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Old Feb 20, 2015, 09:23 PM
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Corrugated-Cardboard Sailplane?

Hello, I want to build a 60 inch (1.5 meter) sailplane from scratch. I am a teenager who doesn't make money very quickly. I once read a book about a genius who builds a spaceship out of cardboard, so I wondered if a sailplane could be built out of such material. What do you all think?
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Old Feb 21, 2015, 02:12 AM
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A mockup maybe...

Too soft, too heavy.
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Old Feb 21, 2015, 07:16 AM
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Go to a building site or insulation company - beg / buy broken sheets of foam. That's your cheapest source of materials.

If you can, hot wire cut the foam. If not, with templates for accuracy, carve and sand to shape.
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Old Feb 21, 2015, 07:53 AM
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But first make a budget for RC and electronics
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Old Feb 21, 2015, 10:44 AM
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Fireball,

You didn't say what type of flying you intended to do with the plane, which will greatly impact the choice of design and material.

If you're looking for a slope plane, then corrugated plastic is a viable option. Check out the Corobat design here, based on a corrugated plastic wing and plastic baseball bat fuselage.

If you're planing on a thermal plane, then corrugated plastic is (as noted in others' posts) too soft and too heavy.

-- the markster
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Old Feb 21, 2015, 10:56 AM
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I'm sorry buzzfly, but I have no idea what a "slope" or "thermal" plane is… ME N00B
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Old Feb 21, 2015, 11:00 AM
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Quote:
Originally Posted by FallingFireball View Post
Hello, I want to build a 60 inch (1.5 meter) sailplane from scratch. I am a teenager who doesn't make money very quickly. I once read a book about a genius who builds a spaceship out of cardboard, so I wondered if a sailplane could be built out of such material. What do you all think?

Does it have to be 60 inch? Here are plans for a 48 inch wing that you probably can scale up:

http://www.rcgroups.com/forums/showt...4&highlight=KF

This plane flies great on the slope. Dont know about flat field. Could mount a pusher motor.

If you have money the Parkzone Ka-8 is on clearance for $99 shipped to your door BNF Spectrum. Thats pretty cheap since it includes 4 servos, 6 ch rxer, flight battery and charger, all you'll need is a Spectrum transmitter.

Good luck.
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Old Feb 21, 2015, 11:09 AM
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See if you can get some fan fold foam. What part of the world do you live in?

I have been toying with designing a slope plane from pizza box cardboard. Slope flying is if you have a hill/cliff/dune that faces a flat area and has wind blowing to the hill. It creates an updraft you can just fly a glider in indefinitely.

Ryan
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Old Feb 21, 2015, 11:10 AM
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Thanks ryan - I live in California USA.
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Old Feb 21, 2015, 11:23 AM
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I suppose I do not intend to fly slope, but rather at a flying field where I can hand-lauch the plane, take it up to the air with a decent brushless motor, go back and forth between powered flight and gliding, and then belly land it. (Or could I put retracts on it??)
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Old Feb 21, 2015, 11:24 AM
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Basically any cliff facing the ocean you can slope soar.


Torrey Pines slope soaring (3 min 27 sec)



This is an example with a high dollar glider but a glider from fan fold or cardboard could fly here too.

Ryan
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Old Feb 21, 2015, 11:26 AM
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Also, it wouldn't be completely made of corrugated cardboard and electronics - it would also have spruce spars and styrofoam inside the wing and fuselage, so they retain their shape.
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Old Feb 21, 2015, 11:33 AM
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Once again, I have no place to fly slope - but there are 2 nice flying fields that I know of in my area, so I would fly powered to keep the plane into the air and just glide the rest of the time.
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Old Feb 21, 2015, 11:43 AM
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Quote:
Originally Posted by FallingFireball View Post
Once again, I have no place to fly slope - but there are 2 nice flying fields that I know of in my area, so I would fly powered to keep the plane into the air and just glide the rest of the time.
Then build the KF Flytrap wing I posted a link to and add a brushless motor/ESC and lipo. The BL Motor/ESC and Lipo will cost more than the airframe.

This link is a Flytrap with a motor:

http://www.rcgroups.com/forums/showt...6#post30145313

Forget about landing gear if you build a wing.

The Flytrap wing can be built in an hour once you get all the parts together. You can build the airframe in 1/2 hour or less.

Can you fly RC planes or are you learning?
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Old Feb 21, 2015, 12:13 PM
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I can fly a 4-channel quite well, and I do not intend to build a flying wing - just a 60-inch-wingspan powered sailplane with an aspect ratio of 12 - but thank you anyway.
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