Prop Shaft

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Originally Posted by Hotboat

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 :D

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

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Originally Posted by gn7

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

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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.

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Originally Posted by ogshotgun

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

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What's the pitch on your prop?

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Originally Posted by HotWater

What's the pitch on your prop?

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

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Originally Posted by ogshotgun

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

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How much hp?

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Originally Posted by HotWater

How much hp?

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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

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Originally Posted by ogshotgun

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

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

Attachment 39623

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Originally Posted by HotWater

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

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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

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Originally Posted by ogshotgun

Attachment 39623
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

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How fast does your boat go?

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Originally Posted by ogshotgun

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.

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