How to estimate flying time of a cell.

[stabel]

A newbie question... How to you estimate the flying time of a cell and land the bird?

Thanks

[capebob]

The first thing you need to do is to find out the average current drain of your helicopter. Most electric helicopters will fly for at least six minutes so we will us that number. Start with a fully charged battery and fly what would be a typical flight for you. Fly for exactly six minutes. Now charge your battery and see how many milliamps you put back into it. Multiply that number by ten as six minutes is 1/10 of an hour and that will give you your average current drain. For example, if you have a 2100mah battery and you fly for six minutes and recharging puts 1500 milliamps back into your battery you know that your average burn is 1500 X 10 or 15,000 milliamps or 15amps. You can also figure that your are using 250 milliamps per minute. That is 1500/6 = 250. If you are not confident that your helicopter will fly for six minutes you can fly for 3 minutes and multiply by 20 or 5 minutes and multiply by 12.

I hope this helps,
Bob

[stabel]

Thanks a lot capebob. Very clear

Stathis