I have an old Motorguide HVT3700 trolling motor that I need a prop for. I would also like to get a manual. It is rated a 37lbs of thrust.
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Instead of trying to figure out which sized trolling motor prop is compatible with your motor, you can focus on selecting a prop that matches your needs. Additionally, all props use the same MotorGuide Prop Nut Kit.
The propeller choice directly affects the engine RPM and therefore its performance. Choose a propeller that puts the engine RPM at the midpoint or higher of the wide open throttle (WOT) range with a normal load. This operating range will translate to the highest horsepower available from your outboard.
Choosing the wrong prop or continuing to use a damaged prop can decrease boat performance, increase fuel consumption, and potentially damage your engine and transmission.
It is important to understand that the larger the propeller, the greater the engine torque required to spin that propeller at the speed necessary to generate the thrust required to sustain the forward motion of our aircraft.
These dimensions describe the propeller, usually in inches, and are always stated as diameter x pitch. For example, a propeller described as 14.5 x 19 has a diameter of 14.5 inches and a pitch of 19 inches. These dimensions are often stamped or cast right on the propeller.
increasing area and number of turns in the coil. increasing the magnetic field. No worries!
If it is lead acid battery, you can draw 50% of total energy stored. So you may be able to draw 10 Ah, and the motor will run for 2 hours. If it is Li ion battery, you can go to 20% DOD maximum. The motor will run for 3 hours.
The proper propeller size for your boat and engine combination is based in part on the wide open throttle (WOT) operating range for your particular engine. You can find this in your operator`s manual, expressed in terms of a certain horsepower at a certain r.p.m.
As a rule, a stainless-steel prop of the same pitch and diameter will make your boat go faster — up to 2 to 3 knots, on some boats — than an aluminum prop. Stainless steel is stronger and can be made thinner, which allows more speed. Stainless steel also flexes less and keeps its shape at higher speeds.
Too small a propeller will produce very low torque, poor thrust and low speed at the stated RPM. The engine`s hp cannot get transmitted into the water and the propeller becomes an “egg beater”.
A bow mounted trolling motor must be mounted at the proper angle in order for it to deploy and stow correctly. Correct Deployment Angle: When deployed the shaft must be positioned as close to a 90 degree angle as possible.
The trolling motor should be placed as close to the center of the stern as possible without interfering with the operation of the main motor, if there is one. The top of the mounting bracket should be flush with the top of the stern.
Change Your Propeller
If you are running an aluminum prop, changing to even a basic stainless steel prop will usually improve top speed.
Propeller engineers determine the prop diameter based on the RPM at which the prop will be turning and the amount of power delivered to the prop. Diameter usually increases for propellers used on slower and heavier boats, and decreases for propellers intended for faster boats.
Overpitched and oversized propellers can cause an engine to work harder and hotter than it should and not allow it to reach optimal cruising rpm, resulting in poor performance and decreased engine life.
If you`re changing pitch on a recreational boat, remember that each inch of pitch is worth about 200 rpm.
If you have an aluminum prop, you should inspect for excessive metal loss (more than 10% of the blade area), extended cracks, blades that are too thin, or cavitation burns. If your prop has any of these issues, bite the bullet.
A 4-blade prop can provide a competitive edge for boats requiring maximum speed and acceleration. The increased surface area and grip can help to deliver more power to the water, resulting in faster speeds and quicker acceleration.
There are three basic types of an aircraft propeller, each with its own variations – the fixed pitch propeller, constant speed propeller or the ground adjustable propeller.
Corrosion. One of the most insidious causes of propeller damage is corrosion. This includes external corrosion that is visible on the blades, as well as internal corrosion that literally eats away at the components within the hub of a variable-pitch propeller.
With conveniences like a pneumatic Zero-G Lift-Assist system, HD+ universal sonar compatability and advanced GPS navigation options, MotorGuide trolling motors alleviate both the mental and physical work that goes into a long day on the water.
Nominal voltage: 12VDC. Voltage range: 12 – 24VDC. Current @ maximum efficiency: 0.063A. Speed @ maximum efficiency: 8600 RPM.
Assuming that the permanent magnet stays the same, torque is proportional to the number of winding turns on the stator pole multiplied by the input current. To increase the torque of a motor, either the winding turns or the input current will need to increase.
A 100Ah lithium battery will last for 1.85 hours or 1 hour 51 minutes on that trolling motor at full speed.