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Old 12-21-2018, 02:26 PM
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airdave airdave is offline
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Paper Model Gliders

This has turned out to be fun a project for a couple of reasons...
one, because I enjoy digital art, and creating these flat 2D profiles is a lot of fun,
and two, because it gets me back in to working in Coreldraw.
I have been avoiding work, and not getting anywhere with projects lately.

So, for those who don't know, Miles asked for someone to repaint a Mustang Glider model to look like a Tuskegee Airmen aircraft.
Easy Tuskegee Airman Plane

I wasn't thrilled about the idea of just repainting someone else's work
...easier just to design something new!
And thats what I did!!



You'll notice I avoided an actual Tuskegee Airmen P51D, and went for a tribute design.
I call it the "Tuskegee Flyer".

Miles stipulated that this model was for a classroom project,
and the young kids involved only had about 20 minutes to work on these models.
So, my goal was simplicity over scale accuracy or flyability.
Hopefully it will work for Mile's project.

It does fly...but with help.
(I'm told every paper glider is this way)
I found adding some nose weight helped a lot.
And then of course you can experiment with cutting and bending flaps and ailerons.




I've got a few more ideas in mind, for more Paper Gliders.
This is a whole new Collection!

These will be free downloads on my website, when i get everything sorted...stay tuned.
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Old 12-21-2018, 02:28 PM
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AS I said...I have more Gliders in mind...

I enjoyed designing the aforementioned Mustang Glider so much,
that I immediately dug up my old Tutor artwork and started on a Tutor Jet glider (using the same design ideas).

Same idea for wing attachment, same elevator fit, same scale, same artwork style.



Funny thing is, this one actually flies!!

Well...it glided a lot better...and when I added a bit of weight to the nose, it soared straight and level across the room!

I have a feeling its the high mounted elevator.
But the wings also have a slight upwards angle of attack that the Mustang doesn't have.






Watch for the Tutor Jet and the Mustang models in the New Year!
I'm wrapping up a third design already!!

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Old 12-21-2018, 02:30 PM
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Do hope you do some jets. Thanks for taking this up.
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Old 12-21-2018, 03:29 PM
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Those are good-looking gliders, Dave!

Don
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Old 12-21-2018, 04:05 PM
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Cool. I bet it would help the flyability greatly if you added a bit of camber to the wings. A couple of span-wise score lines with maybe 5 degrees of bend at each score should do the trick. I know that made the difference when I was playing around with making gliders from aluminum soda cans several years ago.
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Old 12-21-2018, 05:54 PM
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I have been trying with each design, to install the wings at a slight upward angle.
I figured more angle of attack would help with lift.
But all the models are stalling...too much lift?...and all require weight to keep the noses down and the flight level.

But I am under the impression this is the best method of approach,
since it is only possible to add weight to the nose...not take it away.
The next step in controlling the pitch, would be elevator action.

re your camber idea...
Since the wings are straight/level at the fuselage, it would be hard to maintain the curve in the wing...?
And what exactly would the would camber do?...add more lift? (which we don't really want).

Not being argumentative...I am honestly curious about the camber idea.
My first design, copied the curved (cambered) wing shape (thru-the-fuselage attachment)
...but it did not fly at all! It immediately dropped and twisted out of control.
The flat wing has worked a lot better.

Hey, I'm no expert on paper planes or gliders.
The best I have ever done, to this point, is assemble someone else's glider
or fold the basic paper airplane!
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Old 12-21-2018, 07:38 PM
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I would try cutting a small notch in the wing attachment tab directly underneath the score lines. Giving it a bit of an airfoil is usually better than the flat-board-in-the-wind approach. Some nose weight is usually needed in just about any glider design,,,need to get the center of gravity about a third of the span back from the wing leading edge. I've found that the crease acts much like a spar for strengthening the wing.
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Old 12-21-2018, 09:16 PM
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Dave,


I love the simplicity and the idea of a glider. To top it off they look fantastic.



Not being an aeronautical engineer, I'll keep my comments about improving flight to myself.


Gary
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Old 12-21-2018, 09:27 PM
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Leading edge droop

Quote:
Originally Posted by Darwin View Post
I would try cutting a small notch in the wing attachment tab directly underneath the score lines. Giving it a bit of an airfoil is usually better than the flat-board-in-the-wind approach. Some nose weight is usually needed in just about any glider design,,,need to get the center of gravity about a third of the span back from the wing leading edge. I've found that the crease acts much like a spar for strengthening the wing.
Yep, drooping the leading edge like the big boys do might work nicely. There must be some math behind that.
Once Dave releases some, all kinds of experiments will likely develop for these particular platforms. There might even be a whole thread on performance tips and tweaks. Wouldn't be the first time I trashed some gliders thinking I had discovered the holy grail of sink rate . Some day, I will tell you the story of when a flight instructor cut the power on a 172 on approach to show me how the glider guys did it .


John
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Old 12-21-2018, 11:55 PM
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At the Reynolds numbers at which these things are operating it has been found ... etc ... etc ...
Yes, for this size, flat plate is less complicating than camber, that's experimental rather than mathematical
Set the wing at 2 - 3 degrees and the tail at 0 degrees and don't stray far from that.
Nose (or tail) weight as needed to bring the centre of gravity to about a third of the chord back.
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