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Thread: setback vs top end speed
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11-27-2017, 07:08 PM #16
10-4 brother it just don't make sense ? Were trying to do the almost same thing here but we get ice LOL so we use it in our drinks hibernate with mama and test in spring .
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rjdubiel liked this post
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01-17-2018, 02:16 PM #17Member
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Interesting thread. I am toying with removing 5.5” setback on my 8metre stepped hull. Worried I’ll loose speed. Surely the weight of a bracket has some negative impact too? Prop runs level with rear hull and runs fine. Needs tabs to plane though.
Only reason I want to remove is cause I can’t trim the engine up out of the water. And it will spend some time living in the water this year. Surely someone done a direct comparison.
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01-17-2018, 03:07 PM #18
Ended up w/8" on my Vector. That was w/a slimmed down OMC looper, but probably still 50 lbs heavier than your motor.
That was where it was at at 101.
Motor was 2" bellow though.
That rig did lots of the things the experts said wouldnt work, including that much weight, that far back.
To me, set back is really basic.
Have a friend get a really good/close up shot or video of you at WFO.
If you have ANY up trim in the motor, as in, beyond vertical w/the water line, regardless of where the hull is, you need more set back.
Mine did everything well at 8", Id say you could do that or 10".
That was also w/a 543 lb (bare) hull too. So if yours is heavier, it would require more to see same result.I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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01-17-2018, 04:57 PM #19
i tried closer setback since this thread.....problem was i couldnt get motor low enough.....bottomed everything out and i was still 3/4" above pad....2" back it wouldnt pick bow up with any prop......if i could get closer i think i could be faster
at 6" back i never have posaitive trim.....even at WOT with nose flying
i changed props and got nose down
im dead even with pad at 6" back81' HYDROSTREAM VECTOR / slightly Modified 200
before and after:http://www.screamandfly.com/showthre...inished!/page3
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01-17-2018, 05:40 PM #20
since this thread im running a v-4 on the 16ft Allison 5 in set back,but now im building a 200hp merc v-6 for it with cut down 15in mid so now it will be a totally different boat come spring so now I will start with the same 5 in set back and go from there. Im thinking closer than farther but will have to wait its cold as hell out LOL
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01-21-2018, 08:44 PM #21
cody post a picture of mine running the 6inch setback and 20inch mid on my comp vking ... mine runs nose high with one prop next prop runs flat ... 26 hoss triton and 260 trim down to gain speed .. 30p hoss triton trim up to gain speed ... lol idk
1979 hydrostream vector sold
2001 american offshore 26 twin 300 promaxs
2006 hydrostream comp vking horned 225 promax/
1986 23ft twin engine eliminator twin 225 promaxs SOLD
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texasvector liked this post
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01-21-2018, 09:07 PM #221980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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texasvector liked this post
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01-22-2018, 07:22 AM #23
Scribed
"12" Super Lite Tunnel (11') "88" 25 Yammy twin carb "BANANA SPLIT"
"77" Hydrostream Viper "87" 140 Rude heavy modded w/15" mid, Bobs nose and lwp "DANGER ZONE"
"72" Checkmate MX-13 "80" 75 Rude w/15"mid and Nitro Lu (to be restored)
"Too much is never enough" Keith Richards " Dreams become reality via hard work and perseverance" G.A.Carbonneau
"This coming from an old man that strapped two bananas together, hung a motor on it and calls it a boat" XstreamVking
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01-25-2018, 10:22 PM #24
I think u can work with a prop guy and make it work either way A good prop guy can totally change the characteristics of a prop.
Nitrous is like a slut. u wanna hit it but you know there will be consequences.
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01-26-2018, 06:11 PM #25
Mine runs best @ 1 1/2 to 2 degrees negative. I'm 1/2 inch back,and 1/2 inch above,running a 26 Tillman Yamaha.Runs flat,0 to 100 quick,and never touch the trim.
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W2F a V-King, texasvector liked this post
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12-25-2018, 03:19 AM #26
been a year...since ive taken a lil lip of the pad (about .010") and was able to raise motor a tad (around 1/4" above now)
the ET has been the ticket on keeping bow down with plenty of lift.. low rake!
still believe i could benefit if i went closer with motor but setup wont allow me to get motor low enough. and if i went farther back it would only cause more negative trim.
best yet 105.1mph
i also tried a prop spacer last time out.....slip numbers went down and speed went up81' HYDROSTREAM VECTOR / slightly Modified 200
before and after:http://www.screamandfly.com/showthre...inished!/page3
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