I have completed my first scratch buit plane.
Its modified blue baby with 40" wing span..
Power system is

2212/10 motor
20 A ESC
1000 mAH 11.1 V Lipo battery
6 gm Servo

I dont know the AUW as i have no means to measure but the plane seams heavy. Dont know how it will fly.

Thanks to Atul for helping me out in getting the depron sheet from Pune. Picture of my plane are as follows...... Sorry for the poor picture quality as they were taken by webcam.

  Neat looking bird - if she flys as well as she looks, you've done a very good job!

Congrats and keep us posted.

Cheers!

VC

Hi Vicky,

That was a very fast build man..Good work All the best in the maiden do give us a flight report..

Cheers

Atul G.

 

   VERY NICE   

that's a nice looking plane 

Thankyou all....

Before I go for maiden two things i want to make sure how much should be the movement of rudder and elevator. secondly shall i use APC 8x6E (I already have) prop or the recommended 9x4.7 slow fly(I don't have) prop .

Dear Vicky,
The motor you intend to use 2212/10 would draw more than 20A when used with 11.1 volt battery and 8X6E prop and that would fry both the motor and ESC. It happened to me. 

I value your advice sir  , but i have been using this combination for my slowstick and i did not face any problem.

Vicky

After burning my first set I tested a second set with a watt meter to see the current draw at WOT and in the few seconds it took me to take the watt meter reading the motor became too hot to handle and the current draw was just above 20 A. If I had continued running the motor I am sure I would have burned the second set of motor and ESC combo also.
To be safe test the current draw using a watt meter.
Good Luck

Am using a 2212/13 motor with 30amp esc with a 10*4.7 prop..Rao sir do you think this would be a good combo for the blue baby..

From the specifications sheet for 2212/13 motor attached to this post, you can see that this motor is a 150  Watt max with 12A max current. We can also see that with a 3S Li-po battery and 10x4.7 prop would draw 13A approx which is more than what this motor can safely handle. So if your plane weighs less than a 1000 gms then 9x5 prop would be a better choice.
Good Luck

Quote from: Rao on February 21, 2010, 05:15:55 PM
After burning my first set I tested a second set with a watt meter to see the current draw at WOT and in the few seconds it took me to take the watt meter reading the motor became too hot to handle and the current draw was just above 20 A. If I had continued running the motor I am sure I would have burned the second set of motor and ESC combo also.
To be safe test the current draw using a watt meter.
Good Luck

I am very sorry sir, it was a mistake on my side . I checked my ESC once again and it is 40 amps. I had 20 A in mind because my initial setup was 20 A but i changed it to 40 A after my esc got damaged in a crash. But still the motor is same and it is not getting hot. BTW i have ordered 9X4.7 prop from sai. Do u think this will be ok for 2212/10 with 40 amps esc.

kool...9*5 prop it is then..thanks for that pdf file rao sir..

Attaching the data sheet for this motor. When using this motor with 3S li-po the recommended prop is 8x4. Go through the data sheet carefully and you will find which combo best suits your purpose.
Good Luck.

awesome..thanks rao saheb..am going to make a lot of scratch builds later on as time permits and you will soon see a long winger as my next build..inspired by mountain switch blade from rcgroups..

My progress so far..cut the depron sheet in and sanded all the cut outs by a 120 size sanding paper as instructed by Ashta sir..

and my build is extremely slow..hehehe..waiting for some electric stuff..

thanks again..rao sir would love to see some pics of your electric planes..

Quotewould love to see some pics of your electric planes..

Sure would post some pictures of my planes tomorrow.

dear vicky,
nice build. congrats.
Let me add few more tips in continuation to rao's comments

Let me estimate ur model wt.
Motor+prop 58
Esc   40
RCVR 10
Servo 15
Bat 100
Total 223.00 Grams
Model wt = say max 200
So total 423.00 say 450 grams.

From the Spec a 7x3.5 prop at 11V is more than enough for this and will draw max of 7amps.
If u think that model wt is bit more than what i have estimated then and then only use 8X4 prop.
with 8X4 prop current almost doubles to 14A and the efficiency also goes down.

Before actula flight do some test glides in a tall grass area and ensure that it glides well. This is a must even if u have to travel a few kilometers to do it.

best of luck to u
ashta

can some one give me advice on how to make a 3D plane a simple model shall do

There are tons of plans, just search in this forum.

Here is one my brother built and I did a few test flights on.

http://www.rcindia.org/electric-planes/another-scratch-built-3d-foamy/

The plan details for the same are here : http://www.rcindia.org/electric-planes/another-scratch-built-3d-foamy/msg12137/#msg12137

Quote from: Ashta on February 23, 2010, 02:59:33 PM

From the Spec a 7x3.5 prop at 11V is more than enough for this and will draw max of 7amps.
If u think that model wt is bit more than what i have estimated then and then only use 8X4 prop.
with 8X4 prop current almost doubles to 14A and the efficiency also goes down.

Before actula flight do some test glides in a tall grass area and ensure that it glides well. This is a must even if u have to travel a few kilometers to do it.

Thanx sir. It is difficult to find tall grass in this season but as u said I will definitely try to find out some place with tall grass.
I did not understand the difference between actual flight and test glides can you please elaborate.
One more thing if I use a 9X4.7 prop  instead of 8x4 prop how much difference will it make as I have already ordered if from Mr Sai.

Quote from: vicky on February 24, 2010, 09:20:18 PM

One more thing if I use a 9X4.7 prop  instead of 8x4 prop how much difference will it make as I have already ordered if from Mr Sai.

Dear Vicky
It is advisable to buy a watt-meter so that you can actually check how much current an electric setup will consume. It is a good investment if you plan to stay in electrics.

Regards

1. Test glide:

Arm your plane with all the electronics. Sw on the radio, check controls and see that all are fine. trim the controls. Doubly, trply make sure that the CG is right.
Now go to a feild, having tall grass, or hay or bushes or sand etc. the idea is to try and throw the plane and watch how it glides with out power. If it is having a nice glide, then 99% chances are that it will fly well, unless it has some thrust angle issues. The idea of choosing tall grass etc. area is to avoid damage to ur plane while landing.

pl see datasheet that rao has provided. 9x4.7 is nor recommended for 3 cells. it will be too draw too much current and can burn the motor/esc if not carefull.
if u want to make a watt meter urself see this
http://www.rcindia.org/servos-gyros-and-all-electronics/low-cost-diy-volt-amp-meter/msg8776/#msg8776
ashta

Just a doubt, the data sheet indicates that with a 8x4 prop the amp draw of 15 amps at 11.1v. Then an esc with a higher amp rating should be ok to avoid heating up and burning the motor. Is that correct. Or is it that the larger prop will result in more load on the motor and hence cause it to burn.

TG, pl note that this is a 150- 160W motor. If u exceed this, the motor will get too hot and  burn. This means that at 11 volts max is 15A. Safe limit will be about 10A.
Larger rated ESC will make this process easier by pumping more current to the Motor load.

Quote from: tg on February 25, 2010, 01:35:50 PM
Just a doubt, the data sheet indicates that with a 8x4 prop the amp draw of 15 amps at 11.1v. Then an esc with a higher amp rating should be ok to avoid heating up and burning the motor. Is that correct. Or is it that the larger prop will result in more load on the motor and hence cause it to burn.