PART NO. |
RUDDER SHAFT dia. |
BODY dia. "D" |
HEIGHT "H1" |
WEIGHT |
WORKING
LOAD (max) |
6GB060 - 6GB079
|
60 to 79 mm |
150 mm
|
300 mm |
1,3 kg |
4200 kg
|
6GB080 - 6GB104
|
80 to 104 mm |
170 mm
|
300 mm |
1,7 kg |
5600 kg
|
6GB104 - 6GB140
|
104 to 140 mm |
210 mm
|
300 mm |
2,5 kg |
7300 kg
|
| The applications for the 6GB000 series
bearing: |
| The 6GB000 series bearings
are specially designed for production yachts. This bearing type combines a
very simple installation with a very smooth operation under all
circumstances as the bearing will always be aligned to the rudder shaft. The
bearing housing is made of GRP (resin type PROSET 125) , allowing it to be
laminated directly into the hull. A rudder tube is not required as the
bearing housing is designed to extend above the boats waterline. It must be
sealed to the rudder shaft with a
gaiter. In the case of female moulded production boats the bearings
housing can be mounted into the hull mould before lamination and gel coating
begins. After gel coating the hull the peel-ply is removed from the
bearing's outer face and the hull is laminated as usual with the exception
that the hull laminate runs up the side of the bearing housing. This means
that the bearing is already installed in the hull upon de-moulding, thus
providing an integrated rudder support, and saving production time.
|
Installation of JEFA Marine composite bearings in
female moulded hulls:
- Secure the bearing-housing in it's place in
the hull. The bearing should be jigged in place firmly so that it won't
alter position when worked during lamination.
- With the peel ply intact, tape a bag over the
top of the bearing so as to cover the entire bearing neatly.
- Gel-coat the hull.
- Just prior to lamination, carefully remove the
bag and the peel ply from the bearing.
- Laminate the hull making sure that the
laminate runs up the side of the bearing in full thickness. It can be
tapered down over a 100 mm span beginning just above the self aligning
bearing in the bearing sleeve.
- There should always be a skin joint around the
bearing that is at least three times the bearing housings measurement in
diameter, and the laminate should have a minimum thickness of
1.5x(1.8+(LWL/1.8), this thickness is not including the foam ram mentioned
bellow.
- When laminating the hull the first 10% of the
prescribed laminate should be laid directly into the hull to bearing housing
joint. On top of this "outer skin" there should be a foam ramp or fillet
(minimum 200 kilo/m3 density), which encircles the bearing housing. The
remainder of the laminate runs up over the foam ramp.
- When the hull is de-moulded and the deck
bearing is ready for installation the bearing cassette can be inserted into
the two slots in the bearing housing and rotated into place.
Please remember that these guidelines represent
good practice, however all structural components of a sailing vessel should be
engineered by a qualified engineer for the actual case. JEFA MARINE takes no
responsibility for any structural failures which might result from the use of
these guidelines.
|
