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only if the acceleration ('deceleration' if you prefer to not deal with negative values of acceleration) required (i.e. brake-pedal urgency) exceeds the traction available from the rear-wheels/motor. Actually, rear-wheel braking is in many ways better, as it aids line stability, reduces nosedive...

correct. But there are 'roos, wombats and quite a few other viscous creatures jumping out at you.

Holy sh!t. I'm still engaged in what nearly amounts to open warfare here. In the time i've spent 'communicating' with various MG folk to no avail, i could have mined the ore, smelted, cast, rolled, tempered, cut (hacksaw), drilled, cleaned, polished, plated (in my own made-up chem bath) and...

May i ask where did you get your car (undertray) fixed, Otterks?

Agreed. But still poor engineering practice. Even cheap countersunk hex would cost just a couple of cents more; countersinking the plate holes another couple of cents; cheapness for the sake of it always costs...

Still a 'cheapest possible' bodge, though - they haven't even used mushroom-head bolts/screws: using 2-cent hex on an undertray is just...ughhh.

How'd it go, DaevM?

Yeah, same sort of obfuscating/derisive/aggressive/ ignorance-pleading crap I've had for two years now, but after another month of phone calls+ visit to the dealer, no further forward. The original sale point dealer has agreed to 'look at it', though, while denying knowledge of any fix. While...

tried to get my 2-yr (from day 1) bendy scoopy tray booked in today. Strewth, what a fight. Obfuscation, ignorance, unwillingness. 0/10 for post-sales customer service, SAIC MG. A very good vfm ev ruined by absolutely crap service. May i ask you good folk which dealers have provided this fix...

yep it's just physics: The air passing the underfloor tray is somewhat accelerated by the 'venturi' effect of the form passing over it (hence F1 racing teams using skirty ground-hugging car bodies - see Mercedes recent porpoising cars...), so the actual 'speed' of the air passing the body is...

Yeah; sorry, I was being sarcastic. Hydrogen is a wonderful solution but the tech is still very early in terms of maturity; most non-engineers don't fully understand Technology Readiness and System Readiness.

Well the H₂ Mirai is selling well. (Not, unsurprisingly). Honda were, with the 'e' (imo, I owned one for a year), well ahead of all the rest, except for the inexplicable and ill-considered decision to put a small battery in it; a classic example of board/gaffer hubris overruling customer demand...

My ford got driven through once, by a 44-ton lorry on a German autobahn.

Could you go easier on the "Waaayyyy back in '83... please, stevegus. A discreetly British 'a while ago' would feel nicer.

robertb nails it: cars aren't an 'asset' unless you are stupendously lucky and/or time your purchase with a fad-bubble just right. And Muffler's first post 'gets it' too. EV tech is changing remarkably quickly - perhaps aided by ever-more rapid/efficient science (benefiting from the accelerant...

P.s: why the concern over the dirty mark: it shows a very clearly defined air pressure bleed from inside the aerodynamic fairing (body) and is obviously a counterflow, indicating a significant drag increase, i.e. energy loss. An F1 aero's dude would be sacked for this; with our mass-cheap cars...

NMLGSAN, sorry to have missed the poll (obvs would have responded); have been a bit busy doing a re-roofing job (my house) and the whether hasn't exactly been user-friendly this summer. Anyway, seems many folk either don't have the problem, or don't care - a shame. The undertray bulge is very...

per tsedge. Perhaps also try to remind yourself (o.k, difficult on a very hot day) that (i) if 'soaked' (i.e. exposed for a long enough period at whatever temperature a thermometer might read) the battery will eventually reach that ambient temperature - if it's in the 45+ deg C region all...

ah, seems like someone's already addressed this... https://www.thenewaero.com/efficiency/

Yep, look much better. The rather obvious follow up questions are: 'how long before someone makes an actual aero-optimised alloy wheel (that looks good)', then 'is a cheap steel + plastic cover a better option anyway?' (Noting that the plastic covers currently widely used are not 'handed', so...