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Old Feb 03, 2011, 06:05 PM
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USA, CA, San Anselmo
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Flight Times on 2200mAh

Trying to figure out flight times on my stock parkzone birds. I use Turnigy 2200mAh 3S 25C Lipo Pack on all my ParkZone planes. Corsair, Mustang BL, Wildcat, and T-28. I have my timer on my DX6i set at 6 minutes and land at that time. Can anyone tell me from experience how much flight time you are getting with the above setup? I realize there are many variables but just trying to find an average.
Am I conservative with 6 minute flights?
Also what the best way to field check a battery to see how much juice is in the battery packs?
Thanks
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Last edited by doubleduce; Feb 03, 2011 at 06:25 PM.
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Old Feb 03, 2011, 06:15 PM
buy a lot, fly a little!
stuart warne's Avatar
Hong Kong, Hong Kong Island, Central And Western District
Joined May 2001
5,752 Posts
I used long max tripples 2300 3s 25C in my old Trojan, I'd usually get 10-12mins of mixed throttle flying or 7-8min flying at mostly full throttle. But with the Multiplex Funcub, I can get up to 20mins, although the majority of that is at less than 1/2 throttle.

It just depends on your flying style. You could always go up to say a 3000mah, after a little bit of surgery to the battery bay. The models will take the extra weight. Just check your CG first, and maybe save the bigger packs for the windy days when the model will benefit from the extra weight in the air.

This is a great gadget to have at the field and when charging at home IMO, I wouldn't be without mine:

http://www.f1hobbies.com/shop.php?id=1505&level=

or something similar from HK, though this is only for lipo's:

http://www.hobbyking.com/hobbyking/s...dProduct=10328


S.
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Old Feb 03, 2011, 06:37 PM
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Pawtucket R.I.
Joined May 2008
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I get 10 min from my F4F with an 1800 mah 3s 20 C batt. I fly scale ,no more than 60% throttle.Theres plenty of juice left after 10 min.Brutus
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Old Feb 03, 2011, 07:52 PM
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United States, MD, Lusby
Joined Jan 2007
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On all my PZ birds, I stick to 8 minutes of mixed flying.
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Old Feb 03, 2011, 07:54 PM
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Augusta, KS USA
Joined Dec 2007
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doubleduce -

You are being conservative with 6 minutes. I fly my stock Wildcat (1300ma) and get 8 min. and use 70% of the available safe voltage from the battery.

I just use a regular multi-meter to check max.voltage (~12.4v) and then lowest allowable safe (~11.1v.) and find the percentage of the voltage used as the allotted amount for a given time. By just stretching your flight times in increments you'll discover how much time it can run to a safe low voltage. I'd think 10 mins. easily as a guess.
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Old Feb 15, 2011, 01:43 PM
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USA, CA, San Anselmo
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Great info, I'll start bumping up my flight times, 30 seconds at a time.
Thanks for the help
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Old Feb 15, 2011, 02:20 PM
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Brooklynstar23's Avatar
Brooklyn, NY
Joined Nov 2010
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Quote:
Originally Posted by doubleduce View Post
Trying to figure out flight times on my stock parkzone birds. I use Turnigy 2200mAh 3S 25C Lipo Pack on all my ParkZone planes. Corsair, Mustang BL, Wildcat, and T-28. I have my timer on my DX6i set at 6 minutes and land at that time. Can anyone tell me from experience how much flight time you are getting with the above setup? I realize there are many variables but just trying to find an average.
Am I conservative with 6 minute flights?
Also what the best way to field check a battery to see how much juice is in the battery packs?
Thanks
Hey...after your done flying for those 6 minutes what are the cells reading on your battery when you go to charge it? The reading on those cells is a good indication of how long you can fly...remember to follow the 80% rule...

The 80% rule is applied by keeping track of the mAh used during a flight and keeping it below 80% of the rated capacity of the pack. That 80% is calculated by

80% of pack mAh = pack mAh * .8

For example here is 80% for the following packs

3s 850mAh 15C lipo
850mAh * .8 = 680mAh

3s 2200mAh 45C lipo
2200mAh * .8 = 1760mAh

6s 2200mAh 20C lipo
2200mAh * .8 = 1760mAh

6s 5000mAh 25C lipo
5000mAh * .8 = 4000mAh



So how do you figure out what % of a lipo has been used after a flight? You charge the lipo with a smart charger capable of displaying the total mAh put in during the charge. That number represents the mAh taken out during the flight. To find the percentage

(mAh used / lipo capacity) * 100 = % used

For example take a 2200mAh lipo. Say you use this pack and recharge it to find you put in 1550mAh. The % used is

(1550mAh / 2200mAh) * 100 = 70.5%




Now use it to determine flight time...


Now that you know what the 80% rule is and how to calculate the % used during flight, lets put it to use. First you will need a flight timer. Some radios have them built-in but if your radio does not, a digital egg timer or other cooking timer can be used. Start by setting your timer for 3min and then fly for those 3min. Next you recharge the flight pack to learn how much mAh you used. From there you can make a rough estimate of how long a pack will last.

For example lets say you have a 450 sized heli that uses a 2200mAh 3s pack. You set your timer and hover the heli 3min. When you recharge the pack you find that the charger put 761mAh back into the pack. Since you are aiming to use no more than 80% of the 2200mAh pack, or 1760mAh, you now know you can more than double your flight time. So you go out and hover for 6min. That time when you recharge you find that your heli used 1568mAh. That tells you that for hovering 6min is very doable.

Another approach is to fly for a known length of time and then divide the mAh replaced by the charger by the minutes flown. That will give you an average mAh/min number that you can then use to determine max flight time. Using the numbers from the above example, a 6min flight used up 1568mAh. So each minute consumed 261mAh. Dividing 1760mAH by 261mAh will tell us how many minutes the heli will fly while consuming 261mAh per minute. That time is 6.7min.

Of course we arent talking helis here but the same concept can be applied to the airplane...when you fly for those 3 minutes how did you fly? aggressivly or leniently? Take that into account...its good to keep a bettery log as well to get a good average of the typical flight time you can expect...goodluck
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Old Feb 15, 2011, 11:18 PM
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USA, CA, San Anselmo
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Brooklynstar23
WOW thanks for the education. It all made sense to me and will use your formulas to calculate my potential flight times. Again thanks for the in depth info. Very helpful!!!!!!!
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