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« on: February 08, 2011, 02:58:44 AM »
azhaguvel
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I am new to this hobby & this is my first built so dont mind about the poor build  Roll Eyes

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 Huh? Help Me

08022011402.jpg
cheap built pusher
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« Reply #1 on: February 08, 2011, 03:09:29 AM »
azhaguvel
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I would be very happy if experts in this form put a cheap built like this, with common available materials.

08022011407.jpg
Re: cheap built pusher
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« Reply #2 on: February 08, 2011, 08:17:55 AM »
speedracer
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i cant help you but i can sirely appriciate your work
nicely done.
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« Reply #3 on: February 08, 2011, 08:43:59 AM »
azhaguvel
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Thanks speedracer Smiley
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« Reply #4 on: February 08, 2011, 08:57:04 AM »
azhaguvel
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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.
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« Reply #5 on: February 09, 2011, 07:02:16 PM »
avijit17basu
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HOW DID IT FLY?
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« Reply #6 on: February 09, 2011, 08:43:17 PM »
azhaguvel
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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.
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« Reply #7 on: February 09, 2011, 09:45:32 PM »
prateek13
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« Reply #8 on: February 09, 2011, 10:11:20 PM »
medicineman1987
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Hey, sweet model.. Love the super simple design.. I'm sure the Aircel people will be happy with you for all the free publicity.. Smiley Wish you best of luck with your test flight.. Thumbs Up
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« Reply #9 on: February 10, 2011, 12:04:55 AM »
KALYANPRODHAN
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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?
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« Reply #10 on: February 10, 2011, 12:11:54 AM »
azhaguvel
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Thanks prateek & medicineman.

@ Kalyan

            This model doesn't have a rudder Wink. 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).
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« Reply #11 on: February 10, 2011, 12:13:56 PM »
azhaguvel
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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
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« Reply #12 on: February 10, 2011, 02:18:32 PM »
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RD props are similar to SF prop (they might be same aswell Roll Eyes), these work best on low kv motor, DD are suitable for high kv motor.
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« Reply #13 on: February 10, 2011, 02:48:51 PM »
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RD props are similar to SF prop (they might be same aswell Roll Eyes), 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.
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« Reply #14 on: February 10, 2011, 06:42:04 PM »
azhaguvel
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Please correct me, i might be wrong  Roll Eyes.

yes i am using a prop saver  Tongue
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.
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« Reply #15 on: February 14, 2011, 11:30:14 PM »
azhaguvel
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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.
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« Reply #16 on: February 15, 2011, 07:29:23 PM »
azhaguvel
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 Help Me Help Me Help Me
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.
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« Reply #17 on: February 15, 2011, 08:56:49 PM »
anwar
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Looking from behind the prop, certainly a bit to the right, and a small bit down. The right is the most important aspect.
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« Reply #18 on: February 15, 2011, 09:13:20 PM »
azhaguvel
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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.
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« Reply #19 on: February 15, 2011, 09:15:47 PM »
anwar
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Oops, my bad... I forgot the fact this is a pusher Bang Head

See this : http://www.rcindia.org/beginners-zone/mounting-motor-for-pusher-prop/
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« Reply #20 on: February 15, 2011, 09:21:44 PM »
azhaguvel
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So, is up->left ok?
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« Reply #21 on: February 15, 2011, 09:50:05 PM »
anwar
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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 Wink

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 !
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« Reply #22 on: February 15, 2011, 09:59:32 PM »
anwar
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BTW, you said your prop is rotating clockwise, looking from behind. Not sure that sounds right, if you are using a true pusher prop.
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« Reply #23 on: February 15, 2011, 10:05:59 PM »
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Azha, wish you all the very best for the maiden. We are all rooting for you. Well done!
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« Reply #24 on: February 15, 2011, 10:22:30 PM »
azhaguvel
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chees.. thanks VC  Grin

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