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« on: January 19, 2010, 10:49:08 PM »
avinash.tutu
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The1st  RC plane that we had been working on is now nearly complete. To check the working of the circuit, we made a trial run of the motor. (propeller was not attached).
It worked the first few times. But after sometime, even after cutting out the throttle completely, the motor kept running. We tried switching off the reciever & trasmitter, removed the
 LIPO battery. Motor stopped only after the reciever battery unit was disconnected. The next time we tried, the ESC got burnt & the LIPO battery had bulged. This is the 2nd time
that our ESC has got burnt.
                                          We wish to know what you think had gone wrong. Could the motor have been damaged too ?
 The details are :

    weight : 1.1 kg
    battery : 3 cell LIPO, 1000 mAh
    motor   : emax BL5C2815, 30A
     esc     : emax, 50 A

also we want to know is any agency providing funding for rc projects, already we have lost lot of money due to burning of esc and cheating from a rc supplier.
 now we don,t have money to move forward
plz help


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my esc and motor burnt
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« Reply #1 on: January 19, 2010, 11:05:51 PM »
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What model is that ? the fuse looks a little small in proportion to the Wingspan.
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« Reply #2 on: January 20, 2010, 12:06:11 AM »
anwar
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There are a bunch of questions and issues. 

1. What is your radio setup ?  What transmitter and receiver ? 

2. When you say it worked the first few times, did it respond to changes in the throttle stick position ? Did it stop running at zero throttle position, and work only in some positive throttle ?  Or did it always run whenever the battery was connected ?  Did you recharge the lipo between these successful attempts ?

3. Running "no-load" (without prop attached) at high throttle for any significant amount of time is enough to kill a motor. How long did you run like this, and at what throttle position ?

4. The bloating of the battery is usually an indication of over discharging (running the motor longer than the battery could support).  Was the battery fully charged when you made the last attempt ? What is the "C" rating of the battery you used ?

5. Finally, did you make the plane from a plan ?  Like Ujjwal said, the fuse looks small (even though this may not be a problem).  Also, it is a heavy model, which puts burden on the motor.
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« Reply #3 on: January 20, 2010, 06:20:21 AM »
avinash.tutu
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1.transmitter futaba T4EXA, receiver futaba R136F 35MHZ

2. yes it responded to throttle stick position,stop running at zero throttle position, and work only in some positive throttle .
  but 2 times it worked at zero throttle position, then we switch off receiver and transmitter, but it no use still it was running, then we        removed battery(LiPo) to brushlessmotor, but motor didn't stop still it was running, this time little bit slow.For slow running energy was taken from battery for servo connection. We didn't recharge Lipo. Tests were only for few seconds.

3. We run the motor only for few seconds, varying zero to max.

4. we didn't recharge battery after buying. we bought battery before 4 months, but we didn't used it. it is
    YUNTONG 1000mAh
    3S YT653560PH.

5. we made this according to a proportion got from some site, i will post that. though it is our first plane we thought wing should be some what big so that it will be safe.

our connection dia. and plan is attaching

RC CONNECTION.jpg
Re: my esc and motor burnt
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« Reply #4 on: January 20, 2010, 07:29:05 AM »
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1.  You made a big mistake by supplying the receiver with power from two sources  Cry

There was no need to connect what you call the "receiver battery unit" at all !  The receiver will get power from the ESC itself.  I honestly wish you had published this connection diagram on the forum before you tried connecting these in the manner shown. 

Look at the connection diagram in the post below, to see how it should be done properly.

http://www.rcindia.org/radios-and-receivers/i-have-a-serious-problem-1376/msg11785/#msg11785

2.  Regarding your plane, it looks like you deviated from the plan. You can see that the "fuselage" length is much shorter compared to the "wingspan" on your plane, while in the plan, the fuselage is almost as long as the wingspan. 

You decision to build a bigger plane for stability was only half correct, as it has the side effect of requiring a more powerful power combo (motor, ESC, etc this increasing cost).
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« Reply #5 on: February 21, 2010, 01:16:41 PM »
avinash.tutu
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we have bought new Lipo and ESC. lipo 2300mAh,11.1v,20c.3 cell.
esc is emax 50amp.  i will post our new connection dig. please check that is there is anything wrong?. please inform us.already our 2 esc s are burnt
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« Reply #6 on: February 21, 2010, 01:23:05 PM »
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diagram of our connection.

RC CONNECTION.jpg
Re: my esc and motor burnt
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« Reply #7 on: February 21, 2010, 01:32:00 PM »
anwar
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Looks good.

While charging, choose 1A as the current (although your battery supports up to 2.3A).  This is because you are charging through the balance connectors, so keeping the current low on these thin wires is recommended.
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« Reply #8 on: February 21, 2010, 02:11:39 PM »
avinash.tutu
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Thank u anwar, i will inform u after testing
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« Reply #9 on: February 21, 2010, 05:06:51 PM »
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sir one more doubt

you already gone through the  specifications of our plane many times.

is that possible to fly our plane with current setup,i'm asking about motor , esc and battery.
will this motor carry such a weight.....?
according to its specifications it will.
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« Reply #10 on: February 21, 2010, 06:13:15 PM »
anwar
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The motor and ESC seems to be OK for what you are trying to do, but we also need to know what size prop you are using to see if it is all compatible with each other. Is is something like a 11x7 prop ?
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« Reply #11 on: February 22, 2010, 09:07:39 PM »
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ya it is 11*5.5E
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« Reply #12 on: February 23, 2010, 03:39:28 PM »
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dear avinash,
The 11x 5.5 prop will draw >30amps. This is>300W.
unless your plane is >1200 grams, this is an over kill.
From my experience it is better to go for planes < 600 grams as a beginer. This will require aboot 100 -120 watts of power, which means at 3 cell about 10- 12 amps.
For example, i am in this hobby from last three years and i have never exceeded 25amps current draw on 3 cells.
If u increase the current to those levels, one has to take extreme precautions, esp the esc, motor and the battery.

so if you are a beginer, my advice is to give up this plane if this is > 600 grams and make another one like Blue baby or so which is under 600 grams and start.
ELse your learning curve will drain your pockets.
ashta
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« Reply #13 on: February 23, 2010, 04:30:29 PM »
anwar
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The recommended prop for this motor is 11x7 (unless I was looking at a wrong model).  So there is already some margin of error. 

Can you confirm for us how you determined that a 11x5.5 prop on this motor would draw more than 30amps ?

Sure a lighter model always makes sense.  Also, it is best to test on the ground gradually increasing throttle and seeing if any part of the power system is getting too hot.
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« Reply #14 on: February 23, 2010, 05:16:39 PM »
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yes anwar, the motor drwas 38 amps with 11x7 prop. see the link.
http://www.plus2city.com/plus2rchobby/new_shop/emax-runner-281509-mounts-screws-p-599.html?osCsid=jmbtfjki7dhq98o69jdn0l0k83
so with 11x5.5, 30A is my fair estimation.
there could be little approximation error here,  here but is rather irrelevant wrt the point i was trying to give, i suppose.
ashta
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« Reply #15 on: February 23, 2010, 09:55:28 PM »
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our prop. is 11*5.5E, it is tracker propeller right? in which direction it should rotate when looking from front?
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« Reply #16 on: February 23, 2010, 10:40:38 PM »
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The simple way to look at it is... you want the air to be pushed backwards ("from the nose to the tail") !  Wink

If the motor is rotating the other way, just interchange any 2 of the 3 wires that go from the ESC to the motor.
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« Reply #17 on: February 24, 2010, 12:35:20 AM »
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Thank u everybody, we tested the circuit successfully from the ground. Soon we will test our plane
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« Reply #18 on: February 24, 2010, 05:04:54 PM »
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waiting to see your plane flying
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« Reply #19 on: February 24, 2010, 10:40:38 PM »
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Thank you, tomorrow morning  we are going to test the plane
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« Reply #20 on: February 24, 2010, 10:46:12 PM »
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don't forget to take pictures and post it here
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« Reply #21 on: February 24, 2010, 10:59:29 PM »
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Avinash - Please remember and ensure good throttle control. Fly it with enough throttle to keep it flying well.  Do not try at full throttle (or high throttle) just for the heck of it Smiley  The power drawn goes up with throttle applied, and it *may* put your electronics at risk.  You may need high throttle for take off, but reduce it to the needed levels soon after.
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« Reply #22 on: February 25, 2010, 02:25:53 PM »
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please fly only at large n clear ground and if possible take help for fellow experienced fliers !

best

sahil
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« Reply #23 on: February 27, 2010, 12:36:23 PM »
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How did it go Head Scratching
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« Reply #24 on: March 02, 2010, 11:34:07 AM »
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         We attempted to fly our plane last thursday. It was given a hand launch. It lifted a bit, but crashed soon after. The nose broke due to impact. We are not sure whether the crash was due to improper launching or something related to the model itself.
         We now intend to build another using Simple Plastic Airplane Design ( SPAD). { SPADTOTHEBONE.COM }. With this we hope to gain more experience in flying without significant damages.
         We hope that you will continue take interest in our project and advice us.
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« Reply #25 on: March 02, 2010, 11:42:07 AM »
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Avinash,

Sorry I couldn't revert to you earlier. I was caught up in too many things including my first Para Gliding experience. Please PM me your phone number.

Regards,

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« Reply #26 on: March 02, 2010, 12:15:03 PM »
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Sorry to hear that.  Did any of the electronics or power system get damaged ?

I do wish you had tried the first flight in a paddy field with the plants that have grown up to some height (thereby absorbing most of the impact).
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« Reply #27 on: March 02, 2010, 02:42:05 PM »
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avinash build a stick type model similar to slow stick GWS, i'm sure your next model will fly great just don't over build the model, stick to the plans and select a model which will work with your present electronics,power system etc!

sahil
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« Reply #28 on: March 02, 2010, 03:10:18 PM »
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can anybody give a  plan of stick model, our power combo is given in the post
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« Reply #29 on: March 02, 2010, 03:21:09 PM »
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hey avinash i just went through the link astha has posted about the motor, i think a Bohur 25 would be good choice! lets see what others say..............

http://www.spadtothebone.com/freeplans.htm
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« Reply #30 on: March 02, 2010, 04:21:38 PM »
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fortunately nothing happened to our electronic parts,
Anwar in our area we couldn't find any paddy field. Now we are in kollam.This is very congested area. We have a large ground in kollam, it is asramam ground, in which we performed our failed flight Cry
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« Reply #31 on: March 02, 2010, 04:24:04 PM »
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Hi Avinash,

You wanted a build plan for a stick-model... please see the attached...

This is a light weight slow-stick...for the fuselage you could use an 1/2 inch aluminum channel or the rods of the TV antenna... For the body use the material used in sign-boards (corrugated plastic). You need two 5 or 9 gms servos and a 3 channel Rx-Tx...

Goodluck

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« Reply #32 on: March 02, 2010, 06:41:38 PM »
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clean design
the pics describe everything

but how to attach motor at front
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« Reply #33 on: March 02, 2010, 06:45:46 PM »
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dinil its a slope glider!
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« Reply #34 on: March 02, 2010, 06:52:58 PM »
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Sahil - It can still take a motor Wink

The first time I saw this on the blog, I felt that it is a close cousin of the MOSS glider from Sai !

Dinil - Lots of mount options discussed here : http://www.rcindia.org/tools-materials-and-building-techniques/how-to-mount-electric-motors-on-foamies/

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« Reply #35 on: March 02, 2010, 06:53:11 PM »
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clean design
the pics describe everything

but how to attach motor at front

Dinial - To attach the motor we used the plastic-ties that are used in grocery stores (like Reliance, Spencers, etc) or you can use 3-4 wires and tightly wound it around the motor...
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« Reply #36 on: March 02, 2010, 07:03:43 PM »
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then also it could be modified to a powered glider
put a motor in the front[in-runner brushed] and a compitable esc
use a 2s lipo
and either make it 3ch with throttle,elev,aler[normal config with throttle]
or 3ch with throttle,elev,rudder[normal config of a 3ch powered glider][aler. servo used for rudder]
or add a extra servo and make it 4ch!!!
get the 380 size motor with gearbox and folding prop from sai uncle and that will be the best!!!
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« Reply #37 on: March 03, 2010, 12:28:06 AM »
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i think a Bohur 25 would be good choice!

BUHORs look sexy Giggle

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« Reply #38 on: March 04, 2010, 11:53:35 PM »
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thank u sahil and sethji
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« Reply #39 on: March 04, 2010, 11:56:45 PM »
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we decided to go with sassy
http://www.spadtothebone.com/freeplans.htm.
can we use our power system for the same? 
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« Reply #40 on: March 05, 2010, 08:30:56 AM »
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clean design
the pics describe everything

but how to attach motor at front

BTW the MOSS Design  Originates in the MISS

MASTER MOSS as it was called was exactly a Motorised version of the MISS in fact the name MOSS is ( Motorised Slope Stick )

here are some Photos of the first MOSS .

Here is a Video of the Master MOSS


Sai

MOSS_1_(6)_opt.jpg
Re: my esc and motor burnt
* MOSS_1_(6)_opt.jpg (14.85 KB, 400x300 - viewed 649 times.)
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« Reply #41 on: March 05, 2010, 01:48:22 PM »
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we decided to go with sassy
http://www.spadtothebone.com/freeplans.htm.
can we use our power system for the same? 

If you are referring to the one (the name is not "sassy", but there is something more to it) which was designed for 0.15 engines, then your current setup should easily handle that airframe.
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« Reply #42 on: March 11, 2010, 06:01:32 PM »
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please watch our first stepping stone
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« Reply #43 on: March 11, 2010, 07:12:19 PM »
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It is a shame, looks like a good plane Sad

Did you launch into the wind ?  Were any kind of testing done to see if you had enough thrust ?  Can't see if elevator was applied properly or not.
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« Reply #44 on: March 11, 2010, 09:58:12 PM »
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we have almost completed our new plane(sassy........)
http://www.spadtothebone.com/freeplans.htm

 but problem is where to fix the landing gear,
can can anybody tel me where to fix landing gears? what is the difference between fixing landing gear in front and back?
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« Reply #45 on: March 11, 2010, 10:28:06 PM »
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BTW the MOSS Design  Originates in the MISS

how much does the Master moss RTF cost?
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« Reply #46 on: March 11, 2010, 10:42:53 PM »
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no, there was not much wind.
we didn't perform any tests for thrust.
how to test thrust?
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« Reply #47 on: March 11, 2010, 10:47:46 PM »
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lolz kartik
rtf without tx/rx :- http://cgi.ebay.in/RCFORALL-MR-MOSS-GLIDER-BRUSHLESS-BEGINNERS-COMBO_W0QQitemZ110362947515QQcmdZViewItemQQptZLH_DefaultDomain_203?hash=item19b224efbb#ht_2248wt_754

rtf with 2.4g radio :- http://cgi.ebay.in/RCFORALL-MR-MOSS-GLIDER-BRUSHLESS-BEGINNERS-RTF_W0QQitemZ150331948788QQcmdZViewItemQQptZLH_DefaultDomain_203?hash=item23007b7ef4#ht_2301wt_754
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« Reply #48 on: March 12, 2010, 11:34:05 AM »
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it is difficult to write and explain here. it has to be more interactive. pl call me 9448073127, i may be able to give you some tips.
ashta



no, there was not much wind.
we didn't perform any tests for thrust.
how to test thrust?

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« Reply #49 on: March 12, 2010, 12:40:49 PM »
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Astha

I think you should give it a try to explain here..may be in a nut shell so that others also benefit from your wisdom.

Ankur
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« Reply #50 on: March 12, 2010, 12:54:09 PM »
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will do that surely, after we discuss and understand. Hopefully, then,  it will be more real and to the point  than possibilities and guess work. Idea of doing it is for the very purpose of sharing in this forum only.




Astha

I think you should give it a try to explain here..may be in a nut shell so that others also benefit from your wisdom.

Ankur
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