AM  14 years ago
ShellDude

rrElite Veteran

East Coventry, PA

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bumped for the love all Jazz owners... I'm so confused.
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09-23-2006 09:39 PM  14 years ago
FrittsLogic (RIP)

rrApprentice

Honolulu, Hawaii

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So I swapped out to the Jazz 80 and left the THR curve as it was. It did not go to the same speed, so each model of Jazz does in fact calculate the governed speed(frequency) differently.We don't need no stinking flybars!
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