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  1. ghoffman

    New Spektrum Powersafe Receivers

    Integral mounts, telemetry, and less expensive than before.
  2. ghoffman

    New Spektrum Powersafe Receivers

    http://spektrumrc.com/Search/Default.aspx?SearchTerm=SPM_PTSD
  3. ghoffman

    On this Day in Aviation – Happy Birthday Jimmy Doolittle

    I had the opportunity to meet him in the 80's. I worked at TRW as a young engineer, and he was Chairman of the Board so he was my super, super, super boss. In the lobby of E2, he was just standing there next to a LEM decent engine that saved Apollo 13, and a Minuteman III Mark 12A reentry...
  4. ghoffman

    Get into Gas: Expert Installation & Setup Tips

    Cody Wojcik and I wrote this paper, "Gassers for Newbies" a couple of years ago. https://www.scribd.com/presentation/169936392/Gassers-for-Newbies-8
  5. ghoffman

    Give-a-way contest! Win a Hanger 9 Extra 300X

    The previous version was a fine plane, I want one of these, PLEASE!
  6. ghoffman

    "NEW" 125GX 125cc Twin-Cylinder Gas Engine

    Engine Price Weight (Lbs.) Carb brand Warranty (YEARS) (Engine only) DA-100L $1,100.00 5.57 Walbro 3 DA-120 $1,199.00 4.95 Walbro 3 GP-123 $899.00 5.2 Walbro 2 DLE-111V3 $729.99 5.5 DLE clone TBD DLE-120 $750.00 5.3 DLE clone TBD Evo 125GX $999.99 5.9 Walbro TBD ZDZ 112 $1,125.00 4.6 TBD TBD
  7. ghoffman

    NEW Servos

    Please post some details and specs!
  8. ghoffman

    Wanted Bowman Ring

    Why not use a ring from Desert Aircraft? The China engines have lousy rings, but DA's don't.
  9. ghoffman

    Give-a-way contest! Win a Hanger 9 Extra 300X

    I'd love to fly this beautiful plane!
  10. ghoffman

    Curious. Ethanol or not

    Because the truck has a knock sensor, MAP sensor, MAF sensor, O2 sensor, etc, to control the injector pulse width and timing and it is a 4 stroke that does not count on the oil in the fuel to lubricate things.
  11. ghoffman

    Curious. Ethanol or not

    On a 4 stroke it does not make much of a difference, but alcohols have little or no lubricity and are definitely not beneficial in a 2 stroke. And, if you look at the energy content of ethanol, it is about 1/2 that of gasoline (ethanol 23.4-26.8 MJ/kg for ethanol versus 46 MJ/kg for gas) to 10%...
  12. ghoffman

    Wanted New Bowman rings for DLE 30 and 35RA

    Mr Bowman retired.
  13. ghoffman

    New EFI DA-120 shown at WRAM

    Matt sent this pic from WRAM today
  14. ghoffman

    Drilling out hinge points

    That is what I do. The tapered soldering iron tip goes in about 1/2 inch, then you can drill it out with the correct size drill after it cools down.
  15. ghoffman

    Secret Footage of 3-D Printed Engine Baffle Process

    They have chocolate printers now. I want a pizza printer.
  16. ghoffman

    Wanted DA 120 New or gently used .

    I suggest you just call DA and see if they have any used/rebuilt ones.
  17. ghoffman

    AMA SHOW 2016 -- Video Coverage!!

    I noticed Angel was wearing a DA shirt..
  18. ghoffman

    Loctite "chapstick"

    I got a sample of Loctite 248 at work. It is basically blue Loctite in a non drippy "chapstick", so no mess.
  19. ghoffman

    Saito 61cc Four Stroke Gas Engine, NEW!

    What is the big finned heat sink for?
  20. ghoffman

    Stabilizer Design Discussion.

    On full scale planes (like F-16) the center of pressure is slightly aft of the pivot on the stabilator. This is something that you have to trade off. The closer they are to equal, the less force it takes to move it, but the more likely it is to flutter.
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