Rebuttal originating from the wisdom of Stealth[cro]
beatspete, I find thine reasoning a twinge incorrect.
Turboprob engines, be they ye simplest form known to man, can indeed reach out into the yonder at mach .5 . Their average airspeed velocity dost not exceed that of an unladen african swallow.
How do you know so much about swallows?
But how fast can it go carrying a coconut?
(my mate is monty python finatic)
Rebuttal originating from the wisdom of Stealth[cro]
Turbofan engines, be they ye product of times past the second war, can reach into the high sub-Mach speeds, but they be not of civilian creation. I remindeth thee of the F-4 Phantom and the A-10 were both of turbofan construction.
Balderdash I sayeth!
Balderdash! (spelling?)
A-10's max speed is around 420mph. Other than this being the official speed from the powers that be, an a-10 will never go supersonic in level flight. If you dropped it nose down, it might, but the engines dont have supersonic intakes, without the diffusion required to reduce the flow speed to something acceptable for the fan.
The formation of localised supersonic shockwaves would probably stop the aircraft going supersonic through the drag, regardless of the engines ability.
http://www.af.mil/factsheets/factsheet.asp?fsID=70As for the F-4 Phanton, it was flying before turbofans were invented - 1958 first flight.
"Power plant: Two 17,900-pound-thrust General Electric J79-GE-17 jet engines
Speed: 1,485 mph (max.) "
from...
http://www.boeing.com/history/mdc/phantomII.htm"The J79 is a single-shaft re-heated turbojet engine "
Not a turbofan then. (from
www.mtu.de)
Doesnt mean that there are no supersonic turbofans. Low bypass ratio turbofans, are used by the Euro Fighter (rolls royce EJ2000), and a few others...
However a high bypass ratio turbofan will
never go supersonic, in the way that a propellor (unless specially designed) will not. The speed of the flow into the engines needs to be quite low, and unless you built a
massive intake duct, with huge drag, might i add, supersonic will never happen.
Rebuttal originating from the wisdom of Stealth[cro]
Military engines can indeed reach Mach 3, but them as achieved it hath been known to undertake speeds even higher, from mach 3.2 by a russian Foxbat to that of an SR-71 Blackbird, which reacheth speeds past Mach 5.
SR-71, from aerospaceweb.org...
"PERFORMANCE:
Max Level Speed at altitude: 2,275 mph (3,660 km/h) at 80,000 ft (24,385 m), Mach 3.35 [world record]"
Not mach 5. Thats a rumour for people who live too close to airbases and take too many drugs.
Rebuttal originating from the wisdom of Stealth[cro]
Ramjets and scramjets indeed can be used from a range of Mach 5 beyond, but them that art used needeth high altitude to launch. Sixty thousand feet being the minimum, rarely reached by any plane. The knowledge contained within the engines hath potential uses, but many moons wilt pass until the knowledge be put to use.
More balderdash! Stratcomm seems to know his stuff, however.
Beatspete - resident Aerospace Master. Would 'Aero-Lord' be more fitting, given the recent theme?
Well, unchallenged HLP Aero-lord as yet. Interesting title...
hint hint...?
