Re: What prop??
racohoon, you may have to remove the prop to identify it. I've seen part numbers stamped into the hub on some models. When you look for a prop also notice your hub design and hub diameter.<br /><br />Props come in more materials. Aluminum, stainless, plastic, compounds etc. and ofcourse in various designs (blade area and shape, blade cupping, special uses) and number of blades. To help in choosing a prop you must decide on price, how you expect to use it (boat take off weight), if hitting anything under water is likely to happen (even sand banks) and also motor mount hight on transom.<br /><br />Stainless in most cases perform better but also cost more. They are so strong, that hitting obstickles under water normally won't hurt them - instead this stress hits the gear, shaft etc.<br /><br />Composite props are designed to make the best of all. Claim to perform better than aluminum and some of those use replaceable blades. Very often made in a way to use common parts for different props to keep production costs low.<br /><br />Aluminum is the standard thing. They too come in many types and offer good value. There is a very large number of props to choose from.<br /><br />In detecting your needs, a tachometer is important. The prop pitch should be the compromise, where you get WOT within the specified rpm range, fair accelleration and the highest possible top/cruise speed. If this mix cannot be acchieved, WOT rpm over the specified range will be OK - as long as you draw back on throttle to stay below the range maximum once up and planing.
