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djpacro

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Posts posted by djpacro

    Cessna 180 inflight break up

    in Aircraft Incidents and Accidents

    Posted

    The next question is - why have there been so few in flight damage or break-up problems reported or attributed in accident reports over the years?  

    ......

     

    happy days,

    I guess that many are saved by the 50% margin between limit load factor (where the structure may deform) and ultimate load factor (structural failure) - I know of quite a few. These generally don't appear in accident reports.

     

    That Musketeer many years ago with buckled main spars and wing skins. Twisted steel tube truss, broken longerons, wing ribs broken etc on aerobatic airplanes.

     

    Still too many Aero Commanders with catastrophic wing failures not to mention Cessna 210s and Tiger Moths.

     

    https://www.flyingmag.com/technique/accidents/aerobatic-pilot-survives-extreme-failure

     

     

    Cessna 180 inflight break up

    in Aircraft Incidents and Accidents

    Posted

    This is a very real subject for concern.

    .....

     

    My RV9A is also quite a Va exercise. It is quoted as having a Va of about 109-112KIAS in the VANS references, but I can't make that number work.  My Vs at MTOW of 795 kg is 53KIAS, and using 3.8 LF  this calculates out to a Va = 103K ....

     

    Now, the question arises - why are manufacturers Va numbers higher than my calculations from the accepted formulae?  Could our Vs observations be in error due to the blurry stall characteristics of many RAA types? Is it an attempt by manufacturers to present their aircraft as 'tougher' and more 'capable' than competitors?  Cessnas are somewhat the same: I could never calculate a Va for any of my many aircraft over the years which was closer to theirs than 10 KIAS.

     

    ....

     

    happy days,

    1. Calculations must be done using CAS not IAS - that usually resolved most differences.

     

    2. The flight envelope is determined at design stage, before the aeroplane has flown, based on estimated stall speed. The actual stall speed is often different than estimated and some manufacturers don’t bother revisiting the flight envelope! I can provide an example of this.

     

     

    • Agree 1
    • Informative 1

    Guess This Aircraft ?

    in AUS/NZ General Discussion

    Posted

    This is another case of finding an aircraft, then people guess a derivative. The MICCO SP-20 was modified from a Meyers 145 with a new engine and new type certificate. The depicted aircraft is listed as a Meyers 145A. Interesting history of the 145 here.

    I wasn't aware that any of the Meyers had a sliding canopy. I googled a bit and see that there are a few examples of Micco Aircraft Company MAC-145A?

     

     

    Calculating the radius of a skidding turn

    in Student Pilot & Further Learning

    Posted

    Yep, Jim is hard work to follow but he has much info available.

     

    "In pilot school, you might have been taught to “hold the nose up” during a turn. If so, did you ever consider that advice could kill you? Consider the fundamental fact that certified airplanes do not stall; pilots cause airplanes to stall."

     

    http://www.dylanaviation.com/stick-and-rudder-what-does-that-mean/

     

    http://www.dylanaviation.com/avoid-loss-of-control-use-the-tape/

     

    http://www.dylanaviation.com/bad-habits-and-improper-turns-can-be-deadly/

     

    http://www.dylanaviation.com/dont-stall/

     

     

    • Informative 1

    Built up areas

    in AUS/NZ General Discussion

    Posted

    Use of the VFR lane would be taken to be CASA approved. ..... The term "built-up area" is not defined specifically ...

    Taken to be approved, eh? CASA approvals are very specific. Many years ago I tracked through and found a definition of “built-up area” wrt aviation and it was, from memory, places which had street lights. Who knows what it is these days.

     

     

    Proposed Wing Spar AD for PA28 and PA32 aircraft

    in Piper

    Posted

    Back when Australia had its own certification requirements: http://services.casa.gov.au/airworth/airwd/ADfiles/under/pa-28/PA-28-058.pdf

     

    The PA-28 and others with initial certification many years ago (CAR 3 with a smattering of FAR 23 tossed in for later models) in the USA were not required to have any fatigue life assessment. An aluminium structure will suffer metal fatigue just a matter of when and if inspection picks it up.

     

    I like my FAR 23 certified aerobatic airplane with its lifed items.

     

     

    CASA EX25/18 Class 1 to Class 2 Medical

    in Governing Bodies

    Posted

    I don’t understand the question? If you get a Class 1 medical then you also get a Class 2 with a later (normally) expiry date. So, just let the Class 1 expire and until then just state that you are exercising the privileges of your licence with the Class 2 medical.

     

    I was one of those who renewed early this year when we knew the new rule was coming in but no idea when in 2019. As it turned out I had just completed my Class 1 tests so when CASA suddenly announced the new rule would take effect a week later I simply asked my DAME to withdraw my application for a Class 1 and proceed with just the Class 2.

     

     

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