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Narrowboats

My narrowboat is definitely different: The rudder seems steadier and my initial impression was that I was getting a slightly greater speed for given engine rpm. However, speed trials upstream and downstream (to eliminate the effect of the current) indicated that top speed was only about 0.1 mph above previous at 6.3 mph; this could also be because of the clean bottom, and is within instrument error, so it is difficult to be conclusive. Maximum engine speed is now higher by 150 rpm, i.e. 2,950 rpm at full throttle. Noise and vibration at cruising speed (2,000 rpm) seem to be much improved, with a much smoother overall ride. It is in manoeuvring that the propeller comes into its own. The paddle-wheel effect is much reduced and the boat stops very much quicker and, of course, almost in a straight line. Initial trials indicate stopping in 10 seconds from full ahead, but I will be repeating the exercise to ensure consistent results. She also seems to accelerate better. Running astern, she achieved 3.5 mph and - shock of shocks - is now steerable under stern way. Coming alongside is a dream, though I did like a challenge before!  In all my experience with single screw craft, this is the best behaviour I have ever encountered.

In summary, I am absolutely delighted with the new propeller and thought you would welcome the feedback. You are welcome to use my comments how you wish - I have over 50 years experience of handling boats, and have a degrees in both Mechanical and Marine Engineering." 

Regards

Lieutenant Commander Carr
BSc MSc CEng MIMechE Royal Navy.

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We had our Axiom fitted on Friday. We were anxious about our 65ft 22-ton monster ever being tamed - but you have done it. You have given us a new boat!

The boat handled beautifully on the upper Thames with and against the current, with lots of power and good handling through very tight curves, and stopped in half a length.

Even on the shallow Oxford canal it is a dream. We can now negotiate those tight turns as never before, stop almost immediately and go backwards as needed. No more over-revving the Gardner to remain off the gates in the lock, and handling confidence is restored.

All your promises seem fulfilled and although we have just a few days of experience, we are really delighted.

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Explore with confidence.

Salter's Lode, Tidal section of the River Great Ouse.

The Axiom is a beautifully smooth propeller that move's you through the water with a minimum of vibration, noise and wake. The propeller gives the narrowboat the ability to stop and reverse a boat of any length, with complete control and confidence. This control is due to the propellers equal thrust in both ahead and astern. You have the same power going in reverse as you do moving forward. By redesigning the blade's to simpler, symmetrical shape the Axiom blade provides smooth, positive and precise handling. Unpredictable sideways movement (prop walk) that causes much frustration for the narrowboater in Locks, Marinas and Moorings is largely removed.

The Axiom Propellers has a powerful grip on the water that allows it to work at very low revs and shallow water, aiding in maneuvering in modern marinas and narrow crowded Canals.This bite and grip on the water is what give the boat far superior braking over the traditional marine screw design that has very little astern power, this makes stopping inconsistent and unpredictable with the marine screw.

The blade design is unique enough to be granted its own worldwide patents and has been put though is paces here in the UK on deep, fast flowing Rivers and shallow Canals alike.

Every Axiom Propeller is cast from virgin stock AB2 bronze and is cast by Clements Engineering Ltd of Bedfordshire, England.

The main information that we will need to know to begin sizing the perfect Axiom for your narrowboat is: