@aditya:
well regarding the radio apparatus i guess i have already corrected my answer
it was a type
mistakenly i typed the wrong answer
![Smilie](images/smilies/smile.gif)
![Smilie](images/smilies/smile.gif)
![Smilie](images/smilies/smile.gif)
regarding formation flying i have read the answer somewhere
will now have to search for the source
will be right back for it