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  1. R

    Parts For Sale Nicopress parts

    Six small drawers of Nicopress parts. Pick up in Griffin, GA for $50.
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    Parts For Sale Warp Drive Prop

    As stated, bolt pattern is for O-200. Franklin copied that pattern for the Sport 4. Lycoming did not use that pattern.
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    Parts For Sale Warp Drive Prop

    Three blade Warp Drive prop, 64" diameter, bolt pattern for O-200 or Franklin Sport 4. $550
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    EAA - For better or worse

    My father wasn't impressed by most airshows, felt like he'd seen it all a hundred times, but he always loved to watch Duane Cole in his Taylorcraft. Doing such a smooth performance in a T-craft is more difficult than doing a crowd pleasing performance in an airplane designed for aerobatic...
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    EAA - For better or worse

    That heavy spring on the PTT phone might be something useful. I worked with an old grouch who said that to increase efficiency, work phones should have a timer that would give you an electric shock after a given time.
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    Two-seat WWII warbird replica candidates?

    https://www.vintagewings.ca/stories/flying-the-westland-lysander Sounds like it's "different".
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    EAA - For better or worse

    EAA has never been pure experimental. In the 1950's, most people just wanted to get into the air inexpensively. Lots of military surplus parts were available at scrap prices and major parts could be salvaged from wrecked aircraft. My father and Cal Parker bought a set of Luscombe wings, cut each...
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    Boeing following Mac Doug

    Replacing experienced employees with new hires to save money on salaries is not peculiar to Boeing. You just need a certain number of man-hours to get the job done and it doesn't matter who you get to fill the positions. You can also get a baby in one month if you put nine women on the program.
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    AT-21 assemble

    Spartan had AT-21's outside for engine runs when my father was there in 1950. He said that one day there was a loud noise and it turned out to be the aft fuselage of an AT-21 that had fallen to the ground after the termites stopped holding hands.
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    Boeing following Mac Doug

    Subcontracting out engineering and/or manufacturing can work well but not when the only consideration is "Who's the low bidder?" Rohr used to be Lockheed's go to for nacelles; a good argument could be made that they were better quality than doing the work in house. My limited experience with...
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    Re Engined B-52

    They could re-engine one position at a time to stretch out paying the expenses. That's a TF-39 in the photo.
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    Continental A80-8

    An old timer who knew those engines from when they were new said that the A-80's were bad about burning holes in the pistons. They were running 73 octane fuel or less in those days so I would suspect that they had preignition and that you wouldn't get it with today's fuel. I'd be tempted to try...
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    Wanted to purchase: Fluid Dynamic Drag- Hoerner

    Not for sale but I have to brag about my copy of "Fluid Dynamic Drag" that was given to me by a friend of my father's. Correspondence with Dr-Ing Hoerner was stuffed into the book including a letter replying to some questions. He says that wingtips are better than endplates and he recommends the...
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    Bolt holes, burr and fatigue life effects

    That's a good shop briefing. Regarding cold worked holes, ASTM Special Technical Publication 610-EB has a study on how in addition to the beneficial compressive stress at the hole surface of a cold worked hole, there are tensile stresses a short distance away from the hole which may increase...
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    Bolt holes, burr and fatigue life effects

    I've seen one study that found stress corrosion after holes in 7075-T6 were cold worked. Not a problem with over-aged tempers but better be careful with the old standbys like 2024-T3/-T4. The WWII production philosophy got passed on to a lot of guys who came into the business during the...
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    Video series on TIG welding thin wall aircraft tubing

    My father went through A&E school at Spartan in 1951 when all they learned was O/A welding. After he finished the welding class, he got a part-time job in the mod/repair division doing weld repairs on B-17 exhaust heat muffs. Even an inexperienced welder can O/A weld stainless if he's taught to...
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    Little Toot

    Little Toot wasn't designed as a Pitts substitute. George Meyer was a big man and built the airplane big enough for himself. George was a master builder but not highly experienced as a pilot and made an airplane that a Cessna 140 pilot could jump into and fly. He also built it as stout as the...
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    Bolt holes, burr and fatigue life effects

    I had a boss who had been an AE student when he got a job as a draftsman. He couldn't manage working and going to school at the same time so he dropped out. At that time, they didn't have any problem with promoting draftsmen to design engineers and he finished up his career as an engineering...
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    Bolt holes, burr and fatigue life effects

    Doing mod & repair work on large transport aircraft, a lot of poor workmanship would be uncovered as structure was disassembled. Someone remarked that instead of analyzing for a "rogue flaw" that was a .010" long crack in a fastener hole, we should assume that the rogue flaw was a large chisel...
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    Green zinc chromate primer as final finish

    Zinc chromate primer provides great corrosion protection because of the chromates. The chromates are depleted by exposure to moisture so a topcoat over the primer will provide the best protection by minimizing chromate depletion. How fast will the chromates be depleted? The USAF paid for a study...
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