RDM mast for freeride and progression
Loftsails Spark IV C50 RDM is designed for recreational windsurfers looking for a durable mast with good response and predictable performance. It is suitable for freeride, regular sessions, and developing skills on the water.
The 50% carbon construction provides better reflex and a more direct rig response than entry-level masts with a lower carbon content. At the same time, it retains the durability needed for frequent use. This makes the Spark IV C50 a practical choice for progressing riders as well as more experienced windsurfers who value reliability and a good balance between performance and price.
50% T700 carbon construction
The mast is made with 50% T700 carbon fibre. This carbon content provides a balanced combination of response, weight, and resistance to the loads generated during regular windsurfing.
Compared with high-performance 100% carbon masts, the Spark IV has a slightly softer and more robust construction. It still provides sufficiently quick reflex to support efficient acceleration, easy sail handling, and stable power delivery during freeride sessions.
Pre-preg technology
Loftsails uses pre-preg technology, where the fibres are pre-impregnated with a precisely controlled amount of resin before the mast is formed.
This method allows for a more uniform laminate compared with traditional wet lay-up construction. It helps maintain consistent material distribution, repeatable bend characteristics, and good durability without unnecessary excess resin.
Constant Curve bend profile
Loftsails Spark IV C50 RDM features a Constant Curve bend characteristic. The base bend value is 64%, while the top is 76%. This profile is designed for compatible Loftsails sails and other windsurf sails requiring a similar bend curve.
The correct mast bend helps maintain the intended sail draft, proper leech opening, and full tuning range. Each mast is checked and controlled during production to ensure consistent performance between individual units.
Durable and easy-handling RDM construction
The reduced RDM diameter makes the mast easier to grip during waterstarts and maneuvers. Its relatively thick walls also improve resistance to point impacts and loads associated with regular use.
The construction provides controlled and forgiving rig behavior, helping the sail remain manageable in gusty and variable conditions. It is a suitable option for riders who prefer predictable power delivery over the sharper response of high-carbon race-oriented masts.
Mast bag included
The mast comes with a protective bag, making storage and transport easier.
Good balance of price and performance
Spark IV C50 uses construction solutions also found in more advanced Loftsails masts while remaining available at a lower price point. The combination of T700 carbon fibre, pre-preg technology, and individual quality control makes it more than a basic beginner mast.
It is a practical choice for riders looking to improve sail response without moving to a lighter and more expensive high-carbon mast.
Who is it for?
Loftsails Spark IV C50 RDM is suitable for beginner and intermediate windsurfers progressing toward freeride sailing. It also works well for recreational riders looking for a solid mast for regular sessions, travel, and varied conditions.
Before purchasing, check the sail manufacturer's recommended mast length, diameter, IMCS stiffness, and bend curve.
Features
Loftsails mast manufacturing standards
Loftsails masts are manufactured using only the highest-grade materials and pre-preg (fiber cloth that’s pre-impregnated with resin) construction methods that are highly consistent for quality control and superior to traditional ‘wet’ layup processes that do no guarantee even resin transfer, strength and performance. Loftsails use superior T800 & T700 carbon fiber in their masts. T800 is the optimum fiber when under strain and elongation and compression and also delivers superior response action that enhances sails so well. T700 has even more superior resin absorption and consistency and in fact Loftsails leading Team Edition masts use both fabrics for the ultimate blend of quality and performance.
Accurate materials specifaction
The CAD plotter accurately cuts all composite raw materials used in the process. This is vital for consistency of weight control and performance.
Taking shape mandrels
The right mandrel for each model is then chosen so that the required taper, thickness, bend curve and many other characteristics specified for each model can be produced.
Layup and dressing
For confidentiality reasons we cannot show Loftsails’ precise, classified techniques used in the next stages. These steps involve rolling the plotted composite materials onto the mandrel with a closely guarded process on how the unique inner and compression layups are formed and secretive method for how the ferrules are integrated. The stickers are applied at this stage though!
Taping
External finishing such as protective basalt layers and durable finishing tape are applied to protect from camber wear, heat and impact.
Curing
The mast is cooked in an autoclave. It’s vital to closely monitor and precisely control the curation process at various stages for the most consistent results.
QC
Quality Control checks are made such as bend curve measurement, strength under load and impact. Final finishing inspections are then completed before packaging. Next stop – the beach!
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