Fox Mk II (oz7514)

About this Plan

Fox Mk-II. Radio control sport model for .25 to .32 power. Foam wing model, has 371 sq in wing area.

Quote: "The latest Fox is the end result of more than a decade of refinements. The 49.5 inch span foam wing model has a 371 sq in wing area and employs an NACA-0012 symmetrical airfoil section set at 0 degree incidence. Dihedral is 6 degrees, that is 3 degrees per wing panel. The dry weight is 48 oz and the wing loading is a moderate 18.6 oz/sq ft.

The model is designed for .25 - .32 size 2-stroke engines and requires a 3-channel radio for throttle, ailerons, and elevator. The receiver and servos are standard, the battery pack is a 250 mAh. No dual rate, mixing or exponential control is needed. A good power-to-weight ratio combined with low wing loading and the absence of landing gear make this model easy to hand launch and a joy to fly. Top speed is 100 plus mph depending on the engine, propeller, and fuel used.

This design could be a good club project for fun or for Club 20 pylon racing. The model is an updated version of my Fox (oz7859) design published in the June 2001 issue of RCM.

Construction Notes: I feel that a step-by-step, construction sequence is not needed since this design is elementary. The basic building materials are foam, balsa and plywood. Make sure all parts fit well and the glue joints are good. To build and finish two of these models simultaneously takes approximately sixty hours of construction time.

Wing: You can cut your own, or you can purchase foam wing cores. Computer-cut foam cores are available from IDL Model Systems, phone: (818) 909-0306, Wbbsite: www.tdlinfo.com

Glue the 1/4 x 3/8 oversized balsa sub-trailing edges to the foam cores with an aliphatic glue. Sand the sub-trailing edges flush with the foam cores. Carefully align the cores and cut the slots for the 1/8 lite ply dihedral brace. The wing cores are sheeted with 1/16 Sig contest balsa. The sheeting is attached with Southern Sorghum contact cement. Sand the roots to the proper dihedral angle. Install the leading edges, trailing edges, ailerons, and wingtips on each wing panel and then glue the panels together with aliphatic glue..."

Supplementary file notes

Article pages, text and pics, thanks to KraftyOne.

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