SOB setback question (Poll?)

[2.5-21]

I know this can be a tricky question almost like asking about synthetic oil brands!
How much setback is the right amount on a 21 superboat/shadow/challenger with a big heavy 3.0 vs a nice light 2.5?

I will answer first my 03 21 superboat with a 3.0 liter on it ran real well with a 12 inch stainless marine setback box and a 6" hydraulic jack total of 18" setback. I did try an 18" stainless bracket with a 6" jack total of 24" setback and it was a handful and did not handle well at all.

Just curious as to what guys are now finding to work well in all conditions.

[TooStroked]

I think you're going to find that the guys just going for the big (top end) number will tell you that the bigger the setback, the better. The racers will tell you that less setback is generally better for racing. But, the type of handling that you prefer and the type of water you do most of your boating in will have a pretty big effect on how much you need too.

[vnemous]

Does setback include the notch on notched boats?

[Jamescole]

22" is best for top end only. 16 is fast with some rough water abiliy. 14 is the popular setup.

[TooStroked]

22" is best for top end only. 16 is fast with some rough water abiliy. 14 is the popular setup.

I'd suggest that statement might need a bit of qualification since some hulls require more (or less) setback than others. For instance, my old Checkmate Spectra 201 needed the outboard in a different Zip Code than the hull to get the bow up. My current 22' Progression carries the bow very nicely with only 8" of setback.

[2.5-21]

[QUOTE=2.5-21;2544636]
How much setback is the right amount on a 21 superboat/shadow/challenger with a big heavy 3.0 vs a nice light 2.5?

[2.5-21]

Post some pictures of what your running manual,hydraulic,home made etc.

[Jamescole]

Twostroked,
He asked about challenger, super, shadow... Your mentioning boats not asked about.

[TooStroked]

Twostroked,
He asked about challenger, super, shadow... Your mentioning boats not asked about.

Good point. I missed that. My bad.

[berzerko]

I'm running 10 now, and it runs real stable with no hop or porpoise but takes a lot of trim to get it to fly, think I'm going to go 14" bobs and maybe add 2" spacers if need be

[ghost28]

I ran a 12" box with a 5-1/2" Jack for a total of 17-1/2" with a yamaha 250 and it ran nice like that....in big swells it was a little nose happy unless i was nice with the happy button but overall i liked it.....the boat was 3mph faster with the additional jackplate setback on my boat and i didnt really thing it was too flighty but i wasnt a big water guy....if i was a big water guy i would sacrifice the top end and run 10"....My.02

[Donat]

I run 14" and 3.0 and would not go more if regularly run rough conditions. I'd like to cut my setback to 8" but there is no room for rigging with full transom

[2.5-21]

I run 14" and 3.0 and would not go more if regularly run rough conditions. I'd like to cut my setback to 8" but there is no room for rigging with full transom
do you have a picture of your setback/setup?

[Trimmed Out15]

IMO it's hard to say what's gonna work for you compared to others. Every boat is different and every driver has a different feel for what's perfect. I run 10" of setback and that works for me but a lot of guys run a lot more setback. It sucks having to try different setups but ultimately that is the only way to get it "perfect". This is how mine flies...

http://youtu.be/KBoYUJ58sLE

[Donat]

Pics
http://i1222.photobucket.com/albums/dd495/Donatk77/null_zps73d38376.jpg
http://i1222.photobucket.com/albums/dd495/Donatk77/null_zpsaa6db1f8.jpg

[dnelson964]

Does setback include the notch on notched boats?

Yes.......

[dnelson964]

I'm running 10 now, and it runs real stable with no hop or porpoise but takes a lot of trim to get it to fly, think I'm going to go 14" bobs and maybe add 2" spacers if need be


You should go right to 16" or 17"...:D.......I might even have parts for you.

[2.5-21]

Pics
http://i1222.photobucket.com/albums/dd495/Donatk77/null_zps73d38376.jpg
http://i1222.photobucket.com/albums/dd495/Donatk77/null_zpsaa6db1f8.jpg



Thanks good looking set up who makes the box you have the jackplate attached to? how does it trim when motor is lower behind boat? what kinda speed you seeing with that set up?

[Donat]

Hydrodynamics 6" setback. Once jack is all the way up it trims out enough for trailing and almost any shallow water. I rarely run engine all the way down, skid plate helps planning tremendously even with positive trim. 82 mph so far...:)

[fast fun 2]

I had 8, it was great. 10 was flighty but a lot of fun, and still could fly pretty level. None of that 3.0L crap either, all 2.5s. Yall can think what ya want, REAL rough water will eat a boat with 12+ inches alive. Period.

[TooStroked]

I had 8, it was great. 10 was flighty but a lot of fun, and still could fly pretty level. None of that 3.0L crap either, all 2.5s. Yall can think what ya want, REAL rough water will eat a boat with 12+ inches alive. Period.

I was waiting for one of the only guys here with real racing experience to chime in and validate what I'd originally proposed. Thanks Johnny!

[Greg G]

I run 14" and a 3.0 and would not go more if regularly run in rough conditions. I'd like to cut my setback to 8" but there is no room for rigging with full transom

I wonder Donat if trying a Paralift would be an option. 12" setback at flat I believe and lessens as you raise it up even with the pad. I'm not sure how much vertical lift it has at full tilt up but it is a lot and might do very nicely clearing your Rallysports closed transom.

[dnelson964]

I wonder Donat if trying a Paralift would be an option. 12" setback at flat I believe and lessens as you raise it up even with the pad. I'm not sure how much vertical lift it has at full tilt up but it is a lot and might do very nicely clearing your Rallysports closed transom.

I know someone with a 10" or 12" paralift on a 21' Challenger that will be taking it off...if any interest in someone purchasing it please pm me..

[Jamescole]

Here's what 22" looks like...
http://i1130.photobucket.com/albums/m533/OneCycle/DSC_0545-1.jpg (http://s1130.photobucket.com/user/OneCycle/media/DSC_0545-1.jpg.html)

http://i1130.photobucket.com/albums/m533/OneCycle/DSC_0576.jpg (http://s1130.photobucket.com/user/OneCycle/media/DSC_0576.jpg.html)

http://i1130.photobucket.com/albums/m533/OneCycle/DSC_0434.jpg (http://s1130.photobucket.com/user/OneCycle/media/DSC_0434.jpg.html)

[Donat]

(90mph) Ill get there James. I'm still one season behind ya;)