Prop Shaft

[ogshotgun]

Knowingly, no. But how often will that boat see 10,500? Just saying perfection probably isn't necessary. But damn close would be much better

i have 29s in my box and run 7500 rpm all the tme .

[ogshotgun]

Not even close. The prop is running off/on the whole time.
When the ONE blade is headed down, it is doing the vast majority of the work to the point it passes straight up and down. Then its doing progressively less, while the other is beginning to do progressively more. But when they are dead horiz, neither is doing shit. No prop is loaded and unloaded like a hydro prop, and its only worse the more power you put to it.
With the twin props, they are arranged 90* out of sync, and the forward thrust is relatively even, although still off and on per side during the run. The fact they are counter rotating helps immensely with the stability of the boat, and counters the "side walking"

You can see the on/off in the rooster tails. This is actually a mild case.

Attachment 39619

don't know about 90* out of sync we ratchet ours till there at the same spot left and right , have never had one horizontal and the other vertical.

[HotWater]

i have 29s in my box and run 7500 rpm all the tme .

What's the pitch on your prop?

[ogshotgun]

What's the pitch on your prop?

15.5 ........ and its steel

[HotWater]

15.5 ........ and its steel

How much hp?

[ogshotgun]

How much hp?

when the motor was new it pulled 990 on the dyno

could use more gear, but with the casale case you have to remove the water jackets , and i run my boat on the lake and rivers.

on the tfh we turn the props over 20,000 rpm

[HotWater]

when the motor was new it pulled 990 on the dyno

could use more gear, but with the casale case you have to remove the water jackets , and i run my boat on the lake and rivers.

on the tfh we turn the props over 20,000 rpm

990hp is pretty good! I think a regular casale case can take about 37's with water jackets.

[ogshotgun]

990hp is pretty good! I think a regular casale case can take about 37's with water jackets.

according to andy at casale 29 is all you can get , before you remove the water jacket he rebuilt mine when i did the motor and that was the max gear before it hits the case
if i cut the case it will run to hot on a river lake boat

see the 29s almost touch the water jacket

[HotWater]

according to andy at casale 29 is all you can get , before you remove the water jacket he rebuilt mine when i did the motor and that was the max gear before it hits the case
if i cut the case it will run to hot on a river lake boat

see the 29s almost touch the water jacket

How fast does your boat go?

[gn7]

don't know about 90* out of sync we ratchet ours till there at the same spot left and right , have never had one horizontal and the other vertical.

Not every body is running that way.
http://www.toxicrocket.com/html/w-drive.html