Pixie Major (oz12169)
About this Plan
Pixie Major. Wingspan 57-1.2 in, for 3 channels and 2.5 cc diesel.
Quote: "Pixie Major. Colin Topps took Keil Kraft's famous 'Pixie' design, sized it up and added R/C.
Many readers have asked us for larger models as full-size pull-out plans - so here's one! We offer you the fuselage this time and plans for the flying surfaces next month. Don't miss them! Pixie Major is published with the kind permission and cooperation of Keil Kraft.
The idea of designing an enlarged Kiel Kraft Pixie (oz1375) came to me whilst building the 23 inch rubber kit for my son Simon, and after reading about Peter Valentine's twice-size Eaglet (oz6798). This made me realise the practicality of the conversion of these old favourites. So ten months after the original idea and after several mods to the prototype, here is the fruits of my labour and a little beauty she is too.
I decided to make the model suitable to take standard size three-channel gear and a PAW 249R/C diesel engine, so went for a 2.5 times enlargement, making the finished model 57.5in span. Using the PAW allows the standard silencer to fit compeletely inside the cowling so no unsightly large dustbins sticking out the side. I did, however, opt to have a 5/8 in prop extension sleeve machined for the engine for two reasons: First I was concerned the model might prove nose heavy, so with the engine further back this would help. Second, it would give safer access to the carb for priming and safer operation of the compression screw, bearing in mind that the engine is inverted. I have found no problems with this setup and the PAW starts easily and runs a treat; it is also very quiet. PAW will make the extension for you, mine cost £8.00 inc postage, but no doubt this price has increased and a call to PAW first is recommended.
Construction conforms in essence to the original rubber model. On the prototype the original wing has been retained but the dihedral reduced and 1.5 degree incidence built into the tail mount. A small reduction in wing incidence, however, is recommended and so the plans have been drawn with three degrees incidence and not four as the original free flight model. To achieve ROG take-offs the position of the wheels had to be moved rearwards by 35 mm from their true position. My prototype finished with an all up weight of 3 lb 8 oz.
I must add that whenever I take the model to my club's flying site she attracts quite a lot of interest and many admiring looks. So if you fancy building one, read on.
Fuselage: As the glazed cabin area is quite large and open for a model of this size it is recommended to either paint or cover the inside structure around the cabin area with your chosen finish. (It adds considerably to the overall looks of the model). If you decide to do this I recommend you do as I did and cover the inside as you build up the fuselage. I covered the inside with Solartex.
Build one side frame from 1/4 in sq balsa directly over the plan, pinning all members to your building board. Add former F4 to the cabin top, the sheet balsa infill panels and all gussets. Once this is dry place a sheet of polythene over the frame and build another directly over the first. Remove from the building board and join the two halves with F5 and F6, using epoxy. Make sure the two sides are square to each other. When set, glue the rear together and add all the formers and 1/4 in sq cross braces rear of the cabin. Now add F4A, F13 & F14 to the centre section so you end up with a 1/8in rebate all round the inside for the top removal hatch. Insert the ply brackets for supporting the 'X' removable bracing which is kept in place by dress snap studs cyanoed in place.
Forward of the cabin add formers F1, F2 and F3, the spruce undercarriage mounts and 118in sheet balsa. I highly recommend the use of spiked nuts for fixing the undercarriage. Now add the tank floor followed by the engine bearers. If you prefer to mount the engine direct to the bearers then use larger section ones than on the plan and adjust spacing accordingly..."
Direct submission to Outerzone.
Quote: "Pixie Major: Colin Topps' 2.5x RC version of the Kiel Kraft stick and tissue classic! Spread over two months of Radio Modeller free plans from October and November 1989 it comes out as two big sheets. The plans are really well drafted for freebies and hopefully someone will be tempted to make an electric version!"
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