This variant was characterized by their enclosed canopy and, even if it's not that visible, they had a metal light alloy propeller manufactured by Letov. Those and various other refinements made the IV series to reach top speeds of over 200mph, placing it on par with the best biplane fighters of those years.
Another small changement was the replacement of the tail skid with a tail wheel and, after having made some field testing, the main wheel spats were often removed after discovering that they clogged very easily with mud.
Sources:
1. https://en.wikipedia.org/wiki/Avia_B-534
2. Salamander Books - The Complete Book Fighters
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