I like the internal 3 point lifting harness arrangement for all the reasons mentioned by David. For any unfamiliar with the arrangement – the two front slings attach to the eyes either side of the main bulkhead and the longer third sling providing stability attaches to the eye on the keelson in the aft cabin. When planning to make a harness for Elle (A169) had initially planned to make a chain harness and Richard who uses this arrangement for launching / recovering A89 gave me the specification. My intention was to keep the harness on board, so for weight and convenience eventually opted for webbing slings. The supplier advised on technical specification required for the intended purpose. Each sling is rated a 2 tons, so comfortably over-engineered; heavy-duty lifting shackles complete the arrangement.
For any members interested…
The sizes and specification – T6973 – 3 slings
2T – 13FT 5″ WEBSLING x 1 (rear); 2T 10FT WEBSLINGS x 2 (front)
The supplier used was:
SECUREFIX DIRECT LTD PO BOX 6839, DUDLEY, DY1 9JJ TEAM@SECUREFIXDIRECT.COM http://WWW.SECUREFIXDIRECT.COM