Here’s the build details and some videos of my first flying wing built with the hot wire CNC machine.  I’ve called YMF-38 as its 38 inch wing span.  It uses MH-42 airfoil sections and uses a 2200KV brushless motor with a 6×4 prop.  A 2200mAH Lipo give about 8-10 minutes flying.  It flies really well and is quite fast.  I used XPS foam with 9gram servo’s.

The wing was designed in Profili Pro 2 which creates the g-code I then load into to Mach 3

My carriage distance is 32″ and the root of the wing is set at 6″ from the carriage.  The two downloads below are the actual gcode you send to the hot wire cnc machine.

Here are the dimension.  Center of Gravity is 6 1/4″ from the nose.  The end plates are 6mm depron which you can be any design you like.

ymf-38

Here’s the setting from Profili2 Pro

foam block settings

 

Here’s the placement of of the 3mm carbon rods.  I use a Dremmel with tile attachment to cut a slot and filled them with lightweight filler.  I then covered it in iron on Solar film.  The battery is secured with velcro and a velcro strap that goes through the wing.  Launch is very easy because on the underside there is a small grip which you can hold and apply about 3/4 throttle and she leaps away. See  second video below the video’s below

ymf-spars

Here’s the finished YMF-38.  She flies extremely well and can really eat up the sky

flying-wing
The YMF-38 flying wing

 

Stupid Boy

I crashed it.  I’d forgotten to check my transmitter rates switches and the elevator was on a low rate setting.  Took off and thought this wasn’t right better land, but before I could it just wouldn’t pull up and I end up in a field of oilseed rape (canola) crop surrounding the flying field. Tried to find it but this type of crop it very difficult to get through when its almost ready for harvest, so I had to leave it. Damn.

Well after about 2 weeks the crop was cut and one of the other club members spotted it on his way home.  Everything still worked apart from one servo but I will not trust the receiver as the whole air-frame felt wet.  So time to make another.

New Hot Wire CNC Wing

This is the rebuilt wing I’ve used white foam and 3 carbon rods and then its been covered in brown paper and solarfilm.  Weight was 405 grams without battery and with a 3S 2200 mAh 608 grams.  The videos below show the search, recovery rebuild and Maiden flight.

  • Part 1 Crash, Search and Recovery, Foam cores made on Hot Wire CNC
  • Part 2 Spars, Joining and covering in Brown Paper,PVA
  • Part 3 Covering in Solar Film , Final assembly and Maiden Flight
  • Part 4 On board footage and some 4S Lipo Fun

 

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