Hey Vineet, If you have some problems with the bolts and nuts, I can send you some 4mm non-ss.  Do you want some?  and thanks for that link.  let me see what I can get from there.

4mm  3 cms in length

@dreamfly i think u have move from open pilot to Dji - WooKongM
configure the IOC u can fly kilometers away from the home point,,,,

@dreamfly
Sir it's Flying Model Simulator. Here is the link
http://modelsimulator.com/
It has quadcopter and Y-6 models available.
@Vineet
Is there any time restriction in RF6 demo version?

@ Dharmik: no, there's no time limit, but I'm unable to connect my tx.
Thanks for the link, I'll try fms.
@ dreamfly: Thanks a lot for the offer but it's pretty uneasy to trouble you for nuts and bolts... I'll try a little more and will ask you if I can't get any. Thanks.

Here are quadcopter models for fms sim
http://home.comcast.net/~scarzvanetten/fms/dfvti.zip

http://home.comcast.net/~scarzvanetten/dfx6.zip

http://home.comcast.net/~scarzvanetten/fms/df-xpro.zip

Hemanth Bhai,  I have a dji Naza but.........  Still fly the Openpilot.  I dont know why.  There is a lot of fine tweaking you can do on the openpilot and I guess that's something I really want to play with. I fly the Naza occassionally. I hope you understand what I am trying to say.  No doubt the naza is a fine controller and almost absolutely no tweaking necessary,  But you ask a Computer nerd if he would rather use "Windows" and not linux,,,, and you wont like what he might say to you.  But for a newbie I must say it's a very nice controller with nothing really to tweak and can get up to speed in no time but ofcourse at the higher price tag.   This is my personal view ofcourse. 
  
Dharmik Bhai,  Thanks for thet link I'll downlaod and check it out

Vineeth Bhai,  No problems  "Ask anytime"  

Thank you sir. Here are more HEXA, OCTO, QUADRO models
http://svn.mikrokopter.de/listing.php?repname=Projects&path=%2FFMS-Modelle%2FZIP%2F&#A752e684c35a388367f5e03578f201bae

@dreamfly i hope dont get any stream error while flying with openpilot and has long as u don't have any costly equipment in ur multirotor...

Great links Dharmik bro. It's on download now.

Wow Dharmik Bhai,  That's  a nice link of Mikrokopter.  Will go thru in my spare time. Thanks once again.

@ Hemanth bhai,  What's Stream Error?  So far I have not encountered any errors but may be this is something I should be aware of.

Thank you friends,
I tried real flight 6 sim. They have disable tx support in demo version, only keyboard and it's really hard to control model using keyboard.

Yeah, I thought that too. I've been playing (not using) it since 3 months on keyboard and now it's quite easy. But using a keyboard doesn't help much, the purpose of using a sim is not served - to get used to the sticks.

@dreamfly ur esc with get no or max ppm in air....so this totally ruin ur quad and dji naza or wkm are the only controllers free of it that too 99% only....so try and pwm isolator cricuit to make ur system 100% bullet proof...

Hemanth bhai,  I have not understood this, Kindly elaborate.   What's a PWM isolator?  I definately would like to make my quad not die up in the air while flying.

Finally Caught up with Mr.Ashta over the weekend and I was pleasantly surprised at how much effort and time he spends at this hobby he loves.  A lot to learn from him.  He gave me a lot of tips and I even got to fly his baby  "his personally designed multiwii board". (Given the time he would have even built the motors and ESC's). I think it flies beautifully even with the board off balance on the frame which I later noticed and pointed it to him.  He himself is a very confident flier in a confined space and I can imagine what he would/could do with open spaces.  He is also not confied only to Quads but also builds and flies a whole array of fixed wing aircrafts.  I was so stunned at his collection that I had taken a camera and completely forgot to shoot some pics which I would have posted on this forum.   Thank you Mr.Ashta.  I salute you!  and hoping to meet you soon once again.

Thanks Roland for coming home.  and spending time. As you have not visited Hoskote, we will go one day together.

I am new to quads. Can someone please throw some light of propellers needed.
What kind of props are needed for a quad to work?
What is RH rotation? Is it the same CCW?

Thanks

Well you need both CW and CCW rotating props. RH (Right Hand) rotation means CW rotation props

That helps, thanks

Thanks for extending yet another invitation Sir.  I'll surely join you if and when I am free.  Thanks once again.  we'll be in touch.

i got following setup
750 kv rc electro motor
25a red brick
i86 board
q450 frame

when it fly it goes backwards. i have tried trim but it didnt work well. i have seen people tuning with a jig or strings. can some one guide about tuning with string method?

hi @karandex,  Which FC are you flying it with?  Based on the FC respective users would be able to help you.

hk i86 its clone of eagle n6. mems gyro. its gain change only. it seems i need to increase the gains and it occilates i should decrese it