Thought I would start a new Thread for the Provost. Having purchased an old 1/4 scale Jetwelt Provost I decided I would prefer a smaller version to fly first. I had all the 3 views and drawings and after building Chris's Yak 50 thought it would suit his style of design, so we agreed on 1/6 scale and Chris produced the drawings, I had the wings and tail surfaces cut in foam & veneered, picked up some wood from Slec and within a couple of days had some thing that looked like a Provost. Wren had made up a twin wall jet tube for me at 900mm long and the fuzz was assembled around it. We mounted the turbine (Wren 70) and fired it up, with an infa red heat gun we measured the jet pipe temp and were surprised how cool it kept. At best on idle the outer pipe reached 34 C and 22 C at full throttle, we could not measure loss of thrust if any but it certainly seemed to have enough push. The wings have 3 dihedral braces, one either side of the retracts & one nearer the leading edge, I have chosen to use air retracts to keep the weight down on this one. Tail surfaces are foam veneer with the elevator servo's fitted in the tailplane, Hitec thin wing servo HS-7715TH 3.2kg @ 6V 3.9 @ 7.4V and only 20g each, the rudder is to be closed loop. As with the vamp keeping the tail as light as poss is the goal to keep ballast to a min. As stated in the Vamp Thread this is not a full scale model, we have altered things like the intakes to make molding of glass parts easier and cut down build time for the builder, the outline is true to the MK5/Strikemaster with the pointier nose. The whole top from the nose to the un-sheeted part of the fuzz is to be removable for easy access to all inside and is to be a fiberglass molding as with the tip tanks nose cone and air intakes. Will post more later when I get chance to work on it again.
Dave
