Introducing the eRook RK55z Driver, the first product line from a new brand from Japan, “King Love Queen.” The theme of the brand is inspired by Mid-Century Europe and the game of Chess.
“Rook” is a chess piece that is shaped like a castle where the movement is of a straight line. They translated the straight movement of the “Rook” into this driver design with an emphasis on a “straight flight.”
The face material for this driver is Ti-5N Titanium, which has a very fine grain structure and has properties against the propagation of cracks. The material is 113% higher in tensile strength, 125% higher in yield stress and 160% in elongation than the more popular 6-4 titanium which is used in many driver heads. eRook RK55z driver uses material that has a great potential for distance, as it is less prone to cracks or breakage even when the face is flexed significantly during impact.
The eRook RK55z has unique design considerations for producing more distance. The square face, which is easy to address at the target, and the shallow back profile, which gives the impression of launching the ball easily. The large “Inch Bulge & Roll” face profile minimizes distance loss on off-center hits.
The head design focuses on increasing strength in key areas on both the sole and crown in an effort to maximize the trampoline effect of the face to increase initial ball speed.
CG distribution was calculated to maximize the amplification effects at impact. The CG distance was made to be slightly longer to allow forgiveness on off-center hits. CG height was lowered by the careful and strategic design of the wall thickness which contributes to lowering the backspin. CG Depth was optimized for the head shape so that it provides a good balance of stability and distance performance as well as a strong trajectory.
Dozens of sound simulation analyses were performed to achieve a pleasing sound and feel at impact. In pursuit of the optimal head vibration frequency (which equates to impact sound and feel), the design of the ribs are the result of numerous iterations of trial and error. After many testing and validation by a number of professionals as well as top amateur players, they achieved optimal sound and feel.
Be on the lookout for more products in the near future from this exciting new brand. The RK55z is one of the hottest boutique drivers available on the JDM market today. We are proud to offer you these types of hot new products now directly from Japan.
eRook RK55z Driver Specification
|Head material||Body: Ti811 titanium alloy Stainless steel screw
|Head manufacturing method||Body: precision casting
Face: press working, laser marking
|Loft angle (degrees)||10.0 / 10.5 / 11.0|
|Rie angle (degrees)||60|
|Head volume (㎤)||455|
|Length (inch): Recommended||45.5-45.75|
|Face angle (degree)||S0.5|
|Face Progression (㎜)||18.5|
|Head weight (g)||195 ± 2g (standard 4g screw) sold separately 2g 6g 8g|
|Center of gravity distance (㎜)||42|
|Depth of center of gravity (㎜)||34|
|Center of gravity height 1 (㎜)||33|
|Center of gravity height 2 (㎜)||36|
|Center of gravity angle (degrees)||22|