@swapnilnimbalkar,
Your glide test proved 2 things:
1. It will fly straight and not turn sharply to either side
2. It will not roll unexpectedly to either side
This is to be expected once you reach the stage where your construction is fairly accurate.
You have obviously reached that stage.
A test glide is usually used to check if the CG position (and elevator trim) are approximately correct.
Your test doesn't address this because:
1. It is too short
2. Launch is nose high, leading to speed reduction, followed by dive.
Please try a longer test glide, over grass, with the nose slightly down, at about the speed you think it will fly at without power.
The objective is to find the CG position where it will fly
without lifting or dropping the nose.Somewhere in my RCTLG thread, there's a video of a test glide
that went 60 metres from a 2 metre launch height!(That was a specialised glider (no motor) designed for a high glide ratio. Yours will probably do 10-20 metres, long enough to judge if it needs weight in the nose or tail)
Here's the YouTube link. Hope it helps to show how to launch for a glide test.
Best of luck.
https://www.youtube.com/watch?feature=youtube_gdata_player&v=ie2thgI193A