Lear 60 vs. 45

[Throttlebender]

Hey Lead Sled,
May be a silly question, but when you said hot wings degrade performance was that because of bleed air usage or some other reason?

 

[LJ45]

not lead..but..

It uses lots of bleed air from the engines. Thus, less thrust or less power.

 

[Lead Sled]

Hey Lead Sled,
May be a silly question, but when you said hot wings degrade performance was that because of bleed air usage or some other reason?

Throttlebender...
There's no such thing as a silly question, just silly answers. Remember, you can't get something for nuttin. If you take energy (bleed air) from the core of the engine to heat the wings, stab, and engine inlets it won't be there to "blow" out the back of the engine and provide thrust. As I mentioned in a previous post, heated leading edges are considered anti-icing (as opposed to de-icing) devices and you must turn on the heat whenever you are in conditions conducive to the formation of ice. This is compared to de-icing devices like the Astra's boots which are cycled to remove ice that has formed on the wing's leading edges. The other typically encounted option out there is TKS used by Hawkers, some Citations, and some piston powered aircraft. TKS systems can be used either as anti-icing or de-icing.

'Sled

 

[Throttlebender]

Thanks. I assumed as much, but didn't really think it would rob enough bleed air to cause noticable performance loss. Now I know

 

[banned username 2]

Thanks. I assumed as much, but didn't really think it would rob enough bleed air to cause noticable performance loss. Now I know

In the Falcon 20 with the CF700-2D2 engine we really couldn't climb above FL180 with the Anti-Ice on if we were heavy... (of course even with it off it was a chore to climb much above that anyhow!)

There is a noticable difference in performance in most every jet when you turn on the anti-ice...

 

[flyinglow]

Question for LJ45 drivers.

Is it normal to configure for landing at 3,000 AFL, on G/S.

 

[LJ45]

?

Question for LJ45 drivers.

Is it normal to configure for landing at 3,000 AFL, on G/S.

Maybe, Usually VFR about 5 miles out or so (outer marker area)
Schools teach GS capture flaps 20 Gear down.

The airplane doesn't pick up a lot of drag until full flaps (flaps 40)

 

[Sphrynxlla]

at 5 mi out your only 1500 ft agl... i dont think fully config. at 3000 ft is normal even per flight safety

 

[Sphrynxlla]

can any one tell me the Takeoff field length for the Lear 60... Max TOW, ISA, SL no anti ice or rain or anything.

 

[ultrarunner]

As reported by UltraNav:

Max TOGW: 23500
TOFL: 5619
Net 2nd Seg gradient: 4.9%
V1 132
VR 140
V2 147

T.O. N1 93.7

No Wind
No Ice
Anit Skid On
Autospoilers Armed
FLAPS 20

For Flaps 8, the TOFL increases to 6065
2nd segment net climb gradient increses to 6.1%
Speeds as follows:
V1 136
VR 145
V2 153

 

[Cpt Splash]

The 45 is a great airplane. The 60 is one of those airplanes that has too much power, the gear and brakes are from the 31 making it prone to brake replacement. I have had the 45 up to 490 myself and you will get .80 out of it. I know alot of owners of the sixty love the 45 because of the increased seats and the large baggage compartment. On a side note the 60 has the worst lav system known to man. Some brilliant engineer thought that a turd would never have a diameter bigger then a quater. Genius!


Go with the 45

 

[banned username 2]

one of those airplanes that has too much power

No such thing...

 

[Sphrynxlla]

The 45 is a great airplane. The 60 is one of those airplanes that has too much power, the gear and brakes are from the 31 making it prone to brake replacement.!


Go with the 45

NO choice! im on the 60 now.

 

[Sphrynxlla]

As reported by UltraNav:



No Wind
No Ice
Anit Skid On
Autospoilers Armed
FLAPS 20

For Flaps 8, the TOFL increases to 6065
2nd segment net climb gradient increses to 6.1%
Speeds as follows:
V1 136
VR 145
V2 153

That is a TON of runway your eating up....way more than the 35. Guess the extra 5000 lbs will do it.

 

[Lead Sled]

The 60 is one of those airplanes that has too much power...

Wha-choo-takin-bout Willis? Airplanes are just like cars, boats, motorcycles, snowmobiles, etc. You can never have too much power.

'Sled