Hull Dimensions
| 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 |
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.
Sailplan Dimensions
| 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* Dwg 12/59 | 30.75 | 13.00 | 200.00 | 36.00 | 10.50 | 189.00 |