AdamR28

Nearly... Women drivers 20210101_124702_2.mp4

That'll be his way of trying to put you off, haha.

Knocked together a 2 person sledge last night. Fully expecting to die later

We've not heard much feedback on this recently to be honest, its worth a try. Although... why did they need bleeding to start with?

I think the nose gives it away

Bonus points for anyone who can name the riders!

Pretty much exactly this.

As above, its normal. Haven't heard anyone else mention it recently so assume people just get used to it.

Yeah those are just plain old bunny hops.

I hope you just gave him three quarters of it?

Well worth reading, in that case: https://www.waterstones.com/book/the-chimp-paradox/prof-steve-peters/9780091935580

Awesome stuff gents, look forward to the videos! In semi-related news, took my daily to a sprint event at Cadwell this weekend, which was brilliant fun. A different setup to normal - with 2 different layouts, cumulative scores for the 6 runs rather than 'best run counts', and penalties for hitting cones / falling off the track. A bit like a rally, really. Despite some much more potent and non-standard machinery, including one guy who considered his ITB'd-standalone-ECU'd-Ohlins-dampered-Enkei-RPF1-wheeled-bucketed-and-harnessed MX-5 to be 'standard', I ended up 4th (of 17) in 'Standard' class. The night runs using 90s Japanese candles were... 'interesting'. Not had the adrenaline shakes for a LONG time, but on Sunday that buzz was back Thanks a lot for your aero input Dave, great to have some known reliable info! I have a few bits and bobs to play with before my next track day now. From what I can gather Rowan, skirts are banned in F1 after issues with them sticking meant instant and huge drops in downforce at critical times. There are also strict rules regarding sizes / positions of other aero devices, so they have to use the wings to try and claw some of the gains back. Here's a good little video: From what I can gather there will be even stricter reductions in wing downforce for 2022, which will be balanced out by more allowance for ground effects - which will leave air coming off the back of the cars with reduced wake.

Well, the aerofoil thing flapped about like buggery so I ripped it off, and the steering wheel nearly fell off, but other than that... The aero works - surprisingly well. The car has natural understeer at low speeds (really obvious on the sighting laps), yet wants to swap ends at high speeds. It's also pretty fast in a straight line. It also appears my engine is a 2 stroke, as it burns oil and fuel in a 1:40 ratio. But who cares, it's a lot of fun! Upgrades planned: Mainly working the rear floor to sort the high speed balance. Found a great article (which I am guessing you had a hand in Dave? @monkeyseemonkeydo ) to help figure out the relevant geometries for a functional diffuser: https://www.racetechmag.com/2017/08/willem-toet-explains-motorsport-diffusers/ Obviously a car with marshmallow-like suspension is never going to have optimal aero, but if I can get the car balanced - even by reducing front downforce / adding some lift back in - that'll do nicely.

Nice solution! Do you have a link to the parts used?

And some stupid aero bits from this morning... By my reckoning, just this will be enough to improve the top speed of the car by 3mph!

I'd like to see this one. Not sure how to call it though, either way whoever goes in that car it'll be interesting!

Papers in the post Seriously though thanks for the heads up and link to that article, some good stuff on Speedhunters. I've not looked there before as I've not been bothered with making the car look like it crashed through a branch of Halfords, but will do going forward. The car is actually pretty much ready for the first outing now which is Saturday all being well, and I did vent out the bonnet just not as extreme as some solutions! The rad is left as standard but ducted in and out, so I'm hoping that will reduce drag a fair chunk. A few pics... Now pretty much bang on 750kg, which will do me. Gut feel is that I'm going to need a rear wing to balance things out, but we'll see... Maybe I'll try and go full McLaren Elva sometime No wind in the face at 70mph, apparently!

Nope! Appreciate it is confusing, but thousands of bikes prove it works...

Already seen that first hand. Borderline dangerous IMO. The video... felt forced. Normally his vids make me want to ride, this one made me dislike ebikes a bit more.

Yeah, you do flip it around - the removal tabs face the BB

Thanks for calling and emailing Pablo, glad we have it cleared up for you already.

I think that adaptor you have Leon is one that comes with BB7 brakes.

I reckon you could make a good 5% improvement, perhaps at the expense of aesthetics though - have a look at EcoModders forum for ideas!

Found another paper that agrees with the one Dave posted above, not the same results exactly but a general significant decrease in drag from fitting the tabs / deflectors / whatever: http://publications.lib.chalmers.se/records/fulltext/250512/250512.pdf (page 18 onwards). Note this study uses seemingly less wide tabs, and only fitted to the front. I think I'll shoot for about 40mm, spanning the width of the tyres, fitted front and rear. That brings me to another question... the wheel arch pressure plots in the paper above, after adding the wheel tabs, seem to suggest the pressure above the wing is much higher than below it. In which case, would running vents at the top of the wing have the opposite effect and allow air to enter the wheel arch area? Or would louvres / Gurneys sort this out? Appreciate it is a case by case basis but just thinking out loud... Rowan, I've seen some stuff on enclosed wheels / solid hub caps in my link above, plus this vid below. In short it can help drag but at the expense of brake cooling: