Prop change needed after weight change

[Senko_Kid]

Guys,
I have an 04 stratus 201 with blades, 12” plate and I installed a ghost and replaced my 2 31 trolling batteries with a pair of lithium pro 36 volt batteries. I run a bone stock 25 fury no plugs and it has been easy to drive and saw as high as 76 with 2 guys and could run it to 5950 or so. Since the change I’m struggling to get past 5600 with 2 guys different plate heights and trimming a ton just to get that at 72.5. Good boat guy and fellow member is recommending a 24 tempest just seeing if there are any recommendations from others. Water line on poles seem to be 2-3 inches lower than before batteries. Problem seems to be I now need more bow lift and less stern lift. Thanks for help.

[1BADAIR]

Tempest would have more bow lift. The rpm loss is probably from less bow lift so I’m not sure I would go down in pitch

[Capt James]

Tempest + or a Bravo FS/XS

[Senko_Kid]

I have an sl4 bravo knockoff with cup and pvs holes that was a great Holeshot but topped out quick at 72 before changes. I’m gonna see if it gives me more speed now that stern lift isn’t as required. I am also going to try a 25 tempest if I find one. Thanks guys.

[6BOOMER]

I'm struggling also. You'll need to get the prop worked. I had a 25Bravo 1xs and did not give the bow lift actually gave more stern lift. 25 Tempest Plus worked helped however still not the speed. Best bow lift has been from a 25 trophy. Looking for a trophy plus to see if that works better.

[Senko_Kid]

Haha boomer I tried to buy your tempest. I ran a 23 tempest today just to see how the characteristics were. I was able to run up and clean but not is much lift as I hoped all while trying to stay below 6k. Isn’t a trophy plus a pretty small diameter prop? I ran one on my 18’ nitro with a 150. Also I’m now unable to spin my sl4 now either past 5500.

[lpugh]

Lower the motor due to the weight loss in back

[6BOOMER]

Haha boomer I tried to buy your tempest. I ran a 23 tempest today just to see how the characteristics were. I was able to run up and clean but not is much lift as I hoped all while trying to stay below 6k. Isn’t a trophy plus a pretty small diameter prop? I ran one on my 18’ nitro with a 150. Also I’m now unable to spin my sl4 now either past 5500.

That tempest sold quickly. Have another i had worked. Like the Croxton 24 4blade much better than the tempest and bravo1.

[1BADAIR]

What did they do to the other tempest. Might be interested. Called a couple days ago about a 3 or 4 blade razor but haven’t hear anything

[6BOOMER]

Adjusted rake some, added more cup. Gets a little loose one it grabs. It is a back up along with a trophy. The Razor has been the best so far.

[78Staff]

Running into similar... loss of weight in stern due to lithiums plus added weight on bow due to multiple MFU's, etc and carrying a tackle store up front. :). SHO 225, T1 25 would run 6150 but I've had two of them crack on me in the past year (one worked by Mark ), so have been running a T2 25 which was to be my backup prop - oddly it runs a bit lower on RPM but has been the fastest of the three props at 69mph. The T1's topped out at 66-67 typically.

But being fed up with T series and wanting to be able to have a backup, I've been testing some Merc hub props, first a Solas Scopion since it is reported to have great bow lift - however even dropping two pitches as recommended to a 23p I can only run it up to about 5750 and 65mph... But it is a strong prop for sure, midrange is excellent, it will be running 60 at 5k rpm but struggles to get much faster topping out at 64 at 5750. Perhaps I should have dropped down another pitch, not sure.

Just installed a Tempest I picked up here last week - a 25P to try it out, it has vents so not sure how the SHO will react, it's my understanding once up and going vents don't matter, but they effect/can improve holeshot on 2S motors, but aren't typically required on 4S. But I don't have any vent plugs, so will try it this weekend with open vents I guess.

As mentioned above, due to lightness in the stern I have been finding the best performance lower on the JP range, typically 1 - 1.5 on the Bobs scale. So I moved my motor down one set of holes so I could open up a bit more range at the bottom also.

[lpugh]

gona need at least one plug

[78Staff]

.

[6BOOMER]

No plug may try a cavitation ring.

[Senko_Kid]

Leon,
I did that and it didn't help. The PtP was 3.25 and I went down and up it didn't change much. RPM's I could get another 150-200 but wasn't changing attitude of the boat.