Baby Biwinger (oz13924)


Baby Biwinger (oz13924) by Lud Kading 1952 - plan thumbnail

About this Plan

Baby Bi-Winger. Simple all-sheet free flight model, for K&B Infant engine.

Lud Kading's 1952 design, from Air Trails, April 1952. Later also reprinted in Flying Models, 2013.

Quote: "Originally for the K&B Infant. Ink tracing by Daniel Walton, with mods for Cox Tee Dee .010"

Note this plan is a free download from the Flying Models site at: where it appears along with lots of good build pics and the full text of a build article by Daniel Walton, originally published in FM, May 2013.

Quote: "Baby Biwinger R/C Conversion. Relive those good ole’ days without risk of losing your model with this easy micro R/C conversion! By Daniel Walton.

Back in the July 2012 issue of Flying Models I had speculated on the possibility of an RC conversion of the Baby Biwinger model aircraft FF design. I figured using newer technologies available along with carefully selected materials, a judicious redesign of certain structural elements and a very aggressive weight reduction program would yield a RC conversion of the original 13-inch span model.

With changes to reduce the weight by at least 50% for the airframe and appropriate mods to allow for a proper CG with the lighter weight propulsion unit (8.7 grams for the electric motor and prop vs 18 grams for the Cox Tee Dee .010) was indeed possible.

On December 8, 2012 I was able to successfully fly for the first time one possible solution to this design problem with very satisfactory results. The new model flies very much like the Ember 2 which is where the receiver came from (only three channels were needed) and used the gearbox/motor from a ParkZone P-51 (PKZ3624) and a GWS 5034 prop and adapter spinner..."

Update 3/7/2022: Added original 1952 article, thanks to RFJ.

Supplementary file notes



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Baby Biwinger (oz13924) by Lud Kading 1952 - model pic

  • (oz13924)
    Baby Biwinger
    by Lud Kading
    from Air Trails
    April 1952 
    13in span
    IC F/F Biplane Cabin
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 17/01/2022
    Filesize: 1128KB
    Format: • PDFbitmap
    Credit*: Pilgrim, RFJ
    Downloads: 498

Baby Biwinger (oz13924) by Lud Kading 1952 - pic 003.jpg
Baby Biwinger (oz13924) by Lud Kading 1952 - pic 004.jpg

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User comments

Here are some photos of the Baby Biwinger [main pic, 003, 004], which I built when the plans were published in Flying Models magazine. The plane is overpowered with the Tee Dee .010 engine. I later added an exhaust restrictor similar to the one in Bill Hannan's Rex Racer (oz8162). This reduced the power enough to make it flyable, but flights are still pretty exciting. This is a really fun model.
WalterK - 03/07/2022
My brother, Andy Kunz. There are dozens of OZ uploads from him. I remember the day when he flew this model, off into Oblivion, never to be seen again, on its maiden voyage. I am going to build one, this time from meat tray foam, and with RC so I get it back, to commemorate the occasion, which took place back some year in the 1970's.
Michael P Kunz - 06/09/2022
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