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"Porpoising" is a term commonly used to describe a particular fault encountered in ground-effect racing cars. Racing cars had only been using their bodywork to generate downforce for just over a decade when Colin Chapman 's Lotus 78 and 79 cars demonstrated that ground effect was the future in Formula One, so, at this point, under-car ...
The switched reluctance motor (SRM) is a type of reluctance motor. Unlike brushed DC motors , power is delivered to windings in the stator (case) rather than the rotor . This simplifies mechanical design because power does not have to be delivered to the moving rotor, which eliminates the need for a commutator .
Descent of a Martian lander halted by retrorockets (computer-generated impression) Soyuz space capsule retro-rockets cushion the landing impact A retrorocket (short for retrograde rocket) is a rocket engine providing thrust opposing the motion of a vehicle, thereby causing it to decelerate.
The first successful demonstration of an ion engine was NASA SERT-1 (Space Electric Rocket Test) spacecraft. [19] [20] It launched on 20 July 1964 and operated for 31 minutes. [19] A follow-up mission launched on 3 February 1970, SERT-2. It carried two ion thrusters, one operated for more than five months and the other for almost three months ...
And, of course, we couldn’t resist adding some festive tunes in the mix too (it is December, after all). As the ball drops on New Year’s Day, we’ll be playing these tracks and hyping ...
CVS Health's Caremark, Cigna's Express Scripts and UnitedHealth Group's Optum control the majority of the U.S. pharmacy benefit market, with their parent companies also operating health insurance ...
“Reheating leftovers in slow cookers, steam tables, or chafing dishes is not recommended because foods may stay in the "Danger Zone," between 40 °F and 140 °F too long. Bacteria multiply ...
The power for the thruster comes from the high pressure gas created during the decomposition reaction that allows a rocket nozzle to speed up the gas to create thrust. The most commonly used monopropellant is hydrazine ( N 2 H 4 , or H 2 N−NH 2 ), a compound unstable in the presence of a catalyst and which is also a strong reducing agent .