Super Fli (oz13817)
About this Plan
Super Fli. Radio control scale model. For OS 25 FP engine.
Quote: "Super Fli, by Keith Humber. A 44 in span version of this sporty little home-build by Phil Kraft for .25 power and 4 function R/C.
The Super-Fli was designed in the early seventies by Phil Kraft. He won the R/C World Acrobatic championships in 1967 with his famous Kwik Fli (oz6526) design, and represented the USA no less than three times in this event, but only won once. With a background like this he would have certainly known how to design an aerobatic model or full-size machine - hence the origination of the full-size Super-Fli. Construction of the aircraft was under-taken by Paul White, an employee of Phil's and took the 'Best In Class' award at the 1975 Oshkosh fly-in.
The Super-Fli design is virtually a large model with most of the Kwik-Fli features, i.e. thick symmetrical wing sections, flat plate tail and fin with large rudder and long moments, in fact everything a good R/C acrobatic scale model would be. Phil's Super-Fli model was (yes it is now defunct) powered by an OS 45FSR, spanned 58 in and was quite a flier. This leads me on to my version of the Super-Fli.
Looking for a replacement for my old Wight Wizard (oz11820), which is starting to show signs of wear (well it is about ten years old), I needed a .25 sized model for this winter. I had looked at the Super-Fli for quite a while as a highly suitable project. I can't really match Phil Kraft for design and flying, but at least I could try my best at a sort of tribute to the master. Well the model has turned out very well, flies good and the manoeuvres are clean and the model has few vices with a good landing approach - just as I had envisaged.
Start with the Fuselage: Construction-wise the model is very easy. The fuselage has 3/32 sheet basic sides doubled with 1/16 ply from the front back to the cockpit. The formers are a mix of 1/8 ply for F1, F2, F3 and F4 is a 1/16 balsa sandwich. F5 and F6 are 1/8 balsa with F7 1/8 ply.
The plan is drawn for an OS25FP. The engine bearers are 1/2 x 3/8 beech, set diagonally to enable the silencer to sit in an opening on the underside of the cowl. The fuselage top and bottom are sheeted with flexi-ble 3/32 balsa (an option would be to plank it), although my model sheeted fairly easily.
The engine bay is different inasmuch as the top fuselage sheeting goes over right to the 1/8 ply C1 with a 3/8 balsa cowl front. The lower cowl sides are lithoplate bent at the top to form a rebated tongue which fits under the top cowling and spruce stiffener 1/4 x 1/8. The cowl is fixed at the bottom with two screws (either side) into the C2 member (this is 3/8 balsa faced with 1/8 spruce to enable the screws to hold).
The fuel tank is a 4 oz square MFA type which sits through F2.
The cooling-air exhausts through the rear underside and by the silencer to hopefully cool the OS .25.
Wire Undercarriage Construction: The undercarriage is the hardest bit of the model, ie it uses 10 swg piano wire All the joints are bound with 5A fuse-wire and soldered. There are two pieces of 16 swg bound and soldered at the bottom 'V' to carry and fix the spats and a pair of 16 swg linking wires at the top to position the main undercarriage mem-bers into the hardwood beech undercar-riage mountings in the wing.
The front 10 swg legs are bent to fork either side of the fuselage, i.e. no fixing to the fuselage at all. The triangle is filed in with 1/8 balsa epoxied into position and covered with Profilm. This all becomes self-explanatory when viewing the plan..."
Super Fli from R/C Model World, July 2003.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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ScaleType: This (oz13817) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.
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User commentsKeith's Wight Wizard (mentioned in text) is in the OuterZone collection (oz11820)
Marty Hillier - 12/05/2022
Got it, added a link to that plan page now. Many thanks.
SteveWMD - 12/05/2022
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