Card Stock & Paper Twin Fin Delta Airplane

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Introduction: Card Stock & Paper Twin Fin Delta Airplane

About: Airplane enthusiast and dream aviator.

I used to avoid delta wings, but lately I've been having a lot of fun with them. If nothing else, they have a compelling look! The design at hand is quite simple. It will take 45 to 60 minutes to make.

This glider is best suited for straight flights and should be thrown in calm conditions. I encourage you to use it as a starting point for your own designs. The wing shape could be easily altered; the two fins could be replaced by a central fin; you could add a tail extension; and so on.

It took a while to get this glider right. The first two attempts did not fly well at all, so I shifted to more conventional wing designs. After days of disappointing tests, and many versions, I looked at the original little purple shuttle, smiled, and returned that concept. It worked!

Supplies

-Sheet of card stock (8.5" x 11", 65 lb.) [see comments for metric conversion; thank you, Peter J.]

-Sheet of paper (8.5" x 11")

-Large vinyl coated paper clip

-Glue stick & liquid white glue

-Scissors

-Hobby knife

-Ruler

Step 1: Print and Glue

Download the PDF file. Print the plans at 100% scale on the sheet of paper. Cut the shapes out, but only approximately. Use the glue stick to adhere them to the sheet of card stock. (Alternatively, if you have a printer that handles heavy card stock, you can print directly onto that; I have not tested this, and it may adversely affect the glider's balance and flight.)

The glue will cause curling, but that's okay. Most of the pieces can be straightened by just working them with your fingers. The main piece does not need to be completely flattened. In fact, it's helpful if the wingtips remain slightly raised.

I've added a JPG in case it is useful to you. Check the comments for some good ideas!

Step 2: Cut Out the Shapes

Be careful and patient with this step! Most of the cuts can be made with scissors. You can use the hobby knife to poke the ends of the very thin strips (such as the two points indicated above) in order to remove them, and to make cuts where there are tough angles.

Step 3: Define the Creases and Angles

Before starting any crease, think about which side you want to have showing (paper or card stock), and orient the piece accordingly. Carefully line up the dotted line with the edge of the ruler, and push down or pull up, depending on how its oriented. The center of the wing is quite long and you may need to approach it in steps. The wing tips should be about 10 degrees above horizontal.

Step 4: Make the Nose/Fuselage

Add a couple drops of glue to one of the tabs. Use a scrap of card stock to spread it into a thin and consistent layer. Wrap the opposite tab over and pinch the two together. Repeat with the other pairs of tabs. The side pieces, which match the profile of the nose, can be glued on later. If you know you will only be flying indoors, you may not need those extra pieces. They add useful nose weight and durability.

Step 5: Attach Wing Braces and Fins

A glue stick is good for attaching the wing braces, but you should use liquid glue for the fin pieces. The wing braces will line up with reference marks, and all you need to do is apply pressure across each piece to ensure it bonds. The fin tabs can be attached to the main piece first, to the fins first, or in some combination, but you should first test fit the fins to make sure they interlock easily with the main piece. You may need to widen the slots a tiny bit.

Step 6: Final Assembly

Curl down the leading edges of the wing a bit. You can do this by repeatedly pinching with your thumb and fingers, using the curve of your fingertips to shape the material. You can also do it by repeatedly pressing and sliding the piece over the edge of a table (while being careful not to damage the fins). Use the pinching technique to flatten the trailing edges, or curl them down ever so slightly.

Test fit the nose/fuselage piece and the main piece, and widen the slots if necessary. Once together, use some dots of liquid glue at the seems to secure the pieces. Slide the paper clip in from the front and clasp it to the wing tab. Depending on the final balance of the plane, which will vary with different materials and glue, the clip should protrude by about 1/8" to 1/2".

Step 7: First Flights and Trimming

Adjusting weight and control surfaces is called trimming. It is a delicate process, so you should conduct the first flights indoors. It is also important that you throw the delta as consistently as possible—straight, level, and gently.

The glider should fly for about 20 feet, gaining a bit of altitude before descending steadily. If it is pitching up too much, bend down the center control tabs located at the trailing edges of the wing. Adjust them in very tiny increments. If the problem continues after several adjustments, you can also bend down the elevons (the outer control tabs of the wing) and/or position the paper clip farther forward.

If the glider is veering to the left or right, compensate with one or both rudders (on the fins). Angling a rudder to the left will nudge the glider's flight to the left, and an angle to the right will nudge it to the right. In theory, the elevons can induce a roll to the left or right, but I haven't found them to be very effective; the inherent stability of the dihedral and convex main piece probably cancels them out. Nevertheless, you can experiment with their influence on roll by adjusting one up and the other down.

Remember that this is a small and light glider that is very easily effected by a breeze. You can expect some rolls, stalls, nosedives, and other catastrophes when flying outdoors. A light tailwind, though, is helpful. Good luck!

Step 8: Video [optional]

In case you want to see some flights and clips of the build, check out the video.

1 Person Made This Project!

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15 Comments

0
dummy1977
dummy1977

1 year ago

Such a great little glider, and the video was very well done. Love the choice of music.

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zdedesigns
zdedesigns

Reply 1 year ago

Thanks for the encouragement!

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JohnC430
JohnC430

1 year ago

COOOOOOLLLLLLLLLLL!!!!!!!!!!!!!!
Thanks for sharing

0
zdedesigns
zdedesigns

Reply 1 year ago

You're welcome!

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PeterJ155
PeterJ155

1 year ago

For those using metric, 65lb is equivalent to 175gsm.
The PDF fits on A4.
Many ink jet printers can handle the card stock directly, so no need for the first step if you have a suitable printer.
You can extract the image from the pdf into, say, a jpeg and then use an editor such as Photoshop or Gimp to add colour, the fins and wing braces for example, before printing onto card.

titan_delta_plans_ZDE_2T.jpg
0
zdedesigns
zdedesigns

Reply 1 year ago

Thanks for the conversions, Peter! I wold love to see some colored versions of this delta. ... I will revise the instruction to include the information. Just note that when printing directly onto card stock, a heavier weight (than 175 gsm) should be used.

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PeterJ155
PeterJ155

Reply 1 year ago

I also just found that 175gsm card is nominally 0.20mm thick. This may help those who want to feed card through their printer. Most printers specify the maximum thickness / gsm they will handle.
I used 175gsm to build one and it seems OK, indoors at least.

0
alisetty999
alisetty999

1 year ago on Step 1

What time it remains it ramins floated in air ?

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Ghloo
Ghloo

Question 1 year ago

That is noce! One thing, tho, would it be stiff enough to launch with a rubber band? I would think so, after all, there are all kinds of rubber bands ... and one can always add a thin carbon tube for added durability...

0
zdedesigns
zdedesigns

Answer 1 year ago

Thanks! Yes, I think it is rigid enough, but it's not very good at transitioning from a launch to a glide, so you might get some spectacular nose dives and few graceful descents. : )

0
Ghloo
Ghloo

Reply 1 year ago

Yep, that is what I would think, But perhaps a small soft one to give it a gentle kick upwards ... worth trying. But overall, for indoors your glider looks cool enough!

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starguywisc
starguywisc

1 year ago

Are both the white & green card stock?

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zdedesigns
zdedesigns

Reply 1 year ago

Thanks for your question. The white is printer paper. The green is 65 lb. card stock.

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Penolopy Bulnick
Penolopy Bulnick

1 year ago

This is fun! And it could make a good Green entry for the Colors of the Rainbow Contest :)

0
zdedesigns
zdedesigns

Reply 1 year ago

Cheers! ... I don't know. Not quite green enough, me thinks.