WW2 mag has an article bout Hanna Reitch. It mentions she flew even the giant 321 glider. Biggest warplane in the world at the time. It also mention that these were used in Africa & Russia. The cargo capacity was 48.500 pounds. So it would appear that the idea of transporting MK 4 tanks to Africa by air was completely within the realms of reality. Glider used no fuel, so cost effectiveness might be reasonable as well. So much for all the negative posts I got a few monthe back on this subject.