Optimum pitch near the hub can also be achieved by using prop
cuffs which Tracy
wound up adding. I consider prop cuffs essential for IVO props.
For new cowling designs a larger diameter spinner (19 inch) can
be used such as
found on the Nemesis Nxt. This blocks some of the less than optimum

pitch

area of the blades.

Paul Lamar

Paul, do you have any pictures or diagrams of what a prop cuff looks

like or

how they are attached?

Dave Leonard

Sure Dave. Here is a pictures I just took at OSH. Also some of Tracy's
cuffs. The loads are not very high so glue will probably work.

Paul Lamar

Hi all,

on the first photo it looks like the cuffs are also used as a air pump for
the intake - see the little "flaps" right over the intake cover,

Though it seems to run real good, Tracy's RV4 cowl looks like an Aviation
Variant of Frankenstein!!  :))

Thomas J.

 
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