Disclosed is a root airfoil of a wind turbine blade.

A counterweight (27) is mounted to an arm (25) extending from an inner end cuff (7) of each blade.

The root end insert is prepared in advance and mounted on a mounting plate.

A master block is removably mounted to the blade cuff fixture to simulate an ideal blade cuff such that the gauge may be zeroed thereon.

The propeller blades (10) have, between the blade end and the balde tip, a twist of 30° to 80°, especially 45° to 60°.

slight crushing at the blade foot during initial tightening,

The invention relates to a propeller blade (34) radially extending between a blade foot (38) and a blade head (36), and comprising a leading edge (40) and a trailing edge (42), in addition to an active surface and a passive surface.

The strengthener comprises a supporting part (30; 40) that strengthens the blade root portion and the supporting part comprises a supporting portion (31; 41) to temporarily support the blade.

The upper and lower halves (20', 20'') of the ovate loop tip (20) have a common origin or root at their point of attachment with the blade tip portion (16).

The root end insert is lowered onto the mould by use of the mounting plate and a lowering mechanism.

The connector assembly allows an efficient releasable connection of blade root (110) and hub in a wind turbine rotor.

A gas turbine rotor blade (2) and rotor disk (4) arrangement employs a coating (74) in order to seal the gap which normally exists between the bottom part of the blade root and the bottom part of the disk slot.

We also note, in the control chart resistance (above), the allowable deflection at the foot of the blade (yellow) is more important, because of the width of chords near the blade root.

The coating (74) may be applied to the blade root or to the disk itself on the bottom part of the disk slot.

The manufacturing method can improve production efficiency and product quality, and the service life of the blade root can be prolonged.