Lecomble & Schmitt single rod hydraulic linear drives with integrated electrical by-pass. These are directly fitted on the quadrant. The overall compact design lets you install these on the floor, ceiling or bulkhead. Lecomble & Schmitt linear drives feature the best thrust/electrical consumption ratio on the market!
A separate reversible power pack which can be installed where ever you desire. The linear drive kits are delivered already assembled and bled, with 1.20m of flexible tube (other lengths available on request).
Please email or call us and we'd be happy to assist you in finding the perfect Lecomble & Schmitt Linear Autopilot drive for you. Or if you would like to figure out the actual rudder load on your own below are two ways to determine this, by using a formula or if your boat has a modern hull, by boat length.
For boats equipped with a mechanical steering (wire ropes, cables, rack and pinion), it will be necessary to determine the following:
– The rudder(s) torque
– The available voltage on board (12 VDC, 24 VDC, etc.)
For boats fitted with a rudder with speed not exceeding 25 knots, the torque (C) of the rudder or rudders will be calculated according to the formula and correction coefficients below:
C = S x [ (0.4 Lg) – Lc ] x V² x K
Coefficient Chart (70° is industry standard)
|Port to starboard||70°||K = 15.89|
|Port to starboard||80°||K = 17.80|
|Port to starboard||90°||K = 19.52|
Here's an example of how the formula works:
|For sailboats||C x 0.5|
|For boats fitted with several rudders (catamarans, trimarans, monohulls)||Multiply the calculated torque result by the number of rudders fitted on the boat|
|H = 1.2 m||Speed under sail = 12 knots|
|Lg = 0.7 m||Speed with motor = 8 knots|
|Lc = 0.18||S = 1.2 x 0.7 = 0.84 m2|
Torque under sail:
(0.84 x [(0.4 x 0.7) – 0.18] x 122 x 15.89) x 0.5 = 96.11 m.kg
Torque with motor:
0.84 x [(0.4 x 0,7) – 0.18] x 82 x 15.89 = 85.42 m.kg
|Selection of the linear drives:|
|Torque not exceeding 50 kpm:||Linear drive type 32ST16 NEWAVE|
|Torque not exceeding 100 kpm:||Linear drive type 40ST16 NEWAVE|
|Torque not exceeding 200 kpm:||Linear drive type 50ST20 NEWAVE|
In the above example, the calculated torque is 96.11 kpm. Therefore the correct selection will be a linear drive type 40ST16 NEWAVE.
Note: for sailing boats with a modern hull and balanced rudder, the selection can be made in function of the boat length as below:
|Boat Length||Linear Drive Type||12v Part#||24v Part#||Max. Torque|
|Length not exceeding 33 feet*||32ST16 NEWAVE*||2203063||2203064||Not exceeding 50 kpm|
|Length not exceeding 44 feet*||40ST16 NEWAVE*||2203066||2203067||Not exceeding 100 kpm|
|Length not exceeding 60 feet*||50ST20 NEWAVE*||2203068||2203069||Not exceeding 200 kpm|
For boats exceeding 60 feet please contact us for assistance.
*Data given as an approximation only
|Model||32ST16 NEWAVE||40ST16 NEWAVE||50ST20 NEWAVE|
|12v Part #||2203084||2203086||2203088|
|24v Part #||2203085||2203087||2203089|
|Max Thrust||617 lbs