Please note that our propeller designs may change over the years. As a result, multiple versions of the same propeller may be in circulation at any given time.
Some of these design changes may not be noticeable. However, other changes are significant and are important due to safety reasons. We will do our best to notify the general public of any changes concerning safety.
In order to verify that you have the latest design, measure the hub thickness, and compare it to that found in the product listing on our website. The measured value should be within +/- 0.010 inches.
The 16x4W is an example of a propeller that was updated in the year 2006. Older versions, with a thinner hub, are still in circulation and should not be used. Blade failure may occur.
Please see other important notices on our Technical Support Advisories page.
