There is a nice thread on the above subject here
http://www.rcgroups.com/forums/showthread.php?t=1513678

Based on the above I flashed SIMON K FW on the our HK- 10A SS series ESc. The advantage is that this firmware is specialy suited for Mutirotor applications.
The main features are:

•   16MHz operation on most boards
•   16-bit output PWM with full clock rate resolution (~18kHz PWM with a POWER_RANGE of 800 steps)
•   24-bit timing and PWM pulse tracking at full clock rate resolution
•   ICP-based pulse time recording (on supported hardware) for zero throttle jitter
•   Immediate PWM input to PWM output for best possible multicopter response (eg: ideal for tricopters, quadcopters, etc., but NOT where   where slow-start or really any significant current limiting is needed!)
•   Accepts any PWM update rate (minimum ~5microseconds PWM low time)
•   Optimized interrupt code (very low minimum PWM and reduced full throttle bump
•   Configurable board pin assignments by include file
•   Improved startup (though heavy hard drives are still a bit dodgy - suggestions/patches welcome!)
•   Forward and reverse commutation supported, including RC-car style reverse-neutral-forward PWM ranges, with optional


Attched are some photos and the video.
I got some improvment on the stability, Minne was alredy stable. However i have to try the improvement in the Aerial photography

best regards
ashta

some more pictures and the video of Quad after reflashing the ESC with SIMONK Firmware.


best regards
ashta

really nice , great vid and very nice QUAD design

thank you RC-Dude

Ashta sir,
nice video with camara with cap........

thank you rajsigma

Wonderful ashta sir. and thanks for the info.

Here is simonk firmware flashing tutorial on hk F-20A escs

I've been reading that thread on RCG, but I remember reading somewhere that re-flashing with SimonK's f/ware makes the ECSs incompatible with their ESC programmer. Is this true?

Vineet

Yeah bro, you will no longer able to change any settings as it will erase stock firmware completely but you will get new firmware specially designed for multirotor. You can calibrate throttle range though.

OMG! THE ULTIMATE PROOF:



Post: http://www.rcgroups.com/forums/showthread.php?t=1584629#9

QuoteTimecop: You should see very fast, small oscillations, keeping the arm level. This is good.
If you get large wobbles, or the arm drops, or the motor stalls etc, the ESC response is crap.

I also posted in the multicopter tutorial thread.

Vineet

Very nice video vineet 

I don't understand what exactly they want to show in that video.

They want to show that the response time increases after the ESCs are flashed, I guess, or that the fluctuations (unwanted) in the ESC's output signals come down when they're reflashed.

I have been composing this tutorial from past few days. Now here is complete tutorial.
http://rcsci.blogspot.in/2012/08/tutorial-simonk-esc-firmware-flashing.html

Great stuff bro

Can you believe! Now readymade socket has arrived.
http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=27195&buddycode=2BCC4591-EF5E-4AE7-AA9E-97133FCCBF07