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Dinghy Harness, under or over seat

MC
Marty Campanella
Wed, Apr 17, 2013 10:20 AM

Question  is whether anyone uses a dinghy harness that has a lift point
below the height of the  dinghy seat and whether it is stable.

Planning on getting a dinghy crane.  I currently use the mast and boom on my
Krogen 42 to raise the dinghy.  This has caused me to rethink my current
harness that I use for lifting the AB 3.2VS dinghy (10').  The 4 point
harness is designed to go above the seat on the dinghy and thus the lift
point (where the 4 lines meet in a ring)  is 41" above the dinghy floor.
This harness arrangement is relatively stable while lifting.  This 41" is
not a problem using the mast and boom as the connection point on the boom
(the block with the ropes) can be raised to accommodate the needed "lift"
for the dinghy to clear a 27"  rail.  I estimate the needed height of the
block to be the 41" for the harness, the 27" for the rail and possibly
another 3" for the dinghy hull, for a total of 71" .  Thus if I raise the
boom so that the block attached to the boom is at 80" I clear the rail
easily.

The standard height of the attachment point for the dinghy crane I am
considering is 65" and the dinghy would not clear the rail using the current
lifting harness.  If I switch to a lifting harness which would not go above
the dinghy seat the lift point where the four cables meet in a ring would
only be 8" above the dinghy floor.  Thus the 8", plus the 27" for the rail
and 3" for the dinghy hull would give a total of 38", well within the dinghy
cranes 65" standard height.

My only concern is whether a low lying dinghy harness with a lift point of
8" would be stable while lifting.  Has anyone used this arrangement for a
four point dinghy harness?

Marty Campanella

Bay Pelican KK42

Question is whether anyone uses a dinghy harness that has a lift point below the height of the dinghy seat and whether it is stable. Planning on getting a dinghy crane. I currently use the mast and boom on my Krogen 42 to raise the dinghy. This has caused me to rethink my current harness that I use for lifting the AB 3.2VS dinghy (10'). The 4 point harness is designed to go above the seat on the dinghy and thus the lift point (where the 4 lines meet in a ring) is 41" above the dinghy floor. This harness arrangement is relatively stable while lifting. This 41" is not a problem using the mast and boom as the connection point on the boom (the block with the ropes) can be raised to accommodate the needed "lift" for the dinghy to clear a 27" rail. I estimate the needed height of the block to be the 41" for the harness, the 27" for the rail and possibly another 3" for the dinghy hull, for a total of 71" . Thus if I raise the boom so that the block attached to the boom is at 80" I clear the rail easily. The standard height of the attachment point for the dinghy crane I am considering is 65" and the dinghy would not clear the rail using the current lifting harness. If I switch to a lifting harness which would not go above the dinghy seat the lift point where the four cables meet in a ring would only be 8" above the dinghy floor. Thus the 8", plus the 27" for the rail and 3" for the dinghy hull would give a total of 38", well within the dinghy cranes 65" standard height. My only concern is whether a low lying dinghy harness with a lift point of 8" would be stable while lifting. Has anyone used this arrangement for a four point dinghy harness? Marty Campanella Bay Pelican KK42
PB
Peter Bennett
Wed, Apr 17, 2013 3:41 PM

My concern with such a low lifting harness would be the increased
horizontal stress on the attachment points, and high stress on the
harness cables.

On 2013-04-17 3:20 AM, Marty Campanella wrote:

Question  is whether anyone uses a dinghy harness that has a lift point
below the height of the  dinghy seat and whether it is stable.

<snippage>

The standard height of the attachment point for the dinghy crane I am
considering is 65" and the dinghy would not clear the rail using the current
lifting harness.  If I switch to a lifting harness which would not go above
the dinghy seat the lift point where the four cables meet in a ring would
only be 8" above the dinghy floor.  Thus the 8", plus the 27" for the rail
and 3" for the dinghy hull would give a total of 38", well within the dinghy
cranes 65" standard height.

My only concern is whether a low lying dinghy harness with a lift point of
8" would be stable while lifting.  Has anyone used this arrangement for a
four point dinghy harness?

Marty Campanella

Bay Pelican KK42

--
Peter Bennett, VE7CEI    Vancouver, B.C., Canada
Vancouver Power Squadron: http://vpsboat.com

My concern with such a low lifting harness would be the increased horizontal stress on the attachment points, and high stress on the harness cables. On 2013-04-17 3:20 AM, Marty Campanella wrote: > Question is whether anyone uses a dinghy harness that has a lift point > below the height of the dinghy seat and whether it is stable. <snippage> > > The standard height of the attachment point for the dinghy crane I am > considering is 65" and the dinghy would not clear the rail using the current > lifting harness. If I switch to a lifting harness which would not go above > the dinghy seat the lift point where the four cables meet in a ring would > only be 8" above the dinghy floor. Thus the 8", plus the 27" for the rail > and 3" for the dinghy hull would give a total of 38", well within the dinghy > cranes 65" standard height. > > > > My only concern is whether a low lying dinghy harness with a lift point of > 8" would be stable while lifting. Has anyone used this arrangement for a > four point dinghy harness? > > > > Marty Campanella > > Bay Pelican KK42 -- Peter Bennett, VE7CEI Vancouver, B.C., Canada Vancouver Power Squadron: http://vpsboat.com