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The MiniFD



MiniFD = ET's Mini Flying Disc

After building my ETFD2 I scaled down the design to create the MiniFD.  It has four 5" props mounted in a 16" EPP foam disc.

See here for a gallery of pics.
See below for a parts list and videos.

The disc is made from a sheet of 9mm 1.9# EPP foam.  The openings are 5.75 inches in diameter, and the motors are about 230mm apart.  For the design I drew circle shapes in Photoshop and tweaked their size and position until it all fit evenly -- see here for PDF files.  The multiple-pages version can be printed onto standard 8.5"x11" letter-sized sheets, and the sheets trimmed and taped together.  (When printing, set "Page Scaling" to "None".)  I attached the sheets to the foam with double-sided tape and simply cut along the lines to create the frame.  (The outermost circles on the openings are the ones to cut along.)

The 0.9mm strips are glued (with CA) into the foam for support.  The 5.0mm x 0.6mm strips are used for the motor-mount supports, with these lengths:

motor-mount to motor-mount struts:  5-1/16" (5.0625")
motor-mount to disc edge struts:  3"

The three "legs" on the bottom are 1.5" tall, 0.75" square, and made from two layers of the 9mm 1.9# EPP foam.  The rear fins are made from the same EPP foam and painted blue for better orientation in flight, with the bottom fin also serving as the rear "leg".

I reversed the shafts on the 1811 motors to allow the props to be positioned in line with the foam.  The small grub screws on those motors need a 0.9mm driver.  That size can be hard to find; see here for a driver; this kit has it (also here).  I used a vice and the socket piece from a socket driver to push the shafts through to the other side.  Care needs to be taken not to bend the can.  The other grub screws need a 1.3mm driver.

In my build I connected the motor mounts to the 5.0mm x 0.6mm carbon strips with CA glue and thread, making sure that they were straight and level.  Using 3D-printed "joiner" pieces would probably work better, so I had a friend make some; see here for details.  I glued the
5.0mm x 0.6mm carbon strips to the foam with CA.

Weight without battery is around 200g.



Parts List:

9mm 1.9# White EPP Foam, 1 Sheet, Size 18"x36" [RCF001599] $8.25
http://www.rcfoam.com/product_info.php?products_id=1599

Carbon Strip 7.0mm x 1.2mm x 1000mm 20-112 $3.90
http://www.rcfoam.com/cart.php?target=product&product_id=708

Carbon Strip 5.0mm x 0.6mm x 1000mm 20-109 $2.30 (2)
http://www.rcfoam.com/cart.php?target=product&product_id=705

Turnigy 1811 brushless Outrunner 2900kv T1811-2900 $9.76
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8142

HobbyKing 10A ESC 1A UBEC 261000002 $6.52
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=21247
HobbyKing 10A ESC 1A UBEC (USA Warehouse) 261000002 $6.67
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=32010

5030 Propellers (Black) - 3xCW and 3xCCW - 6pcs per bag 9332000002 $3.49
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=22753

5030 Propellers (Red) - 3xCW and 3xCCW - 6pcs per bag 9332000003 $3.49
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=22754

Peel-n-stick foam tape. 10x5inch 4mm thick ST-FOAM-DB $1.29
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8999

5.6mm x 21mm M3 Nylon Threaded Spacer (10pc) 9171000016 $1.78
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=22734

Turnigy nano-tech 950mah 2S 25~50C Lipo Pack (USA Warehouse) 9210000005 $5.77
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=24220

Alternate Parts:

HobbyKing 6A ESC 0.5A UBEC 261000001 $6.73
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=21246

HobbyKing 6A ESC 0.5A UBEC (USA Warehouse) 261000001 $6.85
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=24526

Turnigy 1000mAh 2S 30C Lipo Pack (USA Warehouse) T1000.2S.30 $6.19
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=20820



MiniFD in the Norton Gym:




MiniFD Flipping in the Living Room:




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