RC India

I am new to this hobby & this is my first built so dont mind about the poor build  8-)

I built this frame with all the cheap materials i found.

plane plan:
http://www.mikeysrc.com/FPV-Pusher-Plane.html

body is made of coro, actually these pieces are cut out of three aircel coro boards  :giggle:
For support instead of carbon fibre rods i used cycle wheel spokes. Control horns are made of plastic card of sim.
the total airframe costed me only around 50RS(hot glue,spokes)

electronic components
motor : http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8621
prop : 5*5 which came with my AXN floater
ESC : 20 amps ESC which i salvaged from my AXN floater.
servos : 3 * 9gms hxt 900
battery : have 2200mah & 650 mah 3S(confused of which to use)

Weight without battery around: 500-600 gms (haven't weighed it, just a guess)


problem:
           The suggested prop in the plan is 10*6.But i have only 5*5.
           The CG is way back.  planning to add some weight in the front to make the CG at the point as per the plan. Any suggestions ??? :help:

I would be very happy if experts in this form put a cheap built like this, with common available materials.

i cant help you but i can sirely appriciate your work
nicely done.

Thanks speedracer :)

About the spokes. I have 4 four for the wing support which can be clearly seen. 2 in each of the tail piece(Inserted into the flutes after using hot glue on the tips). 1 in the fuselage. Since the aircel boards were little short i couldn't make the full wings with one piece so i cutted two identical piece & joined both with 3*10cm spokes at the top, middle & lower part. Then placed a piece of coro above it(the red strip in the middle of the wing). The servo for the elevator is placed close to the spoke in the tail.

HOW DID IT FLY?

haven't made a maiden. Think that the 5*5 prop are not enough. Ordered some 10*6 props from rcdhamaka, waiting for the prop.

 {:)} :thumbsup: {:)}
 :salute: best of luck :salute:

Hey, sweet model.. Love the super simple design.. I'm sure the Aircel people will be happy with you for all the free publicity.. :) Wish you best of luck with your test flight.. :thumbsup:

I have a silly question.

Can anyone please tell about the rudder set-up of this model! I cannot understand from the pics.
The two servos are used for Aleron and one for elevator possibly.

Moreover, wothout battery positioning, how the CG can be achieved?

Thanks prateek & medicineman.

@ Kalyan

            This model doesn't have a rudder ;). check out the plans which i have posted at the start of this thread. About the CG i placed the 2200 mah battery in the battery slot(the small horizontal shelf in the fuselage) & checked the CG. reciever & ESC will be fitter to the side of the fuselage on the sides which they have been placed in the pic. Also before trying for the CG i used a double side tape to fix them on the side of the fuselage(In the pic the tape is removed).

One of the member suggested me to use 'direct drive props(DD) dont use reduction drives (RD) props'

I dont know what exactly they are. Can some one explain

RD props are similar to SF prop (they might be same aswell 8-)), these work best on low kv motor, DD are suitable for high kv motor.

Ditto. RD=SF. Use motor in the 1800-2400kv range and put a 7x3 or 6x4 DD/Sports prop. Use a Prop Saver (rubber band) and not the Screw-in Prop Adapter and you would save lots of props on landings.

Please correct me, i might be wrong  8-).

yes i am using a prop saver  :P
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10908

The holes were little small. I drilled it using a 1/8 inch drill bit

For the motor, the plan says i need 1000kv motor & mickey had a video for this plane, In that he specified this plane can carry 1 pound of equipments. That's why i decided to build this using coro since it still can handle the extra weight.

Also the prop from the plan is 10*6 so i have made an order from rcdhamaka(also have ordered 6*4 & 8*6).

Between i removed the reciever, ESC & battery. fixed a steel scale in the tip so that the CG came close to the point in the plan. Throwed it to test how it flies. It glided like a paper plane & landed with its tail first(tilted up).

Is this how it behaves or its the CG issue which is making it to land the tail first.

Shifted the battery to top of the plane near to the CG point. now the plane glides & lands with its belly. Recieved the props today. 10*6 was gigantic & heavy. when i used it the thrust was too much, so i used 8*6 & feel that the thrust is enough to push the plane. Will do a maiden this week end.

 :help: :help: :help:
To overcome the torque should the motor be projected up->right or up->left?
looking from behind the prop is rotating clockwise. currently i have made it up->left.

Looking from behind the prop, certainly a bit to the right, and a small bit down. The right is the most important aspect.

anwar can you elabrate more on why i should make it down->right.

what i thought was, looking from behind
The propellor is rotating clockwise. The torque will try to rotate the plane anti-clockwise. so if i make it up->left since it is a pusher the force will be at an angle 45 deg which in turn tries to bring the plane back to its horizontal position.

Oops, my bad... I forgot the fact this is a pusher :banghead:

See this : http://www.rcindia.org/beginners-zone/mounting-motor-for-pusher-prop/

So, is up->left ok?

For pushers, what I remembered was that it is dependent on the position of the motor in relation to the wing (above or below).  If the motor is above the wing, you need to tilt the prop side of the motor up so that the thrust line of the motor falls in front of the wing (and vice versa). 

In your model, it seems like the motor is pretty much flush with the wing, so you may not need much of anything.  Please wait for more experienced folks to answer, as my experience on this is limited ;)

With the motor a bit below the wing, I think you may need to point it a tiny bit down, or just leave it alone !

BTW, you said your prop is rotating clockwise, looking from behind. Not sure that sounds right, if you are using a true pusher prop.

Azha, wish you all the very best for the maiden. We are all rooting for you. Well done!

chees.. thanks VC  ;D

@anwar
I only have seen an AXN floater blades which i have. i took it out & checked. :headscratch: but that also rotates clockwise looking from behind.

Looking from behind the prop, you are right, it should be clockwise.  Looking from behind the plane (for a pusher), it should be counter clockwise.

I am little bit confused. Here is a snap of both my build & axn. i have suspended the props such that if the motor rotates clockwise the LE will cut the air first. should i have to flip the prop?

This looks right, how ever it is :)

The way I try to remember it is, that glow engines always rotate counter clockwise when viewed from in front of the prop, regardless of pusher or tractor.  So for a pusher, the pitch has to be reversed.  For electrics, the option is there to use a tractor prop, along with reversing the direction of the motor.  Using a tractor prop in pusher configuration is less efficient though.

I could never figure out the 'reverse prop'. Anyways, for using normal props as pusher do the following
1) The curved side of the prop (where there are markings) always is pointing in front direction
2) The interchange any two wires in the motor so that it starts spinning in counter clock wise direction

 ;D ;D ;D ;D yipppeeee ;D ;D ;D ;D.  
my plane flied today, it was awesome.
I was very happy & excited to see it flying.

I faced a few issue.
The plane was tilting to the left first (used trim to turn it back) & added, this is the first time i am actually flying an rc plane  :P 8-) ).
The plane was little tail heavy, always had the nose pointed slightly upwards. when i push it down a little & leave it, it remained stable. But when i gave throttle again, it pushed the nose up.

Sad part
 :banghead: :banghead: :banghead: I didn't have a camera to capture it(feel very bad, this was my first time flying added this was my own build)  :'( :'( :'(
the plane hit few coconut trees here & there, finally it took a hit on a coconut tree & fell down damaging the battery. that's where i stopped and came back home.

Though it took lot of hits, the plane was intact & the only thing i lost is the spokes on one side of the wing. The last time when i flewed was without the spokes  :giggle: that's when it took a hit & damaged the battery.

Congrats on the successful maiden  {:)}

This happens mostly when the thrust angle is not correct, you need a little down thrust  :thumbsup:

I already have the motor pointed little upwards, will try making little more upwards. Also i have fixed the plane & the battery is getting charged fine, so planning to fly it again tomorrow(will take video :)).

oh sorry i forgot that it's a pusher; in that case may be you have to much up thrust, making the motor angle more upward will only increase its climbing tendency. Check if your wing and horizontal stab are in the same plane, if the stab is good then decrease the thrust angle by a very small amount.

my horizontal stab plain seems to be little lower then the wing plain. Is that the reason for this?

no problem just make sure both planes are parallel, just reduce the up thrust a little and try tomorrow.

Thanks :D sunlikestar for the advice will try that tomorrow.

Also i have replaced the Aeoxon ESC with 70-80 amps hk ESC.
Cos the Aeoxon ESC was shutting down if i give 60% throttle & use ailerons at the same time. Also it helps in making the CG.

congrats on ur first flight well done.....

But sreedhar i couldn't find a proper ground to fly again. The ground i went yesterday is totally crowed with people playing cricket today. I went to INCP ground in kariyavottom, The security at the gate told i need permission to fly. We need to find a proper ground to fly  >:(.