
Overdrive M4 _SLALOM BLASTING
The OverDrive focuses on maximum reaching speed with increased twist and less back-hand pressure. A lighter weight means improved handling characteristics.
A moderate width sleeve, 7 battens, and 3 cams provide draft stability through a huge wind range. Combined with a higher aspect ratio, the OverDrive M4 has impeccable handling characteristics; a lightweight feel, with softer flex.
Smaller sizes (5.5 and down) have 6 battens to increase flex and control for when conditions get extreme.
The OverDrive M4 benefits directly from advances made on the Mach4 development. Higher aspect ratios and increased leverage add to the efficiency. Flow aligned battens further improve aerodynamics. The resulting performance is explosive acceleration and big numbers on the GPS.
The OverDrive M4 can be run on either RDM masts or SDM masts.
KEY DIFFERENCES BETWEEN THE MACH4 AND OVERDRIVE M4
/ Sleeve width: 33% narrower than Mach4 for lower weight and less water retention.
/ Boom length: Approx. 10cm shorter on most sizes for less backhand pressure.
/ Lighter, softer feel

Overdrive M4 _SLALOM BLASTING
The OverDrive focuses on maximum reaching speed with increased twist and less back-hand pressure. A lighter weight means improved handling characteristics.
A moderate width sleeve, 7 battens, and 3 cams provide draft stability through a huge wind range. Combined with a higher aspect ratio, the OverDrive M3 has impeccable handling characteristics; a lightweight feel, with softer flex.
Smaller sizes (5.5 and down) have 6 battens to increase flex and control for when conditions get extreme.
The OverDrive M4 benefits directly from advances made on the Mach4 development. Higher aspect ratios and increased leverage add to the efficiency. Flow aligned battens further improve aerodynamics. The resulting performance is explosive acceleration and big numbers on the GPS.
The OverDrive M4 can be run on either RDM masts or SDM masts.
KEY DIFFERENCES BETWEEN THE MACH4 AND OVERDRIVE M4
/ Sleeve width: 33% narrower than Mach4 for lower weight and less water retention.
/ Boom length: Approx. 10cm shorter on most sizes for less backhand pressure.
/ Lighter, softer feel

6 batten configuration
Sizes 4,6 – 5,5

7 batten configuration
Sizes 6,2 – 9,4

022 OD M4 | Luff | Boom | Battens | Weight | Head | Recommended Mast | Mast alternative | Enigma Boom | Boom | Extension | CAM SETUP |
---|---|---|---|---|---|---|---|---|---|---|---|
4.6 | 381 | 164 | 6 | 3.65 | FIXED | RDM RED 370 | RDM BLUE/GORILLA 370 | Enigma 160 | METAL 160 | Triple X | 3x RDM cams |
5.0 | 402 | 167 | 6 | 3.85 | FIXED | APEX PRO 400 | APEX/ARC 400 | Enigma 160 | METAL 160 | RACE | 1xRDM(top cam)*, 2xSDM included. Option to change bottom 2 cams to RDM. |
5.5 | 416 | 178 | 6 | 4.0 | FIXED | APEX PRO 400 | APEX/ARC 400 | Enigma 160 | METAL 160 | RACE | 1xRDM(top cam)*, 2xSDM included. Option to change bottom 2 cams to RDM. |
6.2 | 433 | 186 | 7 | 4.4 | FIXED | APEX PRO 430 | APEX/ARC 430 | Enigma 160 | METAL 160 | RACE | 1xRDM(top cam)*, 2xSDM included. Option to change bottom 2 cams to RDM. |
7.0 | 461 | 189 | 7 | 4.65 | FIXED | APEX PRO 430 | APEX/ARC 430 | Enigma 180 | METAL 170 | RACE | 1xRDM(top cam)*, 2xSDM included. Option to change bottom 2 cams to RDM. |
7.8 | 489 | 200 | 7 | 4.9 | FIXED | APEX PRO 460 | APEX/ARC 460 | Enigma 180 | METAL 170 | RACE | 1xRDM(top cam)*, 2xSDM included. Option to change bottom 2 cams to RDM. |
8.6 | 512 | 208 | 7 | 5.2 | FIXED | APEX PRO 490 | APEX/ARC 490 | Enigma 190 | METAL 170 | RACE | 3x SDM |
9.4 | 520 | 218 | 7 | 5.4 | FIXED | APEX PRO 490 | APEX/ARC 490 | Enigma 190 | ALU RACE 190 | RACE | 3x SDM |
* RDM top cam also works for SDM masts |
TECHNOLOGY
KEY FEATURES
/ MONOFILM BODY
MAXIMUM STABILITY AND PERFORMANCE
/ KEVLAR X-PLY LUFF SLEEVE
MINIMAL VERTICAL STRETCH WITH HORIZONTAL ELASTICITY
HIGH PERFORMANCE STABILITY


SEAMLESS HEAD PANEL
This high abrasion area is made from only 1 panel and does not carry any exposed seams, preventing any potential weak point in this area. As a result, seam creep and seam-related failure have been eliminated.

LEADING EDGE
Tuned entry with a finer leading edge rotation for reduced drag.

OPTIMIZED AERODYNAMICS
By aligning the battens with the direction of airflow drag has been reduced. Clean panels with minimal seams further improve the aerodynamics.


DIRECT DRIVE TENSIONERS
The DDT 4 and DDT 5 tensioners directly connect the tube batten to the leech of the sail. This new design eliminates the heavy section of tube that is needed for the standard batten tensioner and being smaller, has superior aerodynamics. It is used on all lower tension battens in the OVERDRIVE M4 and the MACH4.

INCREASED MID-LEECH TWIST
The mid leech has been opened more to decrease drag. Fast and slippery.


OPTIONAL CLEW POSITIONS
POSITION 1:
This is the recommended setting and carries the adjustable outhaul fitting. It creates the perfect balance between a comfortable clew height and leech tension. This is the setting that Matteo Iachino and Tristan Algret will use for 99% of their PWA slalom races.
POSITION 2:
This setting is lower and further in. It softens the feel of the sail and may be more comfortable for smaller, lighter riders looking for more control in higher winds.

PERFORMANCE MONOFILM CONSTRUCTION
Monofilm Construction to maximise performance and minimize weight. Construction mimics the exact sail prototypes that were tested by our racers.

BOOM HEIGHT REFERENCE
Boom height gauge for ease of reference.


MODERATE SLEEVE WIDTH
Wide enough for performance, the OverDrive M2 sleeve is 30% narrower than the Mach2 for lower weight and less water retention.

3&4 ROLLER TACK PULLEY
Roller tack pulleys are matched to the sails downhaul requirements and aligned for friction free downhauling and threading ease. Rig your sails with the Severne Hardware Division extensions for function and simplicity.


RDM CAM CONVERSION
The RDM Cam is an aftermarket option that converts the larger Turbo's and OverDrive M4 for use on an RDM mast. This option increases the access to the sail as many speed converts may already have an RDM mast. Speed sailors may prefer the extra level of mast reliability that the RDM mast gives you.

AUTO-ADJUST FOOT
Previously we focused on drag reduction in the upper parts of the sail, but with the Mach 2 and OverDrive M2 even the foot sections have been analysed and refined. Less tension on the foot edge combined with more forward oriented shaping allows the foot to twist and auto-adjust.


SPIDERFIBRE
SpiderFibre on the leech of the sail massively increases the perimeter strength and inhibits vertical stretch between the sail panels.

ACCELERATED LEECH
Automating the dynamic twist has enabled us to remove the Reflex system. The lower leech twist is now pre-loaded to mimic the twist pattern induced by the Reflex batten under load. Significant advantages are simpler tuning, reduced weight, and increased durability.


SDM CAM V2.0
A redesigned SDM cam improves rotation, ease of rigging and allows minimal downhaul settings without risk of the cam popping off.

SEAMLESS FOOT CONSTRUCTION
A single panel in the foot area with hidden load patches and zero exposed stitching eliminates seam abrasion and seam creep in this high load area. Maximum durability and minimum weight.
SUPPORT
Download our Overdrive rigging guide by following this link.