I am trying to finalize my AP system. I will be getting the Navpilot 300 but Im having a hard time nailing down the Pump to go with it. I have a 26' GW with twin counter rotating 250's. The steering is seastar with a single ram. Where Im runnnig into a problem is with the ram cu. in. spec. There is nothing written on it......or its since been worn off. Is there anyway to estimate/know what the ram cu in should be on a system like this? Is that wrong to ask?
AP Pump Help needed
- Thread starter Seashift
- Start date
If there is no model number or anything, please get the measurements of the cylinder (not the arm). Get the length of the cylinder tube and now big it is (radius) and we should be able to get close to finding the volume of the cylinder to help you find the correct pump.
I measured it at 11" L x 1.5" dia. What do you think? A basic calc says 77.75 but that # doesnt make sense to me?
The volume of the cylinder is roughly: 19.44 cubic inches.
This was calculated using the formula for the volume of a cylinder, which is V=pir2h, with a length (h) of 11 inches and a radius (r) of 0.75 inches (half of the 1.5 inch diameter).
The pump you would want is the PUMPOCT16-12 which would be rated from 15.1 to 24 cubic inches cylinders.
This was calculated using the formula for the volume of a cylinder, which is V=pir2h, with a length (h) of 11 inches and a radius (r) of 0.75 inches (half of the 1.5 inch diameter).
The pump you would want is the PUMPOCT16-12 which would be rated from 15.1 to 24 cubic inches cylinders.
Hmmm, that volume is larger than any front mount cylinder that is made by seastar..........I must have measured wrong?
Definitely double check your measurements and even my calculation. Larger size pumps would pull more current and need a larger pilot like the NP711C. You can always post a photo with your measurements and maybe someone here will recognize the model.
Two engines on many steering systems would have (two smaller) cylinders running about 8ci each (total of 16ci to push with pump) it doesn't sound your single cylinder is too far off from that. As he says, double check before you pull the trigger.
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