The Rid'Air team's opinion: " ... "
At maximum speed, the D4 has a drop rate advantage of +12 cm/s over the D3. In still air, this gain represents the total line height every minute! The difference is even greater in turbulence where the D4 transforms gusts into altitude in the manner of competition wings. The D4's top speed surpasses that of its predecessor by 3 km/h, putting it irreparably behind in accelerated flight.
Intuitive and effective angle-of-attack control, improved airfoil, and optimized internal structure make the Delta 4 a Cross machine with impressive glide in turbulence. Its structure, the strongest we've developed, keeps the integrity of the profile even in the heart of turbulence, avoiding performance losses associated with deformations along the chord.
New ACR System
The new Active Control Risers (ACR), inherited from the Mantra, allow direct control of the angle of attack without changing the profile camber, mếme in accelerated flight. By operating both the B's and C's, the ACR allows you to control the wing like a 2-line while maintaining the comfort of a 3-line architecture.
This wing is the most docile of all the Delta. It is able to withstand a high level of turbulence without closing, even in accelerated flight. In addition, its collapse behavior is the smoothest in the series. This achievement is the result of choices such as a relatively low aspect ratio, but also of technical know-how on the structure, the line architecture and an optimized wing twist. Numerous tests have shown that after a lateral collapse the wing is only slightly prone to spinning or surging, and that the reopening takes place without shock. The behavior after a frontal collapse is excellent with an immediate reopening. The Ozone Shark Nose profile, by pushing back the risk of spins and stalls, makes landing at the top or in steep terrain relatively easy for a wing of this performance level.
The handling feel is a definite improvement over the D3 and will give you immense pleasure in flight. The brake feel evolves linearly - precise in the first part and authoritative in the second. You can easily adjust the bank and place the wing in the thermal core. The structural cohesion of the wing, especially the chord ensures excellent roll and pitch coordination, providing an agile and fun feeling.
The Delta 4 is aimed at intermediate to advanced pilots who fly 70 to 100 hours per year and have already completed a FSS. Its ease of use and high level of passive safety make it accessible to pilots who want to move up a category. Experienced pilots who want to fly with a greater margin of safety will find great satisfaction in a wing whose Cross performance is at the top of its class.