what about 5010 360kv? which is super efficient .

@Rahul and @Arun : Thank you for the info
how about these ?

http://www.hobbyking.com/hobbyking/store/__41878__Turnigy_Aerodrive_SK3_2822_1090kv_Brushless_Outrunner_Motor_AUS_Warehouse_.html

http://rctimer.com/index.php?gOo=goods_details.dwt&goodsid=858&productname= with 10x4.7" props and 3S
or
http://rctimer.com/index.php?gOo=goods_details.dwt&goodsid=847&productname= with 11x5.5" props and 3S.

Better than the aerodrive one. The above motors are built for mulitrotor purposes only! and rctimer is a good website

@veloci. Thank you for the tip :-) :-) i  have made the amendments :-)

Everyone, is it necessary to have GPS and auto pilot for altitude hold. ? Or are there other means to achieve greater stability and hovering :-)

with reference to greater stability, cheapest solution is u need rapid escs = simonk flashed escs, flash your escs . then u can run at double the gains settings from before which will make your quad super stable given that everything else is working properly.

edit- gps is overrated(not saying its not important). look for all the little places that can help u improve stability.

video attached as example why u need simonk.(not my video, but thank you maker of it) .

No, GPS is not necessary for Altitude hold. GPS is required for position hold.
GPS will make it more stable.

@pravesh: thank you for the info :-) :-) pardon me i am a noob. But with reference to flashin, ill need a programming card, what significance does the simonk have here. ?

@Rahulvyas: as always lightening fast :-) wouldnt absence of position hold cause a drift sideways. ? :-)

u dont need programming card, you should search the internet a little more if u dont want to stay a noob forever, everything is there to learn from. now spoon feeding is not possible(at this age).   google simonk flashing. all your answers are there. we are all nooobs. u want stabilty simonk has given u option, it makes your escs run at above 450hz. and u can pump up your gains settings, try running your quad with high gains on stock esc and watch it wobble to death.  

edits. quads etc will always drift, its a part of rc to control it. air turbulence, wind etc etc, gps counters all this and keeps quad in one place. but that is positoin hold not stability

edit-ps. u need barometer for altitude hold.

I wish I could flash my plush 25As, but its too difficult for Plush to be flashed.

altitude hold means, holding in a certain level/ height. it dosnt mean position hold.
If you add position hold feature(GPS) it will be more stable.

For that you need a FC which supports GPS. I ordered Arduflyer.

my new quad from http://www.quadkopters.com/

@ pravesh. Thank you for the info :-) i will do good to stick to it :-)
@ Rahulvyas. Thank you again.  :-)

Seems like old thread, but I post it anyways I been experiencing some drifting in my first quad ...

QuadCopter PID tuning process going on and observed pitch axis behaviour as goes: when I increase throttle (in small intervals) then quad bends little one side but then recovers and get itself level. And when I decrease throtttle (in small intervals) then it get bend other side, recovers and get level. Leveling process taking few secs. Also bending is proprotional to amount of throttle I apply in one time. But once level it respond well to radio sticks, have been fighting  this problem from quite some time then I decided to go ahead and ask on forums and here I am.

(my ques: why it is taking time to level it and why quad bending with inc/dec throttle & how to correct) 


Thanks

CG not in the center?
If so, on opening throttle, the lighter side will accelerate faster, causing tilt, till corrected by self levelling action...

Center of Gravity? I think it is check some pics

Also self leveling action happening slow like in 5 sec or so