AquaCraft Miss Vegas Deuce - Manual (Page 6)

6
TRIM ADJUSTMENTS FOR THE
MISS VEGAS DEUCE
Here are some of the important factors that affect the
performance of a hydroplane.
PROPELLERS
The FRP (Fiber-Reinforced Plastic) prop that comes with your
Miss Vegas Deuce is about the best overall prop for daily
running. If your prop has a ding or chip in a blade, you need
to replace it with a new one before you run the boat again.
If you want to step it up and try your hand at even more
performance, try a metal prop. AquaCraft makes a
36x55mm (AQUB9700) beryllium copper/titanium version
that will work very well on your Miss Vegas Deuce. Please
heed any warning labels that come with the prop. Take your
time sharpening and balancing the prop using a good prop
balancer (AQUB9575) and lots of elbow grease. Please
do not run any metal prop without fi rst sharpening and
balancing it. Failure to do so will not only slow the boat down
but possibly break driveline parts. Also note that the metal
props can place more load on your engine and driveline,
possibly shortening the life of your hardware.
ADJUSTING DEPTH AND ANGLE OF THE PROPELLER
Like any high performance car, airplane, or boat, optimal
outcomes in cornering and speed require “fi ne tuning” the
variables listed below.
Adjustment of prop depth and angle is accomplished by
loosening the 4 x 10mm cap head screw on the strut bracket.
Draw a line on the strut blade with a waterproof marker where
it meets the strut bracket. This will provide a reference point
when making adjustments. It is important to loosen the fl exible
drive cable from the engine coupler to prevent creating a bind
in the driveshaft at the rear of the strut housing.
The Miss Vegas Deuce is best suited for operation on calm
water. Wind creates waves which present challenges to
running a hydroplane. An increase in wind will create choppy
water conditions, allowing the possibility of “blowing” the boat
off when running into the wind.
With extensive testing, we at AquaCraft have found
setting the FRP Y535 prop depth at 27mm [1-1/16"]
below the transom provides optimum performance.
27mm [1-1/16"] is to the C/L (centerline) of the prop
shaft. Negative 1° to 2° prop thrust is also essential.
PROPELLER DEPTH
Prop depth set low
Prop depth set high
The depth of the prop is a key factor in establishing the ride
attitude of a hydroplane. Lowering the prop depth will raise
the back of the boat, resulting in a “bow down” ride attitude.
A “bow down” ride increases the amount of sponson whetted
surface pinning the boat on the water and reducing top end
speed. Raising the prop depth will lower the back of the boat,
creating a “bow up” ride attitude. A “bow up” condition may
increase speed but will decrease stability. This may cause
the boat to “blow over” (backward fl ip) or “spin out” in a turn.
PROPELLER ANGLE
Positive angle (prop angles up)
Negative angle (prop angles down)