I have had my Autostream for 17 years and probably 25k miles and have only good to say about it. It gave me about .6 knot
increase in sailing speed and the ability to easily externally adjust the pitch
in forward and reverse to get it perfect with two different engines/drive trains. No corrosion
, but I keep it in zincs--my usage varies depending on where I am moored. I get a couple years out of one on the mooring
, but I used to have to replace them annually when I was in a hot marina. The folks at Martec were very helpful when I installed it myself. Straightforward unit, beefier construction than MaxProp IMHO. I have no relationship with the company other than a being a customer.
I believe that MIT did a study that demonstrated that there was no significant advantage to curved blades below something like 17 knots through the water
as I recall
. I will see if I can find it.
I can attest to the the sturdy construction of the prop: I once picked up a hunk of 1" polypro line that sheared the bolts in my coupling and did nothing to the prop. I have hit lumber
and wound a number of lobster traps over the years (I now live in Maine) and I just checked the prop this fall and it is still running true.
As a former delivery skipper
, I did not like those "self adjusting" props that vary pitch
by centrifugal force; I will disagree with Dockhead that it is a good thing to be maximizing torque at less than full throttle for two reasons: 1. Try picking up a mooring
when the slowest you can get the boat to move is 3 or 4 knots because you prop has automatically pitched up to maximize the torque available. and 2. Getting maximum torque out of an engine
at low speed is hard on it: like driving a care around at 15mph in 4th gear
. Diesels like to work hard, but the modern ones do not like low speed lugging. In my experience, it seemed to me that many production boat manufacturers overpitch the stock propellers on their boats for some reason. An externally adjustable prop is a huge, money
saving advantage for getting things right.
Velera T37 #373
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