SD40-2 Fans

[High Hood]

Hello! Does anyone know what year exactly Dash 2s started using Q Fans?  Also how many blades did the standard fans and Q fans have on the radiator and dynamic brake fans?

[Ed Kapuscinski]

According to this source, which itself is uncited, 1980 was the year of the change.
http://www.trainorders.com/discussion/read.php?3,2119687
http://www.railroad.net/forums/viewtopic.php?f=6&t=48197&start=15

The wikipedia article, however, says 79 for the GP40-2s (at least):
http://en.wikipedia.org/wiki/EMD_GP40-2#Phases

[jpwisc]

I've shot photos of the tops of several SD40-2s. Wether Q-Fan or not, the dynamics are typically 10 blade and the radiators are typically 8 blade. I say typically because I have seen repair or replacement jobs where the shops didn't have the one they needed so they used what was on hand. I have seen 10 blades on the radiators and 8 blades on the dynamics. This is not normal, but it does happen. I have also seen 9 blade fans being used...



I've got some Q Fan pics in my archive, I'll pull them out when I get home.