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Deep Impact 399 Open

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Deep Impact’s 399 Open has stepped hull that creates a cushion of air for a smoother ride and greater fuel efficiency at speed. Courtesy Mercury Marine
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Powered by three Mercury 300 Verado outboards, this 39-footer achieved a top speed of 66 mph in our test. Courtesy Mercury Marine
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The 399 Open reached planing speed in 5.4 second and accelerated from zero to 30 mph in 12 seconds. Courtesy Mercury Marine
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The hull of the Deep Impact 399 has 24 degrees of deadrise at the transom, and this resulted in a very smooth ride in our test. Courtesy Mercury Marine
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Twin 15.5-inch multi-function displays are housed in a pair of alcoves at the helm. Jim Hendricks
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The wheel of the Deep Impact 399 Open is in the center of the console, allowing room for a throttle-man on the starboard side and another crewmember to port. Jim Hendricks
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Mercury Racing Zero Effort throttle controls for the 399’s triple 300 Verados are situated starboard of the center-mounted wheel. Courtesy Mercury Marine
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Twin 55-gallon livewells are built into the transom bulkhead. Both have latching clear-acrylic lids. Jim Hendricks
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The hardtop features skylights, as well as an electronics box to house items such as VHF radios and stereo controls. Jim Hendricks
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A raised foredeck helps when throwing a castnet or fighting a fish around the bow, but this also reduces freeboard up front. Jim Hendricks
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Twin bucket seat are built into the front of the console, but without any grab handles, seating here is dicey when running in choppy seas. Jim Hendricks
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Deep Impact integrated a tackle center and rocket-launcher rod holders into the aft of the pod containing the helm seats. Note the generous number of grab handles for crewmembers when the boat is underway. Jim Hendricks
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The 399’s triple Mercury 300 Verado outboards achieved 1.25 mpg at 3,500 rpm and 33.9 mph, resulting a maximum cruising range of 538 miles. Jim Hendricks
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Coaming pads encircle the interior of the 399 Open to protect anglers thighs and knees. The gunwales are appointed with flush-mount rod holders from bow to stern. Jim Hendricks
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All hatches feature compression latches and gas-assist struts. The underside of each hatch and the locker interiors are gelcoated. Jim Hendricks
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In-sole lockers such as this forward fish box are guttered under the hatch and plumbed to drain overboard. Jim Hendricks
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