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The military versions had a special use category therefore the higher GW.
As the development of the 337 progressed the GW increased with model production. The straight 337 in 1965 had a GW of 4200, the B model increased to 4400, the C, D, model to 4500 (T models were restricted to 4400 for landing) and the Turbo E model and F, G, H models increased to 4630 for take off but the 4400 landing remained.
The P model G and H had a take off GW of 4700 and a landing GW of 4465.
There are some GW increase STC's available that allowed some models to increase the take off GW to 5400 but were still restricted to the original landing GW. There are also some proprietary STC GW increases that allowed higher take off and landing GW.
I think this is correct to the best of my research but if anyone has some different information please post it here.
Cheers
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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