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  1. jonnycowboy

    Partially supported inner bearing surface

    Unfortunately I can't as it is not solid aluminium but an extrusion with a specific shape (similar to T-slot).
  2. jonnycowboy

    Partially supported inner bearing surface

    Great, concise answers. I'll think of something else, Thanks!
  3. jonnycowboy

    Partially supported inner bearing surface

    Hi all, I am looking into an application of an "unfortunate" square-peg-in-a-round-hole. I need to fit a 40-mm square extrusion into a 50mm ID bearing. The application is low speed, <500RPM with low loads (robotic arm). I am looking into turning (lathe) the square 40mm extrusion so that I end...
  4. jonnycowboy

    Miniature Pressure Port

    pmrobert, another great idea, thanks!!
  5. jonnycowboy

    Vanes with a Tilted Radiator

    No vanes. This might help you: http://scarbsf1.wordpress.com/2011/05/19/toro-rosso-radiator-layout/
  6. jonnycowboy

    Miniature Pressure Port

    I am doing both pitot and AOA in a single probe. AOA will be measuring the pressure difference between the bottom and the top probes (known as a smart probe). That's good information for the edge effects, I was just going to bevel the edges of the holes but I'll take a look at detailed...
  7. jonnycowboy

    Miniature Pressure Port

    I never thought of using a tube insert, that's a really good idea. I guess I would bond it in? Or simply heat the big tube, chill the small one and insert it with a small interference fit? Testing: intially calibrated in freestream (ie: outside) and then in a wind tunnel.
  8. jonnycowboy

    Miniature Pressure Port

    No it's for AOA probe use. NACA report 1364 shows that small pressure ports are the most effective (0.020"-0.030" generally). That's tiny, I know and unfortunately I won't be able to do it on my lathe, I'll need to use EDM drilling. Unless you have experience otherwise, that using a small...
  9. jonnycowboy

    Miniature Pressure Port

    I found something: http://www.beswick.com/products/product_details.php?pid=8 The flow-through size is a bit bigger than I hoped but I think it'll be OK.
  10. jonnycowboy

    Miniature Pressure Port

    The pressure will be low (total and dynamic pressure measurements), my sensors are capable of 0-30psia max. I have found some threadable ports but they have M5 threads, that's too big. I was hoping for M3 (or similar imperial size) with 0.025" holes.
  11. jonnycowboy

    Miniature Pressure Port

    Hi all, I'm looking for a threadable pressure port, the smallest possible. The pressure sensing and "working" lines have very small diameters (~20 thou "). I need the sense line to be 90 degrees to the "working" line I'm wondering if I have to use something fairly large or is there something...
  12. jonnycowboy

    Standard/Recommended Practice for Discrete I/O in Aircraft Application

    Hglr, thank you very much for your reponse. I don't have access to the Airbus spec however the DEI part information does mention the spec and its tolerances. We are aware of the Do-160 reqs. Thanks again!
  13. jonnycowboy

    Standard/Recommended Practice for Discrete I/O in Aircraft Application

    Hi all, I'm wondering if there is a standard specifying voltage levels for aircraft use of Discrete I/Os? IE: Gnd/Open would be: gnd, logic 1 open, logic 0 logic 0 lower limit: 12VDC logic 0 upper limit: 48VDC logic 1 lower limit: -2VDC logic 1 upper limit: 5VDC? Same question for 28V/Open...
  14. jonnycowboy

    Slewing Ring Bearing (crossed-roller) availability

    Hi, thanks for the link. I don't think however that a thin section since I will be loading the bearing with a large moment arm... thanks though!
  15. jonnycowboy

    Slewing Ring Bearing (crossed-roller) availability

    Hi guys, I'm trying to find a single slewing ring bearing (apprx 400-500mm OD), internal gear. Everytime I call anywhere they're asking for 4-6 mnths after payment (!!). Is there anywhere (on the web, or my local bearing shop?) I could find this in stock somewhere? The application is a robotic...
  16. jonnycowboy

    Twin or Single Round Throttle Body for better throttle response?

    Throttle response, keeping everything in the engine the same (interial effects such as flywheel), is a function of 'throttled air', ie the volume of air between the throttle plate and the valve. This is reason that individual throttle bodies have better throttle responses when compared to a...
  17. jonnycowboy

    Help on how to reduce drag

    Hi there 'team cowie'! Nice R32 you got there.. At 160mph there is definately some aerodynamic effet coming into play. A completely flat floor (in lightweight fiberglass or other) would definately be a start. In addition, since you're only running the car in drag configuration, you should get...
  18. jonnycowboy

    winglet design

    Hi Kieran, You can also add counter-rotating tip-mounted props to reduce vortex flow. Here is a good article from one of the fathers of winglet design. http://www.mandhsoaring.com/articles/Winglet_Design.pdf
  19. jonnycowboy

    Training New Hires

    Thanks for the solutions, the PDF works great :)
  20. jonnycowboy

    Hydraulic circuit design software

    thanks incredibly!

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