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This thread is privately moderated by Rusty-Gunn, who may elect to delete unwanted replies. |
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Build Log
Ptarmigan Trainer 28 Mk III
This is the next version of my Ptarmigan Trainer nitro plane. I'm modelling this one after the LT-25, for it's fuselage style of build: sheet frame rather than stick frame.
I built the fuselage, and the tail feathers. The tail feathers and wing tips are more "swept" in design simply for the looks of it, as compared to the Mk II version. There was a point when I doubted myself as to whether the tail feathers were too big, so I made them smaller. I've since made them bigger. I decided to use a constant cord wing set rather than the tapered wing I originally designed. I also shorted the new wing set to 50 inches. The engine is to be an OS .32. Four channel control (Mk II was three channel). Tricycle gear, rather than tail-dragger. Link to build tread for more info. (I'll update this blog thread as well.) https://www.rcgroups.com/forums/show....php?t=1637189 Edit: 5-4-12 - I done made the fuselage too wide for the engine I'm using. Or I need a muffler extension. Either way, I'll build a new, narrower fuselage for this plane. I'll save the fuselage for another trainer someday. At least I can add a few inches to the new one's length as well. Mistakes are good if we learn by them. Edit: 5-10-12 I made an extension for the muffler by cutting off the end of a spare muffler. This now allows the engine to be mounted to the airframe with a small amount of clearance. Edit: 5-30-12 I got the ribs cut out, carved to shape and sanded smooth. Time is limited, so the build is slow. |
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Last edited by Rusty-Gunn; May 30, 2012 at 06:16 PM.
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4-7-15... I took a new look at plane yesterday to see what sort of work it needs to have. I then ordered new steel solder-on clevises to finish the control rods due to having had moved the servos forward into the "cockpit". Longer rods will be made.
I remembered that the tail was actually glued in crooked. It's angled, giving the airplane left turn if it were flying. I removed the tail so I can fix this and glue in the tail straight. How I missed this I have no idea. I am getting a bit eager to finish this airplane. |
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