I did a speed test on the 40lb mini kota and in 5th or top gear it does a blistering 7.5 kph = 4.04967603 knots to 8 kph = 4.31965443 knots.
Considering the current flow at Port Phillip heads gets up to six knots under normal conditions and may exceed nine knots in extreme conditions. I don't think I'll try for Kingies there this season.
I have been out demo'ing a few yaks in the last few weeks. Kayaks for me are hard to settle on cuz I am a big bloke of 130kgs.
Perception Swing: Best all around for the little guys under 100kgs. Fast Stable and Vesatile
Cobra Tourer: The most impressive to be for stability, speed, and tracking. you can see the potential for this kayak. Best factory finish of the Cobras I tested. Imagine a fast Ocean Kayak Scrambler XT
Cobra Fish and Dive: I looked forward to playing with this for almost a year and when I finally did, it left much to be desired. The wind kills it, it's too wide for an efficent paddle stroke, and the foot wells were too narrow. you sit pigeon toed with your knees pointed inward. The positive thing was that it was a dry ride.
Cobra Explorer: Pesssssshhh NOT IMPRESSED you're better off with the Perception Swing by far!
Ocean Kayak Scrambler XT: Roomy, semi slow but faster than the Fish and Dive by a long shot. Very comparable to the Cobra Tourer for stability. I've heard that this one is a top choice for landbased boys that use kayaks to get to their spot.
Will be trying out a couple more from Kayak Direct shortly!
FYI, Kayak direct has a top secret design coming into New Zealand from Aussie shortly. I've seen the pics and it's impressive looking. comes with an electric trolling motor. It's called the "Tempo Fisher"