This is just an inquiry... After starting the engines and they are at idle I will hear this tap sound every so often. I am just curious what old antique sound is the B-25 making other than the grumbling of the radial engines? I don't mind the sound at all it is all wonderful. I am just trying to understand the old girl and what she is trying to tell me.....Thank you for the reply.

What you are most likly hearing is the engine occasionaly miss firing. It sounds very real for your typical "round" engine.. Mike B.

That distinctive popping noise is caused, or at least amplified, by the B-25's short exhaust stacks. You only hear it at idle. From inside the aircraft, standing right behind the pilots where I did to make these recordings, it is really loud. But then, everything about those engines is LOUD! BT is a very rare bird in that it has the original short stacks all the way around, rather than the post-war collector ring which took the top stacks and dumped them into one big pipe outboard on the nacelles. That was an effort to tame the decibels, and the lack of them makes BT much louder than almost all other B-25's flying today. Bill Rambow MAAM-SIM - Rambow, Visser, Banting, Young, Womack, and Hamblyhttp://www.fssupport.com/maam_sim/maamsim_logo.gif

Very cool. I thought BT was a one of a kind. Thank you for the info.