No, the lifting keel
design is simple and robust. On our 435, the keel
are adjusted hydraulically (on older and smaller Ovni's, this is done by haleyards). Huge advantage about the hydraulic system is the clever use of rupture disk's. This is a small brass plate that will burst in the event of a pressure rise (will happen in case of a grounding or if heavy floating debris is encountered). When this disc bursts, the pressure in the system is released and the affected component (keel or rudder) swings aft with no damage at all. The rupture disk's are replaced in less than a minute.
As to the other advantages; the ability to beach the boat is probably the most famous. The ability to reduce draught and navigate shallow waters is equally pleasing. Finally, we also use the position of the centerboard
to trim the boat under sail. It works great, and with the wind
on the aft quarter, raising the centerboard
increases speed by 0,5 - 1 knots + improves the rolling motion.
During our more than one year in the Med, we frequently encountered huge areas with tuna nets. Especialli during night time, it was wery difficult to get out of such area, and since strong steel
wires are used in the surface, these nets are a real danger
to boats. In our case, we lifted both keel and rudder
, making the bottom totally smooth, and the wires just sliding under our boat.
There are many other examples.
Regarding the "socalled poor avs"; don't let that pull you off. I'll gladly comment that in more details - should you desire.
Finally; given some happy familiar circumstances, our boat is now for sale
- advertised elsewhere.