RC India

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.

 :thumbsup:

 {:)}  VERY NICE   {:)}

that's a nice looking plane  :thumbsup:

Thankyou all.... ;D

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

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  :salute:, 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

I am very sorry sir, it was a mistake on my side :banghead:. 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..

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

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.

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.

 >:( this means i will have to wait for some more time till i get the smaller prop :banghead:.

While test gliding do i have to simply allow the plane to glide by its own or operate the elevator.

Vicky

Other wise, handle throttle carefully and avoid full throttle. Or cut the prop to a small size and balance it,

Sir how to adjust the CG. My plane seems nose heavy and I cannot move the battery as its slot is fixed.
And once again the same question, while test gliding do i have to simply allow the plane to glide by its own or operate the elevator.

Got actual weight of the model from a near by shop {:)}
it weighs 290 gms  ;D (including every thing)

That means that ur model wt w/o any gear is only 70 grams??? or ur battery is not 100 grams. some thing is fishy. or are u telling me the total wt w/o battery? am i missing some thing?

I have included every thing even the prop saver, the 9X4.7 prop and the wing. The only thing possible is digital balance of the shop is faulty :giggle:. or may be you have taken wrong weights for calculation. I will cross check it with some other shop. :thumbsup:

Hi Astha

Since we are talking about weights here..Is it possible to make a 32 inch profile foamy from biofoam weighing only 100 gms(without the lipo,servos,reciever,esc and motor+prop) ???? You have any similar model you could weigh and check. I have kept that weight as a target for my foamy...any building tips for achieving that???

Regards
Ankur

this is the lightest that i have been able to make with 32 inch ws
238n grams and 276 grams with 450mah, 3cell


"The plan is from Slowfly. Made out of 8mm EPP with carbon rods.
WS=32inch,9gms servox3, 9gms Esc,GWS4p,Bw1300x 6050prop, 450mah Thunderpower cell"

Here is the video clip of maiden flight. The plane flew well but it was not stable which i could not understand ???. Can anyone tell me the symptom-problem relationship.

http://www.youtube.com/watch?v=ga-U58oWORo

maiden flight really {:)} {:)}

i think u have a CG problem !

Hi Vicky

Congrats on your maiden {:)}...barely escaped the crash  :D

And yes as sahil said it looks like you have a CG problem. Looking at the video I guess the plane is nose heavy and as the plane's nose drops down you apply elevator to compensate..try moving the CG back. And do not use too much throws on the elevator.

Overall a very good flight

Edit : On again viewing your video now i feel the plane may be tail heavy. try fiddling with CG. get the CG to around 30-33% of Chord. If the nose is rising automatically then you have to move CG forward otherwise the opposite way.

Regards
Ankur

May be u are right :-\ . Initially I had CG problem but I balanced it by putting some clay on the tail end. Tomorrow i am planning to fly it again after adjusting the CG this time I will closely observe what exactly is the problem.

Ankur, I doubt the problem my be with the thrust vectoring also ???

Hi Vicky

I am not getting you. I never mentioned thrust vectoring...i dont think you are using thrust vectoring. What i mean to say is that if your planes noses down then it is nose heavy and you need to move the CG back. if you plane noses up the your plane is tail heavy and CG needs to be shifted forward.

If the plane is nose heavy it will dive. if the plane is tail heavy then its nose will rise and eventually it will enter into stall..then the nose will drop down and it will start loosing altitude..the potential energy which it is loosing(ie height) will be converted into velocity (Kinetic energy). as the sped increases lift increases and the plane will start nosing up and this process will repeat. i think that is what is happening here. I COULD BE WRONG ALSO. The next time you fly observe the flying pattern carefully.

sorry for the poor drawing..i was in hurry.


Regards

I know what u r talking about! Apart from the CG i just raised a doubt of motor angle because when i checked my model it was perfectly balanced at 33% from LE.

Dear Vicky

Thrust vectoring is totally different concept where in the thrust from the engine is deliberately changed to provide greater maneuverability. In real planes this is achieved by deflecting the nozzle whereas in RC planes it is achieved by changing the axis of the motor with a servo. That is the reason i got confused.

How have you mounted your motor. 2 degrees down and 2 degrees right????

Well I dont know 8-) how much is the angle but i am aware of the 2 degs down and 2 deg right concept.
BTW how to measure the angle. ???

Today I flew it once again after some adjustments in the CG and the rudder and it was so stable that I found it a better model than “slowstick”.
I did some loops also. Sorry I could not get the video as I was alone at the field. 
It is such a forgiving model that, no matter how big mistake you make it allows you to correct it :salute:.
I would recommend this model to every beginner :thumbsup:.

Plan and detailed build log is available at
http://www.rcgroups.com/forums/showthread.php?s=41628bb6631af1730bd32e47df27755f&t=1040899

hello sir
what r meterials used in making this plane



 

 

Dinil, I used 5 mm biofoam sheet for fuselage and the wings and thermocole for monoblock. For push rods I have used the broom sticks ;D. Please go through the attached pictures

dear vicky,
Excellent and congrats for the successfull maiden. It is flying verywell.
best regards
ashta

Thanks Ashta ;D

Hi all,

Today I replaced the wing with Kfm3 Wing with ailerons {:)}. Pictures attached below

Regards
Vicky

Video of aileron functioning ;D. Planning for test flight tomorrow.


http://www.youtube.com/watch?v=pFR-qA8hDlw

Regards
Vicky

 :goodjob:

Its looking great !! Have a good time flying :)