@Lake X Kid ..Ugly or not..:)Quote:
Originally Posted by lars strom
Pretty interesting member/person making comments about the OMC racing rotary at my FaceBook page.
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@Lake X Kid ..Ugly or not..:)Quote:
Originally Posted by lars strom
Pretty interesting member/person making comments about the OMC racing rotary at my FaceBook page.
#44 Dario Eugenio Grassini UIM Formula 3/OE. Molinari/Evinrude CC
Stockholm GP 1984.
https://www.screamandfly.com/attachm...6&d=1695071089
1979 Evinrude advertising.
https://www.screamandfly.com/attachm...0&d=1695072031
CCC and the Rotary.
https://www.screamandfly.com/attachm...1&d=1695075151
Nope..I still don't know who she is..!!..:)Quote:
Originally Posted by lars strom
The picture with Ralph Evinrude shows the actual props used. I believe this picture is from Miami into. Switching prop direction and size was a trick used confuse Merc.Quote:
Originally Posted by lars strom
The view merc. T-3 drivers saw most of the time.Quote:
Originally Posted by lars strom
Mike Griffith is the other Engineer in the photo. He was instrumental in the design and development of the rotary race engine.Quote:
Originally Posted by WaterZebra
RJ - It's safe to assume that the "bucket" was a single piece aluminum casting (gearcase, swival pin, steering bars and engine and top cowl attachment, etc). At rest, where did the waterline end up with the boat sitting in the water? Did submerged back pressure bother the wankel? Was the exhaust "top stacked" to deal with the waterline?Quote:
Originally Posted by Rotary John
It's a national tragedy that more still photos and videos were not taken at the time!! I also believe that the break thru technology involved was poorly managed by OMC. Regardless of race committee pit rules, the boats and engines should have been locked away in garages with security personnel just like Area 51.
Here..Quote:
Originally Posted by WaterZebra
https://www.screamandfly.com/attachm...5&d=1695136186
https://www.screamandfly.com/attachm...3&d=1695135468
From the 1974 Johnson Sales brochure and OMC is promoting the Stinger GP V4 race engine and the Rotary.
https://www.screamandfly.com/attachm...4&d=1695135812
You are correct; the bucket was a sand cast aluminum part that the lower end of the swivel bracket, gearcase, steering arms, engine and shroud attached too. The upper end of the swivel bracket attached to the top hsg. of the bottom engine. The exhaust manifold had individual tunes pipes that ended at the bucket/shroud split line that dumped into a collector. there was also some trick stuff in the exhaust that I never have told about. The initial engines had a pulse drive fuel pump that was to pump any water that got into the bottom of the bucket. It was dropped later on as water was never a problem in the bucket unless the entire engine went under. Lars post a couple of pictures showing the water line at rest. Notice the 2 brass pipes extending out of the back at the split line? They were exhaust relief pipes tapped into the collector. We always used them but I'm not sure they were really needed as the rotary in a 4-cycle with a positive exhaust cycle. I'll see if I can find a couple more pictures. I know Strang always had his camera around his neck and was always at the races, but I don't know what has happened to them. Barb may still have them, or they may have been thrown away. Remember this was 50 yrs. ago. OMC also knew Merc. was playing with rotaries also (Ben Shafer). Therefor secrecy was of the upmost with this project. Many if not most of the engine details were never revealed until BRP bought OMC and had no interest in the rotary, and I wrote " the real truth". I even got permission from BRP before I published it.Quote:
Originally Posted by WaterZebra
Attachment 524539Attachment 524540Attachment 524539Attachment 524541Attachment 524537Attachment 524538Attachment 524536
Here's a couple showing the basic engine in more detail. The blue item in the cut away bucket is the exhaust collector that the manifold pipes dumped into. The last is my favorite. Paris 1974. I don't know if that's Jimbo or Barry passing the Merc. T-3 for the umpteenth time.
That gal has more silicon than Dow Chemical.Quote:
Originally Posted by lars strom
Maybe I missed it but...(last couple posts were a bit distracting :D) Why did OMC decide to not go to production with the rotary? The block issues?
-BL