Polar/Dynasty 1886T

[WLJ]

Just bought this boat used. 18ft. Evenrude 70 4stroke. First tunnel hull. Had it in the water once. Seemed to throw a lot of water back over the transome. How do I tell if the motor is mounted at the right height? Hard to tell in photo, but cavitation plate is about an inch & 1/2 below straight line from bottom of tunnel. Thanks, Billy J. (WLJ)

[tunnels]

Originally Posted by WLJ

Just bought this boat used. 18ft. Evenrude 70 4stroke. First tunnel hull. Had it in the water once. Seemed to throw a lot of water back over the transome. How do I tell if the motor is mounted at the right height? Hard to tell in photo, but cavitation plate is about an inch & 1/2 below straight line from bottom of tunnel. Thanks, Billy J. (WLJ)

Thats not a tunnel hull its a hull with a bit missing out of the back !!
Looks like it could create more problems than it could solve Its shape could cause the back of the hull to suck down at slow speeds maybe till the air gets into the cavity . There needs to be a sharp step in the very front of the hole to shed the water but i cant see te point of it .

[spkltrt]

[Thats not a tunnel hull its a hull with a bit missing out of the back]

can you helpme with that phrase, gorwing up in so.tx. they call this slot in the hull a tunnel its usualy about a 1/3rd the length of the boat with a gradual sloap, the right design will allow the entire prop to be above the bottom of the boat.