{"id":10551,"date":"2022-03-23T21:22:45","date_gmt":"2022-03-23T20:22:45","guid":{"rendered":"https:\/\/www.presticebdt.com\/?p=10551"},"modified":"2022-03-23T21:32:38","modified_gmt":"2022-03-23T20:32:38","slug":"what-is-porpoising-f1-explained-how-to-fix-it","status":"publish","type":"post","link":"https:\/\/www.presticebdt.com\/el\/what-is-porpoising-f1-explained-how-to-fix-it\/","title":{"rendered":"\u03a4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf Porpoising F1 \u0395\u03c0\u03b5\u03be\u03ae\u03b3\u03b7\u03c3\u03b7 - \u03a0\u03ce\u03c2 \u03bd\u03b1 \u03c4\u03bf \u03b4\u03b9\u03bf\u03c1\u03b8\u03ce\u03c3\u03b5\u03c4\u03b5"},"content":{"rendered":"

What is Porpoising F1 Explained<\/h1>\n

How F1 porposing works and how to fix it<\/h2>\n

From where does the porpoise term come from?<\/h3>\n

The term porpoise is not new in the aerospace industry. In fact, it is usually referred to the ‘boucing off’ that an aircraft undergoes when the pilot push hard to land the airplane. The plane\u2019s repeating bounce will continue a cycle over the runway until the pilot nose dive and crash land the airplane.<\/p>\n

\u0393\u03b9\u03b1\u03c4\u03af \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bc\u03b5 \u03c4\u03bf\u03bd \u03cc\u03c1\u03bf \u03b4\u03b5\u03bb\u03c6\u03af\u03bd\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b7 F1;<\/h3>\n

Porpoising aircraft is a situation that follows if the pilot fails to control an airplane bounce correctly. The word \u2018porpoising\u2019 is a comebak in F1, has the phenomena was well known in the ground effect cars of 40 year ago. <\/strong>For more detail about how F1 2022 ground effect works, read our related article HERE<\/a>.<\/p>\n

What is porpoising in F1?<\/h3>\n

In F1, purpoising is a violent bouncing on the suspension at high speeds<\/strong> is what the driver feels. The cause is an aerodynamic one, where either the leading edge of the floor, or perhaps the front wing, is pushed ever closer to the ground as the downforce acting upon it increases. The closer to the ground it gets, the more powerful the ground effect is, as the air rushes ever-faster through the shrinking gap.\"how-f1-porpoising-works-explained-aero\"<\/a><\/p>\n

\u03a0\u03ce\u03c2 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b5\u03af \u03c4\u03bf \u03c0\u03bf\u03c1\u03c0\u03cc\u03b6\u03b9\u03bd\u03b3\u03ba F1;<\/h3>\n

\u03a5\u03c0\u03ac\u03c1\u03c7\u03bf\u03c5\u03bd three main phases which may repeat in cycles if the system is not damped<\/strong>. The first phase which precedes porpoising, is when the aero-load is generated by the bottom (underbody) and by the wings in particular the front one. At this point, when the front wing comes too close to the ground for the maximum stall speed, it loses the generated load. Therefore, the front end of the car loses aero-load. Sequentially, the car begins to lift the front end, regaining the functionality of the front wing and at the underbody inlet, but losing the load in the center of the venturi channels.<\/span><\/p>\n

Why has the purpoise effect comeback to F1?<\/h3>\n

With much more underbody downforce, stiffer suspensions and stiffer tyres<\/strong> (so not as much cushioning effect) the problem of porpoising has returned with F1 2022 cars. None of the teams had seen this effect in simulation. In a wind tunnel, even the stiffest belt of the rolling road is more flexible than the track surface, and accurately modelling the dynamics of the springs and dampers in this situation is not really possible. In fact, the dynamics reported above, is not new in cars dynamics but this year is massively emphasized by the underbody Venturi channels characterization<\/strong>.<\/p>\n<\/div><\/section>\n

A more detailed explanation of F1 porpoising.<\/h3>\n

When a F1 car goes on track, the downforce tends to lower the car height even more. Initially this phenomenon is favorable, the downforce generated by the bottom increases, but as soon as the critical height of the stall is reached, the problems begin. As soon as the downforce produced collapses<\/strong>, the car raises from ground. When you increase the ride height, however, the bottom is no longer stalled and the downward aerodynamic force increases, making the car lower again. This creates an oscillating movement of the car along the transverse axis. A hysteresis cycle is obtained on the dowforce value<\/strong>, the machine starts to oscillate and porpoising is born<\/strong>.
\n<\/span><\/p>\n

Teams tend to find the peak of downforce.<\/h3>\n

As you may deduce from the graph below, the F1 teams tends to setup the car ride height where the peak of downforce is produced<\/strong>. However, as higlighted by the red box, a slight deviation from that position (which is function of geometrical characteristics like the ridhe height h, the speed v of the flow (and viscosity) and the general shape of the floor) causes a great change in downforce (Cl=lift coefficient, for more about aerodynamics coefficients, read our related article The most important aerodynamic coefficients for racing<\/a>)<\/p>\n

\"The-porpoise-f1-effect-explained-aerodynamics\"<\/a><\/p>\n<\/div><\/section>\n

How to fix the porpoising F1.<\/h3>\n

Which are the main countermeasures tha teams are starting to thinking about to reduce the porpoising (also referred as dolphin motion)? Of course, there are many things on which teams can work on.<\/p>\n