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    Improved Composite Reinforcement Sheet? "Tailorable Universal Feedstock for Forming("TuFF")

    I've read a few write-ups about these products, seems they might be useful in some applications. Apparently, compared to "normal" woven or biax materials they are more conformable, can make compound curves more readily. The targeted use appears to be small parts that are now more economically...
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    Paul Lamar's "RotaryEngine.net" site has gone dark?

    Apologies if this is old news. I just followed a Google search to the RotaryEng.net site, and the domain seems to now be defunct. Sometimes this is just an oversight on the part of the domain owner, sometimes it is more serious. Content there is still findable via the Wayback Machine archive...
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    Mooney Aircraft shuts down

    There's not a lot of info here, but Mooney has apparently closed their factory (Kerrville, TX) and furloughed all workers. More here.https://www.aopa.org/news-and-media/all-news/2019/november/13/mooney-factory-closed They have stopped production before, but . . . .
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    Easy CAD software for modest requirements: Fusion 360? Other?

    I'm trying (again) to move into the 21st century and learn a CAD program. Objectives: 1) Turn an aircraft idea, with dimensions, into an external 2D sketch and eventually a 3D rendering. 2) Lay out an internal 4130 tube-frame or aluminum bulkhead-and-longeron fuselage structure for the...
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    Loncin/Harbor Freight/Predator 708cc Vertical Shaft Engine

    This can go in the Industrial Engine sub-area, when it exists. I visited HF today and noticed one of these 708cc engines on display. I'd not looked at this model seriously before. Why look at a Predator 22HP vertical shaft when they make a 22HP horizontal shaft engine that would require less...
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    ELTs: 121.5-only units no longer legal for sale, no longer being certified

    This may be common knowledge, but I didn't get the memo. According to an article in Aviation Consumer, the FCC (not the FAA), as of Feb 2019 has issued a rule that prohibits the manufacture, importation, sale and certification of the old 121.5 Mhz ELTs. The old 121.5 beacons are still legal...
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    Predator (Harbor Freight) 670cc: Airboats, PSRU, Crank breaks, etc

    I ran across this site yesterday for a company (Lonestar Hovercraft) selling PSRUs for airboat use here in the US. They have a kit ready to mount on the HF Predator 670cc (22 HP) engine. Cog belt or V-belt versions, 1.66 ratio (other ratios available). They've been running them on airboats for...
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    Sandable glue/filer for foam: PU glue + spackle (Mar 2019 Kitplanes)

    There's an article in the Kitplanes issue I just got in the mail (March, 2019) about using a mixture of polyurethane glue (e.g Gorilla GLue) and water-based spackle. The author (Vince Homer) mixed Gorillla Glue and Sherwin Williams Shrink-Free Spackling in various proportions, and added flox to...
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    Wttman style landing gear options: tapered rod or flat. . . AL, Ti, or spring steel?

    When mulling over options for the main landing gear on LSA aircraft, I think the Wittman-style gear is popular for good reason: Simple, light, no maintenance (except replacement of the "damper units"--the tires), and good ability to keep absorbing energy and protecting occupants even if pushed...
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    Impact tolerant/high ductility composite hybrids (Dyneema, Spectra, etc)

    I've been reading a little about hybrid fabrics for composite layups providing increased impact resistance/ductility. The material is typically about 50% carbon fiber and 50% "something else" that has very high tensile strength (ultra-high molecular weigh polypropylene or polyethylene, trade...
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    HBA Advanced Search tab missing?

    The "Advanced Search" tab has gone missing on my display, for whatever reason. I think it was there yesterday. The function still exists (if I left click in an are to the left of the magnifying glass I eventually hit it and I go to the "Advanced Search" screen. I did try clearing out my...
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    The missing long-stroke 92mm bore VW Type 1s: 2234cc and 2287cc

    In another thread I mentioned this, but I'll post more here to avoid derailing that thread. Right now, the commonly available "stroked" VW sizes are in black below. Are the sizes in red also worth a look? Possible advantages of these 92mm bore Type 1s with 84 or 86mm strokes: - Maximum HP is...
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    VW 1835cc vs 1915cc: Why is the 1835cc more popular?

    When we talk about "small" VW aero engines (those with a 69mm stroke), I get the impression that most folks go for the 1835cc (92mm bore and 60HP) rather than the 1915cc (94mm bore and 65HP). Since the cost of the parts is the same, the weight is (virtually) the same, and boring the case for a...
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    "Micromaster"-- Centerline twin using small industrial engines

    I’ve been thinking about this aircraft idea for awhile, so I thought I’d just put it out here for public ridicule, er, comment. In a nutshell: A small, single-seat, twin engine, centerline thrust airplane powered by small, inexpensive 4-stroke industrial engines. I’ve been thinking of it...
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    Sonex aerodynamics, Pete Buck

    I'd be interested in any insight regarding the aerodynamic impact of design choices made on the Sonex. A recent post by VB mentioning Pete Buck made me think that some folks may have heard him comment of some of this. - Fuselage shape/lift: I've wondered if the fuselage shape was...
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    Engines: Cost and weight per HP

    Looking at the various discussions here about engine weights and cost, I gathered some numbers (below) for rough comparisons. 1) I looked at engines that could be bought new and completely assembled 2) Weights and costs are from "the internet", don't include exhaust systems, and are subject to a...
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    Moldless composite (aka "hotwired") --conventional (non-canard) aircraft

    I'm looking for examples of "conventional" aircraft designs that use "Rutan-style" moldless composite construction. 1) I recall reading of a one-off high-wing design that crashed on the way to Oshkosh (no serious injuries, I think it was engine or fuel related), and if anyone knows the name...
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    Adding redundant fuel and spark to auto/sled/motorcycle conversions.

    If we are converting an engine that is already equipped with modern electronic ignition (EI) and electronic fuel injection (EFI) systems, what are the options for adding economical, lightweight, reliable redundancy for assuring fuel and spark continue to arrive? I understand and agree that...
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    Low-cost CNC: New opportuniity for tab-in-slot composite designs?

    A recent thread on low-cost CNC routers for cutting panels got me thinking about the the potential these have to make building a composite plane faster and with more accuracy. The machines now can be built for less than $500, and can handle sheet sizes up to 4' x 8'. They are fairly accurate...
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