---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Sat 05/27/06: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 01:42:52 PM PST US From: "Hugh McKay III" Cc: "Michael Skolochenko" Subject: Allegro-List: 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 _____________________________________ Time: 01:43:15 PM PST US From: "Hugh McKay III" Subject: Allegro-List: 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