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  • Users: verymadmac
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  1. verymadmac

    Too many bolts removed from pylon footings

    Transpower chief executive Alison Andrew says a power pylon that fell last Thursday was due to contractors removing too many nuts I guess someone read the work order wrong. https://www.rnz.co.nz/news/national/520400/transpower-makes-announcement-after-major-northland-outage
  2. verymadmac

    Mirage Ditching

    This is pretty impressive,I would have never really considered one could ditch a modern fighter with so little apparent physical damage, the slats, intakes and the eleveons appear still intact.I can also mentally hear the fizzing from here...
  3. verymadmac

    Orgins of Occupant Mass

    So for FAR23 "post dynamic seats", "pre ASTM", the minimum occupant mass is 215 lb. Can any point me in the direction of a report regarding the origins of this limit, it doesn't seem to be in NPRM. Basically I want to know does it have a statistical basis. My current interest is regarding a...
  4. verymadmac

    Regent Sea Glider

    Unless my memory is incorrect, WIG operate at height about wing chord above the surface. If so this seems to be a seaplane sold as a WIG, to avoid aviation associated Issues (lessons) that would come from calling it an aircraft. So I guess more investors money for buzz word bingo projects...
  5. verymadmac

    Suez Canal blocked by container ship

    It might not be an engineering issue that started it, but I bet is going to change a few specifications. BBC piece here Link It looks like the bow is hard aground, refloating will be an interesting exercise given the time pressure. Canal profile is here...
  6. verymadmac

    Dynafocal Mounts

    I have a couple of questions relating the practical effects of in service wear on Lord Dynaflex engine mounts (type I). Basically the issue is to get a handle on how much the engine moves in the Dynaflocal mounts and what additional movement there is due to wear (this is a GA airframe with a 6...
  7. verymadmac

    Secondary Composite Structures

    I am working on prepping for certification of a carbon fibre helicopter belly tank (So restricted Cat, secondary structure, FAR27). The regularity requirements (not located in the US) now include the FAA's Rotorcraft Directorate Policy on Secondary Composite Structure (policy attached). I am...
  8. verymadmac

    Camloc

    I am designing an engine cowl and the associated attachments for a small turbo prop aircraft. In some places it will be attached with Camloc's. There is very little about on the pros and cons of the 2700 series and the 4002 series. Within the 4002 series there is the swaged retained grommet and...
  9. verymadmac

    Compliance by copying

    Hi A few years ago I came across an FAA AD that I think grounded an aircraft type (or revoked the TC), because its compliance had been justified on the basis that it was a exact copy of an existing Type Certified Aircraft. I can't remember the aircraft type and am not having any luck finding...
  10. verymadmac

    Blind rivets in dimples

    HI I have a repeat bug barer on a part 23 aircraft, in that there is numerous places that its uses cherry maxs in dimpled skins. Every once and a while I end up with a repair on my desk that needs strength data for these. Does any one know of strength data for cherry maxs in dimples, I have...
  11. verymadmac

    Class E freighters with supernumeraries

    Hi I work for a air freight operator with that runs aircraft with 3rd party cargo conversions. I keep running into issues regarding the equipment side the conversion (non conformities at best), plus we have a supernumerary installation is a work in progress, with inflight access to the hold...
  12. verymadmac

    Extruded Shim

    I have an aircraft which has had part of a tapered shim, extrude out from under a fitting. It appears to be just the corner of the shim so support has only been lost under one end fastener. While replacement of the shim is desirable , the aircraft is only 600 hours from C check. It appears...
  13. verymadmac

    Propeller Blockage factors

    HI I am looking for a method for calculating the thrust loss due to propeller body interactions (due to the increase in local velocity & pressure effects). I currently am using the S.B.A.C. Standard Method of Propeller Performance Estimation, but would like to find a second method to estimate...
  14. verymadmac

    Minimum bend radius

    I am trying to work out how a manufacturer put a ninety degree bend in a component 0.125” thick 2024-T42 with a bend radius of about 0.094”. The minimum bend radius charts give 0.250” when folded prior to heat treatment. This part is a flap bracket for a light aircraft and has not shown any...

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