{"id":48895,"date":"2023-05-02T15:00:48","date_gmt":"2023-05-02T13:00:48","guid":{"rendered":"https:\/\/www.bikeradar.com\/?p=726592"},"modified":"2023-05-02T15:35:47","modified_gmt":"2023-05-02T13:35:47","slug":"pocs-procen-tt-helmet-uses-the-venturi-effect-to-reduce-drag-and-improve-cooling","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/cyclingplus\/rss_feed\/pocs-procen-tt-helmet-uses-the-venturi-effect-to-reduce-drag-and-improve-cooling\/","title":{"rendered":"POC\u2019s Procen TT helmet uses the Venturi effect to reduce drag and improve cooling"},"content":{"rendered":"

POC\u2019s latest aero lid is a Tempor and Cerebel mash-up <\/p>

By Simon von Bromley\n \t\t<\/p>

Published: Tuesday, 02 May 2023 at 12:00 am<\/p>

\n\n

POC has announced its latest time trial helmet, the Procen.<\/p>\n

Taking inspiration from POC\u2019s existing time trial helmets, the Cerebel Raceday<\/a> and Tempor<\/a> (which will remain in POC\u2019s range), the Procen combines them into a more conventional form than we\u2019re used to from the Swedish brand.<\/p>\n

POC says its objective for the Procen was to improve the cooling characteristics of the helmet, without giving up aerodynamic performance compared to the Tempor or Cerebel Raceday.<\/p>\n

The Venturi effect<\/h2>\n
\n
\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
POC says the three large ventilation holes on the front harness the Venturi effect to improve cooling and reduce drag.<\/span><\/figcaption> POC<\/i><\/span><\/div>\n

POC says it has used the Venturi effect \u2013 the reduction in pressure that occurs when a fluid (or the airflow, in this instance) passes through a choke point \u2013 to improve the Procen\u2019s cooling and aerodynamics.<\/p>\n

The three large vents on the front of the helmet enable air to flow through it, over the rider\u2019s head and out of the rear of the helmet, taking excess heat with it.<\/p>\n

\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
POC\u2019s CFD analysis shows how air flows through the Procen and out of the large hole at the tail.<\/span><\/figcaption> POC<\/i><\/span><\/div>\n

POC says the placement of these ventilation holes also serves an aerodynamic purpose.<\/p>\n

According to the brand, these holes are \u201cdesigned to drain the high-pressure zone at the front of the helmet\u201d. This reduces the build-up of \u201cstagnant air and additional air resistance\u201d that riders would otherwise need to overcome.<\/p>\n

\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
The vents are placed in a high-pressure zone (red) in order to help reduce drag.<\/span><\/figcaption> POC<\/i><\/span><\/div>\n

CFD modelled shape<\/h2>\n

As with the Tempor, Cerebel Raceday and recently launched Propel aero sunglasses<\/a>, the POC Procen was designed using CFD (Computational Fluid Dynamics) modelling and analysis.<\/p>\n

POC says it performed 3D scans of a number of athletes from its sponsored men\u2019s and women\u2019s WorldTour teams<\/a>, EF Education-EasyPost and EF Education-Tibco-SVB.<\/p>\n

\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
Magnus Cort of EF Education-EasyPost was 3D-scanned for use as a CFD model.<\/span><\/figcaption> POC<\/i><\/span><\/div>\n

These models were then used to optimise the Procen for a range of time trial positions<\/a>.<\/p>\n

The truncated trailing edge of the helmet is similar to that seen on the Kask Beluga.<\/p>\n

\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
One of POC\u2019s 3D rider scans in its CFD development tool.<\/span><\/figcaption> POC<\/i><\/span><\/div>\n

POC says it has been shaped to reduce turbulence and enable the airflow from the outer edge of the helmet to combine cleanly with that coming from inside of it.<\/p>\n

The Procen also uses a very subtly flared edge on the rear side edges, which POC says helps to direct airflow over the rider\u2019s shoulders.<\/p>\n

This shaping is much less radical than on the Tempor, though.<\/p>\n

\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
The Procen has a subtle flare along the trailing side edges.<\/span><\/figcaption> POC<\/i><\/span><\/div>\n

When asked \u201cwhich helmet is fastest?\u201d, POC said it would \u201cdepend on the rider\u201d and their position on the bike, but that it is \u201cextremely happy\u201d with the aerodynamic performance of the Procen.<\/p>\n

It also noted that getting the best out of the Tempor typically \u201crequires a precise body position and technique\u201d.<\/p>\n

\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
Zoe B\u00e4ckstedt of EF Education-TIBCO-SVB testing the POC Procen in the Silverstone Sports Engineering Hub wind tunnel.<\/span><\/figcaption> POC<\/i><\/span><\/div>\n

Indeed, when we reviewed the Tempor back in 2014<\/a>, it proved extremely fast in a wind tunnel and the real world.<\/p>\n

Our tester also found it to be very sensitive to changes in head position, however, making it tricky to recommend as an option for riders who couldn\u2019t optimise their bike fit around the helmet, or hold a consistent head position while racing.<\/p>\n

POC says the Procen takes knowledge gleaned from the Tempor (and Cerebel Raceday) but puts it in a package that\u2019s better ventilated and less sensitive to changes in head position.<\/p>\n

Adjustable visor, one size, no fluorescent orange<\/h2>\n
\n
\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
The POC Procen is available in \u2018Hydrogen White\u2019.<\/span><\/figcaption> POC<\/i><\/span><\/div>\n

The final trick up the Procen\u2019s sleeve is an adjustable, detachable visor.<\/p>\n

POC says the Clarity lens can be positioned to sit \u201caround 10mm\u201d away from the helmet to prevent fogging while a rider is waiting to start their race. It can then be quickly pressed into place just before starting.<\/p>\n

The POC Procen comes in a single, medium size (54 to 60cm), but includes different-sized pads to fine tune the fit.<\/p>\n

\"""\"<\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/source><\/picture><\/div>
The other colour choice is \u2018Uranium Black Matt\u2019. Sadly, POC\u2019s signature fluorescent orange isn\u2019t an option.<\/span><\/figcaption> POC<\/i><\/span><\/div>\n

It costs \u00a3350\/$400\/\u20ac400, and is available in \u2018Hydrogen White\u2019 or \u2018Uranium Black Matt\u2019.<\/p>\n

POC\u2019s signature fluorescent orange colourway<\/a> is not an option at launch, however.<\/p>\n

The helmet was given its race debut with EF Education-Tibco-SVB riders at La Vuelta Femenina on Monday, and will be available to purchase from September 2023.<\/p> <\/body><\/html>\n

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