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  1. BrianW

    Design at new version of the Fournier Motor Glider

    Recalling that beam was never a problem, I am guessing you are appreciably taller than me - I am 5 ft 10 1/2 in: so that would put you at 6 ft 2 in plus?
  2. BrianW

    Flybar helicopter Model

  3. BrianW

    What is a common 4130 Sheet thickness for wing tabs?

    I remember (misremember?) from 60 years ago, a then Rolls-Royce employee telling me an early Rolls aero engine was secured with a single 1/4 inch bolt (as unbelievable now as then)
  4. BrianW

    Basic Modern Ultralight, BMU

    I finally found a reference to kitplanes wheel build. It was in the March 1990 magazine. Trouble is, I still cannot find a copy. The archive does not go back that far. Brian
  5. BrianW

    EU any recommended source of aircraft grade Al like 6061-T6 etc.

    You might consider 4% copper alloy - invented for use on the Graf Zeppelin. I think you can also obtain it in the US as 2024 - stronger than 6061. <g> Stronger yet are the zinc alloys like 7075 then there's titanium ~ a shade pricey!
  6. BrianW

    Thoughts on terminating wire cables with ferrules: copper/aluminum, wire-wound, stainless.

    I would never use a copper nicopress on galvanized steel cable - it's asking for galvanic corrosion.
  7. BrianW

    Thoughts on terminating wire cables with ferrules: copper/aluminum, wire-wound, stainless.

    Interesting assertions here. 1) Try testing a plain wire cable to cable connection using a copper oval nicopress. I assure you, It will NOT fail either cable before the Nicopress lets go. (It is the thimble friction that adds strength to this terminal method.) 2) Swaging is a high strength...
  8. BrianW

    Thoughts on terminating wire cables with ferrules: copper/aluminum, wire-wound, stainless.

    Did I ask a question, in my review of cable & wire terminations? <g>
  9. BrianW

    Thoughts on terminating wire cables with ferrules: copper/aluminum, wire-wound, stainless.

    Fair question. I would like to achieve some skill at swedging balls, balls and single or double shanks and stud/fork and eye ends. For fun really. But knowing that aluminum nicopress ovals and stops are not good on stainless wire - and copper nicopress is weaker than swedged terminals.
  10. BrianW

    Thoughts on terminating wire cables with ferrules: copper/aluminum, wire-wound, stainless.

    There are contrasting techniques of terminating tension wires. 1) threading a solid wire through a wound wire and finishing with a hook in the wire 2) threading a cable through a bobbin and ferrule, secured by two three or four crimps 3) threading a cable through a tapered cylinder, with...
  11. BrianW

    Hack RF for ADS-B

    Hmmm...let's see: because you had access to an ADSB-IN display, you knew the distance, altitude, heading, and registration number of an aircraft on a collision course, and changed altitude to avoid the conflict traffic. With the conflict overhead, you complained that he did not look out the...
  12. BrianW

    Hack RF for ADS-B

    This is probably a good place to start: http://stratux.me/
  13. BrianW

    Hack RF for ADS-B

    Since no one else mentioned it ~ Stratux is a homebuild box with two software defined radios listening on the two UHF bands on which aircraft with ADSB-OUT and ADS towers transmit dynamic aircraft location, speed and altitude information, along with weather. The rasberry pi host retransmits...
  14. BrianW

    Down-Home Vibrometer

    So the scope shows a straight line? low level random noise? high-level noise? A scope shot would be worth a thousand words! Anyway - the accelerometer signal needs a low pass filter: if you run the prop at 1400 rpm, you need to low pass the frequencies below 24Hz only - you only have one mass...
  15. BrianW

    Bubble party--acrylic canopy transparencies

    Fact-Checking is a disease with me: Polycarbonate sheet Hardness R 118 Tensile ultimate 9500 psi Softening temp 152 degC Acrylic sheet Hardness Rockwell M 93 (about the same as Rockwell R 118) Tensile ultimate 10000-11700 psi Softening 115 deg C Cannot put my finger on the reason...
  16. BrianW

    Down-Home Vibrometer

    There you go: probably don't need a smart sensor, but if you do, probably shouldn't use an Arduino. Ah, if only I had specified the use of an nRF52840 from Nordic Semiconductors, a 32-bit ARM® Cortex™-M4 CPU running at 64 MHz. with 1MB of program memory.. . [forgive my making fun - this is a...
  17. BrianW

    Not-so-solid massive core wings: Lightening the core foam

    Are you thinking of the glass bead slurry/mud that some have used?
  18. BrianW

    Down-Home Vibrometer

    A few days after this vibration thread completed, I got a private note which mentioned the familiar rough engine sound which occurs when embarking on a trip across any considerable body of water - and how it would be good to have a device listening for real as opposed to imagined auto-rough...
  19. BrianW

    Not-so-solid massive core wings: Lightening the core foam

    In my fever dreams, over the tube and foam ribs, would go a hard shiny film, stronger than the Sripol film which left an orange peel finish; instead an optically smooth film like say cellulose sheet- but strong and light.
  20. BrianW

    Latex & pearl......???

    There's speculation then there's experience - like this response.
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