Back to 10S, for a brief moment.

[PDC]

My new Schulze went up in smoke yesterday when I connected the battery, don't know why, but will send it for repair.

While I am waiting for it to be repaired / the new Kontronic power Jazz to arrive, what ever comes first, I am back on 10S and 50T with my good old Hacker/Jeti 77 controller.

Was out today and got 5 flights with my very old Irate battery which have close to 200 cycles. Funny to try this setup again, and even that the batteries are very tired, they got a little comeback with the NEU motor instead of the Hacker.
A bit rough softstart with this controller, had to tighten the main blades a little.

Made a new Tronic 10S 6000ma 20C battery tonight that I will test tomorrow with the NEU 1521-1.5Y motor and a 50T gear....will be interesting to compare it to my 12S setup.

From the performance with my very old Irate battery today, I do expect a good performance with the Tronic battery.

[lukedodd]

[quote="PDC"]My new Schulze went up in smoke yesterday when I connected the battery, don't know why, but will send it for repair.

I have the same controller to test 12s setup V14, it says it will take 14s V input. Haven't used it yet.

Did you experience sparking when connecting the battery to the ESC?

I use as Schulze 32.80KA with a 10s setup. So far its going great. I like the slow ramp up.

After a Previous Post on sparking, I made a preliminary connection lead with 56 Ohm 1 watt resitor to make the initial connection of the positive lead from my battery pack to my esc. ESC boots up as per usual with no sparking. When I plug the main power lead from the battery pack, no sparking at all. It is an easy to make lead using 2mm gold connectors. Females soldered on the ESC and pack positive lead with two male leads 2 mm silcon wire with the resistor inbetween as the initial connection lead.

LD

[PDC]

Thanks for the info lukedodd. And yes! It is always written that sparks can be harmful to the controller, just never had any problems with it except from the the burned plugs there have to be changed with fixed intervals.

Hard to believe that the sparks can kill this controller after a limited amount of flights. Will wait for what Schulze have to say, haven't got any reply on my email yet, but will send the controller to them so they can have a closer look at it. Schulze´s policy is that people should simply change the plugs with fixed intervals, and then do nothing else to avoid the sparks.....looking forward to the spark free Power Jazz controller from Kontronic.

Was out again today and got some flights with my new Tronic 10S 6000ma 20C battery......and it will be rebuild to a 12S battery ;-). But
good to try 10S again when I now are used to 12S power on both my Joker 2 and this Ion-X.

No doubt in my mind that 12S is a good cell count for big heli´s.

I know that with my 10S battery I had only 30 cells to do the same job as the 36 cells in my 12S battery, but the difference was bigger than these 6 missing cells.

On the ground with 0 pitch you can have the same head-speed with 10S and 12S, but as soon you lift the ship off the ground, the difference becomes clear.

With 12S on this heli you have:

- app. 20% higher gear ratio = more torque from the gearbox.
- 20% higher motor speed = further more energy stored in the motor, and more HP available at 48.000 rpm than at 40.000 rpm motor speed.

How much all this add up to in increased torque/power available for the same cell count just configured as 12S, I don´t know.

Dropped rpm during maneuver's are regained quicker with the more powerful high torque 12S setup, this in combination with a lot fewer rpm to regain with a 12S setup gives a system there not only gives close to constant rpm during maneuver's, but also gives a very little rpm drop from start to end of flight.

At the bottom line a 12S heli is a more powerful heli which gives more options and more fun, a better controlled heli which gives an easier heli to fly, no situations where the rpm drop during extreme maneuver's dropped to a level where the heli becomes more or less uncontrollable, etc. etc.

On top of that I would guess a high voltage system is more energy efficient, hard to prove for me, but that is what I feel when I listen to how the motor works with 10 and 12S. Under all circumstances I will always prefer to have high Volts and low amps through my cables and connectors.

Anybody who knows something about the aerodynamics of V-Blades?...and what about drag from blades in a 10S system dropping from 1900 rpm to 1600 rpm under load giving high angle´s of attach compared to blades in a 12S system cutting the air in small slices around 1900-2000 rpm constant, which again might open op for a more efficient blade profile designed for systems able to keep a constant high rotor rpm.

Also today I changed my setup in my Joker 2, with higher rpm setting from the controller, and lower gearing...end result was that the motor temp dropped from 100 deg C to 80 deg. C for the same work, eg. same rotor rpm, and same flying....that tells me that this self-cooling Actro motor might prefer to do the same work at higher rpm in combination with a lower gearing.

Anybody in doubt that I like high voltage setup´s :mrgreen:

[lukedodd]

Anybody in doubt that I like high voltage setup´s :mrgreen:[/quote]

I agree, after all P=VI, so if V goes up the current (I) goes down for the same power, always a good thing for efficiency etc.

My Schulze 32.80KA mentioned earlier originally purchased for plank F3A suddenly stopped working 20 seconds into its first test run! I was using well proven batts, prop, motor etc on a Hacker controller previously. Anyway Schulze fixed it up after a lengthy argument about battery lead lengths. The fault turned out to be be a few defective Mosfets in the ESC. Anyway I was about to give up on Schulze ESC's when I tried the 32.80KA in my Ion and its been going well since it was repaired. Logged 40 flights to date.

With the price of a 40.160 I hope mine goes OK, it will be a month before I test the Higher V setup, I am waiting on some 6s1p EVO's.

But agree with you entirely re higher voltage.

LD