The -23 was not bad and neither was the Citation but then the Citation was flying about 90kts slower than the -23. Our Vmo was 358 if I remember correctly. Later Lears were limited to 306. Story was the -23 did not do the bird proof testing and later Lears did. Problem was that the birds started coming apart at 306 and so the limit was not on the Lear windshield but on the Max V for birds. Don't know if it is true or not but makes for a good story.

Both airplanes were noisy when you turned on the windshield bleed.

THE noisiest cockpit was the Boeing cockpit which is the same on the 707/727/737. I always used ear plugs above 250kts and on our 727s you could do over 400 indicated in the A mode but you were using hand signals to communicate or yelling very loudly.

I think the quietest cockpit I was in was the MD-80s. Lots of white noise but very quiet compared to the earlier Boeings.

All cockpits are much better with the ANR headsets.

Oh, and I just remembered.. THE NOISIEST cockpit I ever was in was a C-123K. 2 big recips right by the cockpit AND two jet engines. How any of those guys are not without hearing aids now is a miracle.