Also i got 2 videos of a Hunter I-40-06-SS-ON Rotor running off a garden hose with the 2nd to smallest range nozzle and the smallest spreader nozzle. it runs pretty decent on both sources. i guess you could say that it took the place of these 51's.
yep 51's for sure. They have that slotted combo drive/spreader nozzle up front and that huge rear drive nozzle. I have a 51 myself, but i busted the chassis trying to get it off a pipe.