Single block 40/29mm fiddle block | Master Windrider
Windrider is a series of ball-bearing blocks designed with competitive sailing in mind, but they also serve as an affordable option for the cruising sailor. The high-performance composite side plates are engineered to ensure optimal performance even under high loads. The blocks feature high weather resistance, which prevents them from failing under all types of sailing conditions and provides long-lasting durability.
APPLICATION AREA
The slide block is used in the mainsail system together with the slide and is suitable for, among others, the RS Aero.
- Mainsail system, slide
- Fits RS Aero
TECHNICAL SPECIFICATIONS
Material
- Sheave: self-lubricating acetal composite
- Ball bearings: self-lubricating acetal composite
- Side plates/frames: reinforced fiberglass-nylon composite with UV stabilization
- Shackle: Forged stainless steel of grade A4/AISI316
Dimensions and loads
| Sheave Ø (mm) | 40/29 |
| Max. line Ø (mm) | 10/8 |
| Weight (g) | 67 |
| Working load (kg) | 230 |
| Breaking load (kg) | 800 |
FREQUENTLY ASKED QUESTIONS (FAQ)
How do I choose the right size block?
Base your choice on the diameter of the line and the load the block will carry. 40/29 mm sheave: line up to 10/8 mm. The working load should always exceed the actual load.
What is the difference between working load and breaking load?
Working load is the load the block is intended to be used with continuously. The breaking load is the load at which the block will fail and should never be used as a design value.
Does the block need to be lubricated?
No, the sheave and ball bearings are made of self-lubricating acetal composite. It is recommended to rinse the block with fresh water after use in saltwater.