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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Guilherme Souza on December 10, 2015, 07:12:57 AM
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Dear Sirs.
I need some help with EFLITE 32 in Legacy.
My model weight is 1850gr 61/63 Oz.
Im using EFLITE 32 FM9 timer 5S battery 2700 mah and 13x4.5 A PC Prop.
My lines are 18.5 meter.
With 8600 tem the lap time was 6.1 and with 9100 lá time is 5.9.
I Will increase the rpm útil arrive in 5.3
No I ask:
My battery o 2700 5S Will bê enough tô 5 minutes flor time?
Thank you
Guil
Enviado de meu SM-N7502 usando Tapatalk
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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.
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That is where I started out with my Sultan in the beginning. I switched to an APC 13 X 5.5, milage and performance improved.
Edit for SP MH
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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
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That is where I started out with my Sultan in the beginning. I switched to an APC 13 X 5.5, milage and performance improved.
Edit for SP MH
Dear Mike
What RPM are you using ?
And line size ? length
I have this prop too and 12x6
I would like to run this motor in better efficiency mode . what the efficiency rpm range ?
Thank you
Guil
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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.
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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.
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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
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I was using a 4 cell setup so my usage is different.
However, your plane is light so you will have plenty of battery left at the end of your flight using the 2700 battery.
I'd change the motor run to at least 5.5 minutes as 5 minutes will be too short to do the tricks and leave a few laps "up your sleeve" at the end of the flight.
The pilots over here use 2700mah (5 cell) batteries in their aircraft and some of their planes are closer to 70oz.
They have enough battery left after the flight so you will be ok. ;D
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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.
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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.
Mr Papas
Thank you for you answer.
I did the correct conversion and My plane is 65 oz.
Not só Light.
Tomorrow we Will have a small contest and I Will try tô fly 5 minutes with My battery.
I have 13x4.5 , 13x5.5 and 12x6 A PC pusher Prop.
Which One do you thing is better?
Thank you
Guil
PS in static test I use 480 mha tô One minute.
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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.
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I set for 1:30 minute flights and take 2 flights per battery until I dial in the speed. Extra speed and rpm uses allot of power so start slow and creep up with a new prop. If your ESC is set right for the low voltage cut off you won't hurt your battery.
For practice you can greatly extend battery life if you charge to 3.9 volts per cell and cut out all the level laps you can so the flight is about 4 1/2 minutes long. This will keep the battery closer to it's mid range.
Of course for a contest, fully charge your battery and set timer for 5:15 and you'll have about 3 laps left at the end.
MM
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This is my flight
https://youtu.be/5f8Dzui4q8k
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Can't debate that flight, speed looks good, time looks good, pilot looks confident.
Now practice, practice, practice!!!!
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As Mike says, if the plane feels good all you need is more handle time and a good judge/coach.