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A Question About Lear Jets  
User currently offlineKlm744 From United States of America, joined Jun 2001, 112 posts, RR: 0
Posted (14 years 7 months 1 week 2 days 14 hours ago) and read 1407 times:

I heard many times and again in the loudest jet thread that lear jets are very loud. I have heard one only once and I agree that they are extrememly loud. My question is are the loud lear jets only the older models, or are all lear jets loud, but just not as common these days.

6 replies: All unread, jump to last
User currently offlineOO-AOG From Switzerland, joined Dec 2000, 1426 posts, RR: 4
Reply 1, posted (14 years 7 months 1 week 2 days 14 hours ago) and read 1386 times:

We operate a couple of these rockets, all are Stage III and I've never really noticed that they are that noisy.
At least you don't notice it as a pax.


Falcon....like a limo but with wings
User currently offlineNotar520AC From United States of America, joined Jul 2001, 1606 posts, RR: 3
Reply 2, posted (14 years 7 months 1 week 2 days 14 hours ago) and read 1380 times:

Yeah, all of em I've seen sound like a coyote in a garbage can with a stereo blasting inside. Really noisy!!!

BMW - The Ultimate Driving Machine
User currently offlineDesertJets From United States of America, joined Feb 2000, 7897 posts, RR: 14
Reply 3, posted (14 years 7 months 1 week 2 days 14 hours ago) and read 1373 times:

All older 20 series LearJets use GE turbojet engines... certainly quite loud. The newer 30 series, the 55 use Garrett TFE-731s turbofans and the 45 and 60 use a new generation Pratt turbofan.

Stop drop and roll will not save you in hell. --- seen on a church marque in rural Virginia
User currently offlineTwotterwrench From , joined Dec 1969, posts, RR:
Reply 4, posted (14 years 7 months 1 week 2 days 11 hours ago) and read 1356 times:

All the 20 series lears had CJ's on them, which is a straight turbo jet and very loud. You can still hear a 25 when they are 20 miles down range. Also, advancing the thrust levers = pushing you back in your seat. I love those old lears. The newer lears have mostly 731's which is a bypass fan and therefore much quieter and much more fuel efficient. The downside is they don't have as much "bang for your buck." They feel underpowered and sluggish by comparison and don't have the climb performance the 25 did.

User currently offlineJetguy From , joined Dec 1969, posts, RR:
Reply 5, posted (14 years 7 months 1 week 2 days 6 hours ago) and read 1341 times:

From my perspective (3,000 hrs) of Lear time...
20 and 30 series Lears have the best technology that money could buy in 1958. The 20 series have the NOISEY turbojets and the 30s have the much quieter turbofans. That accounts for the differences in their external noise levels. The internal noise level is dependent upon cabin soundproofing and the type of windshield heat they have. However, they all (except for the 31s and a few of the late 35s) have bleedair windshield heat which is EXTREMELY NOISEY when it is used (nearly every flight starting about 45 minutes prior to descent - to keep the windshield from fogging after the airframe is cold soaked.) I've been in a few 35 freighters that were absolutely numbing when it came to noise levels, but the corporate 35s I've flown were for the most part very nice from a noise perspective. (From a comfort point of view, the biggest problem with them was heat stratification in the cabin - at night when it was cold-soaked the cabin/cockpit floor got extremely cold and your feet would go numb. Some operators installed electric heaters in the floor to combat the problem.) I've got to disagree a little bit with what Twotterwrench said about the sluggishness of the 30 series aircraft. It is true that they don't have the get up and go of the 20 series, but they are usually flown at weights up to 3000 pounds more. When flown at equal weights the differences are minimized. However, the 20s still have the advantage in the climb. That being said, I'll take a 30 over a 20 any day - I like not having to fly around with a "fuel emergency" in progress.  Big grin

User currently offlineL-188 From United States of America, joined Jul 1999, 30404 posts, RR: 57
Reply 6, posted (14 years 7 months 1 week 2 days 6 hours ago) and read 1329 times:

It is amazing. A 25 can out whine a 747 on the role easily. You really notice it when you crawl under the lefthand motor to pull the GPU plug when it is running.

Lot of noise in that motor if you just let it go and don't hold it back..

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