About this Plan
Widget. A very aerobatic flying wing for OS 20 or 26 FS.
Quote: "Like lots of my models this one started off as a thumbnail sketch on the back of a bit of paper in a meeting that was supposed to be of interest to me. I noticed that the other side of the paper said: 'What does being healthy mean to you? Flying model planes, obviously! Funnily enough this wasn't one of the options, I wonder why not?
As originally designed I didn't have any particular motor in mind but in July 1997 I had a particular need to run-in a couple of 0.S. 20 FS motors before I built a twin for them. I thought that I would need something light, with a reasonable glide, (previous experience seems to show that these little four-strokes like lots of running before they become 100% reliable) using a minimum of material and preferably with a built-up wing. Aha! Cue the high wing vintage job I hear you say. Nahh! Far too boring, Widget does all that and a lot more besides. OK so it isn't going to chuff around all day on a whiff of throttle and thermal all afternoon, but I only wanted a model that is not going to drop like a stone when the motor stops and Widget glides well enough to dispel that worry.
Construction starts with the wing. Not surprising really with a flying wing design! This is built up using a technique from my control line combat days of the early 1970's so I suppose it's almost a vintage design after all. Using thin ply, start by cutting out a template for the wing ribs. I made mine to suit rib 1 and then simply shortened the parallel section to suit the other ribs. If you don't fancy that you could always mark out the ribs individually. The resulting section is of curious aerodynamic design but it wastes very little material and has always worked for me in the air as well as being light and impact resistant.
Follow this by cutting out the strips for the leading edge, trailing edge, tips ans ailerons, all from 1/4in light sheet. Start the building by gluing the trailing edge scarrf joint together... "
Widget, RCM&E, Volume 41, Issue 3.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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User commentsHi, I recently built a couple of variations of my Widget design (downloading my drawing from your site as I couldn’t be bothered to search out the original), one I called Widget Midi (PAW 2.49, 36” span) and another called Mini Widget, nominally 24” span for CD Merlin .75 cc but , as I left the tips off, actually 21” span [pics 005, 006]. The little one in particular is great fun, surprisingly quick considering the engine and, without the tips, rolling much faster than the other. One mod I did to both “new” designs was to fit elevon servos into the wings, only using the outer half for controls in a hope of improving the glide of the original, which wasn’t great, it hasn’t helped much. What I DID find though was that the smaller models seemed more critical of balance. Both came out nose heavy (the original had big, standard sized servos towards the rear, these have tiny micro servos in the wings). I flew the little one like that but it lacked elevator authority in the glide. Ballast to the C/G shown on the original drawing had the midi version tail heavy and very marginal on stability so the point shown on the plan seems to be the rearmost possible position, a little further forward would be better.
Pic 008 also shows a R/C version of a KK Gazelle (same span, PAW 1.49 as per my C/L job of many years ago but box fus for gear and stretched in length) but this had a carb problem on the day and has yet to fly.
John Rutter - 01/03/2021
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