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  1. R

    Long Shaft Systems and Torsional Vibration

    Wow! Such a complex system with soooooo many variables. Add in the need to make a PSRU light-weight and it is little wonder how few PSRUs survive in the long run. On a related note: long drive-shafts, I wonder how Bell was able to build so many thousand P-39 Airacobras and P-63 King Cobras in...
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    Parts Wanted Wanted: steel eye-bolts, 6mm thread and up to 40mm long

    Hi folks, I am searching for eye bolts to mount "stuff" on top of my van (2020 Nissan NV200). It already has anchor nuts welded into the roof. I need eye bolts with 6mm threads and threads less than 40mm long. Stainless steel would be ideal. Nissan does not carry them. Canadian Tire does not...
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    Pilot emergency parachute survey

    Do you wear a pilot emergency parachute? How often? Only phase one testing? Aerobatics? Formation flying? Every flight? Back type? Long back type? Seat type? Chest type? Ballistic recovery system? Do you strap a PEP on passengers?
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    Inverted gull wing, how much weight does it save on landing gear?

    Many posters love the "evil" look of the inverted gull wing as found on World War 2 vintage Junkers 87 Stuka or Chance Vought F4U Corsair. Designers claimed that inverted gull wings helped save weight on landing gear. In the case of Stuka, it saved some drag caused by fixed landing gear. In the...
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    Design challenge: world's smallest airplane.

    As the title suggests, I am challenging hb.commers to sketch the world's smallest airplane. We have been discussing this over on www.secretprojects.com. Rau Stitts and Robert H. Starr had cooperated on a couple of previous tiny record-holders, but Starr believed that he could do even better, so...
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    ACK-2 Amphibian

    I just bumped across a video on www.uoutuibe.com about the ACK-62, twin-engined amphibian. It resembles a curved, composite Lake Amphibian powered by a pair of Rotax 921 engines with reversable props. The prototype carries Russian registration (RA-??????) and is shown flying from a calm lake.
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    List of Cold War (post 1945) replicas that have flown.

    Let's compile a list of Cold War replicas that have flown. Aero L-39 jet trainer Grumman F8F Bearcat (one-off from Montreal) Lockheed T-33 jet trainer
  8. R

    List of early bird replicas that have flown.

    Let's compile a list of Early Bird replicas that have flown (pre 1914). A.V. Roe triplane Bleriot Curtiss Eintrich Taube Fokker "Spin" (aka. Spider) Santo Dumont Demoiselle Wright
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    List of inter-war (1919 to 1939) replicas that have flown

    Let's compile a list of replicas of inter-war airplanes (1919 to 1939). Avia BeeGee Racer Hawker Fury biplane Pete Racer PZL Ryan PT-22 Ryan Spirit of St. Louis
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    List of World War 1 replicas that have flown

    Let's compile a list of World War 1 replicas that have flown. Airco DH 2 pusher biplane Eintrich Taube monoplane Fokker D-VI biplane Fokker D VII biplane Fokker D VIII monoplane Fokker Dr. 1 triplane Fokker Eindecker monoplane Moraine Saulnier monoplane Nieuport 16 biplane Nieuport 17...
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    List of World War 2 replicas that have flown.

    Let's try to write a complete list of World War 2 replicas that have flown. Avia biplane Bjucker Jungman Trainer (wooden Jungster 1 plans-built) Boeing B-17 (half-scale replica by Bally) Curtiss P-40 Warhawk (Jurca, Loehle, etc.) deHavilland Mosquito (a group of Frenchmen) DH Tiger Moth...
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    Sidecar airplane?

    A whimsical challenge to design an airplane with a motorcycle sidecar. In keeping with the motorcycle theme, it would start out like a Volksplane 2 or 2D, open-profile fuselage plane, but add a sidecar for a passenger. Perhaps the "sidecar" would be a full, aerodynamic "egg" as test-flown on a...
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    List of the greatest airplane designers who started with rubber-powered models?

    Victor Bravo suggested this list on another forum. List of the greatest airplane designers who started with rubber-powered models: Al Backstrom - flying plank gliders Walter E. Mooney -
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    Whimsical challenge, assault glider 1940.

    May I pose a whimsical challenge? Build a better assault glider. It is the summer of 1940 and British Prime Minister Winston Churchill is shocked by German successes with paratroopers and assault gliders. You are a civilian engineer or RCAF engineering officer tasked with designing an assault...
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    Blue smoke part number?

    The other day, my radio blew out a cloud of blue smoke, then quit. I figured that the first step - in trouble-shooting - is to top off the blue smoke reservoir, but none of the old guys seem to have any spare blue smoke. Perusing the Aircraft Spruce and Sporty's catalogs was no help either. Does...
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    List of plans-built warbird replicas

    Let’s compile a list of plans-built and kit-built warbird replicas. They should include modern materials, modern engines and flight characteristics toned-down for low-time pilots by designers like Robert Baslee, Marcel Jurca, Graham Lee, Loehle, W.AR., etc. Antoinette Bleriot DeHavilland...
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    Another fictional group build

    This is the second in a series of fictional group builds. Last time you heard from your dear great aunt she was sewing new fabric on the rudder of the airplane she brought over from the old-country. She was rambunctious in her youth, competing in a variety of sports, flying air shows...
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    Community fiction, your uncle’s unfinished plane

    Pure fiction here. Pretend that your dear departed uncle bequeathed his hangar to you. Your uncle was an eccentric engineer with a bunch of patents and a career working in a secretive company that was rumoured to build super-secret projects for NASA, CIA and the other alphabet groups. The hangar...
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    Santa’s sleigh?

    How long did it take Santa Claus to build his sleigh? How much labour did Santa’s elves contribute? What type of wood did Santa use for sleigh runners? Is the body made of slats or plywood? Is the seat cushion made of horse hair or modern foam? Is the seat cushion covered in leather, brocade or...
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    Facet mobile for the 21st century

    The latest issue of KITPLANES Magazine contains a hint that Barnaby Wainfan is contemplating updating his Facetmobile. Fast forward to February 2019. Your latest project is ready to test run its engine, but you decide to wait until the outside temperature climbs above zero. You have cleaned out...
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