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www.AviationPros.com 29 to explain the reverse engineering process. It does not always have to include all the described steps, some may be obsolete but sometimes some may be added — all taking into consideration the condition of the original part and many other factors. This text describes a vintage airplane, engine crankcase remanufacturing done with a highly digitized process of two French companies: Ventana and Vintair. It is just an example of new remanufacturing possibilities offered by the use of modern technologies and proven traditional skills. It can be used in many fields like mechani- cal parts, sheet metal, molded parts, etc. THE STAMPE SV4 - BIPLANE The Stampe SV4 is a French aviation milestone. The Stampe, a little biplane, is part of the French aviation heritage and is famous for having been widely used in army and civilian flying schools in late '40s and early '50s. 850 airplanes were built in 1946-47, as an after WWII war recon- struction effort. The Stampe was built in France under license, and is based on a Belgian design from 1936. Those French- built Stampes were equipped with a 145- hp Renault, four-stroke, four-cylinder, in- line engine. Stampe features nice aerobatic capabilities, delightful handling, and has become a myth in the French aviation com- munity. More than 200 airplanes exist, and are close to, or in a flying condition. MATERIAL FATIGUE AS THE LIFE LIMITING FACTOR One of the most challenging problems to keep Stampes flying is to find spare aluminum crankcases for the Renault engine. In-service crankcases and the (rare) spares available have logged a considerable number of hours. Like all light alloys parts they are subject to cyclic loads, where material fatigue is limiting their life. Many of the inspected crank- cases show fatigue cracks. Metallurgic analysis of the crankcas- es showed poor mechanical resistance, caused by impurities and internal corro- sion, making the welding repair highly uncertain. Because of this, some users started to consider moving to another engine. This is a very costly option, and no other engine allows it to stay close to the appearance and handling of the historic Stampe. For those reasons it was decided to remanu- facture the crankcase using Ventana's new techniques and Vintair reverse engineering skills offering a historically correct solu- tion to the part shortage. Hawkeye ® Videoscopes Fast, Reliable, Affordable, Visual Inspection! • Sharp, Clear Photos & Video • Large 5-inch LCD Monitor • Easy-to-Use Controls • Annotation Feature • Rugged Tungsten Sheathing • Quality Construction • Precise 4-Way Articulation • Starting at only $8,995 In stock, ready for overnight delivery! Hawkeye ® V2 Video Borescopes are fully portable, finely constructed, and deliver clear, bright high resolution photos and video! The 5" LCD monitor allows comfortable viewing, and intuitive, easy- to-use controls provide photo and video capture at the touch of a button! V2's have a wide, 4-way articulation range, and are small, lightweight, and priced starting at only $8995. V2's are available in both 4 and 6 mm diameters. Optional 90° Prism and Close-Focus adapter tips. VIDEO BORESCOPES 90° Prism & Close-Focus tips available! TRY BEFORE YOU BUY! (US ONLY) gradientlens.com 800.536.0790 Made in USA Visit us at: Booth #8706 • Dallas, TX March 7 - 9, 2017 AviationPros.com/company/10136580