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Thread: 300R Prop Help
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12-17-2020, 03:05 PM #1Member
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300R Prop Help
So just build a 23' Concept with a 300R with the HD gearcase and a jackplate. Was the first boat they have done with a 300R so they were not sure what the perfect prop would be.
I tried a Rev4 22P and got 6,500 at 64.2mph in salt water and today tried a FS 23P and got 6,500 rpm at 66.1mph in fresh water.
What do you think I should try next? FS 24P? Goal is to break 70mph.
Also has anyone plugged any of the holes on the gearcase? The boat is picking up speed as I jack it up but I am running out of water pressure before I can jack it to the highest setting.
Thanks,
Mike
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12-19-2020, 01:35 PM #2Junior Member
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Slip is very high, a 23 bravo at 6500 would be around 69-72 with good slip numbers. A 300r wont turn 6500 rpm either, so something is wrong altogether.
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12-19-2020, 01:38 PM #3
Numbers don't sound right to me either. You have a T-top?
I have a Checkmate 24. Similar deadrise and weight to the Concept 23. I'm installing a 300R but previously ran a Verado 300 with the standard 1.75 gearcase. The HD gearcase is going to slow you down.
I got 65 mph at 5750 rpm with a ProMax 23p. Works out to 9% slip.Last edited by TraceF3; 12-19-2020 at 01:42 PM.
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Checkmate Pulsare 2100 with a 2017 Merc 250 Pro XS
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12-19-2020, 02:33 PM #4Member
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Actually turning over 6,500. Found a 24FS that I will be trying once it gets here.
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12-19-2020, 02:34 PM #5
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12-19-2020, 02:41 PM #6Member
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No t-top. But hitting the 6,500 is trimming it up a good amount and jacked up a good amount. Have 15 hours on engine so still trying to figure out what the boat likes. With the REV prop it ran fastest with the jack plate all the way down and alot of trim. Just the opposite with the FS, higher I jack it up the more speed I was seeing until I ran out of water pressure.
Have a friend with same 23 Concept with a 300 ProXS with the torquemaster gearcase and he was seeing 68.7mph with a Bravo FS24 at under 6K rpm. Not sure how much the HD gearcase is slowing it down but once I get the FS24 will have a better idea.
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12-19-2020, 02:42 PM #7Member
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12-19-2020, 02:44 PM #8
It's supposed to be in next week. I've already put new steering and controls in. Just need the dealer to hang the motor
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Checkmate Pulsare 2100 with a 2017 Merc 250 Pro XS
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12-19-2020, 02:46 PM #9Member
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12-19-2020, 02:46 PM #10
Yes. I think it will
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Checkmate Pulsare 2100 with a 2017 Merc 250 Pro XS
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12-19-2020, 11:42 PM #115000 RPM
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I have a 2020 Checkmate 2400 closed deck with a 300R and a 24P Bravo FS. It runs 72 mph GPS at 6200 rpm. I have trimmed it much higher and run the same speed at 6450 rpm. It has a hydraulic jack plate. I am not impressed with the motor, but if I was in the boat alone, I think it would easily run 73 mph, and perhaps 74 mph under perfect conditions.
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12-20-2020, 09:04 AM #12Member
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12-20-2020, 09:27 AM #13Supporting Member
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Make sure everyone has had the throttle position indicator set from your installing dealer with a factory G3 (you might be missing up to 10% of full throttle position). Spending the time with the break-in procedure so that the ECU learns individual throttle perimeters and settings in 3 or 4 hundred rpm increments will also give you a better result (it needs to build a curve based your rigs load). The other thing that is recommended from a few guys that know is to get the oil switched over to the high quality verado semi-synthetic oil asap (I never started mine with the factory break-in oil).
I have plugged all but my bottom two side pickups in order to maintain pressure with my HD 5.44 case and still run it somewhat high. The plugs are 1/16th pipe and I ordered them and a matching tap from McMaster-Carr.
Joe
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12-20-2020, 09:28 AM #145000 RPM
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I ran about 5 props. Probably did not have the correct jack plate height for each prop. 26P Bravo 1 ran 70 mph at 5800 rpm, 13.4% slip. A Solas Scorpion 24P at 6000 rpm and 71 mph, 9.8% slip. A BBlades 24P Blaster at 65 mph at 6470 rpm (on the limiter) with 30% slip!! A Hill 5 blade 23P Pleasure at 68 mph, at 6400 rpm and 17% slip. The 24P Bravo FS ran with just under 9% slip at 72 mph. The 26P Bravo accelerated faster than the 24P FS and had less chine walking, but it was too much pitch. The Blaster, Hill 5 Pleasure were both less than 15" diameter and all had excessive slip on my boat (may be different on your boat).
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12-20-2020, 09:42 AM #15Supporting Member
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Everything that I have seen work has been a 15" dia. or close and a 5 blade configuration with exception to the MAD EFI R series (4 blade). On the Tri-toons, they need even more dia. because they require all of the blade surface to be somewhat efficient so we are limited to the 3 blade 16" dia. Enertia Eco. Sounds like you need to send the 26 Bravo in to be worked and will be close (call Mike E. at FJ propeller and be very specific with what its doing-he will amaze you with results if he is given the correct information initially). (I would also recommend calling Todd D. from Mad EFI and see if he has anything close to what you are looking for. We have run his four blade design on several boats and they have been the top producer (most were light boats).
As always, engine height is the key factor to reduce drag, pull top numbers, and get the best handling.
Joe
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