The Winglet Loophole in MotoGP

02/16/2017 @ 12:54 pm, by David Emmett19 COMMENTS

Winglets may have been banned for 2017, but the drive for aerodynamics development continues. This time, however, winglet development will continue on the inside of the fairing, rather than the outside. The development ban applies solely to the exterior surface of the fairing, and not the interior. 

What this means in practice is that while the shape of the fairing must be homologated at Qatar, with one update allowed during the season, that only applies to the outer surface of the ducts, and not to the vanes (the small struts or winglets inside the ducts which control the airflow and can be used to alter downforce) inside those ducts.

Development of aerodynamic control surfaces will still be allowed, as long as the changes remain on the inside of the fairing.

An eagle-eyed reader at spotted the gap in the regulations. Section of the FIM Grand Prix Regulations reads as follows:

Only the external shape, excluding the windscreen, is defined in this regulation, so the following parts are not considered as part of the Aero Body: windscreen, cooling ducts, fairing supports, and any other parts inside the external profile of the bodywork.

When reached for comment by email, MotoGP Technical Director Danny Aldridge responded, “You are correct in the fact that I only control the external shape/profile of the fairing. Meaning, Yamaha can in theory change or adjust their inner supports as often as they wish. When the regulations were being discussed with the MSMA, this was one of the criteria that they requested in the wording of the regulations.”

The shape of Yamaha’s new fairing helped to give the game away. As you can see in the photo by Andrew Gosling below, Yamaha’s fairing consists of an outer duct fitted to the exterior of the fairing, with two supports or vanes on the inside.

Yamaha can alter the position, size, and shape of those supports to suit the characteristics of each different track, or as they learn more about the performance of their ducted vane fairing.

On Thursday, Suzuki and Aprilia also rolled out their new aerodynamic fairings. Both took a different approach to creating downforce and aerodynamic surfaces to Yamaha, as you can see in the photos shared on Twitter by WorldSBK commentator and Paddock Pass Podcast regular Steve English.

The solution selected by Suzuki most closely resembles the Yamaha design, though its placement is very different. Where Yamaha chose to put its duct on the upper part of the mid fairing, Suzuki have added it on the side of the nose.

Clearly visible in English’s excellent picture is the central strut or vane which will provide downforce. Suzuki are free to modify this vane as much as they like.

Aprilia’s solution is very different, consisting of an open aerodynamic duct either side of the nose. Downforce in this design is generated by the shape of the inner channel, and the shape of the outer duct. There does not seem to be as much room for internal modification of the duct as on the Suzuki or Yamaha. 

Aprilia’s design may also spark debate over what constitutes the outer surface of the fairing. The wording of the rules is ambiguous, though an initial reading of the rules suggests that the inner surface of the duct is not considered to be a part of the “external profile” of the fairing.

The wording of the new regulations also makes clear that the ban on winglets was only introduced on the grounds of safety. And in a sense, the rule makers were bound by this, as the Grand Prix Commission only has the right to ban a technology on safety grounds, if the manufacturers in the MSMA want to allow it.

By having enclosed, smooth surfaces on the outside of the new aerodynamic fairings, the manufacturers are complying with the rules on safety grounds, while continuing their development of aerodynamic fairings and exploring the effect of downforce on motorcycle dynamics.

Though many senior officials inside Dorna feared the cost explosion which will likely ensue from allowing aerodynamics, the genie is out of the bottle, and they have no grounds to ban it.

With Yamaha, Aprilia, and Suzuki having unveiled their aerodynamic solutions, we now await to see what Ducati, Honda and KTM will do.

Ducati has already hinted that they are keeping their aerodynamics under wraps until Qatar – either the test, or a private test before the race. Honda remains evasive, but is likely to also have some form of aerodynamic assistance before the start of the season.

Only KTM has shown no interesting in developing aerodynamics so far. But as this is their first year in MotoGP, the Austrian factory already has a massive list of areas its needs to work in first.

The good news for riders of road motorcycles is that the designs being tested in MotoGP are far more likely to make it onto road bikes than the previous generations of winglets.

Getting type approval for motorcycle fairings with internal aerodynamic devices is far easier than for fairings with external wings attached. How quickly this technology actually trickles down to street bikes remains to be seen.

Photos: Andrew Gosling & Steve English

This article was originally published on MotoMatters, and is republished here on Asphalt & Rubber with permission by the author.

  • proudAmerican702

    If nothing else, I think the ducts look better than the winglets.

  • Fidel Cash-Flow

    Great to see them still pushing for new advancements in aero

  • fzrider

    It’s all well and fine to create loop holes in racing rules to allow continued aero development. But dang it all, when I buy my next bike I want my wings on the outside, and I want them to be beautiful. (and functional if possible.)

  • motobyte

    It would be interesting to see if both internal and external aero could generate the even more usable down-force.

  • Alclab

    Really happy with how the ruling gave way to this new designs and approaches, rather than stopping aero development in it’s tracks. I believe as Mr. Emmet says, that this is far more likely to trickle down to street motorcycles.

    Can’t wait to see what Ducati unveils! (Also Honda, but I somehow feel that their implementation will be more toned-down)

  • MrDefo

    I could see this potentially trickling down to the production sportsbikes, but how many consumers not part of a major race team going to find benefit? At least TC and ABS have obvious benefits to all riders.

    I think at this point I wish Ducati would just let the cat out of the bag already. I don’t think that their aero is going to be so revolutionary as to give the other teams an advantage this close to race time.

  • Seriously, who doesn’t like seeing GP bikes evolve?

  • Jonathan

    Suzuki’s version looks ugly compared to the others, but the placement is more reasonable having the downforce applied closer to the nose of the bike.

  • Tyler Hammond

    still think the ban is ridiculous….I mean its a safety issue, OK?…but we are talking about 200+ HP bikes going 200+ MPH.(not the safest sport to begin with) benefits of winglets out way dangers. BTW im a 30 year aircraft mechanic.

  • Chocodog

    For sure, so long Mickey Mouse ears

  • Superlight

    Except the Suzuki…

  • Nicko55

    Safety issue? The winglets are for the sole purpose of faster lap times and nothing else. Your comment recalls memories of the engine size reduction from 990cc to 800cc for “safety reasons”. It resulted in higher corner speeds, and ironically, more risk for the riders…

  • Stickshift

    Protruding winglets were banned for ‘safety reasons’… At the Argentinian round last year they made contact with a rider, resulting in complaints.

    This year’s aero solutions are within the revised rules.

  • Stickshift

    The only limit to how much downforce the manufacture wants is the size of the wing and airfoil shape, balanced with how much extra drag it will create (reducing top speed).

  • Mitchel Durnell

    As you say, what is the benefit? Downforce helps reduce wheelie at race speeds, something that one should be no where close to on the street. I really hope this doesn’t come to street bikes… while better than the winglets, these ducts are still a little homely (the Aprilia is the best looking but that’s not saying much.)

  • MikeD


  • MikeD
  • Tyler Hammond

    No Im saying the ban on winglets was because of saftey issues. like another rider getting snagged on a wing in a turn

  • Ryan StJohn

    What benefit is a 200HP 1.0l engine to street riders? The bikes that will have these are obviously the bikes most likely to see a race track – is that not blindingly obvious? No, your Goldwing probably won’t ever sprout any downforce producing devices.