If electric, on demand fans don't work, then why do 99% of newer cars have them. Simple answer, dependable, less expensive and more efficient when it comes to parasitic losses associated with mechanically driven fans.
I'd say at 2400 CFM at rated rpm, the ones I purchased this last spring should theoretically move more than enough air to work just peachy but again, I'll find out first hand. ...and being electrically reversable is a big plus for me as well.
Of course I'm more interested in reverse rotation more than anything else, so I don't have to stop and blow the rad core out many times a day and at 2400 CFM, my air flow over the ac condenser should be more than adequate. When you have numerous heat exchangers proud of the actual radiator, air flow across them is of paramount importance and Kubota deems it necessary to mount those heat exchangers well away from the cooling fan anyway and with no streamlining of that airflow either.
On my M's, the space between the actual rad and the AC condensor and the charge air cooler and the hydraulic oil cooler, they are all stacked one on top of another so thermal efficiency sucks and turbulence reigns supreme and of course the big Group 31 starting battery is smack dab in front of all that as well. Japanese tractor builders should take a cue from JD and mount the starting batteries on the side of the frames, not out front, further blocking airflow.
