The Harken Vang-Master is a rigid, pneumatic (air-spring) boom vang that both pulls the boom down to control leech tension and holds it up when the mainsail is dropped, replacing a mechanical coil spring with infinitely adjustable air pressure. It is built for cruisers and racers who want precise, friction-free vang control across a wide wind range on boats roughly 18 to 56 feet.
Harken Vang-Master at a glance
| Feature | Harken Vang-Master | Traditional spring vang |
|---|---|---|
| Support element | Pneumatic air spring (adjustable pressure) | Fixed mechanical coil spring |
| Adjustability | Infinitely adjustable to conditions | Rated for one spring force |
| Feel | Friction-free, no spring squeak or wear | Metal-on-metal friction and wear over time |
| Construction | Hardcoat-anodized 6061-T6 aluminum, stainless fittings | Steel spring, heavier assembly |
| Boat range | ~18 to 56 ft (multiple cylinder sizes) | Varies by model |
What is a Harken Vang-Master?
The Vang-Master is a rigid boom vang: a strut that runs from the base of the mast to the underside of the boom. Unlike a simple block-and-tackle vang, a rigid vang carries the weight of the boom, so you can drop the mainsail without a topping lift. The Harken Vang-Master uses a sealed pneumatic cylinder in place of the mechanical spring found in most rigid vangs, giving you an air spring you can tune to the boat and the day.
How does a pneumatic vang work?
Instead of a steel coil spring, the Vang-Master relies on compressed air inside a hardcoat-anodized 6061-T6 aluminum cylinder to push the boom up. Because you set the air pressure, you can dial in exactly how much lift the vang provides, matching it to sail trim and wind strength rather than living with a single fixed spring rate. The result is a friction-free action with none of the squeaking, binding, or fatigue associated with metal springs.
Why choose the Vang-Master over a spring vang?
The main advantages are precision and durability. Air pressure makes the vang infinitely adjustable, the aluminum construction keeps it lighter than most spring vangs, and threaded connections with stainless steel fittings resist corrosion for long service life. Installation is straightforward, with pre-drilled holes and minimal extra hardware.
Which Vang-Master size should I choose?
Harken offers the Vang-Master in a range of sizes to suit boats from roughly 18 to 56 feet, with several cylinder diameters that provide different lift capacities. Custom lengths are available on request for specific boat requirements. Match the model to your boom weight and boat length, and confirm the correct mast and boom fittings for your spar. If your boat is small enough that you do not need a rigid vang, a purchase-based block-and-tackle vang remains a simple, effective option.
Frequently asked questions
What does a boom vang do?
A boom vang controls the vertical angle of the boom, pulling it down to tension the mainsail leech and flatten the sail off the wind. A rigid vang like the Vang-Master also holds the boom up when the sail is lowered.
Do I still need a topping lift with a rigid vang?
No. Because the Vang-Master is a rigid strut that supports the boom, it removes the need for a separate topping lift, keeping the aft end of the boat cleaner and simpler.
What is the Vang-Master made of?
The body is hardcoat-anodized 6061-T6 aluminum with threaded connections and stainless steel fittings, making it lighter than most spring vangs while resisting corrosion.
What size boats does the Vang-Master fit?
Standard models cover boats from roughly 18 to 56 feet using multiple cylinder diameters, and custom lengths are available on request for specific requirements.
Is the Vang-Master hard to install?
No. It is designed for simple installation with pre-drilled holes and minimal hardware. Confirm you have the correct mast and boom fittings for your spar before ordering.