# Classic question about the use of a Cantilever beam for designing vehicle structures

Good afternoon everyone! I know it’s been a while since the last post but I’ve been (and still am) very busy with all kind of simulations, tests and writing papers and my doctoral thesis. Hopefully, I’ll manage to write some more articles during the summer! I recently had a conversation with some senior engineers from a F1 team regarding Cantilever beams and some erroneous assumptions which are commonly made, so I wanted to discuss it with you! Hope you enjoy this brief post!

A few weeks ago, I had the chance to speak with three top F1 designers and we had a chat about a certain question regarding the use of the Cantilever beam as a tool to design some vehicle structural components. First of all, let’s remind what this type of configuration is. A Cantilever beam is a structure which is fully constrained at one end, having a vertical load applied at the other end of the beam to study the effect of bending, as illustrated in Fig. 1.

This type of structure is very useful when designing certain components, since they can be simplified to this well-known beam, reducing the number of variables and being able to define simpler design targets. The thing is that usually, in reality, the components usually have some part of its length reinforced (e.g. thicker walls), so two questions arise: why is this non-homogeneous beam common and where should that reinforcement be placed?We agreed that a lot of people answer very quickly that it should be placed at the free end of the beam, i.e. where the load is applied. According to these people, the reason for this is pretty obvious, since that end will suffer the greatest deflection (I will write another post soon where I derive this and discuss some ways to calculate it by hand!). Hence, if that region was reinforced, the deflection would be smaller and the structure would be better in terms of bending performance. But, is this true? Let’s have a thought.

# What is the aim of the front wing in a F1 car?

Have you ever wondered why Formula 1 cars have those extremely complex front wings? Some people may think that these structures are only there for producing downforce, but in reality their function goes beyond that. Do you want to find out more? Well, here’s your chance!

A few years ago I had the opportunity to meet Craig Scarborough during one of his pesentations about Formula 1 at Cranfield University (United Kingdom). For those who are not familiar with that name, Mr Scarborough is a well known expert in motorsport and, just so you know, he’s quite a celebrity on social media (Twitter, LinkedIn…), where he usually shares top quality information about racing and the engineering behind it.

Yesterday, I contacted him after watching his latest video for motorsport.com in which he discusses the function of a front wing with Willem Toet, one of the best aerdynamicist in the world. They use a 3D airflow animation in order to illustrate how the wing of the McLaren MCL-32 works. After asking for his approval, Mr Scarborough was kind enough to give me permission to share the video with the audience of Engineering Breakdown, so here it is! I hope you enjoy it!

(Please note that in order to watch the videos, you need to reproduce them on Youtube, following the instructions).

# Formula 1 interview: Dr Nicholas Brown

Let me introduce you to Dr Nicholas Brown, one of the Composite Design Engineers at McLaren Racing and former EngD at the University of Surrey. It was a real pleasure having a conversation with him at the McLaren Technology Centre (MTC) in Woking, UK. We covered different topics about what is like to work at the top level of automotive engineering, including some tips for getting where he is now! Enjoy it!

First of all, I’d like to say how grateful I am to have you here, since I know you are extremely busy at the moment. Thank you for your time and your kindness. And now, let’s get started. Can you tell us a bit about your background?

So I did my masters first in engineering at Loughborough University; that was Aeronautical Engineering. I spent five years up there and did a placement year as well. So my placement year was with an aerospace electronic sort of warfare defense company, but I was doing more of the support work reliability team and things like that, writing general reports… Didn’t really do anything fancy, so I came out of there not wanting to do that and not really wanting to go on a graduate scheme. Then I had a year just between jobs and then the EngD came up, so I chose to do the EngD that as you know is a great opportunity. And then towards the end of it I was looking for more job roles and one came up at McLaren Racing as a Design Engineer, which implied using my composites knowledge for a more applied role. There are research aspects as well, but it’s mainly applying my knowledge. That was about a year and a half ago and now I’m still here! It’s quite fun! It’s good to apply all the things you know. As I said we do research up there but it is completely different to the research I did as an EngD.

# McLaren Employee Motor Show 2016

Last Saturday, I had the opportunity to attend a special motor show organised by McLaren at the MTC (Woking, Surrey). The aim of this event was to collect money for charity purposes and there, not only the legendary Formula 1 cars could be seen, but also super cars and classic vehicles which were exhibited by McLaren employees.

First of all, let me start showing you the M7C, commonly known as the “Thursday car”. This was one of the first vehicles in which the company started studying aerodynamics. As a matter of fact you can see that there are two wings: one at the rear part and another one at the front. The explanation for having these two wings is easy: because of the height of the rear wing, the down force which was generated was so big that the front of the vehicle tended to take off and that gave rise to the need of another wing to combat that effect. The reason why this race automobile is known as the “Thursday car” is that it was introduced on a Thursday free practice in Monaco and it got banned for being too dangerous. Why? Well, basically because the front wing could act as a “guillotine” if an accident occurred.

McLaren M7C (source: my personal flickr account)