SCAT15F
Topic Author
Posts: 678
Joined: Fri Feb 09, 2007 8:34 am

Orion 21 Top Speed?

Tue Feb 12, 2013 5:46 am

Wondering if anyone has any info on the top speed of the Lockheed Martin Orion 21 which lost to the P-8. It was essentially the same airframe as the P-3 but with 7150 hp PW150's.

The P-3 set a speed record back around 1970 of 501 mph with 4509 hp Allison T-56's. It's listed top speed was 473 mph. The Orion 21 does have a heavier MTOW, but has the same frontal area, 10,600 additional hp and much more efficient 8 bladed props.

I am guessing that the top speed for Orion 21 had to be at least 520 mph; maybe as high as 540. The same speed range as the P-8, but with far better acceleration and loiter capability.

LM never released performance data other than payload to the public that I am aware of. Anyone have an inside scoop?
 
User avatar
kc135topboom
Posts: 11035
Joined: Sun Jan 30, 2005 2:26 am

RE: Orion 21 Top Speed?

Tue Feb 12, 2013 11:25 pm

I don't believe LM ever released the spec on the Orion 21, but it was going to be an updated P-7A, which could do about 350 KIAS, had it been selected.
 
SCAT15F
Topic Author
Posts: 678
Joined: Fri Feb 09, 2007 8:34 am

RE: Orion 21 Top Speed?

Wed Feb 13, 2013 5:34 am

Quoting KC135TopBoom (Reply 1):
it was going to be an updated P-7A

Interesting. As I recall the P-7A used the T407 turboprop of 6000 hp which has now become the GE 38.

I believe the MTOW of the P-7A at 171,000 lbs is the same as Orion 21

Who is online

Users browsing this forum: No registered users and 1 guest

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos