Cruise Mach for various Business Jets
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Location: Hampshire
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Cruise Mach for various Business Jets
All,
I was wondering if you could provide me with the cruise mach number and Mmo for the various business jet types that you fly? I understand that some of them are quite a lot faster than typical commercial jets and I want to get an idea of the speed difference. It is for a project I am working on, to correlate high cruise speed with specific design features (e.g. wing sweep, thickness to chord ratio, aerofoil section, etc).
Grateful for any help you can provide.
Regards,
WF
I was wondering if you could provide me with the cruise mach number and Mmo for the various business jet types that you fly? I understand that some of them are quite a lot faster than typical commercial jets and I want to get an idea of the speed difference. It is for a project I am working on, to correlate high cruise speed with specific design features (e.g. wing sweep, thickness to chord ratio, aerofoil section, etc).
Grateful for any help you can provide.
Regards,
WF
Challenger 300
Cruise 0.82 (unless you are trying to eek out 7 hours across the atlantic with a jet stream in the face - in which case it was 0.80 today)
MMO 0.83
MMO 0.83
Join Date: Mar 2004
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C680 MMO .8 max speed varies a lot with altitude and weight. Usually doing HSC at .74 to .8
The ones much faster are few, the G650 and Citation 10/X spring to mind.
The ones much faster are few, the G650 and Citation 10/X spring to mind.
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Challenger 604/605 & Gulfstream G200
CL604/605
Mmo 0.85
Normal cruise 0.80 (large decrease in fuel efficiency above that speed)
Most efficient speed 0.77-0.78
LRC 0.74
G200
Mmo 0.85
Normal cruise 0.81-0.82
LRC 0.74-0.75
Mmo 0.85
Normal cruise 0.80 (large decrease in fuel efficiency above that speed)
Most efficient speed 0.77-0.78
LRC 0.74
G200
Mmo 0.85
Normal cruise 0.81-0.82
LRC 0.74-0.75
Cruise speed...
For the Global 5000 and XRS the speeds are as follows...
Keep in mind that maximum TAS and Mach vary with altitude/temperature and the higher you go the lower the MMO will be.
VMO (SL - 8000') = 300 KIAS
VMO (8000' - 30,267') = 340 KIAS
MMO (30,267' - 35,000') = 0.89M
MMO (41,400') = 0.88M
MMO (47,000') = 0.858M
MMO (51,000') = 0.842M
Normal cruise speed is 0.85M and we use for long range cruise speed when heavy 0.82M.
If you really want to go fast and fly as close to the VMO/MMO you would fly the Global between 30,000' and 41,000'.
Keep in mind that maximum TAS and Mach vary with altitude/temperature and the higher you go the lower the MMO will be.
VMO (SL - 8000') = 300 KIAS
VMO (8000' - 30,267') = 340 KIAS
MMO (30,267' - 35,000') = 0.89M
MMO (41,400') = 0.88M
MMO (47,000') = 0.858M
MMO (51,000') = 0.842M
Normal cruise speed is 0.85M and we use for long range cruise speed when heavy 0.82M.
If you really want to go fast and fly as close to the VMO/MMO you would fly the Global between 30,000' and 41,000'.
VMO (SL - 8000') = 300 KIAS
VMO (8000' - 30,267') = 340 KIAS
VMO (8000' - 30,267') = 340 KIAS
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That change is also at 8000ft (something to do with windshield certification) - I think every Citation has it....
For the Sovereign that is 270/305
For the Sovereign that is 270/305
In reply to trim stab...
Quote...
"Is that a step-change at 8000'? Must be a right PITA in the descent! The CJ2 has a similar step-change at about 6000' IIRC and it was always a challenge to remember to slow down enough to stop the overspeed klaxon sounding."
I don't see how it is a problem seeing that you have to be at 250 kts below 10,000' in most if not all airspaces in the world.
"Is that a step-change at 8000'? Must be a right PITA in the descent! The CJ2 has a similar step-change at about 6000' IIRC and it was always a challenge to remember to slow down enough to stop the overspeed klaxon sounding."
I don't see how it is a problem seeing that you have to be at 250 kts below 10,000' in most if not all airspaces in the world.
I don't see how it is a problem seeing that you have to be at 250 kts below 10,000' in most if not all airspaces in the world.
Quite happily get 270kts in the CJ2+ - as said, you get to 8000ft, and then VMO drops to around 263kts IAS, and if you forget that (as previously mentioned), you do get a nice alarm in your earholes hehe - you only forget once or twice after that ;-)
Oh, CJ2+ MMO I think is M0.737, usually with a good ISA and FL450 Cruise, you can expect say M0.71...
F/o
In reply to First.officer...
Quote...
"Not in the London TMA if they give you free speed...."
I did say "most" airspaces in the world... Too bad Canada changed their speed restrictions to align themselves with "the rest of the world" some years back.
It used to be that on departure in Canada if you were cleared above 10,000' one could accelerate to any speed above 250 knots while in the climb. )-:
"Not in the London TMA if they give you free speed...."
I did say "most" airspaces in the world... Too bad Canada changed their speed restrictions to align themselves with "the rest of the world" some years back.
It used to be that on departure in Canada if you were cleared above 10,000' one could accelerate to any speed above 250 knots while in the climb. )-:
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@AstraSPx
Are you sure about your cruise speed and MMO?
I spent 13 years in the IAI 1125 ASTRA and it was a 0.78 cruiser with 0.835 MMO. Is the SPx different?
Also, regarding GLEX speeds...
A quiet flight deck to be sure but anything above 320 KIAS gets unbearably loud up front. Don't know why one would want to fly faster. You are only in this realm in the teens during descent anyway.
Are you sure about your cruise speed and MMO?
I spent 13 years in the IAI 1125 ASTRA and it was a 0.78 cruiser with 0.835 MMO. Is the SPx different?
Also, regarding GLEX speeds...
A quiet flight deck to be sure but anything above 320 KIAS gets unbearably loud up front. Don't know why one would want to fly faster. You are only in this realm in the teens during descent anyway.