1997 31 Thunder Seems like it should be a little faster
#11
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My 96 Kevlar is probably quite a bit lighter than yours(due to the Kevlar and plain jane cuddy)
but I never run any tab with mine. I keep them as negative as they will go. How I decided on trim was watching gps speeds and the porpoise. My boat is fastest with no tab and it slightly bouncing. If you use any tab at all it's slows it down more than just trimming back down alittle. Mine with the 502 mags and m1 procharger would run over 80 with bravo 28's on it.
but I never run any tab with mine. I keep them as negative as they will go. How I decided on trim was watching gps speeds and the porpoise. My boat is fastest with no tab and it slightly bouncing. If you use any tab at all it's slows it down more than just trimming back down alittle. Mine with the 502 mags and m1 procharger would run over 80 with bravo 28's on it.
#12
Had a 91 scarab 31 with 502's at about 480hp at the crank. I ran both 27p mirage+ 3 blades then lab finished bravo 28p 4 blades. I saw 5200 rpm with the 3 blades and 5100 rpm with the labbed 4 blades and the top speed was about the same but all around the 4 blades handled way better. I would trim up until the bow would just start to bounce and found this point to return the best gps speeds. The boat ran 74 with 4 guys and half tank of gas and with just me and the wife with a quarter tank of gas and light on gear it would run 77 - 78. Boat was very weight sensitive.
#14
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Join Date: Sep 2014
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Pulling the blowers for a fresh up.Think my K planes were slowing me down being dropped down.Need to get a few more hours of driving since I've actually only driven 3-4 hours.I see no reason why I shouldn't be very close to 80mph with the 525sc package with 230 hours.Big diff from the 18' 165hp searay lol.
#15
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Pulling the blowers for a fresh up.Think my K planes were slowing me down being dropped down.Need to get a few more hours of driving since I've actually only driven 3-4 hours.I see no reason why I shouldn't be very close to 80mph with the 525sc package with 230 hours.Big diff from the 18' 165hp searay lol.