24
This UHMW “Leaf Spring” component provides increased strength and support to the flex
feeder at the lower end of the luff base extrusion. The transition from supported to unsup-
ported flex feeder has shown to be vulnerable to cracking when the feeder is allowed to flex
well beyond its design parameters. Testing has proven that operator error is required for this
over-flexing to occur, and is generally due to insufficient furling line tension during the hoist.
This lack of furling line tension can result in the sail ‘blowing out’ of the top of the boom which
results in unacceptable side loads on the flex feeder. Also, extreme vertical compression
loads can be exerted on the flex feeder in this situation when a batten pocket is forced to
make virtually a right-angle turn before entering the prefeeder. Therefore, it is critically impor-
tant that the restrictor line and termination blocks be installed properly (see Dia. 4 page 11).
An additional issue results from reefing with a batten on the flex feeder. Cyclical batten thrust
forces will cause the flex feeder to fracture.
ALWAYS REFF THE SAIL SO A BATTEN IS
ON THE FURLING MANDREL
. A batten in this location provides outhaul tension to the foot
of the reefed sail.
The leaf spring component dramatically softens the hard-point transition at the lower end of
the luff base extrusion. This addition does not negate the tailing requirement when operating
the Leisure Furl boom. It is always important to keep the sail be as vertical as possible
between the boom and the prefeeder when hoisting or furling.
Leisure furl
Leisure furl
Leisure furl
Leisure furl
Leisure furl
Flex Feeder Leaf Spring
DURING SEA TRIAL
Instruct the boom operator how to tail the furling ling when hoisting
and ensure the sail does not blow out of the top of the boom. Keep
the sail flat and as vertical as possible between the top of the boom
and the prefeeder during the hoist.
The leaf spring is securred
to the luff base extrusion by
two 10-24 FHMSs.
