Robert,
Beautiful boat! Can you give us some statistics: weight, speed, range? It looks like you have a pair of the 24 volt optima packages.
I have a similar Cruise 4 setup with 12v optimas in a 40 year old 16 foot aluminum Starcraft utility, functional but not pretty. Probably similar hull shape as yours. The stripped hull is about 250 lbs, I think. With a 160 lbs of me; 70 lbs of motor, steering, and cabling; and 170 lbs of battery [650 lbs total] and the high pitch Torqeedo performance prop, I have seen 12 mph at 4 kw. With another 100 lbs. it drops to 11.5 mph.
With 8 of the optimas I can probably get a bit over an hour at WOT and achieve a range of < 12 miles. By dropping back to about 8 mph I should be able to go 25 miles.
One interesting thing happened while I was making these measurement. The voltage at the motor dropped to 40 volts when drawing 4 kw. I assumed I had run the batteries down. When I got home and measured the batteries at rest, they were about 11.5 volts on each of the four. I did not measure them individually under load. Have you had a similar experience?
With the standard prop, the speed peaked at 9 mph drawing 2.6 kw. The prop was maxing out on rpm before fully loaded.
Best wishes
Ned
On Aug 14, 2011, at 11:00 PM, Robert Hargraves wrote:
It appears that email posting shouldn't have pictures, so I loaded them into the album "Lyman 13'". The text below assumes the pictures are in 1, 2, 3, order, which they are not in the album.Bob HargravesAfter 5 weeks I have finished restoring the 1952 Lyman 13 and adding electric propulsion.I mounted the Minnkota 2 bank battery charger on the back of the forward seat.You can see the batteries below it.The helm station has the Torqeedo throttle to port. The speedometer on the right is for show; the pitot tube has been removed; the boat will never again reach 40 mph.Below is a close-up of two Optima 12 volt 75 Ah AGM batteries, in series.The life jackets are suspended on bungee cords.Here's the new bilge pump; no float switch to jam; it turns on for 2 seconds every 2.5 minutes. If there is no water there is not much current draw so it knows to shut off. To the right is a stern jump seat, under which are the cables that connect the Torqeedo motor to battery lines.On the starboard quarter are a manual bilge pump and a paddle, just in case, secured with bungee cords.Here's a close up of the Torqeedo 2.0 kW motor. The black hose to port is a washing machine drain hose that directs the bilge pump output over the transom.A view of the Torqeedo; big prop, high torque at low rpm; motor in pod at bottom.Here are the Optima AGM batteries, on their sides, in series, seen from the bow, looking aft from the front seat. The lips of the batteries are seized between the floorboards, so as not to move fore and aft. Above you can see two boards that are wedged between the batteries to keep them from jumping up and down as the boat encounters wake or waves.The 24 volt DC wiring has an on/off switch, mounted under the helm seat, out of wetness.The aft port jump seat serves to protect the connector between the battery cables (right) and the motor cables. The white and gray wires are for the (future) stern light and bilge pump.Launch is planned tomorrow, hopefully.Robert HargravesU.S. Merchant Marine OfficerMaster of Steam, Motor, or Auxiliary Sail Vessels of not more than 100 gross tons upon Inland Waters
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