Unlimited jd

interesting fact, every internal combustion engine crosses hp and torque at 5250

RBeyer

well i guess looking at the simply the graph and not the numbers 50rpm is pretty close. That is an interesting fact though.

hotjava66

Have you tried running 3 blade props? I know everyone turns their nose up at them these days but as low as the drives are on most 28's they do work better imho. Slip #'s on my 28 were crazy low with 3 blades and they were significantly faster. Yes, you can't hole shot like a drag racer with them but they also had less tendency to porpoise at cruise. Would be worth at least testing a set of old school 31 Mirage if you can put hands on them.

RBeyer

They are hard to find and don't know if a 31 would be big enough and I boat on short lakes so I don't think I have enough room to use run them out. These 32s seem to be a great baseline and should work with a little tweaking. I need 100 to 200 RPM to be where they want me. I understand just removing the diffuser ring will give you 150. It really needs -2" shorties just cant make that work until maybe over the winter. Hard to ***** about low to mid 90's

hotjava66

Yeah thats a nice number. Would keep eyes open for a set of 31's if you can buy right, was told they are actually more like 32's or 33's might be the ticket. I thought hard about shorties, I don't know if these hulls like them after asking around, same with extension boxes. With the rocker built into these hulls you need enough leverage to carry the bow or they will want to hop.

RBeyer

The 32s seem to have gotten rid of the porpoise at low speeds even with trim up. it is carrying the stern well. If it does start to bounce a quick bump of the throttles or a trim adjustment take it right away. Seems to be coming together nicely. I think the shorties would be nice for taking away a bit of bow lift. I would love to try them.

SABER28

hotjava66, do youknow you drive height? or at least the distance from the rubrail to the top of the transom assembly? curious as mine has the hatch raised two inches so im wondering if my height is raised. might have to call doug.

is anyone interested in a saber rally? the old ones were fun.

hotjava66

I dont have the boat anymore but I can tell you my hatch was not raised and prop shift centerline was about 6.5" below the bottom at drive location using a long straight edge

FunHome

Interesting, I have a set of 27p 3 blade Mirage props. I've heard of the 29p Mirage 3 blades, but I did not know they made 31p 3 blade Mirage props.

RBeyer

32 4 Blades with a little tweak are the answer, Thanks all!