Wheel Landing

[Colonel]

[quote]they didn't want to divert[/quote]

Oh my.  Here's the thing.  When shit goes south
in the air, you really don't know what's happened
for sure until after you land and they tear it all
apart, days later.

Get it on the ground.

[Chris]

Jesus...


[img width=500 height=352]https://upload.wikimedia.org/wikipedia/ ... N4522V.JPG[/img]


[quote]After repairs were made to the plane, it returned to service on April 25, 1985. It continued in service for nearly 12 years until it was leased to China Airlines' sister company, ][url=https://en.wikipedia.org/wiki/Mandarin_Airlines]Mandarin Airlines[/url] on January 1, 1997, and was in daily service for the remainder of that year. Mandarin then sent it to[url=https://en.wikipedia.org/wiki/McCarran_ ... al_Airport]McCarran International Airport[/url]for storage. From April 2002 it was owned and operated by a religious organization known as Gospel to the Unreached Millions (GUM), headed by[url=https://en.wikipedia.org/wiki/K._A._Paul]K. A. Paul[/url], and was christened '[url=https://en.wikipedia.org/wiki/K._A._Pau ... _Peace_One]Global Peace One[/url]'. On July 17, 2005 the [url=https://en.wikipedia.org/wiki/FAA]FAA[/url] suspended its operating certificate due to insufficient maintenance.[/quote]


So after a massive overstress event that tore chunks of the plane and permanently bent the wings it went back into service for 20 years until the operator was shut down. That's one hell of a machine.

[Colonel]

Sure as hell is.  Don't listen to any four-bar tell
you about what a hero you have to be, to fly a
Boeing.  They're tough as nails and will take
ridiculous abuse from ham-fisted clowns.

[Colonel]

Another wheel landing gone bad ...

[url= skipping the first 5 minutes[/url]

Note that things again go bad, when
the tail comes down.  More conventionally,
the nose goes right as the tail goes down,
perhaps from gyroscopic precession, perhaps
not.  Couldn't see any crosswind.

Sure is a heavy load on that left main gear.

PS  Crank up the volume just before the
groundloop.  Hear the tailwheel?  Doesn't
sound healthy.

[ScudRunner-d95]

[quote author=Chris link=topic=4918.msg12643#msg12643 date=1479747038]


So after a massive overstress event that tore chunks of the plane and permanently bent the wings it went back into service for 20 years until the operator was shut down. That's one hell of a machine.
[/quote]

They don't build them like they use to ?

[Chris]

[quote author=ScudRunner link=topic=4918.msg12666#msg12666 date=1479789577]
They don't build them like they use to ?
[/quote]


Engineers these days are more interested in shaving every ounce and pushing stress margins to the limit. Although in fairness when Bombardier did the ultimate load test on the CSeries wing they weren't able to break it. The rig ran out of travel before the wing failed.

[Colonel]

[url=https://en.wikipedia.org/wiki/American_ ... Flight_587]https://en.wikipedia.org/wiki/American_ ... Flight_587[/url]

Compare the 747 with the airbus, where if you touch
the rudder pedals, the vertical fin comes off.

[quote]According to the NTSB, this aggressive use of the rudder controls by the co-pilot caused the vertical stabilizer to snap off the plane.

The Allied Pilots Association, in its submission to the NTSB,
argued that the unusual sensitivity of the rudder mechanism
amounted to a design flaw which Airbus should have communicated to the airline.

The main rationale for their position came from a 1997 report
that referenced [b]10 incidents in which A300 tail fins[/b] had been
stressed beyond their design limitation[/quote]

[JW Scud]

[quote author=Colonel Sanders link=topic=4918.msg12611#msg12611 date=1479664343]
[youtube][/youtube]

With a shimmying tailwheel, and what looks like
a crosswind from the left.  Notice the right rudder
deflection as he slows down.  Doesn't look like
he got much help from the tailwheel steering,
or the right brake.  Can't see the ailerons.

I keep telling people to make sure their tailwheel
is in good shape ... might make the difference as
to whether you wreck or not.

I'm not as bright as the average TC Inspector
but regardless of all the above, with a long
paved runway and the nose going left, a burst
of power might help make the right rudder more
effective.  If you run out of runway, leave the
power on full and get the hell out of there and
find another runway that's more into wind.
[/quote]

Thanks for the info Colonel and good advice to think about. Perhaps if the tailwheel starts significant shimmying, add full power and get out of there and then find a decent grass runway(if possible) which seems to usually be better and more forgiving.

Here is another groundloop

[cgzro]

Tail wheel shimmy is often made worse by heavier loads on the tail wheel ie with a pax. This is because the weight bends the leaf springs more which changes the rake angle of the fork pivot. That rake angle is critical and as a result pushing gently forward on the stick can alleviate the problem, but you still needto fix the loose springs eventually and of course you need to be going slow enough. Obviously directional control needs to be maintained irrespective of shimmy.

[Colonel]

People don't understand how much energy there
is in tailwheel shimmy. 

It's like taking a hammer to your tailpost.

Don't do that.