Dear Friend
please help me 
required motor & esc for conversion of  Fairchild 24 - 25"span rubber band powered to electric rc model
want to know about the
Specification:
Motor:.....................kv
KV (rpm/v): ...........
Combination of usage:
PROP - .......................
Lipo - .....................
ESC - ..................... amp
servo:........................

Please weigh the assembled aircraft and post the weight class first.

Dear Abin,
Noticed that you made 5-6 posts in different threads in the last 3-4 days on essentially the same basic issue:
A. You have a Guillow rubber powered Fairchild of 25" span
B. You want to learn to fly RC airplanes
C. You want to use A to achieve B

If you don't mind my saying so again, THIS IS NOT A GOOD CHOICE!
As mentioned on 14th:
My suggestions for a happy introduction to aeromodelling are:
1. Build the Fairchild as it is and learn to trim and fly it free flight with rubber power
2. Later get a beginner's RC combo (Model, Tx, Rx, motor, prop, Esc, battery, charger etc). Will cost Rs 5-10,000

Other members have suggested suitable models. Please consider their suggestions.
Won't be giving any more unsolicited advice. Intention was just to prevent a newcomer from leaving this great hobby due initial frustration. Best wishes. Try to keep your related queries in a single thread instead of spreading them over many.

Most succinctly put, Iyer sir 

If you really wish to go ahead with this, despite of others warning, you'll find this helpful:
http://flbeagle.rchomepage.com/software/webocalc_1.7.6/webocalc.html