[Yaesu] Duty cycle question

[Bill Turner]

Is Yaesu being overly cautious with their 50% duty cycle rating for RTTY?

I have a Mark V FT-1000MP Field which I use for RTTY contesting. 
Following the instructions in the manual to feel the temperature of 
the exhaust air and the cabinet, I've been gradually working the 
power output up to 100 watts. Even at that level, the air and the 
cabinet are barely warm to the touch.

This tells me it would have no trouble running at 100 watts during a 
contest all day long.

Comments?

73, Bill W6WRT