Citation X Question

Reply Subscribe

Page 5 of 5

Thread Tools

Search this Thread

12-05-2011, 09:32 AM

#41

Cubdriver

Moderator

Joined APC: May 2006

Position: ATP, CFI etc.

Posts: 6,056

Quote:

Originally Posted by samrebel

So, after reading this thread, I am inclined to believe that the fastest business jets can go slightly supersonic if pushed that far. I assume a strong normal shock is forming in the inlet near M1.0, but it seems like if the inlet isn't designed for supersonic flight, you risk putting the engines into compressor stall. How are they avoiding this?

Not necessarily a strong normal shock. You are correct to expect a normal shock at the face or leading edge of the turbine inlet, but not strong one at that speed, and adiabatic pressure losses are minor up to about M=1.5. You would see only a 10-20% pressure loss due to wasted energy up to M=1.5. Consequently the mass flow rate remains high, and the compressors can continue to grab clean air for plenty of time after passing through Mach speed.

Also, if to get the FAA to buy off on the mach dive test they could install a modified inlet just for the tests.

See Aerodynamics for Naval Aviators pg. 238.

01-18-2012, 11:19 AM

#42

Cubdriver

Moderator

Joined APC: May 2006

Position: ATP, CFI etc.

Posts: 6,056

Citation Ten Prototype Flies

(R. Niles, AvWeb, 1/17/12) "Cessna celebrated the first flight of its Cessna Ten, a faster and updated version of the Citation X that may preserve Cessna's title to the fastest business jet. Cessna says the Ten will do 527 knots at maximum cruise with a maximum range of 3242 nm. Although it looks like a Citation X, it's actually about 15 inches longer and the Rolls Royce AE 3007C2 engines also give it a certified ceiling of 51,000 feet. "Our first flight, today, was a great success. We have a great team working on this project and I know they will take this dominant aircraft up a notch," said Kelly Reich, business leader for the Cessna Citation X and Ten, in a news release..."