About 10 amps at 36 volts gives me an extra 1/2 to 1 mph under sail. In fact you can set the throttle at 10 amps and see it rise and fall as wind speed lowers or rises. It also is READY for instant response when needed, not like an ICE that needs to be started. The lag and poor reverse of folding props as well as the price has kept me away from them.
Dave
From: gramplarry <pfister.l@verizon.
To: electricboats@
Sent: Sat, March 6, 2010 12:59:45 PM
Subject: [Electric Boats] Re: propellers
Yes the extendo is still being made. However check your prop space if all you need is a 15 inch prop my data base shows that some of the hunters at that age had variants and a 15 inch prop will fit on a few.
FYI I have a web page that helps in determining the max diameter prop for a boat.
http://mysite. verizon.net/ resqp86c/ performanceprope llers/id41. html
It also has a bit on the extendo and how it fits into the propeller sizing issues.
Just a note about propeller sizing for sailboats. At one time 80% of the sailboats being manufactured in the USA had an atomic four gas engine. This engine was used in boats up to 40 ft in length. The boats of that period were designed for that engine and a 12 inch diameter propeller. That is why nearly everyone repowering an older boat with electric or diesel has a prop sizing problem. The atomic four was rated at 30HP at 3000 rpm and has a direct drive. slower props require a larger diameter.
--- In electricboats@ yahoogroups. com, "aweekdaysailor" <aweekdaysailor@ ...> wrote:
>
> I've been eyeing the "extendo" prop for a while as it in theory allows me to get to my ideal prop size of 15". This is still being made? This is for a 1978 Hunter 30, 5ton with 6HP motor (which I generally run at about 2.75HP for cruising @4kts). Hunters have struts and a skeg-mounted rudder, so not a lot of room, but I think i could swing it.
>
> --- In electricboats@ yahoogroups. com, "gramplarry" <pfister.l@> wrote:
> >
> > CDI stopped making the both the 2 blade and 3 blade feathering propellers about 15 years ago...
>
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