X-20 Dynasoar

Here is the pdf below for the X-20 Dynasoar glider that I’ve flown by itself using E-6RC rocket motors and as the RC glider on the nose of the Titan II/dynasoar stack.  Note this was designed to use 6mm/3mm depron. This may mean you need to adjust slots for a different thickness or add more carbon to provide the right stiffness if you use a different type/thickness of foam. This model uses a faceted design, ie plates to approximate the shape, not actual curved surfaces. 32″ long, 20″ wingspan, 10.5-11 oz rtf.  Boost CG with loaded motor RTF is 9 5/8″ forward from the rear of the fuse at the motor mount centerline.

You’ll need to add a hatch to access the battery and decide where to mount rail buttons or lug.

I use a slightly tail heavy launch condition and slightly nose heavy glide and it works without having to shift balast.   I prefer a launch rail with guide buttons as there is no flex, if you use a launch rod, you would need a minimum 6′ 1/4″ rod to give proper liftoff speed.

Reminder that this was scanned full size, but printers normally cannot print to the edges, and they will shrink the image and put some border around it, this will yield a smaller than original print and may cause mis-alignment, make sure you turn off page scaling in the printer before printing, and that there is no scaling or auto-expand or fill to the sheets and that you print without borders.

When cutting slots and tabs, it is better to cut one side, then overlay it on the otherside and mark the tabs and slots, that way you are sure they line up perfectly. The plans are tracings of my parts but fitting may be required.

Build light, I’ve included carbon where it is needed for flight loads. I use velcro to hold the RX and battery in place as it allows easy changing out if needed.I don’t use clevis connectors, but use .039 music wire and Z bends that fit tightly and glue my servos in place. Less to fail or go wrong. there is zero slop and it is light and simple. If you have to splice your foam sheets, use blenderm tape on both sides to reinforce the joint if needed. I use great planes or dubro wing skids on the bottom of the fuse and this helps avoid landing damage. Please feel free to send me feedback on any issues or success you have.

dynasoarV2.pdf

 

Build photos here, that’s all I have documented, rest is up to the builder.

 

X-20 Build thread