Rhino 1550mah 2S 7.4v 25C-37C Lipo ..If i choose this.. should i go for an ESC with 40A capacity ?

Yeah you could use this battery but discharge rate is a bit high. BTW which motor you are using? Also, burst rate of your battery is around 30C so you should not go for 40A ESC. Also, 40A ESC for an ornithopter is over powered... You should go for 20A ESC...
Please do tell which motor you are using. Also, what is the AUW of your model.

http://thehobbyshop.in/index.php?main_page=product_info&cPath=31&products_id=106 this is the motor i plan to use. 30 A ESC will do ? what determines the capacity of the ESC ? any help . really thanks for replying.

The recommended ESC for this motor is 25A. Then you should go for this one. Also, the burst current of the battery, motor operating current etc, together decide the ESC to be chosen. You should go for this:
http://www.rcindia.org/wiki/What_are_the_basics_of_electrical_power_setups_for_RC_planes

thanks utkarsh bhai. so battery 2cell 1300mah 15-25C Lipo battery ( http://thehobbyshop.in/index.php?main_page=product_info&cPath=28_29&products_id=68) and motor 3200kv Brushless Outrunner Motor(  http://thehobbyshop.in/index.php?main_page=product_info&cPath=31&products_id=106) along with ESC 25Amps Brushless ESC( http://thehobbyshop.in/index.php?main_page=product_info&cPath=34_35&products_id=113). this should make the perfect combo ? ihad gone through the post on electrical power systems. it was very useful, though i couldnt get any idea on ESC.

Yeah it seems to be good one. just asking, why everything from hobbysea only?
Also, ESC is chosen a liitle more than the max. current motor could draw...

No..i used rcbazaar and ebay for getting the products

Hello everyone. I had been working on the ornithopter design for quite some time. Decided to post an image. will upload a video too. thanks everyone 

A doubt. My ESC is http://www.hobbyking.com/hobbyking/store/__25365__turnigy_multistar_30_amp_multi_rotor_brushless_esc_2_4s.html which has a constant current discharge of 30 A. My battery is http://www.ebay.in/itm/Turnigy-2200mAh-2S-20C-Lipo-Pack-with-XT60-Connector-/191012282294?pt=IN_Toys_Games_School_Stuff&hash=item2c79381fb6&_uhb=1#ht_2059wt_1188 , which is a 2s lipo battery of 2.2Ah rating and 20C cosntant current reating. Now please correct me if i am wrong :

the battery has a peak discharge of 30C. But its constant current rating is 20C which means 2.2Ah x 20C = 44 A current can be discharged constantly. So the power input would be 7.4 V x 44 A = 325.6 W. Now, the ESC has a rating of 30A. So the max current that can pass throught the ESC is 30 A, isnt it ? so it wont let anything above 30A to pass through it, which means i can never get 44 A out of the battery ? so if the motor load increases, and the battery gives out of a current higher than 30A the ESC will burn ? Am i wrong to get into this conclusion ? Please help.

You are right but most esc comes with burst rating which can be obtained for 10 secs

So if the motor load increases, the ESC will burn ? or will it simply restrict the current to 30A for ten secs and then come down to the normal rate ? or just simply discharge ? do i need to keep a higher reating rating. preferrably a 50 A ESC for the 44 A that is tp be discharged from the battery ?

How much current does your mptor take in load.
10Sec thing is for eg i have an 30a esc it can handle 40a upto ten sec without any problem.

http://www.rcbazaar.com/products/1910-avionic-c2826-kv1900-brushless-motor.aspx this is the motor i plan to use. i am still in the fabrication stage, and havent procured the rx tx unit yet. so i am not sure as to how much current my motor would take when in load. its kv rating is 1900. can i figure out the current it would take if i were to put in a 2s battery 7.4v across it ?

Your setup is perfect just reduce the battery to a smaller one

oh.. reducing the battery to 1s lipo of 3.7 v ? but that would mean reduction in speed ? considering i follow the current 2s lipo, would it damage the setup ? it wont work ?

Not 1s us 2s but use a lesser mah lipo than 2200mah something like a 1000 to 1500 mah 2s lipo

ohh okkk got it  thanks a lot. great work

but if i were to go with the current battery,up until i buy a lesser Ah battery, will it burn the entire setup ?

No not at all but it will be a lot heavier

Hello Everyone !!  narrowing on down to the rx tx unit. However I am really puzzled. I have come across this http://www.hobbyking.com/hobbyking/store/__7527__corona_synthesized_dual_conv_receiver_6ch_72mhz.html as my potential receiver unit with a corresponding tx unit. However seeing the pins of the receiver, i am really in a dilemma whether these would fit into the female plugs of ESC http://www.hobbyking.com/hobbyking/store/__25365__turnigy_multistar_30_amp_multi_rotor_brushless_esc_2_4s.html and the servos : http://www.rcbazaar.com/products/799-avionic-metal-gear-9g-servo-av9amg-analog.aspx . can anyone tell me  ? The pins look a bit more thicker and from my knowledge they wont fit into the plugs of ESC and rx, Is there a specification to judge this ? Am i wrong ? please help

can anyone help me with ball linkages ? i need to get them for my project and i havent found them in the leading RC websites. i am not sure of the specs, please help

If I understand the need correctly, any store carrying RC heli spares (in stock, of course) should have these.

Hello everyone
I'm a student of engineering from pune.i'm fabricating an ornithopter but i'm quite unknown about the calculations need do be done to make it fly, controller unit And from where do i get the gears manufactured. Help me guys to sort ot this issues.
If anybody can explain me brief here's my email id