[FREE DOWNLOAD] NO 5. Sound and Heat Barrier. 70 years ago the a press release stating that Lts. Harold E. Comstock and Roger Dyar had exceeded the speed of sound (590 mph) during test dives in the P-47 Thunderbolt.(1942).

Description

70 years ago the a press release stating that Lts. Harold E.Comstock and Roger Dyar had exceeded the speed of sound (590 mph) during test dives in the P-47 Thunderbolt.(1942). It is also reported that once the speed of sound is exceeded, this condition disappears and normal control is restored, this is now not a problem.

Each selected pair has been twined to give a pleasing picture to be displayed with an A4 or A3 printed size, large enough to read the small Eagle Centrespread text.