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Build Log
Rotor Pitcheron Scratch Build UK
I have wanted a pitcheron ever since Jay Decker (Sled Driver) posted his TWF Build Orgy thread, and wanted a Rotor since he made Ken Stuhr’s plans available on a website I can’t remember or find (please post the link if you know it).
This project was started in 2013 but had to be shelved. I am now ready to continue the project so I will publish the work done so far and endeavour to be consistent with future progress. This project is definitely budget driven, so the fuselage was built out of common builder’s ply and pine triangle. The wings (my first attempt at bagging with Mylar carriers) will be laminated with glass. I decided to build the model in triplicate to reuse any templates, Mylars, etc. that would otherwise be discarded after a scratch build. Also if I bury one airframe I will be less upset than if I buried the only airframe. Sorry for the grubby photos to date. Future ones will be much better. |
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In the Beginning:
Building in triplicate means you can band saw and belt sand six fuselage sides together and batch process the notching of triangular stock.
ImagesView all Images in thread
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Squaring Up
The pine triangles were not precisely right-angled in section and it was impossible to get both fuselage sides to align perfectly, so I marked the exposed triangle with felt tip pen and trimmed the fuselages square with the vertical sanding belt.
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Nice fuselage jig!
How thick is the ply for the fuse sides? |
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Detail Shaping
After coarse shaping, “shoe shining” the fuselage with 60 grit got the section curvature consistent. This technique does to curved sections what the sanding bar does to flat sections: it removes all relative high spots. Works great on block wing tips.
ImagesView all Images in thread
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Beautiful work!
What kind of weights are you getting on the fuses? |
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The Facilitator – My new vacuum pump
Yay! Decent pictures from now on!
One reason this project got shelved back in 2013 is because I didn’t have an adequate vacuum pump. I have bagged veneered wings with an old fridge compressor but I wanted a more professional setup for composites. I recently built the vacuum pump below using Joe Woodworker’s free guide for reference (https://www.joewoodworker.com/docs/ProjectEVS.pdf). My machine looks nothing like Joe’s but follows his system and concept to the letter, complete with pump start-up relief and use of a relay to increase the life of the vacuum switch. The vacuum reservoirs are aluminium cycling/rambling bottles of one litre and half litre (the white one) capacities. The machine’s footprint is 30cm x 25cm (12” x 10”). I got the Gast pump on eBay for £25 in 2008. It was grimy for it had seen considerable industrial use and had an electrical inspection label on it dating to 1995! It is now squeaky clean thanks to some TLC with baby wipes and a popsicle stick to push the wipes into tight spaces. You won’t believe how good baby wipes are at removing grime. The pump’s gasket and diaphragm had long since perished so I made new ones. The pump now works as intended. Brassware, tubing, gauge, etc. were sourced at Easy Composites (easycomposites.co.uk). The remaining components were got from eBay and other sources. Total investment so far is just over £250, but this tool should last me for life. Dodgy wiring will be isolated soon, I promise. |
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Last edited by Kenneth Paine; Oct 26, 2017 at 09:26 AM.
Reason: Spelling
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This is where we are
This is the current state of affairs. There is an ulterior motive as to why I have resurrected this project now: I am self-employed and work has stalled for the time being. Whilst I am not superstitious, Murphy’s Law is as certain as death and taxes, so now that I am committed to this thread the work will flood in preventing me from making any progress.
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Last edited by Kenneth Paine; Oct 26, 2017 at 10:12 AM.
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Poll
I have the following cloth for laminating onto the cores:
What should I use? 220g and 81g or 220g and 24g? Is one layer of uni enough? Bear in mind that I have nice grassy slope tops locally and don’t need rock cracking toughness. I just need enough to avoid in-flight failure at, say, 100mph. |
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