The new surface was shown to have a 20% improvement in stiffness and strength over the original, as well as reducing aerodynamic drag. The prototype was tested by static loading using sandbags in a welded steel jig, simulating an aerodynamic load, while measuring the distance of deflection, and eventual failure point, to identify weak points and stress concentrations. Two layers of biaxial carbon fiber cloth are separated by a solid foam core, with bolted hinge attach points. Carbon fiber will not corrode, and is an extremely stiff material. The dimensions and mounting hardware are unchanged from the original surface, allowing a direct swap onto the aircraft, with no changes to controls, trim, or cable routing. In this project, a cored carbon fiber composite material was used to construct a prototype. A complete replacement is needed, but cannot be constructed of aluminum due to its weight. Aerodynamic flutter, from flexibility in the lightly built surface, and corrosion can cause breakup in flight, and has grounded many aircraft. Magnesium was chosen by the designers for its lightweight properties, but corrodes badly and is becoming difficult to source for replacement parts. The V-tail Bonanza uses a unique “ruddervator” system, which combines the rudder and elevator into one surface to reduce drag, controlling the pitch and yaw of the aircraft. Ruddervator counter balance assembly weights. On October 15, the foundation announced that the ABS/ASF Manuel Maciel Ruddervator STC Prize of 500,000 will be awarded to the first firm that certifies and markets kits to replace ruddervator skins on V-tail Bonanzas covered by Type Certificate 3A15 or Type Certificate A-777. Both assemblies balanced to 18 inch-pounds. Bonanza Society boosts ruddervator replacement design prize. These assemblies were confirmed to be in balance corresponding to the current Beech methods and current AD's and SB's. Control surfaces on aircraft must be light, and precisely balanced. One ruddervator is factory original the other has been re-skinned utilizing rivets for assembly. Over 10,000 were built, but with the weakness of magnesium skinned control surfaces. Phone number there is 31.The Beechcraft V-tail Bonanza is a popular general aviation aircraft. Magnesium Alloy AZ31B sheet Cold rolled, partially annealed Thickness: 0.016 - 0.0249 inches Tensile strength: 39 Yield strength 0. Aircraft Spruce most likely has it, but an expert in this field is Neil Pobaanz of the American Bonanza Society. American Bonanza Society wrote:From a non-Beech but very knowledgeable source: The original magnesium specification for BE35 ruddervator skins is AMS 4377. Thank you for your hard work which the finishing world, and we at, continue to benefit from. Ken Vlach į honored Ken for his countless carefully Also, SanChem has a a chrome-free conversion coating for magnesium, SafeGard 3400Mg.
Mfg's Manual calls for a mixture of Chromium Trioxide & plaster of Paris solution in water applied to the skin, a kit called Dow19 however I can't find it anywhere and I have to treat these surfaces pronto !Ĭan anyone out there tell me where I might secure this Chromium Trioxide or Chromic Acid (technical-grade) or DOW19 kit ?ĭoes anyone else know of another corrosion inhibiting process that would allow me to paint over it once it's applied ? Thom Barlow A&P IAįAA Certified Aircraft Mechanic - Wesley-Chapel, Florida, USAįirst, be aware of the many EPA and OSHA restrictions on the traditional hexavalent chromium processes for magnesium.Ĥ3297 for magnesium pretreatment info.
There's a fair amount of surface corrosion on the skins and I've sanded the parts with 320 and 400 grit aluminum-oxide but now I need to pickle the skin before I spray the Epoxy Primer & Polyurethane Topcoat. It turns out his Flaps & Ailerons are magnesium. There's a fair amount of surface corrosion on the skins and I've sanded the parts with 320 and 400 grit aluminum-oxide but now I need to pickle the skin before I spray the Epoxy Primer & Polyurethane Topcoat. A Beech Bonanza owner asked me to strip & paint his wings from a very early model 'V-Tail'. A Beech Bonanza owner asked me to strip & paint his wings from a very early model "V-Tail". Nose gear steering stops bent or out of adjustment. On the landing gear: Bent shimmy damper shafts. Flight cable pulleys not rotating freely. Flap limit switch rollers frozen or rusted. "Treating old Beechcraft "V-Tail" Bonanza magnesium Flaps bare metal before painting" Outboard Ruddervator or elevator hinge bearings and bushings so worn as to possibly cause a vibration. Most things are possible but what is the problem with this thinking For example, doing away with the canard but implementing a flap system along with the belly board could allow the wing itself to be reduced in. It's Monday 02/07/22 & your Q or A is Welcome.Ĭhime right in! (a "no registration" site) Could the Long Eze be fitted with a ruddervator to overcome some of its short field characteristics thereby improving performance.