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I'm having so much fun with that site I could just spit. Yours, by the way, is very good and have visited it despite fears of contracting ganGREEN. I'm 8 miles from getting to the point where the site is on par with yours. Heck, it's like restoration work--half the fun is just getting there. I didn't click in my brain that one of our Clubbers had a genuine Baker fan until I saw pictures that were posted here a couple of weeks ago. My know-all-gossip brother confirmed that it was indeed a Baker Fan. One of the pictures posted here is a dead ringer for the one we use, and I will go back to the archives and duly report to you which picture it is. I never got around to measuring the dimensions of the fan. I was going to do that after I had come up with an equation based on how much the fan needs in HP to turn at a certain RPM BASED ON THE FAN VITAL STATISTICS. Alas, no one could tell me how to figure performance in that manner. From memory, the 4 paddles are 24" square, the major OD is 72", and the minor OD is 24". There are two belt pulleys of different diameter; one attached to one end of the fan shaft, and the other on the opposite end. The test tractors (victims) perform better when belted to the larger pulley as this allows the tractors to develop more RPM and thus run in the range where they tend to develop more HP. Our fan is on a skid, and we stake down the skid frame to the ground as well as stationing the fan near an immovable object such as a tree where we can strap the fan. This allows for good belt tensioning. In the course of getting my site together, my sister-in-law has been sending me pictures. I would surely think she has at least one of the fan because whenever it's around a Club event, the fan gets a lot of activity. As you know, it's a guy thing. If you ever get a fan built or bought, be prepared for some possible disappointment when you strap to it. Many of our Clubbers have JDs, and we have found that they do not perform on the fan as well as other tractors especially the larger JDs like 720s and 820s. While very stout in the engine department, their power impulses are so strong and spaced farther apart than a 4 cyl tractor. Under a very heavy fan load, the JDs get to chirping on the belt degrading performance and therefore will not develop as high a fan RPM as a comparable HP 4 cyl tractor. Perhaps the remedy for this is a very wide belt and pulley on the fan, but you still are locked in to the tractor's pulley face width. Maybe a different belt material than we use is the answer.
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