quote="The Inspector"]The ALLISON W-3420, two ALLISONS side by side with two cranksha----aw! just think of it as the American DB-610 (and darned near as successful too) Also tried on the XB-39 , the XP-75, and post war, Edgar Kaiser ran them in one of his Unlimited hydros named 'SCOOTER TOO' ( U-10) the SCOOTER spent half its career on a tow rope or filling up with race course it was on-
Olympia Air Museum has one, Curtiss, can ya show us a photo?

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I used to have one of those W-3420s, a while back. had to get rid of it because we could not get our trucks & aircraft trailers in the double wide doors-as it took up so much room. We had 175 (mostly) pre-WWII aero engines; 48 were WWI and earlier, and 19 were the only ones Known of their type. Now most are in replicas, restorations or museums. We got the 3420 from one of the guys who were planning to use it in the tractor pull events. But more importantly, from the same guy we got a couple of New Allisons for the P-39s, complete with the long shafts, & gearboxes etc.