SidePower installation has a great tunnel installation guide. Placement is critical and difficult to achieve in a smaller boat. I installed a Vetus in my 268 Islander. Much better thruster than the SidePower. Documented in below post. Glad to help with questions you have. Defender runs a big sale around the end of March - I bought mine there. Make sure you get the correct tunnel - Defender stocked the thruster but didn't stock the tunnel-ordered it in.
Nice work Hookup and thanks for sharing! I'd love to have one of these, but at this point I don't have the time and ambition. I 100% agree that the bow of 27' narrow beam Grady's can be a challenge to manuver. A cross wind over 20 mph+ or a cross current in the wrong direction makes the twins...
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The bow thruster installers do earn their money. Not that its hard to do but it cuts across a number of trades and is dirty work. The boat will be a mess and need a deep cleaning when you are done.
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