anyone ever experience brief blurred vision from acceleration?

[Gimme_my_MME]

Sometimes the best part of the internet is when you try to wrongly explain g forces to a pilot with a graduate degree in aerospace engineering and a decade spent as a flight test engineer on fighter aircraft.

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[moparguy]

It's a Mach E, not a Tesla Model S Plaid, however, if that really happened, I'd check a doctor immediately, hope all goes well.

 

[DYohn]

Could be a brain tumor. Or aliens. Have you checked for aliens?

FYI, when I was a relatively tall and relatively skinny 18-year old in the Midwest I drove a rail dragster in competition for a summer. Blurred vision sometimes from vibration, not acceleration, even though we were running speeds street cars can only dream about.

 

[RedStallion]

... and the acceleration was definitely more than 1g...

1g is impossible to get from Mach-E, very few cars can achieve that. Not even mentioning the tires on Mach-E are not being able to take 1g.

 

[jonkMACHE]

Sometimes the best part of the internet is when you try to wrongly explain g forces to a pilot with a graduate degree in aerospace engineering and a decade spent as a flight test engineer on fighter aircraft.

As a fellow engineer (with a tiny amount of hobby-level pilot experience, but admittedly very little real-world aircraft experience) I’m curious… you’re making the argument that flying in a straight line exerts less g-force than when you’re in a turn? That flies in the face (no pun intended!) of just about everything I ever learned about acceleration.

 

[BlackonBlack]

So, as a preface to this, I have done several wide-open-throttle pulls, and have never had an issue with the MachE's acceleration.

However, every once in a while, the motor dynamics and the car's initial conditions will be just right so that I get serious whiplash. I had one such experience the other day where I pressed the pedal in about 3/4 of the way during a 10mph rolling start... it whipped me back so hard that I lost vision for about half a second. Anyone else ever experienced this?

***edit*** changed the title to something a little less dramatic...

No whiplash but I had a friend beg me to slow down as he whimpered. Outstanding!

 

[jonkMACHE]

1g is impossible to get from Mach-E, very few cars can achieve that. Not even mentioning the tires on Mach-E are not being able to take 1g.

In a straight line, yes, 100% correct… but a hard pull after a sharp brake and a turn? It makes me wonder… or maybe I just really need to see a doctor

 

[CompilerBreak]

Jut curious, do you have the propulsion sound on or off? I tried it out off for a bit and had to turn it back on, my body did not like the quick and quiet acceleration, was making me feel a little motion sick, which could be along the lines of what you encountered.

 

[Volfan615]

I have felt a tiny bit of vertigo and stomach butterflies when I launch out in my GT on engaged! Did you know that our acceleration is actually is a bit faster than Disney California Adventure's Incredicoaster launch-out?

This is what I've felt. Kind of crazy until you eventually get use to it.

 

[RedStormREHS]

This is what I've felt. Kind of crazy until you eventually get use to it.

Ahhh, it still gets me queezy when I half-floor the electron pedal! I call it my very wicked car. Joking to people... I stress this darn thing has one main problem, "It go too fast!"

Edit... I've received only one citation in this car... I stupid parking ticket, ha!

 

[Pushrods&Capacitors]

lol I appreciate all the concern, but I'm as healthy as an ox. We are not talking about 5 seconds of blackout, I'm talking about a half a second where my vision started to go blurry... and the acceleration was definitely more than 1g... I know what 1g feels like and this was about double that.

The reason I posted this is b/c it seems under certain rare conditions, the MachE gets a little extra burst of acceleration and I was wondering if anyone felt that either?

.85 longitudinal G is enough to get blurry vision momentarily. The MME GT can briefly exceed 1G on launch. According to my Dragy I’ve seen a max of .65 in our 4X and approx. .85 in my SS sedan. In our modded WRX we’ve seen up to 1.25 G with a 5500rpm clutch drop and 425HP. Very blurry through 1st gear.

 

[Pushrods&Capacitors]

1g is impossible to get from Mach-E, very few cars can achieve that. Not even mentioning the tires on Mach-E are not being able to take 1g.

Not true.

 

[A-A-Ron]

As a fellow engineer (with a tiny amount of hobby-level pilot experience, but admittedly very little real-world aircraft experience) I’m curious… you’re making the argument that flying in a straight line exerts less g-force than when you’re in a turn? That flies in the face (no pun intended!) of just about everything I ever learned about acceleration.

There's a decent enough explanation here in layman's terms: http://learntoflyblog.com/2015/03/30/aerodynamics-turns-and-load-factors/

In fighters, they can actually get pull even higher G's by altering pitch in the turn and getting some turning and altitude forces from engine thrust. Wind up turns make for some incredible g forces.

Alternatively, you actually can do a 1G turn (and even a roll), but you lose altitude like crazy because your 1G of lift stops counteracting gravity (by the time you're upside down you actually have 2G of acceleration but only feel the 1G the plane is experiencing). It does make for some awesome videos. Bob Hoover made a career selling aircraft pouring tea through a roll:

 

[nvabill]

So, as a preface to this, I have done several wide-open-throttle pulls, and have never had an issue with the MachE's acceleration.

However, every once in a while, the motor dynamics and the car's initial conditions will be just right so that I get serious whiplash. I had one such experience the other day where I pressed the pedal in about 3/4 of the way during a 10mph rolling start... it whipped me back so hard that I lost vision for about half a second. Anyone else ever experienced this?

***edit*** changed the title to something a little less dramatic...

You might want to seek competent medical advice and evaluation, what you experienced is not normal for a healthy person.

 

[phil]

but if you aggressively braked, with say negative 1g, and your head went forward, then hit the acceleration for positive 1g… the equivalent translation force on your body would be 2g? This seems to be lost of several people who responded...

No. But if you drive straight into a thick concrete wall at high speed, you could exceed 2g.

Briefly.

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