pedestal steerer - L-36 Fleet

TRANSOM HUNG RACY & PINION
RACK AND P ON STEERERS
Designed for transom hung rudder, inboard rudder, double ended boats with d+---l"
board rudder, racing and cruising boats to about 40 feet, these steerers offer the
answer for those requiring a compact, powerful and sensitive wheel system for their
craft. Positive response provides the helmsman with complete feel of the rudder.The
transom hung models offer 1.6 turns of the wheel lock to lock in 70" and the inboard
models, 1.8 turns to lock in 80". Easeof installation is primary feature.Transom hung
rudder models attach directly to the rudder through a slot approximately 2"x 6" in
the transom. lnboard rudder models attach to the rudderpost or rudderpost extension
and are available for mounting either fore or aft of the rudderpost.The steerer frames
then bolt onto theaft deckorsuitable mounting surface. You need only build asimple
strong combination seat and cover for over the steerer. Rack and pinion steerers are
ruggedly constructed of bronzeand bronzealloys with 1" stainless steel wheel shaft
andhardware. ~hese materials were tested and proven for their extra wear resistance,
reliability, and will provide years of trouble free performance.
RACK AND PINION PLANNING
The Edson Rack and Pinion Steerers are made in four different configurations:
transom hung rudder steerers, two different types of inboard rudder steerers and a
I RUDDER THICKNESS CHART I rack and pinion steerer for double enders. These steerers mount 90" to the rudder
Size Rudderstock Weight Size Rudderstock Weight
Fig 341 (inches lcm I Ibs. I k Fig 342 inches cm
175 1-314 4.4 24
-- ,I
I I I , , . .
350 1 3-112 18.9 1 28 1 12.7 1 / 350 1 3.112 18.9 1 31 114.0
axis. ~or.boats with forward rakes, or extreme aft rakes on this axis, the steerers
are available with a shaft universal and an additional bearing. Shaft universals can
change wheel rakes to 30 degrees in either direction.
To allow the helmsman to steercomfortabl~, the top of the wheel should be located
about 32"180.2cm up from the cockpit sole. lnall cases keep the seat low enough so
the helmsman's feet are firmly planted on the cockpit floor or other brace. If they are
left dangling the circulation will be cut off and the position becomes uncomfortable.
~oatswith rudderposts located too low in the cockpit can use the Fig 782 rudderpost
extender and Fig 675 coupling to raise the steering assembly to the required
height.
Edson will be glad to assist in the selection of the correct rack and pinion for your
boat. Just send in the top and side view construction drawings of your boat or, if
these are not available, a simple sketch with dimensions and a photograph will
help.
SELECTION GUIDE '-L (
Rack and pinion steerers are in most cases straight forward. The variables a d
"A" or shaft length, rudderstock for transom-hung rudders, rudderpost size for inboard
rudders and wheet angle. Taking these one at a time.
1. The "A" or shaft dimension is the distance from the axis on which the rudder
. . . . . - - - turns to the aft face of the wheel hub. If you intend on buildina a helm seat over the
steerer, be sure to add 6 to 8 inches for ieg clearance between the forward edge of
the seat and the wheel. If there is any question, make the shaft a little long as it can
Built in
Helm Seat be made shorter on the job.
2. The width of the rudder or rudderstock dictates the size for transom hung rudder
steerers Fig 341 and Fig 342. If in doubt, get the next wider jaws as you can
always shim the sides of the casting. The jaws on the gear rack are drilled at the
time of installation.
3. The rudder post diameter determines the size of rack and pinion steerers for inboard
rudders. Refer to the size charts for Fig 343, 344, 346 and 347.
4. All models of rack and pinion steerers are available with shaft universals if you
want to raise or lower the wheel angle.
Fig 341 Transom Hung Rudder Steerer. This steerer attaches directly to the rudder
through a slot in the transom and the wheel is parallel to the Pintle Line. The "A"
dimension is standard at 21 inches or is available to suit.
Fig 342 Transom Hung Rudder Steerer. Complete with shaft universal and 1"
self-aligning bearing. This steerer is the same basic model as the Fig 341, but it in-
FIG 341 corporates a shaft universal. This pivots at a point of 14-112" forward of the Pintle
Line. The self-aligning bearing is placed forward of the universal as close to the
wheel as possible to keep the wheel with a solid feel. The shaft universal can
TRANSOM HUNGRUDDERSTEERERS change the shaft angle up to 30 degrees. The same steerer sizes apply to the 342 as
the 341.
6
lL 0 A 1 IL W L I SIX. In Ft L&
Ft -M Ft Inches
to 25 to 22 18 - 20 273 7
26 - 30
31 - 36
23 - 25
26 - 31
20 - 22
22 - 24
300
360
7%
9
2 29
2 7
ORDERING INFORMATION
When ordering a Rack and Pinion Steerer, please specify the Figure number,
size, type of boat and description. For inboard steerers. the rudder~ost diameter
and key size is necessary. Unless otherwise stated, the keyway hill be onquadrant
side. If the steerer is to be used with a tubular rudderpost please sd=, ),
vise and you will be supplied with a 318 inch pin, pilot drilled through the cap of thJ quadrant. Also advise the "A" or shaft length that best fits your installation. When
determining a wheel shaft length be sure tb include the thickness of the face of the
wheel box, space needed for an auto-pilot drive sprocket, or length required for a
Fig 783 Brake, (about 2-114"). Wheel shafts are 1 " stainless steel and are machined
to accept Edson Wheels with 1" bore by 2-318" bore length, with a 114" keyway. Inboard
Rudder Rack and Pinions are bored and keyed at the factory if the sizes are
specified. If not they will be supplied with a pilot bore.
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r 21
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The Rack Forward Steerers are for those boats with little or no
room aft of the rudderpost. There are two models, each having dis-
tinctive uses. These should be carefully evaluated.
RACK AND PINION STEERERS -
Fig 347 Forward Mounted Rack and Pinion Steerer. This steerer
attaches directly to the rudderpost and the wheel is parallel to the
rudder~ost. The "A" on the shaft dimension is standard at 21" or is available
to suit. See chart below for steerer sizes.
w-
Rack and Pinion
Fig 346 Forward Mount Rack and Pinion Steerer complete with shaft
universal and a 1" Self-Aligning Bearing. This steerer is the same basic
model as the Fig. 347, but it incorporates a shaft universal. This pivots
at a point 141/z1' forward of the rudderpost. The self-aligning bearing is
FIG 346
wlUniversal
INSTALLATION INSTRUCTIONS
Attach the rack to the rudder or rudderpost at a 90" angle. Align the
steerer housing on the rack and check to make sure the height and
angle of the wheel shaft are correct. Securely bolt the housing in place
on the aft deck or mounting platform. Make sure this surface has suffiient
strength as it must absorb all of the steering loads. If required,
einforce it. Stops, such as wooden blocks shown to the right, should
-?.
now be installed on both sides of the steerer to limit its travel to the
lnboard Rack and Pinion
With Proper I?udder Stops
and Auto-Pilot
Provision for Removable
Emergency Tiller
desired arc. The box over the steerer should be waterproof yet. readily
removable. If you intend this box to double as a helmsman seat, be sure
to build it high enough to allow good visibility over the cabin top. Pro- Note: All screws and bolts should be tight, and should be
visions for emergency steering should be made by fitting a removable checked regularly to insure that they remain tight.
tiller on top of the rudder post.
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