You are predictable with PBY as @SpaceEVDriver is to this kind of knowledge
Off-topic stuff…
- Thread starter SpaceEVDriver
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Oh my goodness. I knew you would have something else to post about that. That’s awesome.
Here’s another picture that’s a little better.
I just revert back to the early 90’s and the show In Living Color with the Fly girl dancers.Ha, or have we changed the name to FLY?
@SpaceEVDriver you have 20 minutes to decipher these or the scouts blow up. Tik tok Mr. wick, tik tok
The one with 1/2mv^2 + mgh +… = integral F_engine ds is the work-energy theorem for an ICE vehicle.
1/2 mv^2 is the kinetic energy
mgh is the gravitational potential energy
The integral of F_drag ds is the energy required to move the vehicle through air resistance over a distance (s).
The integral F_rolling ds is the energy required to overcome rolling resistance over a distance (s).
The integral F_engine ds is the useful work the engine can do (at the brake/crank shaft as seen in the previous equation I described).
One important takeaway is that while most people think energy cost goes as speed squared, it turns out that the integral of F_drag over a distance is speed cubed. So when air resistance matters (above about 35-45 mph), if you double your speed, it costs 2^3 = 8 times more energy to keep the vehicle pushing the air out of the way.
1/2 mv^2 is the kinetic energy
mgh is the gravitational potential energy
The integral of F_drag ds is the energy required to move the vehicle through air resistance over a distance (s).
The integral F_rolling ds is the energy required to overcome rolling resistance over a distance (s).
The integral F_engine ds is the useful work the engine can do (at the brake/crank shaft as seen in the previous equation I described).
One important takeaway is that while most people think energy cost goes as speed squared, it turns out that the integral of F_drag over a distance is speed cubed. So when air resistance matters (above about 35-45 mph), if you double your speed, it costs 2^3 = 8 times more energy to keep the vehicle pushing the air out of the way.
You just did that. Like off the top of your head!
This is the downforce equation that describes how to keep the vehicle touching the road instead of flying up and coming down hard because there’s no propeller.
I mean, I spent a lot of years in school and working on energy equations for my job(s).
Thank God you saved the Scouts. But what do I know-you could’ve made up half that stuff
This is the air-fuel mixture equivalence ratio that describes how well the fuel will burn based on the actual air-fuel mixing ratio before it’s injected into the combustion chamber compared with the ideal (stoichiometric) ratio.
The saga continues!!! So my son got one of those surveys dealers send after service and he explained the tire situation. Now the dealer wants him to bring the car in so they can put it on the lift and show him how the tires are bad. Something about an inner tire band being worn. I called our tire guy back. He said there’s one tire that’s more worn than the others on the inside of the tire but he said unless he’s noticing difficulty in the rain no reason to replace them. They are fine. We agree in 2500 miles we will bring it in to him for a rotation and for them to check them. I told my son up to but he doesn’t have to go back to the dealer for them to “show him the tires” but if he does I’m going with him. These tires only have 9400 miles on a 45,000 mile tire!!
Did they say which tire? It’s odd that it’s only one tire. This usually indicates an issue with the camber on the tire that’s wearing more or a possibly a worn part in the suspension. But there could be other reasons. It’s not the tires that are the issue, it is something else.
Whatever the cause, I would have your tire guy check the suspension and the camber as well as the alignment for all four corners when you bring it in.
The tire guy said that his car has some camber and that’s the way they are setup and they all do it. But he just keeps saying the wear that it has isn’t an issue yet.
Typically a right rear tire wears the fastest because that’s your pivot tire when merging into roads.
So if they have aggressive camber it is likely that that tire wearing faster than the others.
But if an inner band is down to the wear bar there is no undoing that and it would need to be replaced.
Guess if it gets rotated regularly it will help minimize. Pre marriage my wife had a 95 Mitsubishi eclipse and the front weight of the car was so heavy and there was a bit of camber. Tire guys told me if we/she got 3 years out of a set she’d be lucky, and she traveled for work so her car would sit for 2 to 3 weeks at a time so she was only putting 8K a year on the car
He’s rotated them every 3,000 miles and they only have 9,200 miles on them. I expect to get more than that out of a tire.
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