capt_j_low
04-09-2016, 03:48 PM
Hello fellas, first off sorry for the long post and thank y'all in advance for taking time to read my post and give any thoughts.
my current setup:
boat :flats and bay 18x8(pad hull similar to a bass boat or well a flats boat)
motor :2000 Yamaha f115
prop: rapture(Michigan wheel) 13 1/4x15
factory manual jack plate with I would say about 6" offset
running cav/av plate about even with bottom of hull maybe a bit higher( at work can't be exact right now)
dry weight is listed as a light 900lbs
dead rise unknown
ok. so when I run it WOT I get to 6100 which I believe to be the rev limit on my motor and top speed is 40mph
when I run the numbers in a prop calculator I get less than 1% slip which is hard for me to believe but that's the numbers and the speed was confirmed by gps.
My question is what size prop do yall think I can step up to to get a higher top end. My ultimate goal is to get top end as high as possible so I can then cruise at around 40 without running WOT. I do sometimes run roundtrip 60+ miles in a day of fishing. >30 miles roundtrip without trying so I just wanna be able to cruise a bit faster. Right now I can cruise at 35mph at about 5600 I think.
The thing is I have been told by a prop guy that I will not be able to get much more or better than the 15"pitch(me and him disagree on what the rev limit on my motor is and I think that is why he is thinking I cant do better) I don't agree with that just yet. I believe that since I believe I am hitting the REV limiter that I got some HP left. I have looked at a few Yamaha performance bulletins and based on those I can't see how in the great blue world I can't get at least 45-47 with a 19"pitch prop. I will include a link to three different Yamaha performance bulletins below.
:thumbsup: Any help or thoughts would be appreciated even if you think I am crazy and have the same frame of mind as the guy that told me I can't get but maybe 1 or 2 more mph :thumbsup:
this one has weight similar to mine but has a narrower beam and maybe less tested weight
http://yamahaoutboards.com/sites/default/files/bulletins/bulletin_4stroke_midthrustjetport_pro_sa6466.tmp.pdf
this second one might be closer but it still has a higher dry weight of 500#... and still running a 19p
http://yamahaoutboards.com/sites/default/files/bulletins/HWS_18Redfisher_F115LA_2013-06-20_FLT.pdf
and a bass boat just because.
http://yamahaoutboards.com/sites/default/files/bulletins/bulletin_4stroke_midthrustjetport_pro_sa6e51.tmp.pdf
Anyways, Thanks again for taking the time to check out my post and help.
my current setup:
boat :flats and bay 18x8(pad hull similar to a bass boat or well a flats boat)
motor :2000 Yamaha f115
prop: rapture(Michigan wheel) 13 1/4x15
factory manual jack plate with I would say about 6" offset
running cav/av plate about even with bottom of hull maybe a bit higher( at work can't be exact right now)
dry weight is listed as a light 900lbs
dead rise unknown
ok. so when I run it WOT I get to 6100 which I believe to be the rev limit on my motor and top speed is 40mph
when I run the numbers in a prop calculator I get less than 1% slip which is hard for me to believe but that's the numbers and the speed was confirmed by gps.
My question is what size prop do yall think I can step up to to get a higher top end. My ultimate goal is to get top end as high as possible so I can then cruise at around 40 without running WOT. I do sometimes run roundtrip 60+ miles in a day of fishing. >30 miles roundtrip without trying so I just wanna be able to cruise a bit faster. Right now I can cruise at 35mph at about 5600 I think.
The thing is I have been told by a prop guy that I will not be able to get much more or better than the 15"pitch(me and him disagree on what the rev limit on my motor is and I think that is why he is thinking I cant do better) I don't agree with that just yet. I believe that since I believe I am hitting the REV limiter that I got some HP left. I have looked at a few Yamaha performance bulletins and based on those I can't see how in the great blue world I can't get at least 45-47 with a 19"pitch prop. I will include a link to three different Yamaha performance bulletins below.
:thumbsup: Any help or thoughts would be appreciated even if you think I am crazy and have the same frame of mind as the guy that told me I can't get but maybe 1 or 2 more mph :thumbsup:
this one has weight similar to mine but has a narrower beam and maybe less tested weight
http://yamahaoutboards.com/sites/default/files/bulletins/bulletin_4stroke_midthrustjetport_pro_sa6466.tmp.pdf
this second one might be closer but it still has a higher dry weight of 500#... and still running a 19p
http://yamahaoutboards.com/sites/default/files/bulletins/HWS_18Redfisher_F115LA_2013-06-20_FLT.pdf
and a bass boat just because.
http://yamahaoutboards.com/sites/default/files/bulletins/bulletin_4stroke_midthrustjetport_pro_sa6e51.tmp.pdf
Anyways, Thanks again for taking the time to check out my post and help.