Mongrel (oz8641)

About this Plan

Mongrel. Sport radio control model. Wingspan 60 in, for .40 engines and 4 function RC.

Quote: "Mongrel was conceived, if that is the right word, while recovering from a bout of something or other, when leafing through aircraft books I was rather impressed by the looks of the Beagle Pup. In fact the design started out as a semi-scale version of that aircraft, but using a pair or wings I already had on hand in the workshop. The result, howevere has a definite Cherokee front end, and a Beagle rear end - so 'Mongrel' it became.

The model has very forgiving characteristics and should make quite a nice advanced trainer, as a change from all the usual high wing boxes. But do note the word 'advanced'. As regards construction, this itself is not too advanced, and if you have built two or three models, you should not find building presents too many problems.

CONSTRUCTION: Wings: Make up the four wing panels from 1/16 x 3 in sheet balsa, leave to dry and make a pair of tip and root templates from 1/16 ply. Sandwich the requisite 13 blanks of 3/32 sheet between the templates and carve and sand the resulting 'block' to profile, to give ribs. Repeat this process for the opposite wing. Assemble the ribs over spars pinned over the plan, on the building board, packing the ribs under the trailing edge and angling the root ribs as shown. Next add the top spars, false leading edges and trailing edges, checking the panels for alignment. Cut slots in the ribs for the 1/8 ply braces, shape the leading and trailing edges to the rib profile, add the top 1/16 panels and also slot these for the ply braces.

Remove the structure from the board, shape leading and trailing edges and add the bottom panels of 1/16 sheet, slotting for the ply braces. Now trim off the excess sheet and add the leading edge, finally thaping and sanding each panel. Fit the tip blocks and shape them to profile.

Cut out the sheeting on each panel to receive the servo box, then join the wing panels, propping them up for 2 in dihedral under each tip, fitting the ply braces to the top and bottom of the centre section.

The undercarriage mounting block is made up from lin. and in. ply, as shown. Mark its position on the underside of the wing, cut out and slot the three centre ribs to receive it, and assemble it in position with hardwood blocks, making the underside flush with the wing..."

Mongrel from Radio Modeller, December 1976.

Direct submission to Outerzone.

Supplementary file notes

Article, thanks to RFJ.

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