Over 10min flight time with 800Pro

[Rcbous]

Just maidened my 800 Pro today! What a beauty. I was running between 1650 and 1850 HS (normal and idle 1/2) and managed a 10minute flight time with batt voltage at 43V on landing (so I could have gone another 5minutes maybe?? 38.4v would be 3.2v /cell). I wouldn't have ever pushed it past 4 mins if I hadn't had telemetry on it showing live readings for flight pack and rx pack. Everyone one was saying 5mins max and only at really low head speed, I almost got discouraged.
Everything went great on the maiden, no tail wag, no oscillations, blade tracking was perfect. Thanks to everyone that helped answer my questions earlier this week

[Planehazza]

Nice although I'm a little concerned about the pack health and lifespan.

Could you tell us a little more about the setup? What motor and ESC, and about your flying style? What packs are you using and how many mAh are going back into them when charging?

Good to hear you're having so much fun with it and congratulations on the successful maiden flight!

[Alex Hawtin]

Glad it went well dude!

But like Harry say's I wouldn't push my cells that much, 3.7 is where I usually aim for (Around 20%) this means I'm hardly ever pushing the packs that much meaning the lifespan increases

[Rcbous]

Nice although I'm a little concerned about the pack health and lifespan.

Could you tell us a little more about the setup? What motor and ESC, and about your flying style? What packs are you using and how many mAh are going back into them when charging?

Good to hear you're having so much fun with it and congratulations on the successful maiden flight!

I'm running stock setup except the FBL unit.

850MX 490KV dominator motor
Castle edge 160HV esc
780 blades
BL800V cyclic servos, BL850H tail servo
AR7200BX FBL unit with TM1000 for telemetry just for rx & main pack voltages, and esc temp.
(You guys aren't going to like this) Turnigy 6s 5000mAh 40C (x2) ;44.4V
and Gens Ace 2s 2600mAh rx pack

i don't do hard 3D, some flips, tic tocs, hurricanes.. Today for the maiden I took it pretty easy. I was actually shaking a bit at first lol. I'm still pretty new to helis, 5months, but been flying rc planes for 7 years. And get lots of practice on Phoenix.

As for how many mA are going back into the during charge? My Triton charger goes up to 5Amps and I've been told to charge batteries at same current as mAh.. Is that what you are asking?

the batteries weren't puffy although I forgot to see how hot they were :$

Im going to download the data log from te CC esc and I can post it to show you guys later when I'm at a computer, that'll show current draw and other useful info you are probably curious about

[Rcbous]

Glad it went well dude!

But like Harry say's I wouldn't push my cells that much, 3.7 is where I usually aim for (Around 20%) this means I'm hardly ever pushing the packs that much meaning the lifespan increases

Thanks!
i landed at 43V which is just under 3.6v /cell (and that was under load, it went up a tad after I landed)
you think I shouldn't bring it down to 3.2v/cell?

[Planehazza]

I'm running stock setup except the FBL unit.

850MX 490KV dominator motor
Castle edge 160HV esc
780 blades
BL800V cyclic servos, BL850H tail servo
AR7200BX FBL unit with TM1000 for telemetry just for rx & main pack voltages, and esc temp.
(You guys aren't going to like this) Turnigy 6s 5000mAh 40C (x2) ;44.4V
and Gens Ace 2s 2600mAh rx pack

i don't do hard 3D, some flips, tic tocs, hurricanes.. Today for the maiden I took it pretty easy. I was actually shaking a bit at first lol. I'm still pretty new to helis, 5months, but been flying rc planes for 7 years. And get lots of practice on Phoenix.

As for how many mA are going back into the during charge? My Triton charger goes up to 5Amps and I've been told to charge batteries at same current as mAh.. Is that what you are asking?

the batteries weren't puffy although I forgot to see how hot they were :$

Im going to download the data log from te CC esc and I can post it to show you guys later when I'm at a computer, that'll show current draw and other useful info you are probably curious about

Thanks for the info. I just think that taking them to 3.2 is taking them too low, as don't forget that as soon as the load is taken off (ie batts unplugged) the voltage will rise back up slightly. By mAh back in, the charger should display how many mAh it has put into the pack as it is charging. This shouldn't exceed 80% of the capacity, ie you should not have to put more than 4000mAh into a 5000mAh pack. If that happens, it means you've discharged it too far when flying. 1% either way is fine, but technically speaking, even taking a pack down to 20% regularly will shorten its life, even though we all do it.

You're correct on the 5A charge rate. 5A on a 5000mAH (5Ah) is charging at 1C, which to be safe is correct. Most packs these days offer a 2,3 or even 5C charge rate, but as with discharging too far, it will shorten the lifespan if done regularly.

Nothing wrong with turnigy packs btw, cheap and cheerful. Unless you get a duff one and they can be a nightmare to resolve depending on where you buy them from!

Nice setup, enjoy!

[Rcbous]

Thanks for the info. I just think that taking them to 3.2 is taking them too low, as don't forget that as soon as the load is taken off (ie batts unplugged) the voltage will rise back up slightly. By mAh back in, the charger should display how many mAh it has put into the pack as it is charging. This shouldn't exceed 80% of the capacity, ie you should not have to put more than 4000mAh into a 5000mAh pack. If that happens, it means you've discharged it too far when flying. 1% either way is fine, but technically speaking, even taking a pack down to 20% regularly will shorten its life, even though we all do it.

So.... I charged the batteries and it put around 5800mA back into the 5000mAh battery...? Is that even possible.
I only discharged the pack to 3.6v/cell (43v on a 12s setup) so why is it bad when I didn't even take it past the voltage cutoff??

[jimmyhorns]

ouch.... it doesnt sound good.

depending on your charger the reliability of the mAh put back into the packs may be a bit 'iffy' but you will get some loss due to heat production and inefficiencies e.t.c

[338federal]

I fly 7-10 minutes. 1200-1800 rpm. Pack 3.7v/cell. Vbar control with current sensor. 30% left in pack and it is true when i charge it. I like the sensor.