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my boss just bought a '78 vector

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Re: my boss just bought a '78 vector

by transomstand » Aug 17, 2012 3:59 pm

brian1570 wrote:65-70 mph with no porpoising is the goal. We just installed the jack plate this morning. Which has 5.5" of set back and we are going to start level with the pad and go from there. Prop is still a 24p chopper. I think he also has a set of solid motor mounts waiting to go on as well.

Oh and I meant to mention the whale tale. Not sure if it's hurting us or helping.

[ Post made via iPhone ] Image
Try it with the plate and see how it changes it.

Re: my boss just bought a '78 vector

by Surface Scratcher » Aug 17, 2012 1:56 pm

Just like chine walking, porpoising is a cycle. It starts and if not corrected, it gets worse. Once you make a correction, it can change the cycle and things start to level out. What I'm trying to say is, as you get to know the boat, you will anticipate a cycle. Make your correction early, whether it is a trim adjustment, acceleration, etc., and then check to see if it is getting better. If so, don't make more adjustments, let the cycle finish.

Of course, moving weight forward may help but is a speed killer. Motor height and prop selection could also help. This is all part of fun of getting it set up. :up:

Re: my boss just bought a '78 vector

by brian1570 » Aug 17, 2012 11:16 am

65-70 mph with no porpoising is the goal. We just installed the jack plate this morning. Which has 5.5" of set back and we are going to start level with the pad and go from there. Prop is still a 24p chopper. I think he also has a set of solid motor mounts waiting to go on as well.

Oh and I meant to mention the whale tale. Not sure if it's hurting us or helping.

[ Post made via iPhone ] Image

Re: my boss just bought a '78 vector

by transomstand » Aug 17, 2012 10:18 am

brian1570 wrote:Haha ok I know that much. I guess should have asked how does one go about solving the problem?

[ Post made via iPhone ] Image
That's the $64,000 question. This is where experience plays such a big part, you need to feel what the thing wants, not so easy when you don't know what your feeling.

Most likely, it will not be a single change, and be extremely sceptical of "all purpose" answers like "just raise the motor", or "move the battery", etc.

The first order of business, is to decide exactly what we want this boat to do for us. Do we want a fun boat to bang around on weekends, with a top speed of 65 or 70, or do we want the most killer fast thing on the water?

Either way, we need to start from scratch, and examine the hull, engine and setup from the beginning, to insure we have what we need to make it all work. Wish I had a better, easier, and less costly answer, but that's the "fun" of performance boating.

Re: my boss just bought a '78 vector

by brian1570 » Aug 17, 2012 9:40 am

Haha ok I know that much. I guess should have asked how does one go about solving the problem?

[ Post made via iPhone ] Image

Re: my boss just bought a '78 vector

by transomstand » Aug 17, 2012 8:57 am

brian1570 wrote:So what exactly causes porpoising in these boats? Conventional knowledge really doesn't seem to apply to these hulls.

[ Post made via iPhone ] Image
A VERY complex question, but it all comes down to angle of attack. As the hull "pushes" through the water, a wave builds in front of it, as the boat "climbs" it, the hull rises, as it "falls off" the other side, the hull drops.

Re: my boss just bought a '78 vector

by brian1570 » Aug 17, 2012 8:35 am

So what exactly causes porpoising in these boats? Conventional knowledge really doesn't seem to apply to these hulls.

[ Post made via iPhone ] Image

Re: my boss just bought a '78 vector

by brian1570 » Aug 16, 2012 12:02 am

Surface Scratcher wrote:Welcome, that's a great looking Stream. I'm always glad to see a nice Hydrostream in Texas.

Pete is correct, as always 8-) . If you know someone with an over the hub chopper, maybe a 24 pitch, borrow it. It may not be the perfect screw, but I'll bet you'll like it a lot better. :boating:
we already have a 24 solid hub chopper, used it today. it hauled ***. started to porpoise and walk a little though. i think the solo run was 62 mph or so. and it left fairly well with the 3 of us. so it leaves now, just gotta figure out the porpoising issue now.

Re: my boss just bought a '78 vector

by transomstand » Aug 15, 2012 7:41 pm

RussF wrote:Pete is goin to kill me for this BUT I LIKE MY Trophy Plus 28................... :o
I knew you were hopeless long ago :roll:

When ya gonna put up a 28 ET for sale???

Re: my boss just bought a '78 vector

by RussF » Aug 15, 2012 6:39 pm

Pete is goin to kill me for this BUT I LIKE MY Trophy Plus 28................... :o

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