6 cells vs 7 cells flying time

DarrenT · Feb 09, 2003, 06:47 AM

I have a Coyote and Astra Spitfire and am about to upgrade my battery pack. From posts I have read I am keen on the HR-4/5AUP cells. Motocalc gives me an indication of the relative flying time difference between 6 and 7 cells, but I would like to know if, because I am using a BEC, 7 cells will additional flying time (i.e. 6 cells are have a lower voltage to start with and are therefore going to cut out sooner?). I guess what I am asking is does anyone know if Motocalc allows for a BEC and its cut-off voltage?

I would prefer to go 7 cells, but it is a squeeze in the Coyote.

Thanks

Andy W · Feb 09, 2003, 08:44 AM

How do you fly?
If you're at full power most of the flight, 7 cells will give you higher current, which translates into LESS flight time, as you're at the same capacity. It will be faster, thought.
If you're in the habit of carefully controlling throttle, you can get more flight time, however, as you now need less throttle (hence less current) for the same power output to maintain flight.
If you're hitting LVC cutout well before the cells are discharged because of the low cell count now, however, 7 cells will make a big difference.
..a

Feb 09, 2003, 06:47 AM	#1
DarrenT Registered User Join Date: Dec 2002 Location: Adelaide, Australia Posts: 26	6 cells vs 7 cells flying time I have a Coyote and Astra Spitfire and am about to upgrade my battery pack. From posts I have read I am keen on the HR-4/5AUP cells. Motocalc gives me an indication of the relative flying time difference between 6 and 7 cells, but I would like to know if, because I am using a BEC, 7 cells will additional flying time (i.e. 6 cells are have a lower voltage to start with and are therefore going to cut out sooner?). I guess what I am asking is does anyone know if Motocalc allows for a BEC and its cut-off voltage? I would prefer to go 7 cells, but it is a squeeze in the Coyote. Thanks

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Feb 09, 2003, 08:44 AM	#2
Andy W That sickening crunch.. Join Date: Jun 1999 Location: Marietta, GA Posts: 39,779	How do you fly? If you're at full power most of the flight, 7 cells will give you higher current, which translates into LESS flight time, as you're at the same capacity. It will be faster, thought. If you're in the habit of carefully controlling throttle, you can get more flight time, however, as you now need less throttle (hence less current) for the same power output to maintain flight. If you're hitting LVC cutout well before the cells are discharged because of the low cell count now, however, 7 cells will make a big difference. ..a