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Building and Flying a Pitts S-1T Airplane

With a Pitts S-2E and a 1947 Aeronca Chief on the Side

Pitts S-1T N68RH Serial No. 001  Built by Roger Hess

Pitts S-1T N68RH
Serial No. 001 – Built by Roger Hess

Thousands of amateurs have built and flown their own airplanes since the beginning of manned flight, in a time before flying machines were even called airplanes. Plans for a bi-wing glider were found in a 1913 copy of The Boy Mechanic, fully described in a page and a half of text and one drawing. In the early 1930s a series of magazine articles covered the construction of a Pietenpol Air Camper, a high-wing monoplane built of wood and powered by a Model A engine. In the 1960s or early ’70s Popular Mechanics magazine published a set of plans for the Volksplane, a wonderfully simplistic and boxy airplane powered by an air-cooled Volkswagen engine.

Plans-built aircraft are still plentiful, but kit-built aircraft, where many of the sub-assemblies are supplied factory-made have increased in popularity. As long as the builder performs more than half of the overall construction effort the aircraft can still be considered amateur-built, operating with a special airworthiness certificate in the experimental category. The freedom to innovate designs destined for this experimental category – without the constraints of type certification – has resulted in a large number of amateur-built aircraft that exceed the performance, efficiency, and in many cases the beauty of production aircraft.… Read the rest

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Review: SJK-1 Digital Wax Carving Pencil

Inexpensive Dual-Handle Unit With Independent Temperature Controls

This is Just One of Several Types of Inexpensive Wax Carvers Available on eBay

This is Just One of Several Types of Inexpensive Wax Carvers Available on eBay

After experimenting around with a few different sculpting mediums, wax seems to be a material that I might be able to do something with. Subtractive sculpting in wood requires too much vision, training, or talent – none of which I have. Clays allow addition of material to fill in mistakes, but I haven’t had much luck obtaining a finish suitable for producing a final mold from which I can cast multiple pieces.

But wax is different. Some of the harder varieties of sculpting wax can be carved and polished to a very high finish and are durable enough to easily make it through the process of mold-making. The ability to build up or repair wax fairly quickly makes it attractive for experienced sculptors as well as those of us that have to repeatedly add or subtract material until whatever we are making looks right.

It took about five minutes of using an alcohol lamp to heat tools and melt wax to realize that an electric wax pencil would be a necessity. And since I didn’t know much about what I needed or whether I would stick with carving, I looked for something that didn’t cost several hundred dollars.… Read the rest

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Equalizing CRT Phosphor Wear Patterns

Re-Use or Extend the Useful Life of CRT Projector Tubes

Proj A_green tube mod 533

Phosphor Wear Pattern on Face of One of Two Green CRT Projector Tubes.
The Effect of This Wear Was Reduced Using the Procedure Outlined Here

Note: this article is several years old but may still be of interest to some home theater enthusiasts.

CRT (cathode ray tube) projectors may be a dying technology, but they are not dead yet. Despite their size and weight compared with digital projectors, CRT projectors have some advantages that an enthusiastic subculture of home-theater aficionados cannot abandon, at least until something truly better comes along. CRTs can produce the deepest and most uniform black levels, and tube life far exceeds the lamp life of a digital. CRT projectors, despite their complexity, are highly repairable compared to a typical digital projector where even the replacement of the lamp may be cause to abandon the whole unit and buy another.

In a CRT projector three separate images produced on the faces of red, green, and blue tubes are converged and projected via separate lenses onto a screen to create a full color image. The light is actually produced by an electron beam striking a phosphor coating on the faces of the tubes.… Read the rest

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