Batterys and ESCs

[Flybar-less]

I have been flying the Logo 600 3D with Flight Power 4350 25C 10S and 5350 17C 10S packs, using CC HV 85s, a CC HV110, and a Power Jazz. The 3 CCs all died, but they adapted to the different batterys better then the PJ. The CCs held the same RPM with either battery, the PJ does not.

Either battery will spin the rotors faster then needed (2,500 w/ 13T), the 25C wins in power output, my choice for drag races.

Not really a problem, I may set up a different model in the TX with a different Gov % for the 2 different packs, or just use different idle ups.

The weight difference between the 2 batteries inflight is barely noticeable, runtime difference is, 5 minutes vs. 7.

[LITHIUMSTATIC]

I've been running 10s 3700 25C packs. I would like to move to the 4350 packs as I feel it must be a good balance between flight time, power and weight.

[th3tick]

OICU812 suggested reprogramming the Jazz back to mode 1 then 4 to reset it when switching packs. It would be GREAT data to have to see if this gets your RPM inconsistency resolved.

I realize this isn't practical long-term, but understanding if that helps would be very useful.

John

[Flybar-less]

John,
The Power Jazz does not have modes, it has to be programmed with the card and extra cables. I am setting an Idle Up with a different gov setting for now.

[th3tick]

Ah, sorry. I forgot you were on that one.

[Mercuriell]

I've been running 10s 3700 25C packs. I would like to move to the 4350 packs as I feel it must be a good balance between flight time, power and weight.

I have FP 3700 FP 3300 and an AT 500 pack (all 10S) - I haven't noted ,uch difference between duration between the 3300 and 3750 (maybe weight cancels out endurance) - tried the 5000 pack pnce and it felt like a T600 with leaed skids - haven't tried it again - thought I'd save it for a T600 10S !! - so I guess my fave pack is still the FP 20C(!) 3300 !!

[MrMel]

RJohn,

are you using the PJ in Fixed Throttle endpoints mode or APM mode?

[Flybar-less]

Fixed throttle

[MrMel]

According to Kontronik (I spoke to them about this a while back) the Powerjazz governor determine its RPM range from voltage when its connected.

This differs from CC as you have noticed since their range is more "fixed".

How much difference in the resting voltage do you have on the pack you describe?

I get the same effect if I take a fresh battery, run it for 30 seconds, then unplug/plug it in again, then I get a totally new RPM range...

[Flybar-less]

The packs were charged to the same exact voltage the night before, 4.2 +- 0.05V.
That may also explain why I had a shorter runtime with what I thought was a "hot" pack. How about controller temp when connecting?

[MrMel]

Yes, charged to the same voltage, but after the charge let it rest 20 minutes, and check the voltage, it will back down, question is if it does more so on one of the pack or not. That could explain it.

Dont know about temp on the controller, mine never got even warm :)

[Flybar-less]

I'll test it.
Thanks,

[Flybar-less]

Well I lowereed my gov setting in Idle-up 1 and added a mix to my radio so I can add 5% to the gov setting with the flick of a switch. I usually fly at lunch so I take batteries pre-charged to the field, fly then leave. I could add a mix that could take away or add to the initial startup rpm according to the voltage the Power Jazz sees, if I wanted to get more eleaborate.

It is a little suprising when you put in a battery and the headspeed screams.

[Flybar-less]

I now have abot 30 flights on the Power Jazz, it holds rpm well during flight but is not consisent between flights. This never happened with the CC controllers, but they didn't last either. I flew 3 flights again with batteries topped off immediately prior to flying. A 4350 and 5350 produced the same RPM, another 4350 is 5% over in gov mode.

[MrMel]

I flew 3 flights again with batteries topped off immediately prior to flying

How long between charging and flights, just a minute or so and the voltage will drop, it really depends on the quality of the cells, you need to use a DVM and check real numbers.

[Flybar-less]

2 to 3 minutes at best. The voltages were checked with a TP 210V wich reads the same as my DVM.

[Ticidytoc]

This never happened with the CC controllers, but they didn't last either.Kept popping the controllers? Did you do anything to address the static issue?

[Flybar-less]

Kept popping the controllers? Did you do anything to address the static issue?
Static, metal idler w/ bleed bonded to boom. Triflow. I am currently running a special boom without anodizing inside. Nothing in the front yet. Am having the forward belt pullys made in aluminum. Any other ideas for protecing the controller?

seepicin topic:Need some expert Logo 600 3D advise please

[cptsnoopy]

The guy I have been in contact at SAE just sent an email saying that their new version of the SD-85N is going into testing phase and they hope to have it out soon. I have never had a problem from static with that controller and most of my experience using it has been on 12s using it between 2500 and 4000 watt peaks. I also ran it on a 9lbs P-51 but it melted down after the motor shorted out from too much current. It did fly great in the meantime though! It has a great gov and it has only been on the 600 3D using a Hitec 6965 tail servo and 92mm NHP tail blades that I had any issue with the tail fighting the controller. Instead of spending any time adjusting parameters in V-stabi to clear up the tail wag, I just went to heli-mode without gov and that is working well also. I have not used a CC controller in quite awhile because of all the issues with them dying when trying to get them to run on 12s.