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Old Jul 02, 2008, 01:59 PM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,523 Posts
Discussion
piPlane (Because It's Round)

A few people have showed an interest in my little round UFO-type (thanks GPW!), so here is a guick build-guide.

This is a really fun plane to throw in the back of the car to fly practically anywhere.

Indoor Video:

http://www.rcgroups.com/forums/showt...1#post10143610

Build sequence:

1. Cut an 18-inch diameter disc from Bluecor.

2. Cut and hinge elevons with Scotch tape (over-under method).

3. Cut upper fuselage from Bluecor.

4. Cut and hinge rudder with Scotch tape (over-under method).

5. Glue upper fuselage onto disc.

6. Mount elevon servos.

7. Mount receiver.

8. Mount rudder servo.

9. Cut lower fuselage from Bluecor.

!0. Glue lower fuselage onto disc.

11. Mount motor to small piece of 1/32 ply. I used 1.3 X 1.3 inches.

12. Glue motor mount to front of disc.

13. Mount ESC on right side of lower fuselage using hook and loop (Velcro).

14. Install control linkages.

15. Adjust throws for at least 30 degrees travel each direction (45 or more, if you dare).

16. Attach battery to lower left fuselage (opposite the ESC) using hook and loop.

17. Balance at 25%.

18. Go fly !

Equipment:

E-Flite Park 300 outrunner
9/4.7 SF prop
tiny servos
tiny receiver (I like Berg 4L or Spektrum 6100E)
tiny ESC (CC TB-6 or TB-9)
tiny battery (2S 300 to 620 LiPoly)

Yes, you can add landing gear; I prefer to save the weight

Have FUN !

Gary
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Last edited by sr71fan; Jul 14, 2008 at 11:00 AM.
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Old Jul 02, 2008, 03:39 PM
KZ RIDER
raythomas's Avatar
Confederate States of America
Joined Nov 2001
1,035 Posts
SWEET

I have a question or two.
If you have elevons on it, whats the rudder for?
In the side view the elevons are drooped. Is this to make it like a slowfly highlift airfoil for slow flight?
I thought anything that had elevons neede a small amount of reflex (up) in the elevons.
Great design and fun I bet.
If you had the time, could you give us a heads up on how you made and mounted your LED'S ????
I can hear my neighbors on the phone now!!!
"Sheriff, you gotta get out here, its a UFO I tell ya" ha ha ha ha
Thanks Ray
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Old Jul 02, 2008, 05:06 PM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,523 Posts
Ray,

Elevons only control pitch and roll. The rudder controls the yaw axis.

The elevons are drooped because they got knocked around during transport. They are slightly up when flying.

For the lights, I tap off +5V and - (ground) from the receiver, and run two wires all the places I want lights. Solder the LED (with a 100 ohm 1/8 watt resistor) between the two (observing proper polarity), and tape them down. See photos.

Gary

P.S. Blinking LEDs don't need the resistor.
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Last edited by sr71fan; Jul 02, 2008 at 05:18 PM.
Old Jul 02, 2008, 06:34 PM
feel no remorse
youth must fly's Avatar
underground
Joined Jun 2004
1,184 Posts
here we go again
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Old Jul 02, 2008, 07:09 PM
Registered User
leebospeed's Avatar
Yorkshire, UK
Joined Dec 2006
72 Posts
I just could not resist!

Hi Gary,

Hope you dont mind but i did a pdf for everyone!

All the best,

Leebospeed.
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Old Jul 02, 2008, 07:26 PM
Sopwith Camel's Cousin
Between my tx and crashed aircraft
Joined Mar 2006
3,783 Posts
Quote:
Originally Posted by sr71fan
...
Elevons only control pitch and roll. The rudder controls the yaw axis.
...
Useful for a maneuver where the roll and rudder go in 'opposite' directions: one such maneuver is a flat turn:
the rudder turns the plane, but the elevons roll to the outside of the turn
so that the wings stay level during the turn: can make for a very tight turn.
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Old Jul 02, 2008, 08:06 PM
Registered User
Joined Feb 2007
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Howe does it compare to the Itza?
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Old Jul 02, 2008, 09:14 PM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,523 Posts
'Bout the same.
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Old Jul 02, 2008, 09:18 PM
John 3:16
Daddy-O's Avatar
Dom. Rep.
Joined May 2003
3,825 Posts
That is a very nice, controlled-flying video. Congratulations on a good flying, fun plane! Thank you for putting it up for all of us.

Daddy-O
*EDIT* The shape of the fuse in the video looked kind of like a bean. The flying bean!
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Old Jul 02, 2008, 10:31 PM
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thermal's Avatar
Maryland's eastern most shoreline
Joined May 2004
566 Posts
Are you running all the LED's in the video from one unused channel on your receiver? It really looks great!
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Old Jul 02, 2008, 10:38 PM
KZ RIDER
raythomas's Avatar
Confederate States of America
Joined Nov 2001
1,035 Posts
Quote:
Originally Posted by sr71fan
Ray,

Elevons only control pitch and roll. The rudder controls the yaw axis.

The elevons are drooped because they got knocked around during transport. They are slightly up when flying.

For the lights, I tap off +5V and - (ground) from the receiver, and run two wires all the places I want lights. Solder the LED (with a 100 ohm 1/8 watt resistor) between the two (observing proper polarity), and tape them down. See photos.

Gary

P.S. Blinking LEDs don't need the resistor.
Man I been on this site since it first began.
And I bet I've read every thread and post on HOW TO LED'S.
And you got it all down to one picture.
You are a GENIUS!!!!!!!

So what your saying is the plane will fly with elevons only? And you
just use the rudder for flat turns?

Thanks Ray
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Old Jul 03, 2008, 12:44 AM
Flying...Pushing Air Down
sr71fan's Avatar
Clovis, NM, USA
Joined Nov 2000
3,523 Posts
Thermal,

Yes, all the LEDs are powered by the receiver 5 Volts. I don't have a spare channel on this one, so I just tapped the rudder channel connector by soldering the wires to the pins under the servo connector. You could use a Y-connector, but I was trying to save weight.

Ray,

I did not say I use the rudder only for flat turns. I said it is used for yaw. That includes any time you want to move the nose left or right. Comes in really handy while hovering. Very effective in harrier, too. Yes, you can fly the plane with elevons only, but I would rather have rudder and elevator than no rudder and elevons. To each his own, I guess.
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Old Jul 03, 2008, 06:16 AM
gpw
“There’s no place like Foam”
gpw's Avatar
Joined Jul 2002
23,986 Posts
We've been having so much FUN with the Itza' (Thanks SR71) This one is just so Cute !!! We'll have to make one ...
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Old Jul 03, 2008, 06:41 AM
Hi I am Mark & I am an addict
mthomas's Avatar
USA, KY, Louisville
Joined May 2007
790 Posts
This is completely awesome.. thanks for posting. I do have one quesiton about hinging... what exactly is the over/under method? Isnt' that just regular singular sided tape?

Mark
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Old Jul 03, 2008, 07:23 AM
Registered User
DRITCH's Avatar
ST.LOUIS
Joined Aug 2006
1,999 Posts
slightly technical question.

Got the resistor part and power supply.

1. Do you hook up the led's in series or parallel in the whole circuit. Can't quite see it in the pics?

2. Are the led's rated for a certain voltage/wattage?

3. Radioshack?

4. Love the plane.
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