CY reviews: Zipwake Interceptor System


Mar 9, 2022

By Andy Adams

With the Zipwake turned off the boat rides bow up and needs more throttle

Andy’s full review will appear in the April edition of Canadian Yachting magazine!

I’ve been doing powerboat reviews for Canadian Yachting magazine for over 40 years now and I want to confess to a bias I have – I don’t use the trim tabs in my reviews. I want to feel how the boat naturally runs without using the tabs to adjust the ride angle or the side-to-side trim.

As experienced owners know, most powerboats operate more efficiently when the trim tabs are used with skill and understanding, but you need to have experience with the boat to know how it behaves under different conditions of load and trim to do that. And those factors can vary considerably.

Trim systems work by creating drag in one form or another. As the tab is deployed downwards into the water, it creates pressure that amounts to lift at the transom where the tabs are mounted. The tabs can be operated independently port and starboard and by using more “tab” on one side, you can counter the effects of an uneven load in the boat, or pressure from side winds.

ZipwakeWith the Zipwake on, the boat levels off and gains speed at the same throttle setting

Conventional trim tab systems have been used on boats, especially larger boats, since long before I started my writing career. Recently these systems have been improved with lighted indicators and much faster deployment, but on many boats, the tabs need a few seconds to deploy fully and the boat actually takes a little time to respond. As a result, I have often “over-tabbed” on boats I’m not familiar with, causing them to heel over too much at first.

In the last few years, a new system has come on the market and these are called “interceptors”. Zipwake is the brand name and the interceptors are not flat tabs that extend behind the boat, they are blades that drop vertically from the edge of the transom.

IMTRA is the company that brings Zipwake interceptors into our market and to me, it’s counterintuitive that these would work. I am accustomed to trim tabs which are like a flat metal panel extending out beyond the stern of the boat, that can be pressed down into the water by hydraulic or electromagnetic rams.

Interceptors work differently. Instead of being a flat tab, the interceptor is a blade attached to the trailing edge of the transom. The interceptor blade drops vertically, just a few millimetres, from the trailing edge of the transom.

It looks to me like this would create a lot of drag but apparently, it doesn’t work that way. Instead, it creates lift, but with a smaller surface than a trim tab would have.

Read Andy’s full article for complete information. Andy Adams is the editor of Canadian Yachting.

Neptunus 650F Review

Neptunus 650F 400

By Andy Adams

Over the years Canadian Yachting has had the pleasure of doing several boat review articles on new Neptunus models and we are familiar with the qualities that Neptunus is famous for. They have all been exceptional yachts, but this is the one I would most want to own myself. It’s a personal choice and a matter of taste as to whether you would prefer to have a sedan express model or a flybridge but in my opinion, the flybridge layout offers some wonderful attributes.

We met with Neptunus Managing Director Jan Willem De Jong this past fall to take the new Neptunus 650F out in Lake Ontario. 

Read More


The Other Virgin Islands

Sunset off St John

By Mark Stevens

I was first seduced by the United States Virgin Islands during a ferry ride from St. Thomas to Tortola to begin one of our earliest British Virgin Islands charters nearly twenty years ago.

A perfect sunset off St. John with St. Thomas views for backdrop.

Clearing Pillsbury Sound, surrounded by voluptuous emerald mountains as the ferry sliced through royal blue waters, I was struck by the unspoiled ambiance of St. John, the island gliding past our starboard beam and the irresistible charm of a village called Cruz Bay visible from our quarter stern.

Read More