Xcomunic8d

Guys,

im sorry to bring up another x dimension thread.

here’s what I’ve got
’72 SeaCraft Seafari 25’
its a variable deadrise hull 25.5 degrees.
the transom angle is 16 degrees (at least on mine)
it likes weight forward.
I’m putting in a LS based v8 that makes net approx 400 at flywheel…maxing out the b3.
I currently have 4 and 3 blade 20p duo prop. I anticipate raising that pitch to 26 possibly and twin 4 blades. But I’d like to see where I am before going there.

I went out and was mocking it up. I was planning on raising the x dimension 2.5” so that’s from 14 5/16 to 16 13/16”
however, I was searching here and found that bob Teague recommends the prop shaft 4-5 inches below the keel. Does that apply to b3’s as well as b1’s?

since the bottom of av plate to prop shaft centerline is approx 8.5” that means I’d need to raise the x dimension approx 4”. So from 14 5/16 to 18 5/16 give or take 1/2”.

just wanted to make sure I’m on the right track with this b3 before I cut up my restoration job here.
Thanks in advance if this has been discussed please point me to the thread I did try searching but didn’t find the answers I’m looking for, yet.

AllDodge

iTrader: (1)

No expert by a long shot with raising X, but have had b#'s for many years. Bringing the prop up on a B1 is one thing, but I don't see that as benefiting the B3. The forward prop is going to get what ever water there is, the rear prop is going to get not much more then air

Xcomunic8d

I agree seems like 2” or so is the sweet spot. I’m guessing that article did not apply to b3’s… it just said bravos but seemed way too high to me.