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Each type of helicopter has a specific airspeed at which a power-off glide is most efficient. The best airspeed is the one that combines the greatest glide range with the slowest rate of descent. The specific airspeed is different for each type of helicopter, yet certain factors (density altitude, wind) affect all configurations in the same manner.
MathOverflow is a mathematics question-and-answer (Q&A) website, which serves as an online community of mathematicians. It allows users to ask questions, submit answers, and rate both, all while getting merit points for their activities. [1] It is a part of the Stack Exchange Network, but distinct from math.stackexchange.com.
The charts show the added lift benefit produced by ground effect. [ 3 ] For fan and jet-powered vertical take-off and landing (VTOL) aircraft, ground effect when hovering can cause suckdown and fountain lift on the airframe and loss in hovering thrust if the engine sucks in its own exhaust gas, which is known as hot gas ingestion (HGI).
An HTK was tested with twin Boeing 502 turboshafts in 1954, this was the first twin-turbine helicopter. K-240 company designation from HTK-1/TH-43E K-600 proposed civilian counterpart of HOK-1 [29] K-600-3 civilian counterpart of H-43B [29] K-600-4 company designation of HOK-3 development [29] K-600-5 HH-43F [30] XHTK-1 two two-seat aircraft ...
The MC-4C was slightly larger than the MC-4. When the MC-4C was certified in 1953, it was the first tandem-rotor helicopter to be certified in the United States for commercial use. Three examples were evaluated by the United States Army as the YH-30, but the Army's evaluation showed the helicopter to be underpowered. [1]
Stage 3: a steep decrease of the lift coefficient (lift break, lift stall) occurs as the DSV passes into the wake. Rotor map of dynamic stall locations for all conditions. Stage 4: full separation of the flow on the upper surface of the airfoil can be observed, accompanied by the peak of nose-down pitch moment.
Bettors are continuing to side with the favorites ahead of the College Football Playoff semifinals.. Both Notre Dame and Ohio State were getting the majority of money at BetMGM ahead of the Orange ...
Airframe age and losses led to the Armed Reconnaissance Helicopter program and the Bell ARH-70, which was canceled in 2008 due to cost overruns. The third replacement effort was the Armed Aerial Scout program. [50] Due to uncertainty in the AAS program and fiscal restraints, the OH-58F's planned retirement was extended from 2025 to 2036. [51]