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prop in tunnel

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Old 03-21-2025 | 09:09 PM
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Default prop in tunnel

just completing my drawings
26 ft trailered,
Cummins 355 diesel
44 degree deadrise station 2
27 midlength W.L
1100 l fuel , just in case
speed max 43 knots half load
30 knots cruise
prop in tunnel enables ramp splash
cannot post drawings, site will not allow
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Old 03-22-2025 | 07:24 AM
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prop in tunnel was used by penn yan and really sucked but you could get into shallow water
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Old 03-22-2025 | 07:46 AM
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From: ankeny,ia.
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44 degree dead rise… at the transom?

The prop tunnel isn’t good for lift,
( for a planing hull) neither is a 44*
dead rise, I’m not seeing this getting
to 49 mph.

Last edited by JaayTeee; 03-22-2025 at 10:51 AM.
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Old 03-23-2025 | 10:57 PM
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Originally Posted by stuarth
just completing my drawings
26 ft trailered,
Cummins 355 diesel
44 degree deadrise station 2
27 midlength W.L
1100 l fuel , just in case
speed max 43 knots half load
30 knots cruise
prop in tunnel enables ramp splash
cannot post drawings, site will not allow
Take a screen grab or convert your plans to a jpg and then post.

Tunnels behave a bit like a jet system. A shrouded prop at the very least.


A 44° deadrise means your hull has almost a 90° vee. Not great for lift, shallow running, or stability. Maybe it was a typo?

Are you proposing your prop tunnel location where the delta pad would be?

Let's see some pics.


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