Five cells and 2700mAh pencils out to being about right.

Your mileage may vary -- but you should be averaging about 450 watts for the flight, and for five minutes in the air that should use about 75% of your total battery capacity.

Based on everything I've read here, it's probably a good idea to just get one or two packs, try them out, and then decide if you want more of the same or if you need something a bit bigger.

Five cells and 2700mAh pencils out to being about right.

Your mileage may vary -- but you should be averaging about 450 watts for the flight, and for five minutes in the air that should use about 75% of your total battery capacity.

Based on everything I've read here, it's probably a good idea to just get one or two packs, try them out, and then decide if you want more of the same or if you need something a bit bigger.

Dear Tim

Thank you for answer

I have 4 packs   5S 2700 Mha
I decided to use this setup because I saw a lot of people using in Stunt news .
I will try 9400 rpm check if is possible to arrive in 5 minutes

thank you

guil

I haven't used APC's for a couple of years and can't remember the rpms.  It will be less for 5.5P than for the 3.4P so just dial in the lap time you want.  The 12 x 6 didn't work at all for me.  All airplanes are different, use the one that works best for you!  Also, lap times will vary with weather, altitude and other things.  Don't be afraid to mess with stuff!

I usually run about 5.3 to 5.4 sec/lap on .018 dia. 69.5' lines handle to CL of airplane, 5 min. 20sec. total flight time not including 30sec. delay to begin.  Battery use was 70% to 80% sometime less depending on air conditions.  I use three blade props now and the consumption is up but so is the performance.

When I was using the APC 13x4.5 the rpm was about 9400.
The 13x5.5 was about 9200.
Lap times around 5.4/lap.

Line length from 64 to 66 foot (eye to eye) for a 60" plane is about right.

Mr Russel

Is possível tô do a 5 30 sec with a 5S 2700 Battery?

Thank you

Guilherme Souza (Guil)
(Mamão) Tremembé Brazil

Guil,
You should set your timer for a short flight (2-3/4 minutes?) and then measure the charge you put back into the batteries.
This will tell you the power consumption, as long as you perform maneuvers normally for the first two minutes or so.
Then you can estimate if you are going to use too much capacity at the full 5-1/3 minutes.
You should be able to safely run your batteries if a normal pattern consumes 2200 mAh or less.
This will avoid the risk of discharging a battery too far and ruining it.

Regards,
 Dean P.

Hi Guilherme:

I have been flying an electric Legacy for about 3 years. Motor is OS 3825, 750 KV, 5-cell 3000 mAh batteries, FM9 timer, Castle Phoenix ESC. I have had best results with APC 12-6 EP (reverse rotation) prop. I have tried the APC 13-4.5 but prefer the 12-6. My model weighs 64 oz. ready to fly, about the same as yours. Lines are about 65 feet handle to center of model, about 19.8m. I set it for 5.4 second lap times. This setup uses about 1800-1900 ma for a 6-minute flight, so the 2700 mAh batteries should be fine and leave you with plenty of reserve capacity. Your setup sounds very similar to mine, though I don't know what KV rating your E-32 has.

I suggest you set the timer for at least 6 minutes since 5 minutes is not enough to complete the pattern and have any cushion of safety. My timer is set for 6 mins 20 seconds, and I still have plenty of reserve power in the battery at the end of the flight, plus can do a few outside loops to unwind the lines before landing.

This is my flight

As Mike says, if the plane feels good all you need is more handle time and a good judge/coach.