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Auto-release Clamcleat

Clamcleat - $21.00 
QTY
Replacement Cam Kit - $4.68
QTY

*Click for info about cam replacement kit...

This exciting new cleat will release a line when a set load is exceeded. It's perfect for a hold down for pivoting rudders and leeboards! The cleat flips up to release the rope when a set load is exceeded. The SD002570 is easily re-set or adjusted for different release loads, even out on the water.

After fitting the SD002570, (see fitting instructions below) start with the load adjustment cam set to Minimum. Increase the release load in small steps to avoid damage to equipment. Our tests show that release loads can be varied between 25kg & 240kg (50lb & 520lb). Note that smaller or worn ropes release at higher loads than larger or new ropes. Instructions are included with each SD002570.

Technical Information

sailboats, marine, dinghy, rope, holding cleats

sailboats, marine, dinghy, rope, holding cleats
sailboats, marine, dinghy, rope, holding cleats
sailboats, marine, dinghy, rope, holding cleats 
sailboats, marine, dinghy, rope, holding cleats
4-6mm
3/16 - 1/4"
Aluminium + Acetal
A = 68 B = 36. C = 24mm
A = 2 5/8" B = 1 13/32" C = 7/8"
M4
1/8"
4.2mm
No. 8
31gm
1.1oz

Fitting Instructions

Fits onto a flat or curved surface

auto, release, cleat, transom, tiller, rudder, downhaul, rope

Use sandpaper to achieve a perfect fit on a curved surface.

auto, release, cleat, transom, tiller, rudder, downhaul, rope

Mounting positions

auto, release, cleat, transom, tiller, rudder, downhaul, rope
Allow room for the cleat to operate
auto, release, cleat, transom, tiller, rudder, downhaul, rope
auto, release, cleat, transom, tiller, rudder, downhaul, rope
can be mounted on any side of a tiller
auto, release, cleat, transom, tiller, rudder, downhaul, rope
When mounting in positions 2, 3 & 4 use an elastic band to hold the tail of the rope.
  auto, release, cleat, transom, tiller, rudder, downhaul, rope

Rope alignment

auto, release, cleat, transom, tiller, rudder, downhaul, rope
To aid rope alignment
use a fairlead

auto, release, cleat, transom, tiller, rudder, downhaul, rope

auto, release, cleat, transom, tiller, rudder, downhaul, rope

Setting the release load

auto, release, cleat, transom, tiller, rudder, downhaul, rope

1. Test Release load with "cam" at "minimum setting".
2. To increase release load use a screwdriver to rotate cam towards "maximum".

WARNING - To avoid damaging equipment, make small adjustments and test each increase. Tests show that release loads of 240kg (530lbs) are possible with the cam at "maximum" setting.

Smaller or worn ropes release at higher loads than larger or new ropes.

Cam Replacement Kit

  • This kit is for anyone who has lost or damaged their original cam or screw.


SD002570UG

 

Feedback:

From Dave Tolan - http://davesboat.blogspot.com/

Be careful with installing this little device. The angle of the line to the device massively impacts the release force required.

In the simple case of the cleat being flat on top of the centreboard, if the line angles up to the cleat the release load is significantly increased, if the line leads down to the cleat, it is significantly reduced.

Also, as they note on the packet, thinner lines -> higher release load.

It all makes sense if you draw out the forces acting on the pivot arm as vectors and resolve them into a force along the pivot arm, and a force perpendicular to the arm.

Trial and error is required, don't simply install and assume it works. See this post for more.