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07-19-2018, 08:23 AM #2565000 RPM
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07-19-2018, 09:08 AM #2575000 RPM
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Awesome results. I had a good feeling it would be faster than the 300xs. The need for 5 and 6 blade props makes sense. Hopefully we see Mercury racing come out with more props now that this big diameter sportmaster will be used on all the models. Sounds like the motor is a winner just from the first couple of runs. Keep us posted
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07-19-2018, 09:11 AM #258
Multi Blade props are where it's at. Unfortunately what will probably work well will not cheap. Dave Dewald has been working on a new line of propellers as well as what he does with the X Cat boats overseas. I run Dewald 5 Blades on my Skater and for what it worth to date at least on Jim's boat my 32 Dewalds were faster and more efficient than the 32" over the club big money mercury cleavers. The mercs provided better cruise speed and got on plane faster but in the end were 3-4mph slower. As far the comments on lower water pick ups touching that motor or gearcase will void any warranty you have. I have researched using my hull pick ups on the 400r's with the same lower unit and it will not be easy like the old 3L cases. Just like the larger OB cats it will take some time for the prop guys to figure out what the single engine boats need. Now all you guys need to go out and order some 300r's!
Double Rigged
308 Skater w/400r’s
Over-Kill
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07-19-2018, 10:17 AM #259
Is this engine dry sump?
Hydrostream dreamin
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07-19-2018, 12:46 PM #260
Randy thanks for taking the time to do this comparison!!!
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07-19-2018, 02:45 PM #261
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07-19-2018, 03:16 PM #262Screaming And Flying!
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Everything being said here would indicate the 300R having more actual hp than any other "300" on the market. If a 300XS has let's say 320 hp. By comparison, this motor is pushing 345+hp. Nothing wrong with that. It's great actually.
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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07-19-2018, 03:33 PM #2636000 RPM
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I think the dbr dyno of the 300xs was showing more like 310. My math says the 300r is 322-329.
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07-19-2018, 03:50 PM #2645000 RPM
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Double Rigged liked this post
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07-19-2018, 05:52 PM #265Team Member
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Engineer Mike - did you assume HP proportional to velocity squared? In this situation I would want to correct for the increased drag of the bigger case. But I don't know how.
fast outboards are not dead
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07-19-2018, 06:32 PM #266Screaming And Flying!
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Looks like it is speculated that could end up being 8-10 mph faster than a 300XS. How many more hp to go that much faster when put into the gizmo and calculated?
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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07-19-2018, 07:35 PM #267
That motor will not be 8-10 mph faster than a 300xs.
The 400r is only about 10-12 mph faster.
300xs is 305hp stock. Not trying to knock the engine, it is a very nice motor. But it is still a 300 not a 350 or 400.
Double Rigged
308 Skater w/400r’s
Over-Kill
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07-19-2018, 08:04 PM #268Screaming And Flying!
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I don't think it will be more than a couple mph faster than a 300XS when Wildman and support team are all done with it. That case is big and I bet the skeg itself is bigger than a 300XS. Not down on the 300R, it will be interesting to see.
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07-19-2018, 08:46 PM #2696000 RPM
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Yes, velocity squared. Technically, it should be cubed but in boats the wetted area reduces as speed increases so it's not as steep of increase as it would be for a car (or submarine).
I didn't account for the larger gearcase. However, I THINK the water pickup on the hd sportmaster is lower and further back, allowing higher running height that 3.0 sm.
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07-19-2018, 08:49 PM #270Supporting Member
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