AirPod chez Good Year.avi

Tous les ans, le centre de recherche de GOODYEAR au Luxembourg organise pour ses collaborateurs (plusieurs milliers de personnes) et des officiels « l'Innovative Day ».

Cette année, le 15 Octobre, c'était MDI et l'AirPod (équipé pour cette occasion de pneus basse consommation étudiés par GOODYEAR) qui étaient les invités.

Une conférence de presse, organisée par GOODYEAR, devant la presse et la télévision luxembourgeoises a été suivie d'une série d'essais de l'AirPod par tous les journalistes présents.

Cyril Negre a ensuite planché devant un panel de plus de 300 ingénieurs et cadres supérieurs dont le directeur général du centre et expliqué à ces experts passionnés d'automobile la technologie MDI.

La journée s'est achevée sur un consensus général concernant la pertinence de notre technologie.

Category:

Autos & Vehicles

Tags:

• AirPod;
• MDI;
• Guy
• NEGRE;
• air
• comprimé;
• voiture;
• good
• year

[Topazman12]

Did the investors ask for their money back?

[etbadaboum]

@Charlieutube99 Drom where do you have this information? First time I'm hearing from a REAL range...

[fizzguts]

@Deddily "So, four times lighter = four times less energy to move" NOPE. You have confused acceleration with a steady state velocity. Newton's first law of motion. Weight change (and the actual weight of an airpod is more like 450kg) makes a MINOR change to rolling resistance. MDI's struggles with air motors & the current use of a pressure regulator to a single stage motor are explored in aircars dot tk, on the yahoo air car forum & MDI's current website ie "crosses a pressure reducer"

[Deddily]

@fizzguts Sorry, the car weighs 744 kg so it's 3.5 times heavier.

[Deddily]

@fizzguts So, four times lighter = four times less energy to move, right? Our 21km range increases to 84km. And that car only has four batteries, so we need 20% more range: 84*1.2= 100.8 km. As for your claim that the three stage engine is not used, please provide a link to prove your point. Otherwise I will assume the engine is working as designed and we can remove the 50% handicap you have imposed upon it, which brings us to 201.6 km, which is not far off MDI's claim of 220 km.

[Deddily]

@fizzguts The Airpod has 200L tanks=40MJ. You say the the usable power is 50%, which is disputable but we'll say 20 MJ. Lead acids can be discharged by 80%, so that's the equivalent of 20*1.2=24 MJ in lead acids. Using your 5 MJ per battery, this is the same as having about 5 batteries. Search for Yugo-greg - his car has 4 batteries, 5hp motor and a range of 21 km in a car that weighs at least 850 kg - that's an inneficient car that is more than 4 times as heavy as the Airpod.

[fizzguts]

@Deddily A car is volume limited so weight is not that relevant. All the EV conversions I've had the misfortune to be associated with run the batteries down to 20% or more to get any sort of range. Yes it stuffs the batteries, you don't burn gas, you burn batteries. Lithium has a much better discharge vs life but it's still not great looking solely at the $. MDI runs a pressure reg to a single stage engine as their three stage unit keep icing up. They tell lies non stop

[Deddily]

@fizzguts

Lead Acid battery: 0.14 MJ/kg, 0.36 MJ/L

Compressed air at 300 bar: 0.5 MJ/kg, 0.2 MJ/L

So, you're right, compressed air is a around half as efficient in volume. By weight, though, it compares very favorably.

Even assuming you are right and you only get 50% of that capacity, remember that you only have 50% of the lead acids, too (to get a decent amount of charge cycles). MDI claim to have developed a near isothermal efficiency engine - if that is true, then saying 50% is unfair.

[fizzguts]

@Deddily

If you are comparing a std 12L dive tank (2.0MJ) to car batteries. Volume is equivalent to 2 batteries (ie 5MJ) . The USABLE energy is half that again for air as the engine and pressure regulator wastes more than 50 % of the energy stored vs 90% for battery to electric motor. Oh dear how sad. As no one with a clue uses lead acids anymore a comparison with Lithium ion is correct and air is even more appalling on weight & volume.

[Deddily]

@fizzguts Sorry but your statement is incorrect. The energy density for lead acid and compressed air is about the same. I wasn't comparing to lithium ion, I was comparing to lead-acid, let's keep this on topic.