Reverie Universal Fit Motorsport 225mm Chord Rear Wing Data

Designed for ReVerie by aerodynamics writer and designer Simon McBeath (author of Competition Car Aerodynamics) using Flowizard-CFD software. Data and images generated by the CFD software are displayed below. The wing profile was designed to give a range of downforce levels from moderate to reasonably high, depending on the deployed angle of attack and chosen span, at modest chord.

On single element 225mm & 150 mm wings the end plate ‘notch’ was incorporated to increase the wing’s efficiency by beneficially modifying the airflow around the wing tips’.

SPECIFICATION

Two universal fit designs are available. A straight design & a curved design with a 1600mm radius (chosen to suit Lotus Elise type models).

The wings feature internal longitudinal stringers and end spars with 2x M6 threaded inserts, for mounting between supports or for affixing end plates.

The wings come ready to mount, either between supports on the end spars, or underside mounted (double or single shear) using the supplied carbon fibre support tabs (to be bonded and riveted in the required position).

ORDERING INFORMATION

Specify straight or curved profile and required span width when ordering. The wing comes supplied with support tabs, rivets and adhesive for post or pillar mounting. Alternatively the end plates can be removed & the wing mounted between wing uprights. Also specify any special end-mount fixing details when ordering.

You may also like to order the optional 5mm or 10mm high gurney flaps. These can improve the lift / drag performance and reduce the onset of stall at higher angles of attack. These can be bonded on with adhesive or in some cases a high strength double-sided tape with suitable surface preparation. These can be purchased at a later date if required. Replacement end plates are also available separately.

RESULTS

Forces on Wing at Different Angles & Spans
Single Element
Calculated forces at different spans and angles, taking into account efficiencies at different spans
Air speed 44.7m/s (100mph) freestream

Effect of Endplates on 225mm Single Element Rear Wing Forces

Single Element
Runs at AoA = 16°
Wingspan = 1800mm
Air Speed = 44.7m/s (100mph)

Tuning Advice

The maximum angle of attack with this wing in free-stream air is 16°, although this may be different when mounted on a car. However, quite substantial downforce at greater efficiency levels (L/D) is given at more modest angles of 4° and 8°.

Forces increase with span width, as per tables above. The rises in the forces at speed are in line with the square of the velocity increase. Therefore, to calculate forces at different speeds within the range bracketed here, simply multiply by the square of the ratio of the speeds in question. Below 100mph some caution should be used when applying this square law, but approximations of forces down to around 60mph or 70mph will be valid.

To Scale a force to a different speed.
We will use the Notched end plate design figure at 100MPH from above. Then scale it to 150MPH.

New Force (N) = Original Force (N) x (New Speed² (MPH) ÷ Data Speed² (MPH))
New Force = 937.2 x ((150 x 150) ÷ (100 x 100))
New Force = 937.2 x 2.25
New Force = 2108.7

A 5mm Gurney appears to add an efficient increment of downforce, as expected. As a guide the 1800mm span wing with a Gurney at 12° produces similar downforce and less drag than it does at 16° without a Gurney. Thus, as a general rule, it may be valid to assume that it is better to use a small Gurney and keep to 12° as a maximum working angle.

All the results obtained were from evaluations in free-stream air, with horizontal onset flow to the wing. This is obviously not representative of the onset flow on the back of a car. Nevertheless, the generic findings of this project should be valid.