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Bimini Top
Measurement Form
There are three
basic mounting
methods for bimini
tops:
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 |
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|
Split Mount |
Single Mount |
Dog Leg |
These
different mounting
methods for bimini
tops vary enough to
accommodate most
sailboats.
To select the proper
mounting
arrangement, you
must know where the
center of the length
of the top is.
You
will need a tape
measure, pencil,
sheet of paper and
follow the diagram
and these easy steps
to obtain the
necessary
measurements for us
to build you a bimini top. It's
that simple!
Step 1: Hoist
the mainsail and
sheet it in to the
centerline of the
boat for the lowest
position of the
boom. Make sure the
gooseneck and down
haul are set
properly, and that
the topping lift is adjusted to
accommodate the set
of the mainsail.
Step 2:
Measure the height
from the cockpit
sole to the bottom
of the boom, or boom
bales whichever is lower.
Subtract 2 inches.
NOTE: On all these
measurements, allow
at least 2 inches of
clearance so the
bimini will not
chafe
against the
mainsheet, backstay,
or the boom.
Step 3:
Measure from the
backstay to the
mainsheet at the
final height in Step
2.
Subtract 4
inches.If the
mainsheet attaches
to the end of the
boom, the top may
have to be either forward or aft of
the mainsheet.
Step 4:
Calculate and mark
the halfway point of
the length on the
coaming.
This can be
done by laying one
tape measure fore
and aft, and another
tape measure
athwartship at the
center of the
halfway point.
Step 5: Check
for rotation
clearance on the
winch handle, with
it in the winch and
your hand gripping
the handle. To do
this, hold the tape
on the coaming
center mark (from
Step 4) and angle
aft or forward over
the top of the winch
handle to the area
where the top would
end at the height
(from Step 2)
fore
and aft.
(A)
If you
have winch handle
clearance, go to
Step 6.
(B) If you
don't have winch
handle clearance,
proceed with one of
the following:
1.
From the
center mark on the
coaming (from Step
4) measure past the
winch until you gain enough winch
handle
clearance and put a
mark. Measure the
same distance in the
opposite direction
and put another
mark.
These would be
mounting positions
for fore and aft
deck mounts.
Measure
the distance
(“split”) between
the fore and aft
mounting positions
and make note.
OR
2. The “Dog
Leg” mount. This
type of mounting is
used when the single
mount (center
mounting) is too low
or there isn't
enough room to allow
for a split mount.
The actual mounting
position is 4 to 8
inches off the
centerline
depending on the
height of the top.
(The radius in the
dog leg bend changes
from boat to boat in
order to accommodate
winches and winch
handle clearance.)
The lower the top is
from 45 inches high,
the more
the mount
moves off center.
This should be noted
for the direction of
the dog leg bend.
This arrangement
must be well
considered for
folding the top
down. The outside
radius of the bend
in the frame should
face aft if the top is to fold forward
and vice versa.
Step 6:
Measure athwartship
for mounting width.
If you come up with
a “split” mount in
Step 5 try to keep
the
width the same
fore and aft even if
one side mounts
inboard and the
other mounts
outboard on the coaming.
On center
cockpit boats it is
encouraged to use a
split mount,
especially if you
have a walk through.
In this case, the
forward mount should
be just forward of
the walk through and
as far outboard as
possible to maintain
the maximum desired
width and ease of
entry/exit.
On
center cockpit boats
without a walk
through, a single
mount top is
satisfactory but
should be
discouraged
if you
plan to add an
enclosure at a later
date. The “split”
would double as a
doorway,
thus making
entry/exit much
easier regardless of
which side of a dock
you tie up to.
Step 7:
Actual Height:
(A)
Single Mount or Dog
Leg Mount - Take the
height from the sole
to the boom, less 2
inches, and
subtract the
distance from the
sole to the top of
the cockpit seat and
the distance from
the seat
to the coaming at
the level of the
deck mount.
(B) Split
Mount - Same as Step
7 A, but take
measurements at the
forward and aft
mounts,
because the coaming may have a
rise which will make
one set of frames
taller than the
other.
FINAL NOTE:
The projection of
overhang in relation
to the deck mount to
the aft end of the
top and from the
deck mount to the
forward end of the
top should be the
same, or as close as
possible.
Example 1:
Single Mount Top -
80 inches long. Deck
mount in center with
40 inches aft of the
mount
and 40 inches
forward of the
mount. If not the
same, take
measurement from
center point of bimini to forward deck mount and from
center point of bimini to aft deck
mount.
Example 2:
Split Mount Top - 80
inches long, with a
24 inches split.
Overhang of 28
inches aft of the
aft mount, with a 24
inches split and a
overhang of 28
inches forward of
the forward mount.
NOTICE:
Please take special
note of the strap
lengths and include
them with your
bimini top
measurements. The
measurement is taken
3 inches inboard
from each leg bend
on the frames to a
point approximately
12 inches forward of
the forward end of
the bimini, and aft
of the aft end of
the bimini. You may
have to angle the
straps inboard
several inches to
get around any deck
hardware.
If you desire a
bimini, which has a
single or split
backstay through the
canvas, use the
following:
(schematic)
1. Follow
Step 2 (on page 1)
to determine the
height of the bimini
from the sole.
Mark
with masking tape on
the backstay at this
height. If you have
a split backstay,
mark both pieces.
The measurements we
need to locate the
backstays are:
(A)
The
distance from tape
to tape, and,
(B) The
centerline distance
from the stern
pulpit to a line
plumb from the tape
(providing the
stern pulpit is
where you want the
top to end).
2. For the
overall length on
aft cockpit boats,
follow Step 3 (on
page 1),
but measure
from the stern
pulpit instead of
the backstay.
Subtract 2 inches
from the forward end
instead of 4 inches
overall.
Fill in the form
below with your
preference of
stainless steel or
aluminum frames and
your choice of
fabric.
(Please
make sure the unit
of measurement is in
inches!)
SINGLE MOUNT:
Length:____________
Height:_________
Width:_________________
DOUBLE MOUNT:
Length:_________
Width (Fwd):______
Width
(Aft):______________
Height
(Fwd):______________Height
(Aft):____________ Split
(Aft):__________________
FABRIC:
Sunbrella®:___________________________________ Color:______________________________
Sunbrella® Color
Choices: Black,
Royal Blue, Pacific
Blue, Navy, White,
Grey or Forest
Green
Type of Frame:
____________1"
Stainless Steel
____________7/8"
Aluminum
PERSONAL
INFORMATION:
Name:_______________________________________________________________________________
Address:_____________________________________________________________________________
City:______________________________________________
State:____________ Zip:________________ Type of Boat:_________________________
email:___________________________________ Home
Phone:_______________________
Work
Phone:_______________________________
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