Summary of the types of system

No

Type

Brand

Country of

Vane type

Power leverage

Bevel gear

Vessel size

n

origin

Servo power

Still in productio

1

vane only

Windpilot Nordsee

Ger

V

no

0

no

< 6m/20ft

no

2

vane only

QME

GB

H

no

0

no

< 7m/23ft

no

3

auxiliary

Windpilot Atlantik

Ger

V

no

0

no

< 10m/33ft

no

Windpilot Caribic 2/3/4

Ger

V

no

0

no

< 10m/33ft

no

4

auxiliary

Hydrovane

GB

H

no

0

no

< 15m/49ft

yes

rudder

Levanter

GB

H

no

0

no

< 12m/39ft

no

S

trim tab/ auxiliary rudder

RVG

USA

V

yes

< 25cm/10in

no

< 12m/39ft

no

6

trim tab/

Auto Helm

USA

H

yes

< 25cm/10in

no

< 12m/39ft

yes

auxiliary

BWS Taurus

NL

H

yes

< 20cm/8in

no

< 15m/49ft

yes

rudder

Mustafa

I

H

yes

< 20cm/8in

no

< 18m/60ft

yes

l

trim tab/

Hasler trim tab

GB

V

yes

< 50cm/20in

no

< 12m/39ft

no

main rudder

Windpilot Pacific trim tab

Ger

V

yes

< 50cm/20in

no

< 12m/39ft

no

s

trim tab/

Atlas

F

H

yes

< 50cm/20in

no

< 10m/33ft

no

main rudder

Auto-Steer

GB

H

yes

< 50cm/20in

no

< 12m/39ft

yes

Viking Roer

S

H

yes

< 50cm/20in

no

< 12m/39ft

no

9

trim tab/

Saye's Rig

USA

V

yes

< 100cm/39in

no

< 18m/60ft

yes

pendulum

Quartermaster

GB

V

yes

< 100cm/39in

no

< 10m/33ft

no

rudder

10

servo-

Hasler

GB

V

yes

< 150cm/59in

no

< 12m/39ft

no

pendulum

Schwingpilot

Ger

V

yes

< 50cm/20in

no

< 12m/39ft

no

rudder

Windpilot Pacific Mk I

Ger

V

yes

< 140cm/55in

yes

< 14m/46ft

no

11

servo-

Aries Standard

GB

H

yes

< 190cm/lSin

yes

< 18m/60ft

yes

pendulum

Aries Lift-Up

GB

H

yes

< 190cm/lSin

yes

< 18m/60ft

no

rudder

Aries

GB

H

yes

< 190cm/lSin

yes

< 18m/60ft

no

Circumnavigator

F

H

yes

< 140cm/55in

no

< 12m/39ft

no

Atoms

F

H

yes

< 140cm/55in

no

< 12m/39ft

no

Atlas

GB

H

yes

< 160cm/63in

yes

< 15m/49ft

yes

Auto-Steer

E

H

yes

< 139cm/51in

no

< 12m/39ft

yes

Bogassol

NL

H

yes

< 120-

no

< 12m/39ft

yes

Bouvaan

Can

H

yes

150cm/4l-59in

no

< 14m/46ft

yes

Cap Horn

NZ

H

yes

< 120-

yes

< 18m/60ft

yes

Fleming

USA

H

yes

150cm/4l-59in

yes

< 18m/60ft

yes

Monitor

F

H

yes

< 130-

no

< 10m/33ft

yes

Navik

F

H

yes

1l0cm/51-6lin

no

< 13m/43ft

no

Super Navik

S

H

yes

< 160cm/63in

no

< 18m/60ft

yes

Sailomat 601

NL

H

yes

< 140cm/SSin

yes

< 13m/43ft

no

Sirius

GB

H

yes

< 1l0cm/6lin

yes

< 15m/49ft

yes

Windtrakker

Ger

H

yes

< 140-

yes

< 09m/30ft

yes

Windpilot Pacific

Ger

H

yes

210cm/SS-S3in

yes

< 18m/60ft

yes

Light

< 1S0cm/S9in

Windpilot Pacific

< 140cm/55in

220cm/63-S6in

12

double rudder

Stayer/Sailomat

S

H

yes

< 130cm/S1in

no

< 12m/39ft

no

3040

Ger

H

yes

< 160-

yes

< 18m/60ft

yes

Windpilot Pacific

220cm/63-S6in

Plus

Power leverage = PL (see illustrations) This provides an indication of the steering force obtainable from a system. The longer the lever is, the greater the steering force and, therefore, the better the steering performance will be.

Servo power is generated by harnessing the force of the water flowing past the hull (boat speed)

Vessel size (see manufacturer's specifications) The actual capabilities of a system with respect to maximum vessel size are subject to certain limitations (point 1).

Remember: What is the use of a system that can steer a boat in only 60-70 per cent of likely conditions and gives up off the wind whenever the wind is very light or very strong?

V vane yaw damping This provided by limited rotational deflection of vane, maximum = angle of the deviation from course.

H vane yaw damping This is provided by a bevel gear linkage with 2:1 stepdown ratio; automatic, yaw damping, so oversteering is possible. Systems without perfect damping require more manual trim corrections from the crew.

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