The Feugray TR-260 Notes

The original full size Feugray TR-260 is a single seat light aircraft designed specifically for aerobatic competition's. A 52" R/c model was offered as a free plan in RCMandE, September 2008 designed by Pete Miller. The plan offered here is a completely redrawn version for 0.46 - 0.65 engines and scales at 63" span. Construction is straightforward, the wing is flat (no dihedral) on the upper surface and two servo's are built into the wings. A battery box is built in under the fuel tank. Tail and Fin hinges are done with silicon adhesive. Full details of this method can be found on the internet, see below. Photo's of the full size aircraft can be seen at www.abpic.co.uk Just type Feugray in the search box, 3 examples come up. Very useful for scale decor.

Four Stroke Version

Since starting my model I have decided to fit an inverted SC 65 Four Stroke. This should give a few positive advantages. First the exhaust will be fully contained within the cowl, exiting on the underside. Balance should be better, more power and a lower fuel consumption, a cleaner model, plus the exhaust note will be more realistic and probably quieter. With care, apart from the rocker cover on the underside the engine will be fully cowled. I am also fitting a South Herts Glow Booster so access to the glow plug will not be a problem. Apart from the location of the engine bearers and the throttle snake the design is more or less unchanged. With care you can get an 11oz. tank in, but a 9oz. should be large enough. The tank should be removable through the hole in F2. (watch the hole in F2 and its location if you move the tank sideways or fit a bigger tank) If the "clunk" gets reversed in a heavy landing you are in trouble. The servo tray and servo's will need to come out to remove the tank and the battery which fits into a box under the tank. You could always fit the servo's one bay to the rear or do a 1 - 2 split on seperate trays, there is plenty of room for a number of options. One option would be to locate the elevator and rudder servo's in the outer fuselage rear. Always an ugly option and balance can be a problem but it does give snappy control response with no flutter.

Keep control throws to 6mm up/down on ALL surfaces when on LOW rates & increase to 8/10mm on HIGH rates. Use +50% Expo on all rates. On early flights allow plenty of UP elevator. Say 10mm on LOW rates. Reduce later as required.

Tip 1. When building the wing cut an accurate alloy template for R1. The curve on the TOP of all the other ribs R2 - R11 is exactly the same although the length varies. Avoid the " sandwich " method. It does not work, the top surface is usually at a steep angle and unless all the ribs are equi-spaced it does not give accurate ribs anyway.

Tip 2. The rear 5mm wing mounting screws are a problem. When the wing is removed the screws fall out into the fuselage and it is very hard to re-locate. To solve this problem, secure the nylon screws with nuts and a spacer, just a few thou' thicker than the lower plate. When the wing is removed (try and unscrew both screws at the same time) the wing comes off and leaves the screws in situ. Details on the plan. Keep the screws as short as possible.

Tip 3. I decided that the wing fixing method was problematical as access to the bolts was difficult (thro' the fuselage bottom) and very long nylon bolts were required. The revised method requires a removable canopy with two bolts thro' the "cabin floor" or wing top surface. A 6mm cross member with two 5mm captive nuts complets the assy. Both methods are shown on the plan.

Full information on Silicon Aileron Hinges at www.slopeflyer.com also plenty of links for UHU Por. Try Google.

These are large files and do take 3 or 4 mins to download, so please be patient.

Download (March 2012) Feugray Wing.pdf

Download (March 2012) Feugray Fuselage.pdf

Text andcopy; Colin Usher 2012 Illustrations andcopy; Colin Usher 2012

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