Originally Posted by Aeroplayin

I'm guessing the volts you displayed above are the volts off the charger on the 6S right? Obviously the Watts and Amps don't agree with 4.217v per cell.

Anyway, if I use the Watts / Amps to get the volts, we end up with the following:

Castle data log 8Hz:
110A
2503W
22.75v
74.64% KvE
6283 RPMs

Castle data log 16Hz:
108A
2444W
22.63v
74.39% KvE
6229 RPMs

Castle Ice 100 + Inline:
88A
2000W
22.72v
68.21% KvE
5734 RPMs

ZTW:
100A
2250W
22.50v
72.41% KvE
6028 RPMs

We can find out which one it tell the truth by getting an RPM reading. If you can do that again with RPM's we'll know for sure. I'm going to guess that on a full charge, the Hacker will deliver over 6000 RPM's with the 21x10 Xoar if the battery can hold at least 3.75v per cell. That's 102A so the readings you show for the ZTW is what I would expect from the setup, and what I'm hoping for, but if the Castle is providing more RPMs, then there's more power at the top end.

Aero, all thei info for the Cadtle was taken from the data log. I know the volts don't calculate right but why is it showing that?

Originally Posted by Balsa Breaker

Aero, all thei info for the Cadtle was taken from the data log. I know the volts don't calculate right but why is it showing that?

Not sure yet. I have the Quick Connect set up to download data from Tom's Q80-7M and HV160, and have Parallels on my Macbook, but have not done it yet. The only thing I'm concerned with now is the temps of each component, the volts per cell when he's done with a flight, and the capacity we put back into each discharged battery.

The main thing with motor data is that volts, Amps, and RPMs, tells the complete story and we can't go by your volt reading and we don't have RPMs. Additionally, I'm not sure 88A and a 68% Kv efficiency is possible with this setup. If it is, I'll be very disappointed. I would be surprised if you were getting less than 6200 RPMs at anything near 22.7 volts. Even the 21 inch prop should spin up pretty well on that 28 pole motor.

Originally Posted by Balsa Breaker

I know the volts don't calculate right but why is it showing that?

That's because the log reports peak figures for each variable, but they don't all occur at the same time. The volt peak would have been recorded after you power up but before the motor starts. The watts and amp peaks occur when you go to WOT.

To find out coincident figures hold the mouse pointer at the peak amps position and read off the voltage figure displayed in the 'mouse' row.

Steve

I just went the Hacker USA Web site and they have an example of the 20x11 APC setup at 22.2v and 100A for 2220 Watts. I'm going to have to challenge the 7400 RPMs they list there. I'm guessing it's a typo because there is no way you are going to get only 2220 Watts-in from a 20x11 prop spinning 7400 RPMs on 22.2v. I'm guessing it should say 6400 RPMs. I just sent Mike an email so we'll know soon.

I just checked again today with ZTW set to 8Hz. Battery fully charged.

After 5 sec, 2100 watts, 22.2V, 92amps. With a 21X 10

Originally Posted by Balsa Breaker

I just checked again today with ZTW set to 8Hz. Battery fully charged.

After 5 sec, 2100 watts, 22.2V, 92amps. With a 21X 10

Yeah, that's more like it even though the numbers still don't match up. 2100W, 94.6A, at 22.2v if the volts reading is correct and 2042W if the volts and Amps are correct.

That's a low KvE for this motor at only 5880 RPMs. I would immediately try a 20x10e Mejzlik or Falcon and certainly a 20x11e APC or 20x11e Mejzlik.

Tom flight tested the Xoar PJN 24x10 against the Mejzlik 24x10TH and he said there was no real comparison... the Mejzlik is back on the plane. Freakin' expensive though.

Yeah... the CF prop is mo-bettah! Plus it looks cooler. The Xoar was pretty much doing nothing. In comparison to the CF prop, it had nothing. It made a bunch of noise like it was just churning the air and just felt loose. I towed the plane back to the pits and went to the toolbox and started changing props before I even checked the batteries post-flight.

--Tom K.

Originally Posted by Aeroplayin

Yeah, that's more like it even though the numbers still don't match up. 2100W, 94.6A, at 22.2v if the volts reading is correct and 2042W if the volts and Amps are correct.

That's a low KvE for this motor at only 5880 RPMs. I would immediately try a 20x10e Mejzlik or Falcon and certainly a 20x11e APC or 20x11e Mejzlik.

Tom flight tested the Xoar PJN 24x10 against the Mejzlik 24x10TH and he said there was no real comparison... the Mejzlik is back on the plane. Freakin' expensive though.

The motor is 370 Kv , I might try this on 8S and a 19 X 8

What are people getting off the 5320 on 6S?

It looked like Herc really liked the 70 on 7S. I'm pretty sure that powerlines is on the 380Kv Motrolfly on 6S too and seems to love it flying a lot of hovers, harriers, elevators, etc. 2100 Watts is 225 Watts per pound since you should be at 9.25 to 9.50 pounds with the 6S setup. Are you saying that this is not enough power on the 21 inch prop? Do you fly low and slow 3D or do you like high-speed flight more?

The extra 10Kv is about 175 RPMs at the top end but I don't think Ken recommends more than the 19x10 on the 4325. You may be on to something with the 5320... 19x8 on 8S and 2800W.

Another question... do you have HV servos in that thing? If so, I'd run a separate 3s 1000mah batt with a CC BEC PRO. That could easily be why you're not getting the 2300W I would expect from this setup. It's another $40 with the 3S battery but cheaper than spending another $200 for a new motor plus the cost of a whole new set of 4S batteries.

A60-6XS V2
CC ICE2 100
CC BEC PRO
Xoar 21x10 PJN
6s 5000mah 40c Sky
3s 1000mah 30c Sky

Originally Posted by Aeroplayin

Another question... do you have HV servos in that thing? If so, I'd run a separate 3s 1000mah batt with a CC BEC PRO. That could easily be why you're not getting the 2300W I would expect from this setup. It's another $40 with the 3S battery but cheaper than spending another $200 for a new motor plus the cost of a whole new set of 4S batteries.

A60-6XS V2
CC ICE2 100
CC BEC PRO
Xoar 21x10 PJN
6s 5000mah 40c Sky
3s 1000mah 30c Sky

I am not running HV servos and I am running a BEC pro but off the flight battery. I just feel like its a little lacking of power plus the motor gets hot. I just added some baffling on the recommendation of Joe Smith so we will see if it helps. I've really been thinking about 7S but just don't want to buy all new batteries. Question, could I run a 4S and 3S but with different mah ratings just to see if I like it? Would you just base the flight time off of the lower capacity battery?

I match up brands, mAh, and C rating, when using multiple batteries with no exception.

Originally Posted by Aeroplayin

I match up brands, mAh, and C rating, when using multiple batteries with no exception.

Ok but do you think it would hurt if I had two with the same C rating and same brand just to try a 2 min flight? Just different capacity, I don't know what that could hurt.

Originally Posted by Balsa Breaker

Ok but do you think it would hurt if I had two with the same C rating and same brand just to try a 2 min flight? Just different capacity, I don't know what that could hurt.

You have to remember that the amp draw will be equal across both batteries. Its not shared and halved, ie, 100A series connection will pull 100A out of BOTH packs.

As long as the smaller of the packs can handle the total amp load without going 'POP' it should be OK.

You flight time will of course be limited by the weaker, smaller battery.

Originally Posted by bigroger

You have to remember that the amp draw will be equal across both batteries. Its not shared and halved, ie, 100A series connection will pull 100A out of BOTH packs.

As long as the smaller of the packs can handle the total amp load without going 'POP' it should be OK.

You flight time will of course be limited by the weaker, smaller battery.

See this is where I get confused. Let's say I have a 4S 4000 and a 3S 2650 both 25c. At 100 amps 2100 watts the small battery should be ok but only for a short time. It would only need 21C, correct?