I have operated from the radio position in B-26 Gunner/RO, C-47, C54, B-29, B-50 and flown B-26, B-25, PV-2, HU-16 and others. For noise the PV-2 and HU-16 win hands down for internal noise. In the PV-2 you can holler at the top of your voice across to the co-pilot a distance of 3 feet max. and cannot be heard. On intercom it is a cake walk in both. Hank KN6DI