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A couple of weeks ago I acquired a pair of Chris Foss slope gliders, a Phase Four and a Phase 5. I have the plans for both and they were in the building queue but kept slipping down it! The Phase Four is a 67" span, symmetrical wing section progression of the Phase 2 (there was an abandoned Phase 3 design according to Chris). The plan shows strip ailerons, there is another plan (that I don't have) that details flaps and ailerons with a mechanically coupled flap/elevator mix. This particular model had the split controls (or a variation of it) and an enlarged rudder with ventral fin. Reading a note on the plan the large rudder was revised in 1975 and the wing mount is also reversed (bolt at the front, dowel at the rear) so this model is either pre-1975 or built from the pre-1975 plan. The radio hatch was missing and some lead had punched a hole through the noseblock. I'm not sure if it has ever flown, there were servo screw holes but no grass stains or other signs of use. The Phase 5 (now available as the 5e in ARTF form) was unfinished, there were no fuselage servo mounts and the tailplanes were either missing or not built. It has been built true to the original plan with one aileron servo driving inner and outer ailerons through piano wire links and bellcranks. I have managed to free this up and get it working nicely, it would have been too much work with a risk of damage to convert it to a four servo wing (but I am doing that with the Phase Four). Both models have been very well built and nicely covered in nylon, a skill I've not tried to learn (I know it wouldn't go well!!). Some general photos: Phase Four wing underside: Fuselage: Pre-1975 rudder and under fin, the other hole is for a 35 mHz aerial exit: Fairly sound but missing the radio hatch: Phase 5, minus tailplanes:
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