| Propellers & Rudders | | | | are using air cooling - and a lower end with a propeller |
| When choosing a propeller, those variables must be | | | | on top . Inside, a flex cable links the motor crankshaft |
| considered: diameter, that is its size; pitch: the inclination | | | | to the prop. For all other engines, internally mounted in |
| of props blades, which determines the theoretical | | | | the hull, some kind of transmission must be made |
| forward movement the propeller makes at each | | | | between the engine and propeller. Mostly used types |
| rotation; number of blades: normally 2 or 3 on RC | | | | are the rigid shaft , which demands 1 or more u-joints |
| boats, although there are special props for submarines | | | | to allow for the inclined angle from the engine to the |
| with 5 or more blades; shaft diameter: The most | | | | propeller shaft, parallel to the bottom of the hull. This |
| common sizes are 3/16 (.187") and 1/4 (.250"). Besides | | | | kind of transmission is normally limited to electric boats |
| that, we must take in considerations whether the prop | | | | or glow engines with low HP. and comes with kits for |
| will be used in a surface drive configuration wherever | | | | assembling this kind of boats. For engines with higher |
| the prop will be used at the surface - a situation where | | | | HP and for gas engines, the transmission is via a |
| half prop is under water and half out of water - or | | | | flexible cable that looks like the speedometer cable of |
| subsurface, in which the whole prop is under water. | | | | your car, but much more larger and stronger. This "flex |
| The first type - surface drive - gives better | | | | shaft" runs through, and is supported by a brass tube |
| performance and for that reason is used on boats | | | | with or without a teflon liner. This tube can be bent to |
| where performance is the prime requirement.. Because | | | | create the correct angle from the engine and become |
| of the vast variety of types, sizes, dimensions and | | | | parallel to the bottom of the boat, linking to the prop |
| materials of props commercially available please | | | | axle. One of the tips of the flex cable links to the |
| contact Cast Your Anchor and talk to our technicians. | | | | engine crankshaft by means of a special coupler |
| Except for sail boats, all boats need a system that | | | | screwed onto the engine crankshaft on one side and |
| transmits power from the engine to the propeller. On | | | | with a square hole on the other side in which fits the |
| outboards, this transmission is inside the engine and is | | | | flex cable. Once again please contact one of our |
| not visible. What you see is a cylinder, much like that of | | | | technicians at Cast Your Anchor to get the proper |
| an airplane motor, normally wrapped by a water | | | | specifications for your project. |
| jacket - although some of the more moderns engines | | | | |