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  1. thruthefence

    Ntsb report on P51 Crash in reno

    This is simply a case of the most basic tenets of aircraft maintenance and inspection being ignored, in lieu of shiny polished aluminum, esoteric engine modifications, and operational hubris (or ignorance). There is NOTHING that will kill you more surely then slop in an elevator tab, and few...
  2. thruthefence

    Water injection and alcohol fuel

    The Soviet Bloc M14P radial aircraft engine uses a Compressed air starter. The reservoir tank charges up in flight after engine start, but if for some reason it fails to start, you can pump it back up by hand. Used to be a guy at the airport that has a Sukhoi with one of these things in it.
  3. thruthefence

    Water injection and alcohol fuel

    A perfect "Steampunk" construct, possibly powering a wrought iron dirigible!
  4. thruthefence

    Classification of minor & major repair

    This is from 14 CFR part 1: ( I'm assuming a USA registered aircraft ) " Major repair means a repair: (1) That, if improperly done, might appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting...
  5. thruthefence

    MS20470 Raised Head Rivet Allowable Head Damage

    MIL-HDBK-5H 8.1.2 http://tinyurl.com/8rof86d
  6. thruthefence

    Lotus going down the tubes?

    Anyone from the UK have any information? http://www.topgear.com/uk/car-news/problems-at-lotus-2012-9-25?utm_source=rss&utm_medium=rss&utm_campaign=ongoing
  7. thruthefence

    RC aircraft dyno

    Obtain a suitable test club prop.Typically short span, wide chord, and coarse pitch, compared to a "real" propeller. Shroud it. Obtain an electric motor, use the motor to drive the prop so some n rpm. Measure the electric load required to do so.Do the math, and you have the HP needed to drive...
  8. thruthefence

    Any restrictions against applying the torque from the Head side of a bolt?

    Most of these bolts have a radius under the head. make sure what ever hardened washer you use, has a corresponding radius, or relief to accept it. http://www.nasbolts.co.uk/acatalog/washerspecs2.jpg
  9. thruthefence

    Aircooled Engine - Extraction of hot air via low pressure

    Design some sort of augmenter exhaust system to use the velocity of the exhaust gases to extract air from the low pressure side of the engine. http://tinyurl.com/c9m6s48
  10. thruthefence

    Intake/exhaust valve diameter ratio on older OHV8s

    And going a little further back in time, we have this: http://xroads.virginia.edu/~music/blues/tb.html
  11. thruthefence

    FLUTTER

    It'll kill ya!
  12. thruthefence

    Defective Standard Hardware - MS21042, NAS1291 self-locking nut failures

    I've seen two failures in the field, both MS21042-4. The bolts were loaded in shear, and the torque putty was still intact. Scarey stuff when the helicopter drive train is full of this stuff.
  13. thruthefence

    Is Aeronautical Engineering better than Aircraft Maintenance Engineering?

    http://www.faa.gov/library/manuals/aircraft/ select the various FAA-H-8083-XX manuals. Very large PDF files. If you are an AME, you are a mechanic. Not saying it can't be a hoot, (I have a degree in Mechanical Engineering, but have been a mechanic for nearly 40 years,) but STAY IN SCHOOL and...
  14. thruthefence

    how air-tight are auto combustion chambers

    "Of course the cumulative result of the blowby was a noticeable volume of crankcase fumes out the vent (no PCV)" I had a similar run out engine (in an econoline van) that I simply vented the crankcase vent (disconnecting the road draft tube) to a 1 gallon clorox jug, loosely filled with teflon...
  15. thruthefence

    Aluminum Wiring

    Piper Aircraft used aluminum wiring in a ton of models, back in the 1970's. Primarily in the larger power wiring, battery to Buss, Ground & starter cables, & so forth. Piper SB836A required inspection & replacement, but apparently it wasn't serious enough to warrant an Airworthiness Directive. I...
  16. thruthefence

    helicopter rotor help

    Be sure & tilt your swashplate 90 degrees ahead of where you want the helicopter to go.
  17. thruthefence

    The use of 400hz electrical components in aircraft

    Can someone enlighten me how the 400hz power common in transport aircraft came to be chosen?
  18. thruthefence

    Old Terminology Help

    Are you with the guys who acquired the Bell 47 TC? Saw the booth in Display in Dallas this spring; nice work, and a labor of love!
  19. thruthefence

    Old Terminology Help

    That's "Flange Down" representing the way the stiffing flange is oriented. No clue on the 50HI-14.
  20. thruthefence

    guidance for sheet metal repairs

    Just remember, it is not your job as an aircraft mechanic, to make the repair "better" or "stronger" then the original pre dammage configuration. If you do, (or allude to such in your repair documentation) It then becomes not a "repair", but an "alteration", which you have to justify in all...

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