It makes the boat a lot heavier, when it should have been a lot lighter (battery weight).
It makes the electric
system very complex.
capacity constrains the power output and causes significant problem when motoring for any distance.
Hallo Talbot , you are right . electric propulsion
ads weight but not much since you can take the amount of diesel
normally carried to less than half of for the FastCat
from 600 liters for an ocean crossing
to 200 liters saving 320 kilo,s there.
To my simple mind, a hybrid system is much more simple and offers significant weight savings.
A pure hybrid system is simpler but use almost as much diesel
as a pure diesel system and our reasoning is that we want to save on fuel
By hybrid, I mean the installation
of a purpose designed generator
, that is used for engine
drive. It is then available for battery
charge and running AC. A single generator
would be a simple installation
, and the battery weight savings would be substantial. You also avoid all that speed reduction by being able to use folding props.
To minimize speed reduction when not charging
battery's we lift
out of the water
As another idea for weight saving, has anybody investigated the use of titanium anchor
chain - A very quick look suggests that it is less susceptible to corrosion
, and strength to weight is much superior, hence possibility of reducing the weight - of course that would have a knock on effect of reducing the effectiveness of the anchor
Titanium is very brittle and weight for a chain is needed to keep the anchor in place
we have special chain produced for us in 8 mm made out of Duplex Stainless steel
with a weight of 1.4 kilo per meter and a breaking strength of 6400 kilo or 14400 LBS