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  1. Pete Barker

    Prop Math and Design

    Prop Math and Design-surface & adhesive Another practical matter for wood prop construction is adhesives and final surface. The EAA literature suggests T88, cascophen and resorcinal for laminating wood for airframes. Is there a good recent technical/engineering discussion of casein glues...
  2. Pete Barker

    Prop Math and Design

    Re: Prop Math and Design: bolt hole radial orientation wrt wood grain For laminated wood props, is there mechanical logic behind the radial orientation of bolt holes with respect to the wood grain of laminations? I note that holes may be found in some props in which the cross-hub diameter is...
  3. Pete Barker

    Pober Pixie Build

    Great project: which engine/prop will you use? John Leitis, who passed away last year, built N81JL and mounted a C85-12F. He made some modifications to accommodate the heavier engine (designed for a 65 hp VW). I had a few discussions with him about building and flying it, and he was generous...
  4. Pete Barker

    Prop Math and Design

    Gordon, Nice spreadsheet. Can you add to the wood selection: English walnut, black walnut and Honduran mahogany? Is it appropriate to use with low rpm (1200 rpm)/low torque (100-350 lb-ft), hi diameter (88-95 in) props? Best, @pete
  5. Pete Barker

    Prop Math and Design

    Looking at possible props to fit the new Laszlo Ungar Anzani W engine (pioneeraviator.com), a few mysteries arose. Some published photos of Bleriot and his XI aircraft on assembly prior to the Channel flight (July 25, 1909) show a square-tipped prop. Other photos purported to be Bleriot's take...
  6. Pete Barker

    Prop Math and Design

    Prop Math and Design: nanotech coatings Anyone up on nanotechnology coating of props to alter prop surface features toward better efficiency?
  7. Pete Barker

    Prop Math and Design

    Good to remember that the Wrights concluded early on that Lilienthal's pressure data were faulty, and set out to make their own measurements in a wind tunnel. Best results come from solid data. Great discussion here. Norris' book looks good, although the website smacks a little of hyperbole...
  8. Pete Barker

    Prop Math and Design

    I started with Durand's exhaustive ~1920 paper systematically testing a broad range of a few dozen wood prop designs and Whyrill Park's treatise on prop design. There were a few "take home" lessons, but what surprises me is that even in 2011, prop design still seems more art than science. If...
  9. Pete Barker

    Prop Math and Design

    For example, McCauley Met-L-Prop Klip Tip CM7148 Design 1B90 (dia 71" x pitch 48"), from a Cessna 120/140 with a C85-12F engine. Forged aluminum, although McCauley did produce ground adjustable steel props in 1941, going to forged aluminum in 1946 (alloy?). Root section at 0.1 radius is...
  10. Pete Barker

    Prop Math and Design

    Since both prop steel and prop wood (eg., mahogany, walnut, maple) have defined materials characteristics, seems that with constant performance in mind on the same power plant, it should be possible to approximate the "right" geometry for a wood prop from an existing metal prop of known...
  11. Pete Barker

    Prop Math and Design

    Given dimensions of a metal prop, is there an algorithm that generates the specs on a wood prop that will give the same performance?
  12. Pete Barker

    Panel Design Criteria

    Given FAA requirements for day/night VFR and panel dimensions, what are the general rules for laying out an efficient panel? Specific application here is a small open cockpit high wing single seater. I'm using a C152 as the starting point for panel design. For example: 1) Minimum distance...
  13. Pete Barker

    aluminum and wood construction

    Hope this is not too OT, but there are some interesting developments brewing at Baslee's place, follow-ups on Russ Turner's aluminum tube Camel. Does anyone have experience with aluminum tube/gusset/rivet style construction (fuselage) to comment on, compared with welded 4130? The 1928 Boeing...
  14. Pete Barker

    Modern Radials

    Re: Post #3, there are occasional used Rotec radials out there for sale, especially ther R2800 (~110 hp). Keep an eye on eBay and contact Rotec directly in Australia. Initial results have been quite good for homebuilts and replicas-see customer list of flying projects on their website. Early...
  15. Pete Barker

    R3600 Performance and prop data

    Recently saw Avro 504K-powered by a new Rotec R3600 fly at a local airshow. Anyone have experience with props for the R3600 or some hard numbers on performance? Thanks. -pete
  16. Pete Barker

    Av Engine audio files

    Does anyone have an audio file online or a CD of a C85-12F engine? Thanks, Pete
  17. Pete Barker

    Gussett Manufacturing Methods

    Does anyone have an efficient way of cutting the hunderds of 3/32 wood ply gussetts (~ 1" x 3")? I've tried matte knife and straight edge, but there must be a better way of generating identical small gussetts with less knuckle stress. Please advise. -pete
  18. Pete Barker

    Luscombe Door Insulation

    Anyone have a source for the padding inside a 1946 8E door? There are two heavy cardboard panels that sandwich a fiberglass (?) wool insulation between. No indication from parts list what materials are used. Thanks. -pete
  19. Pete Barker

    C85-12F magnetos

    Re: C85-12F magnetos Slick Brackets Dan: Thanks for excellent photos and Cessna p/n. -pete.
  20. Pete Barker

    C85-12F magnetos

    Case and Eisemann mags have flanges integral to the mag housing to mate to the C85-12F accessory case. Slick 4201Rs have no flanges: can anyone post a photo of their Slick installation of a C75, C85, C90 or O-200? Case (above); Eisemann (middle); Slick (below)
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