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  1. ghoffman

    Joe Nall 2014!!!!

    When will it be available, next year?
  2. ghoffman

    Aztech Aeromodels Spot on Version2 Servo Arms

    Now, if you really wanted the best, one would use aluminum alloy 7085 which has a yield strength of 78,000 psi. This is about 2.5 times stronger than 6063 with the same weight. It is used on the Airbus A380 for primary structure like the wing spars and landing gear parts.
  3. ghoffman

    Aztech Aeromodels Spot on Version2 Servo Arms

    The yield strength of 6061 is 40,000 PSI, 6063 is 31,000 PSI, or almost 25% less. And if you compare the ultimate bearing strengths (which would be like the screw ripping out the side of the arm) the 6061 is about 30% greater. However, with 6063, one could extrude it to a near net shape and...
  4. ghoffman

    91" Extra 300-EXP ARF

    Wish me luck, going to beat up this new tailwheel assembly today.
  5. ghoffman

    Aztech Aeromodels Spot on Version2 Servo Arms

    6061 is actually better, but it can't be extruded. 6063 is better able to be pushed through an extruder die. All aluminum alloys have the same modulus (stiffness) but 7075 would be best if I had my choice for a CNC machined arm because it is about 2x stronger than 6061.
  6. ghoffman

    35CC 3D Plane

    Do you want me to do an FEA on that?
  7. ghoffman

    Aj aircraft 93,73,56 laser

    Hey, if I am qualified to make parts for Boeing, Airbus, Sikorsky, etc, I can make parts for AJ Aircraft!
  8. ghoffman

    Servo bench testing

    I plan on using a power supply from Tom Lianza.
  9. ghoffman

    Servo bench testing

    I revised my servo tester. Now I think I will get a better current meter as well.
  10. ghoffman

    Revised servo tester

    Thanks. BTW, it is a straight pull when under tension.
  11. ghoffman

    Revised servo tester

    I revised my servo tester with some stuff I had laying around and printed a couple of parts. The only thing that cost any money was the scale from Walmart which was $20.
  12. ghoffman

    Discussion Gas vs. Electric

    There is a very good reason why there are no full scale electric planes. After 5 minutes or so, electrics are ready to land or fall out of the sky. But electric motors have max torque at zero RPM so for a while they are best, and are quiet. As battery technology continues to improve, so will...
  13. ghoffman

    Discussion Gas vs. Electric

    http://www.scribd.com/doc/169936392/Gassers-for-Newbies-8
  14. ghoffman

    35CC 3D Plane

    +1, I just do not understand the ignition battery and opto kill thing. The Velox is one of my favorites.
  15. ghoffman

    The 3DRCForums -Discuss Anything Thread-

    I have the 104 AJS, and am hoping to have a AJ Laser this Summer. Frankly, the 91 EF Extra handles better than the AJS but the DA-120 is just perfect.
  16. ghoffman

    The 3DRCForums -Discuss Anything Thread-

    Aw, they suck. Since they are always sold out in a day, you don't really want one. Save the inventory for me please. (enter sarcastic specific font here).
  17. ghoffman

    Hot off the truck! DLE-61's are here!!!

    The way Nordlocks do not work is where there is relaxation under the screw head. They will not work on wood, soft plastics etc. They would be iffy with a wood prop, but under the CF Mej props or aluminum standoffs and the like, they are are a 100% solution. For engine mounts, I embed brass...
  18. ghoffman

    Hot off the truck! DLE-61's are here!!!

    Split "Lock" washers do not work, regardless of who made them or the application. I did a USAF sponsored fastener test at TRW, and we found them to have zero value whatsoever. Nordlocks do work well however. Is there some interference that required the new mounting pattern? Our testing...
  19. ghoffman

    Hot off the truck! DLE-61's are here!!!

    I would ditch 3 things, the exhaust gasket, the throttle idle stop screw and the split "lock" washers on the prop screws. The tapped hole in the jug is a nice touch, some Pitts style mufflers should use it for additional support. Do I understand correctly the mounting pattern is different than...
  20. ghoffman

    New Here? Introduce yourself!

    They (2) fit easily on the 91 inch EF Extra.
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