Today's Message Index:
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1. 01:42 PM - Cracks in Main Landing Gear Legs of Thom Riddle's Allegro (Hugh McKay III)
2. 01:43 PM - Stall Warning System (Hugh McKay III)
Message 1
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Cc: "Michael Skolochenko" <dawnflyer44@hotmail.com>
| Subject: | Cracks in Main Landing Gear Legs of Thom Riddle's Allegro |
Guys:
I have looked at the photos sent by Thom and based on my knowledge (as a
structural engineer) of the flexing mechanism of the legs during landings
(hard or soft), the top portion of the legs at the point where the cracks
are located are put into compression upon impact of the wheels with the
landing surface (i.e. the legs flex outward putting the top surface of the
gear where the cracks are located in compression while the bottom surface is
put in tension). From the photographs the cracks look like classical fatigue
failure of FRP (Fiberglass Reinforced Plastic) material. The cracks appear
to be transverse cracks across the laminations, which is a classical failure
due to cyclic stress, even though I cannot fathom the number of landings it
would take to do this unless they were landings that were over stressing the
material each time.
I admit that I have not actually examined the legs or the cracks, but that
is what it appears to be. Thom, I would suggest you have the damage legs
examined by an expert in forensic analysis to give you a better professional
opinion of why the failure cracks are appearing. This may indeed be a design
flaw, or the result of severe landing impacts. Does anyone know if Fantasy
Air did cyclic loading of the landing gear, or just a static load test. If
you return the legs to Fantasy Air USA, I assure you, you will get no
meaningful answers from them.
Hugh McKay
Message 2
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| Subject: | Stall Warning System |
Can anyone briefly explain to me the components of the Allegro 2000 stall
warning system? I am building a 2000 from the Quick-Build Kit and am to
install the stall warning system. I am obviously short some of the parts and
am having difficulty getting what ever the parts are from the US
Distributor. Basically I know that the pressure port on the leading edge of
the wing is connected via tubing to the special airspeed indicator through a
pressure switch in some manner. I also know that the type airspeed indicator
I have has an electrical connection on the back that is related to the stall
warning system. That is all that I know at this point. Can some one out
there help me in this? Do I have all the parts or not? A schematic one line
diagram showing how the system is connected indicating the separate parts
would save the day for me. Cant get any help from my Distributor or Dealer.
Help!
Hugh McKay
6009 South NC Hwy. 16
Maiden, NC 28650
hgmckay@bellsouth.net <mailto:hgmckay@bellsouth.net>
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