Donnay Formula 100 Hexacore Unibody


Technical data sheet

The Formula 100 as tested weighs 300g and has a balance point of 320mm.

The test racquet was perfectly on-spec both in terms of weight and balance, which is not common for racquets on the market. In this case DONNAY is characterized by an attention to detail that is certainly appreciated by the customer. 

The stringbed, as said, is a classic 100 in2 (645cm2) with a balanced and well-shaped shape. on which we find excellent string spacing, in pure drive style, a consolidated 16×19 pattern with a progressive and very harmonic progression.

The beam distribution is 22mm for the head of the frame that thickens at 3-9 o’clock up to 26mm and then goes down to 24mm near the handle. A very classic “reverse hourglass” pattern for modern profiled racquets that share a flat center thickening to ensure good ball exit coupled with responsiveness and solidity.

Unstrung specsStrung specs
Head size100 sq. in.100 sq. in.
Profile22 mm / 26 mm / 24 mm22 mm / 26 mm / 24 mm
Dynamic Stiffness130-135Hz – 55DRA130-135Hz – 55DRA
Polar Index0.94 – 7.0/100.92

The data show that SwW Swingweight and SpW Spinweight values are not particularly high, which results in a significant maneuvrability coupled with an intermediate mass.

The stability returned by the TwW value is not very high (15kgcm2 strung).

The polarization value of the racquet is intermediate (0.94 7/10) as you’d expect from a racquet of this type that seeks maximum playability and maneuverability.

In terms of flexibility, the static stiffness figure scores 54 RA points unstrung down to 51.5RA strung, a very low value even if compared to the latest trends that lead to a progressive increase in flexibility values. With a strung racquet, the value of static stiffness drops even further, certainly by means of a very homogeneous distribution of masses that does not indicate particularly marked flexpoints but rather a widespread flexibility with a peak in the central zone and in this case at the stems and above the bridge attachment. 

The racquet head is very flexible, soft and sensitive, providing a great feeling at the expense of brute power, responsiveness, naughtiness and solidity; this should be reflected in an optimization of the performance of the backspin spin versus the upper topspin spin.

Vibrational analysis of the frame – Note the distribution of frequencies in the bottom and the cutoff of the mid-high frequencies.

The stringing pattern is very balanced, “classic” in the 16×19 spacing, excellent for this type of frame.

The central zone is thicker and widens in the upper and lower zone in a harmonious and progressive way. 

The analysis of the sweetspot shows the presence of maximum homogeneity of stiffness in the medium-low hoop with an appreciable increase in stiffness in the upper zone in favour of a high level of control.