how do we select the elctronics


if we are using 15A ESC what rechargable battery shuld be use
i mean what will be the current/and voltage rating.

is current rating important in selecting battery.

what does volage=2-3S mean                   is it 3volt

also what does 15A rating of ESC mean

Welcome to RC India

Please read the threads below, and let us know if any of the above questions remain unanswered :

http://www.rcindia.org/electric-power/amp-rating-and-motor-size/
http://www.rcindia.org/batteries-and-chargers/introduction-video-for-lipo-batteries/

As a newcomer, it would really help you to read through the posts selected for beginners in the Gems list :

http://www.rcindia.org/rc-india-forum/the-rc-india-gems/

We want to see that plane of yours take off to the sky

hey very thanks for directing me

i have read the thread about selecting motors and esc and rating
still doubt
but at brushless motor  online store-THIS IS THE RATING GIVEN

KV : 1300KV rpm/v
Weight : 38.3g
Propeller-Inch : 8x4/8x3.8
ESC : 15A
Voltage : 2-3S
--------------------------------------------
  so what will be the battery rating    2S or 3S
also what will be the (current)milliamps required


also we should select ESC>15A       
will ESC 20A is ok

is esc rating 15A means 15amperes of current








sorry for large doubts but am a beginner

Voltage 2s-3s :  This means you need to select a lipo that is either 2cells (7.4v) or 3cells (11.1v).

ESC 15A: This means you need an ESC that is rated to 15 amperes of current.  Higher is OK.

buy lipo 7.4v can only provide some 2000ma-3000ma


then why 15A or greater

Well, the rating is 2000maH i.e. 2000ma for 1 hour (i.e 2amps for 3600 seconds) so theoritically, you can reduce the time and increase the amps. In addition you get the battery rated as 15C  or higher. This means that the battery is capable of supplying 15 times the rated current. In this example, 2amp x15 = 30 amps. So do your maths to figure out how long the battery would last while supplying a 30amp current.

The final figure is dependant on the motor. The motor has a max AMP rating. Choose a ESC that is 20% higher and a battery with enough 'C' rating to supply that current.

The link posted earlier, http://www.rcindia.org/batteries-and-chargers/introduction-video-for-lipo-batteries/, also has an external link to the following external site, which is a great resource on such questions.

http://www.rchelicopterfun.com/rc-lipo-batteries.html

The key is that there is also something known as "C" rating (otherwise known as "discharge" rating) for each lipo, which also plays a vital part in this. 

i got 2 spare nokia mobile li-ion battery

each one about 3.7-4V providing 1024 milliamps

can i use it for rc by connecting it in series so that it supply 8V.
its written BL-5C

is 5C  the discharge rating

the main thing that its dont weight much

you can use your nokia batteries on mobile phone which have a small current drawn. you need to get lipos rated for high current rating before you start.
you really do need to do some googling and reading up . there is all the information available on this site and others.
Since you have visited an online store, suggest you put the nokia batteries where they belong - in the phone , call up and spend ten minutes speaking to the online shop person. they are very knowledgable and the advise is for free.
discuss what you are looking for.
if you are interested inb RC flying as a hobby, start off with a ready to fly model. building can come later after you get some experience.
Avijit

Quote from: dinil on February 17, 2010, 07:11:25 AM
is 5C  the discharge rating

It looks like just a model numbering scheme used by Nokia. 

Quote from: anwar on February 17, 2010, 10:12:25 AM
It looks like just a model numbering scheme used by Nokia. 

true,its just a model number of the  battery
connect some local Chinese mobile battery[cheapest and the best one]
connect them in 2s3p/2s2p config and it works gr8.