CSH set up.

[Wayne mtl qc]

I know I've seen this posted on a post some time ago but I can't find it so I'll ask the question. When the prop is further back from the bottom of the boat you get better ? & closer to the bottom ? Which is better for acceleration.

[drbyrne55]

I know I've seen this posted on a post some time ago but I can't find it so I'll ask the question. When the prop is further back from the bottom of the boat you get better ? & closer to the bottom ? Which is better for acceleration.

Entering our third year, probably equivalent to removing training wheels ..... for what it's worth we find going back will allow better pumping and lifts the bow. It also lengthens the prop "triangle" and adds stability.

[sponsonhead]

Say What?

Entering our third year, probably equivalent to removing training wheels .....

THIRD year????? What are you talking about? You guys started racing in 2006. By most common math calculations, that would make this your fifth year, sport.

A lot of folks probably feel that the training wheels came off quite some time ago, and the "I'm a just a new guy asking lots of questions" act has pretty much run its course, don't you think?

See you at Lawrence,

R-19

[Trihedral_1]

I know I've seen this posted on a post some time ago but I can't find it so I'll ask the question. When the prop is further back from the bottom of the boat you get better ? & closer to the bottom ? Which is better for acceleration.

This is really a fine tuning adjustment if the motor is getting enough cooling & it's at 3/4" prop depth. Further back will get more water to the motor, and make the boat more stable.
Forward I believe is faster, but risks overheating and less stability. Remember if you move it forward you have to remove some shims to keep the height at 3/4. (I think the thread about this & cooling is under "technical discussion").


Jimi O (305-R)

[sponsonhead]

But seriously, folks....

I know I've seen this posted on a post some time ago but I can't find it so I'll ask the question. When the prop is further back from the bottom of the boat you get better ? & closer to the bottom ? Which is better for acceleration.

It also depends on the type of boat: Does the boat have a tunnel in the bottom? flat bottom? step? What is the angle of the transom? That also makes a difference as it relates to cooling.

With our first CSH, a Sorensen with no tunnel or break in the bottom, it had a real shallow transom angle, and we could never run it higher than 3/4" high, so we were limited on what we could do with set up and motor placement.

We went to a Bezoat with a tunnel in the bottom, and a much steeper transom angle, and we used to run kicked in a bunch with the prop shaft height at 7/16" below the bottom. Cooled fine, and was super fast, but a little weak on corner speed and punch.

On to a Hemp boat. Not quite the top end we had in the Bezoat, but corner and acceleration up the ying-yang. A good trade off for us. Initially we ran it up around 1/2" below the bottom, it cooled fine. Then the height change rule, and we dropped it down to 3/4". Ran about the same.

Point of all this being it largely depends upon what you're starting with boat-wise, and there are trade-offs every step of the way. Good luck, and let us know what works for you.

R-19

[propnuts]

For what it's worth

The only boat I played with motor mounting distance was our ASH. We moved the motor in about 3/4" and gained a fair bit of speed, but also lost a fair bit of stability (luckily my driver could handle it at that time). BUT ASH height is 1 3/8" and cooling is not an issue. I would trust Jimi O when it comes to moving the motor back taking care of cooling, and you may find that to be your limiting factor (it is for us with the Yamato).

[ZUL8TR]

This may be the link>>>>>>>>>>>&g t;>>>>.

I know I've seen this posted on a post some time ago but I can't find it so I'll ask the question. When the prop is further back from the bottom of the boat you get better ? & closer to the bottom ? Which is better for acceleration.

http://www.hydroracer.net/forums/showthread.php?t=18535