Ali Oskoei’s Post

Because of the wide variety of possible trajectories for #hypersonic gliders, finding the right way to visualise the relevant information from my #simulations can be a challenge. This is one attempt, which I think ended up looking quite pretty. So what is it? The background colour indicates the maximum lateral acceleration a particular glide vehicle can generate as a function of the altitude and the Mach number. This primarily depends on the dynamic pressure, which increases with decreasing altitude and with the velocity squared. However, it also depends on the aerodynamic configuration of the RV; specifically on the maximum trim angle of attack and the associated lift coefficient, which also are a function of the Mach number and altitude. All of these variables change during the glider’s flight, so an individual trajectory can be represented by a trace on this plot. The white traces are individual skipping trajectories from a scenario. They start at the top right-hand corner, with a descent from 55 km at close to Ma=10, followed by a pitch-up manoeuvre that starts around 25 km. Near the peaks of the skips, the altitude becomes large, and the RV cannot manoeuvre. Because the speed decreases after multiple skips, the maximum acceleration also decreases. Finally, in the lowest part of the trajectories, below 20 km, the velocity decreases rapidly. While most of the impacts are supersonic, none are above Ma=2.5.

Furious Motor 100160 85KG thrust BLDC motor for jet ski, electric boat and go-cart boat, the ultimate powerhouse for underwater thruster. Dimension: 100mm * 160mm KV: 130 Suggested ESC: 75V 300A Max. Thrust: 85KG Max. Torque: 16Nm Max. RPM: 9300 Max. Voltage: 72V Max. Current: 220A Maxi. Power: 16KW Li-Po: 12S - 20S Weight (motor): 5.5KG

Imagine a cyclist riding in still air. The wind experienced by the cyclist is solely due to their movement, meaning there is no actual wind speed, but from the cyclist's perspective, there is wind. Where on the cyclist's body does the dynamic pressure reach its maximum? A. At the sides of the arms, torso, and legs B. At the front of the arms, torso, and legs C. At the back of the arms, torso, and legs D. Nowhere, it is zero at all positions on the body Think one more time! Hint: Dynamic pressure is the pressure exerted by the movement of a fluid, like air, and it depends on the velocity of the fluid. It's calculated using the equation Half row V Square Okay lets roll it: For a cyclist riding in still air, the only wind they experience is due to their own motion. However, at the surface of their body, the air is at rest relative to them, meaning the velocity V is zero. Since dynamic pressure relies on the fluid's velocity, and this velocity is zero at the cyclist's body, the dynamic pressure is zero at all points on their body. Bonus: On the other hand, static pressure is the pressure exerted by a fluid at rest and is not zero at the cyclist's body. In front of the cyclist, there is an overpressure due to the air being pushed against their body, which contributes to aerodynamic resistance. Behind the cyclist, there might be a slight underpressure, but it's close to zero Pascal. So, while static pressure varies around the cyclist, dynamic pressure does not reach a maximum anywhere on the body. The correct answer is: D. Nowhere, it is zero at all positions on the body.

Flip flight case for Behringer X32 full size with dockhause 12cm depth

Turboo Tripod turnstile K149---My favorite tripod turnstile Size: 1400*280*980 Strong body Heavy Duty, Both indoor and outdoor

Did you know a quad bike is also known as an all-terrain vehicle (ATV)? The term "quad" is short for "four-wheeled," which refers to the four low-pressure tires on the vehicle that allow it to navigate a variety of terrain. Start the engine and let the fun begin: https://lnkd.in/g6vNqaxG

Thanks followers and investors for the great questions. Let's answer one we received a few times to date. Q: "Will Trident LS-1 be able to go off-road in say loose sand to get to the water off a beach?" A: AWD and up to 12" ride height clearance will allow limited off-road travel, for beach access to water through medium to hard pack sand. Very loose sand may be an issue depending on the tires selected. Trident LS-1 with reverse trike (2 wheels in front, one wider one in rear) AWD is not being designed for "aggressive off-road travel". (sketch below shows the 3 default ride height positions - user adjustable in between these 3 positions may be possible as well) #TridentLS1 #EVs #electricvehicles #electrichydrofoils #electricboats

Pedalling Efficiency Rig: Aerodynamic Resistance. Whilst riding on the Pedalling Efficiency Rig, the bike will generate its own resistance and losses through the tyres, drivetrain, bearings etc, however there will be no aerodynamic drag for the bike and rider to overcome. To compensate for this, aerodynamic resistance will be applied to the roller via a magnetically powered brake, based upon wheel speed and a drag-velocity profile of a rider of a given CdA, taken from Wind Tunnel data. Therefore, the resistance applied will be representative of what a rider would encounter in the real world for a given speed. #PER #pedallingefficiency #marginalgains #sportsperformance #sportsengineering #drivetrainefficiency #rollingresistance #framestiffness

Wheel Base ℹ️ℹ️ℹ️ By “wheel base” we mean the distance of the operating line through the wheel axles of the main landing gear to the centre point of the nose gear or tail gear. Track By “track” we mean the distance between the far right and the far left main wheel. In the case of tandem wheels, track is the distance measured to the centre of the bogie beam.