Hull Dimensions in Feet and Inches as designed.
| Dimensions | GRP Twisters | Wooden Twisters |
|---|---|---|
| LOA | 28’ 3” | 27’ 8” |
| LWL | 21’ 6” | 21’ 0” |
| Beam | 8’ 1” | 8’ 1” |
| Draft | 5’ 0” | 5’ 3” |
| Displacement | 9968lbs | 9856lbs |
| Ballast | 4628lbs | 4032lbs |
Including the rudder the underwater area is approximately 19 square meters.
Sailplans and rigs
GRP and Composite Twister Sailplan Dwg No 59
The original sailplan was Drawing No 4/59. Modifications to this were at the request of Uphams who sometimes carried them out before informing Holman and Pye. Some yachts therefore had modified sailplans earlier than the date of the drawing!
The MkII sailplan was originally drawn for Silver Twister. This was Jack Holman of Uphams personal Twister. The mast height was increased by 1’ 0” and moved aft by 6” (This was Drawing No 11/59)
This rig was thought by Jack to over-canvas the boat so he modified it himself in 1967. A number of Twisters were built before H & P prepared the MkIIa sailplan incorporating these ideas in August 1971. This Drawing No 8/59 shows 1’ 0” off the mast and a shorter mainsail foot. The drawing is in the Technical Archive.
Sailplan Dimensions in Feet
| Using RORC | ‘p’ | ‘b’ | Area Mainsail | ‘I’ | ‘J’ | Area Foretriangle |
|---|---|---|---|---|---|---|
| Original Sailplan Dwg No 4/59 | 28.75 | 12.50 | 179.00 | 34.00 | 10.50 | 178.00 |
| MkII Sailplan Dwg No 11/59 | 28.58 | 11.71 | 167.00 | 35.00 | 11.00 | 192.00 |
| MkIIa Sailplan Dwg No 18/59 | 28.50 | 11.00 | 157.00 | 34.00 | 11.10 | 189.00 |
| MED RIG - taller mast Dwg 12/59 | 30.75 | 13.00 | 200.00 | 36.00 | 10.50 | 189.00 |
As a guide, please remember that all Twisters are different and some are more different than others, here are some dimensions of actual sails as supplied by the sailmaker or as measured by the Owner. Some measurements may be rounded.
| Half width | Luff | Leech | Foot | |
| Top down Furler for a Mark IIA Rig | 5,538 mm | 10,600 mm | 8,300 mm | 6,500 mm |
| 145% Genoa for Mark IIA Rig | 9,700 mm | 9,200 mm | 5,100 mm | |
| Spinnaker | 5,500 mm | 10,200 mm | 10,200 mm | 5,600 mm |
| Spinnaker Mark IIA Rig | 5,200 mm | 9,500 mm | 9,500 mm | 4,700 mm |
| Yankee - smaller 'Genoa' for easier handling. Mark IIA | 9,700 mm | 8,700 mm | 4,490 mm |
