MotoGP aero rules to tighten in 2019?
MotoGP Technical Director Danny Aldridge is currently drafting a tighter set of fairing regulati𒈔ons for🎃 the 2019 season.
If passed by the Grand Prix Commission, the amendments w𓆉ill provide more precise guidelines about what is and isn’t allowed for the new generation of 'integrated winglets'.
Due to safety concerns,🐟 normal external wings were banned at the end of 2016, to be replaced by a regulation that specifie𝓰d:

MotoGP Technical Director Danny Aldridge is currently drafting a tighter set of fairing regulations for the 20🌠19 season.
If passed by the Grand Prix Commission, the amendments will provide more precise gu☂idelines about what is and isn’t allowed for the new generation of 'integrated winglets'.
Due to safety concerns, normal external wings were banned 🏅at the end of 2016, to be replaced by a regulation that specif🌸ied:
"Devices or shapes protruding from the fairing or bodywork and not integrated in the body streamlining (eg. wings, fins, bulges, etಌc.) that may provide an aerodynamic effect (eg. providing downforce💝, disrupting aerodynamic wake, etc.) are not allowed.
"The Techni𓆏cal Director will be the sole judge of whether a device or fairing design falls into the above definition."
Ever since, Aldridge has been at pains to point out that MotoGP doesn't want to 'ban downforce', only to make such wing devices safer (by being 'integrated') and control costs (by♚ limiting the number of fairing modifications through a homologation procedure).
One problem is that team🐻s have exploited another rule that states: "Material may be removed (eg. trimming, drilling of holes, etc.)... without affecting the homologation, b♎ut material may not be added."
This same rule, which allows for the drilling of holes to deal with crosswinds or additional cooling, o▨pens the door for teams 🍎to construct their fairings in a 'modular' fashion.
In other words, the fairing can be used in several configurations: With or without the winglet systems fitted and, in the case of Ducati, as a half or fu🌸ll sysꦬtem.
That means 'one' design effectively becomes three different fairings🌺, undoing the work to cont✱rol aerodynamic costs.
Thᩚᩚᩚᩚᩚᩚᩚᩚᩚ𒀱ᩚᩚᩚe changes sought for 2019 will clamp down on such 'modular' designs and also provide some specific measurements regarding the overall dimensions of the winglet systems.
While most teams have converged towards the Ducati-style design of a rectangular 'duct' on either side of the 𒊎fairing, Yamaha have gone a step further to create something more similar to the former wings, by morphing the duct concept into a kind of boomerang shape.
Among the current red lines for Aldridge are if the integrated wing systems extend in a forward⛦ direction, or if the outside horizonal surfa💦ce is curved upwards (wing style). Only the external fairing shape is defined by the regulations.
The 2017 Valencia Test fairing from Yamaha looked to breach those guidelines, but was modified just enoug🍸h for Sepang 2018. Until a clearer set of rules arrives, it appears the Yamaha design had to be passed as legal since the factory has cleverly mixed elements of other already-a⭕pproved designs.
To address such tactics, the 2019 rules are likely to specify the dimensions of a 'box' area on either side of the fairings, within which integrated wing sys🐻tems must be built, plus some radius ♏figures.
It is thought that most of the designs passed✅ since the start of last year would meet the tighter 2019 regulations, albeit without being used in the same 'modular' construction. The 2018 Yamaha fairing, however, mig🌄ht not fit within the post-2018 rules...

Peter has been in the paddock for 20 years and has seen Valentino Rossi come and go. He is at the forefront of the Suz𒈔uki exit story and Marc Marquez’s injury issues.