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« on: June 20, 2011, 09:53:47 PM »
Swapnil
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This one's a total copy-paste of Vaibhav's plane with respect to dimensions.
http://www.rcindia.org/self-designed-diy-and-college-projects/first-flight/

Only differences are:
1) It's made of 4 mm coro + high density thermo,
2) Wing is flat-bottom aerofoil instead of flat,
3) It has a 160 W motor + 9*4.7 prop instead of a 120 W + 8*6 (in Vaibhav's setup).

This bird is certainly heavier than Vaibhav's but i hope the power setup will compensate for that.
Couldn't maiden it as it was raining/ windy all day, will try in the morning.

Questions:

1) The aerofoil has 1 in thickness at 1/3 chord. Will it make any significant difference as compared with flat-wing? (I've read in a post by Sai sir that aerofoils don't give much advantage over flat-wings for small models)

2)The servos are placed close to the elevons. How much will the position of CM have to be changed?

Many thanks to naatumach (Vaibhav Sharma) for the detailed plan.  Thumbs Up
Hope mine flies as well!  Smiley

a.jpg
Another PizzaBox
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« Last Edit: June 20, 2011, 11:33:06 PM by Swapnil » Logged
 

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« Reply #1 on: June 20, 2011, 10:48:10 PM »
naatumach
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Vaibhav Sharma



1.I have also read that airfoils dont make much difference in models.
But that is not entirely true. Try building one fuselage and two sets of identical wings, one with airfoil and one without. The airfoil makes the glide longer and sturdier.
And I believe that especially in my model which i has a less than one thrust to weight ratio, i feel that airfoil makes a difference.
2. Where ever you place the servos, just find the CG of the aircraft and place the 1/3rd line about an inch behind the CG. If the a/c nosedives reduce the distance, if it flares up increase the distance.

The closer you keep the Servo and the battery the better it will fly. The reason is that
There are three heavy components, 1.Motor 2.Battery 3.Servo.
Motor's is fixed. Battery is near the 1/3rd line, so its fixed too. So now you are left with the servos and the plane is balance. Now if the servos are of 10gm and is 1cm from 1/3rd line the torque induced is 10gm.cm and if its 10gm and placed 10cm away it'll cause a torque of 100gm.cm which will cause too much instability, so i recommend the servos be kept close to the 1/3line.

Regards
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« Reply #2 on: June 20, 2011, 10:55:13 PM »
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Wow that is one wierd looking plane. UFO Smiley Post vids too. Plan on giving it colour for visibility? since its more of a square.
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« Reply #3 on: June 20, 2011, 11:11:29 PM »
naatumach
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Vaibhav Sharma



It is actually a very common design.
If you taper the planform it will resemble a mirage, but its planform is designed for high speed.
To make it adapted for our purpose we make the have a low aspect ratio and viola you get the pizza box.
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« Reply #4 on: June 20, 2011, 11:20:29 PM »
naatumach
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It has a 160 W motor + 9*4.7 prop instead of a 120 W + 8*6 (in Vaibhav's setup).
How does one find out the Wattage of the motor?
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« Reply #5 on: June 20, 2011, 11:26:23 PM »
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Well, it's generally specified in the motor manual.
Also, Wattage = (max. voltage) x (max. current) .....
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« Reply #6 on: June 20, 2011, 11:41:09 PM »
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... Plan on giving it colour for visibility? since its more of a square.

Yup. How about all black? Or maybe black+silver?
It'd look more like a UFO then. Wink

Could also try adding a tractor-beam to kidnap pizzas! Grin
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« Reply #7 on: June 20, 2011, 11:41:43 PM »
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So my max voltage is 11.1V (3cell) and max current is 18A (ESC) ? so that makes it 199.8W?
Is this correct?
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« Reply #8 on: June 20, 2011, 11:43:56 PM »
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Oh no, you got it wrong!
It's the max. current of the motor you need to consider not that of the ESC (as we are calculating the motor's wattage).
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« Reply #9 on: June 23, 2011, 07:07:45 AM »
Swapnil
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Did some test throws. I don't know if one can use the term 'glide' for a plane with such dimensions, but it did go straight without dipping forward or backward.   
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« Reply #10 on: June 23, 2011, 08:27:03 AM »
naatumach
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Vaibhav Sharma



I think you're good to go. Yes one really cant use the term glide for it Tongue
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« Reply #11 on: June 23, 2011, 10:20:51 AM »
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The rain gods hate me!  Sad

All I could do with it indoors was paint and name it.
Now it's called 'The BugHunter' ! Cool

Pics follow...
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« Reply #12 on: June 23, 2011, 10:24:26 AM »
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Top view...

p1.jpg
Re: Another PizzaBox
* p1.jpg (46.05 KB, 583x535 - viewed 565 times.)
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« Reply #13 on: June 23, 2011, 10:26:21 AM »
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Upside down..

p2.jpg
Re: Another PizzaBox
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« Reply #14 on: June 23, 2011, 10:28:20 AM »
Swapnil
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some more...

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Re: Another PizzaBox
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« Reply #15 on: June 23, 2011, 10:30:25 AM »
Swapnil
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and this...

p4.jpg
Re: Another PizzaBox
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« Reply #16 on: June 23, 2011, 10:31:21 AM »
naatumach
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Vaibhav Sharma



is that paint or printed paper or textured paper?
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« Reply #17 on: June 23, 2011, 10:36:46 AM »
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Poster colours+paint+varnish+permanent markers...
I assure you, no 'printed paper or textured paper' was harmed during the paint job.  Wink Tongue Grin

I know it looks like a 6-year-old's work, but that's all I can do with colours! Wink Smiley
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« Reply #18 on: June 23, 2011, 10:40:45 AM »
Swapnil
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Wow that is one wierd looking plane. UFO Smiley ...

Well, I initially thought of naming it 'The Pizza-kidnapper from Pluto' or 'The JungleBoy'...but now it's 'The BugHunter'. Cheesy
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« Reply #19 on: June 23, 2011, 10:47:13 AM »
naatumach
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it looks good. shouldn't u hv flown it before you try to decorate it?
im getting too anxious to see it fly
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« Reply #20 on: June 23, 2011, 10:51:45 AM »
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The rain gods hate me!  Sad
All I could do with it indoors was paint and name it.

Rains man!
I 'decorated' it so that even if it doesn't fly, it'll make my wall look impressive! Smiley
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« Reply #21 on: June 23, 2011, 11:06:20 AM »
naatumach
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thats optimistic Smiley
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« Reply #22 on: June 23, 2011, 07:39:34 PM »
Swapnil
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Increased vertical stabilizer area as suggested by Vivek (Jatayu)....

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Re: Another PizzaBox
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« Reply #23 on: June 24, 2011, 07:40:53 AM »
Swapnil
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Took it out this morning.
Broke my first prop! Cheesy Cheesy Cheesy
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« Reply #24 on: June 24, 2011, 09:06:29 AM »
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WooHooooooo!
My BugHunter FLIES! Grin Grin Grin

Just did the maiden.
1) Went straght up at 30o
2) then 3 rolls
3) 1 loop
4) then hovered for like 3s
5) then a bad landing (bent prop adaptor base)

It was Super-Awesome!   Grin Grin Grin
(Anwar sir, can't we get a dancing smiley?  Grin)

A million thanks to Vaibhav (naatumach) and Vivek (Jatayu) for all their technical and non-technical help and for supporting me throughout. Really grateful to you guys!  Smiley Hats Off Bow Clap

And sorry guys, no video. Will do another sortie this afternoon on a paddy farm and record it.

PS: This was with a 10*5 prop and launched at 50 % throttle.
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