41
Cracker Box tuning tools
Strut: Depth
- Lower to loosen the boat, higher to wet the boat. Imagine that the prop wants to always
ride at the same depth in the water. If you lower the prop, you are lifting the boat out of the
water. The reverse is true for raising the strut; it lowers the boat in the water.
Strut: Angle
- Negative to push the bow down, positive to push the stern down.
This is a course ride angle adjustment. Small changes in the strut angle make large changes
in ride attitude.
Trim Tabs:
Inner- Use these for fine adjustment of the ride attitude.
Outer- use these for fine adjustments to turns, as well as to control torque and prop walk.
Use of a very sharp prop helps eliminate both.
Rudder: Trim-
Use this to make the boat go straight. The rudder should be parallel to the hull
centerline. Anything less will rob speed. If you have to trim left, it’s probably prop walk.
Rudder: angle-
Use this to control the nose in turns. Kicking the bottom of the rudder
Forward will cause the nose to rise in the turns. Kicking the bottom back will cause the
nose to drop in the turns. It only takes a little; 5 degrees either way would be too much for
most hulls.
Turn fin:
This is mounted to the right side of the transom, and 90 degrees to the bottom of the hull.
Make sure that there is never any fin area forward of the pivot bolt (kick it back slightly).
CG:
This is the longitudinal (fore and aft) balance of the hull. Monos are usually 30-35 percent of
the hull length, from the transom. This is the pivot point for turning. A forward CG keeps
the hull wetter, preventing blowovers. Limits absolute top speed due to drag.
An aft CG keeps the hull out of the water, and usually blows over with very high speed.
That’s why they call it a “balance” point…
Prop:
The prop is very important to speed, as well as overall handling of the boat.
You can (and should) experiment with many props, lifting and non lifting, to get the best
speed and handling from your boat. Always sharpen and balance your props! A sharp prop
helps reduce “prop walk”, and a balanced one usually stays together!
Содержание I-BOX
Страница 8: ...I B O X N B O X 6...
