Intro and some questions

rogerbum · Posted: Mon Jul 03, 2006 11:30 am Post subject:

Here's an image of how the 2nd bilge pump was installed. It shows the install of the brass through-hull for the transducer. On my boat this is under the motor well and can't be stepped upon. Note: this image was taken before the factory upgraded the fuel tank mounts and replaced the starboard covers in front of them with fiberglass covers.
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Larry H · Posted: Mon Jul 03, 2006 2:08 pm Post subject:

khofmann,

About a thru hull transducer,

It's not a good idea to put anything which protrudes thru the hull in front of the propeller! The last three feet or so of hull bottom before the prop should be smooth to avoid causing cavitation. A transducer sticking out of the bottom in front of the propeller can cause cavitation, making bubbles and disturbing the water flow to the prop and slowing the boat.

Any thru hull transducer or water pickup ON A SINGLE ENGINE BOAT, should be offset to one side of the centerline by about 18 inches, or as far away from the centerline as possible. This also applies to a transom mounted transducer. Dual motor boats could use the centerline location.

Captains Cat · Posted: Mon Jul 03, 2006 5:51 pm Post subject:

Larry, you're right but look at his profile, he has twin 40's. Nothing in front of the props, looks like a good spot to me.

Charlie

flagold · Posted: Mon Jul 03, 2006 7:10 pm Post subject:

Probably not much harm done, as twins lose efficiency because they cavitate off each other anyway. Mr. Green

Larry H · Posted: Mon Jul 03, 2006 7:29 pm Post subject:

Charlie,

Thanks, I fixed my post.

I was replying to the original question about a 22 Classic, a single engine boat.