Giacomo Freddi’s Post

#vehicledynamics#nptel Basic calculations in Vehicle dynamics taken from nptel FBD , Aerodynamic force

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US hypersonic vehicles may soon ‘sweat’ to stay cool, says RTX The system consists of a network of tiny channels embedded in the leading edges of the hypersonic vehicle, which are the parts that face the most heat. Imagine flying faster than five times the speed of sound and reaching any destination in the world in hours. This is the vision of hypersonic flight, which can potentially transform the future of aviation. Ablation However, achieving this feat is not easy, as it involves overcoming extreme temperatures of over 2,200 °C (4,000 °F) that can melt or damage most materials. The phenomenon called 'ablation' deforms any vehicle's angular shape post the speed of Mach 5 due to intense heat, which affects the overall performance of the vehicle and efficiency. The cooling system is similar to human sweat glands. RTX  To solve this problem, the RTX Technology Research Center has developed a novel idea: make the hypersonic vehicles sweat like humans. The center, which is working under a contract from the US Defense Advanced Research Projects Agency (DARPA), has developed a cooling system prototype that mimics the human body's natural way of regulating heat. USAF considers mounting hypersonic missiles on B-1B ‘Lancer’  • Florida test was the Army's 'Dark Eagle' hypersonic missile  • Venus Stargazer: Hypersonic jet could reach Tokyo from San Francisco in just one hour  • France test launches its V-Max hypersonic glider for first time The system consists of a network of tiny channels embedded in the leading edges of the hypersonic vehicle, which are the parts that face the most heat. These channels deliver a liquid coolant to the vehicle's surface, where it evaporates and takes away heat. This way, the vehicle can maintain its shape and aerodynamics, which is crucial for stable and efficient flight. John Sharon, the center's project team leader, said that they used predictive modeling and advanced micro-machining to create a test article that resembled a credit card with a wedge shape. They then exposed it to two different heat sources: a burner rig that was like a giant crème brûlée torch and an electrical arc that simulated the conditions of hypersonic flight. The team found that the test article survived both tests without any significant damage, proving the feasibility of their concept. The next step, Sharon said, is to scale up the test article to the size of an actual hypersonic vehicle and make the channels even smaller for better performance. He added that the same technology could also be used for other applications, such as protecting gas turbine blades from heat. Sharon praised his team for their innovative work and said they faced a tough challenge. "When you're flying https://lnkd.in/db-3H3cu

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DSM (Digital terrain module) created by aircraft AUTEL EVO 2 V3 PRO #topsurvey #autel_evo2 #aerial_mapping #pointcloud

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Looks nice, Aero efficient but bad in icy weather! This video shows the design flaw of door handles like this in a winter condition. Credit to the owner. #automotiveengineering #automotiveindustry #automotivedesign #automotive #ev #aerodynamics

Internal testing is a mandatory part of the rotor blades creation process. One of them is the Rotation Speed (rpm) test. Based on the outcome we state the 1300 rpm with 50 kg load but the graph below shows the blades can withstand higher rotation speeds up to 1500 rpm.  #UAVOSengineer #unmannedhelicopter #compositesrotorblades Find out more: https://bit.ly/3LSTFTg

Internal testing is a mandatory part of the rotor blades creation process. One of them is the Rotation Speed (rpm) test. Based on the outcome we state the 1300 rpm with 50 kg load but the graph below shows the blades can withstand higher rotation speeds up to 1500 rpm.  #UAVOSengineer #unmannedhelicopter #compositesrotorblades Find out more: https://bit.ly/3LSTFTg