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TalkTorque

Member
Every time I find the Disco struggling into a strong wind, I keep thinking about this...

Let’s say the TD5’s top speed is 100 mph.

What’s its top speed from a standing start into a 100 mph wind?

Or look at it from another angle. You're zipping along in your TD5 at top speed, 100 mph. Suddenly, you hit a 100 mph headwind. You try to maintain the highest speed possible. What is it?

Beats me. Might be easier to move somewhere with 100 mph winds and try it for real.

TT
 
This can vary from one vehicle to another depending on weight, engine power(cos you'll not find two Td5s to run the same) and other elements which can affect aerodynamics for example roof rack, liftings, etc ... though i doubt that you'll be in the mood to drive around when there is 100mph wind cos that's equivalent of a cathegory 2 hurricane so you'll have other worries then https://www.nhc.noaa.gov/aboutsshws.php
 
TalkTorque said:
Every time I find the Disco struggling into a strong wind, I keep thinking about this...

Let’s say the TD5’s top speed is 100 mph.

What’s its top speed from a standing start into a 100 mph wind?

Or look at it from another angle. You're zipping along in your TD5 at top speed, 100 mph. Suddenly, you hit a 100 mph headwind. You try to maintain the highest speed possible. What is it?

Beats me. Might be easier to move somewhere with 100 mph winds and try it for real.

TT
Click to expand...
You know I keep wondering if you were traveling at the speed of light and you switched on the headlamps would anything happen?
 
TalkTorque said:
Every time I find the Disco struggling into a strong wind, I keep thinking about this...

Let’s say the TD5’s top speed is 100 mph.

What’s its top speed from a standing start into a 100 mph wind?

Or look at it from another angle. You're zipping along in your TD5 at top speed, 100 mph. Suddenly, you hit a 100 mph headwind. You try to maintain the highest speed possible. What is it?

Beats me. Might be easier to move somewhere with 100 mph winds and try it for real.

TT
Click to expand...


Probably around 60 to 70 as would be in a lower gear so more force to push it forwards.
 
Reasonable to assume:
  • physics of this problem will be vastly dominated by turbulent aerodynamics -> resisting force based on square of "air speed"
  • we're aiming for same total power output in both situations
  • work rate is resisting force times "ground speed"
So if x is the answer you're looking for (in mph), solve this cubic:

x * (100+x)^2 = 100^3
 
joojar said:
Reasonable to assume:
  • physics of this problem will be vastly dominated by turbulent aerodynamics -> resisting force based on square of "air speed"
  • we're aiming for same total power output in both situations
  • work rate is resisting force times "ground speed"
So if x is the answer you're looking for (in mph), solve this cubic:

x * (100+x)^2 = 100^3
Click to expand...
mid 40s then
 
MJI said:
You brute forced that didn't you?
Click to expand...
Done this in me head whilst driving -
40mph ->78.4% of 100^3
50mph -> 112.5% of 100^3
Answer must be about 2/3 between the two unless we're in an "unlucky" part of the cubic. That's all I done, honest!
 
joojar said:
Done this in me head whilst driving -
40mph ->78.4% of 100^3
50mph -> 112.5% of 100^3
Answer must be about 2/3 between the two unless we're in an "unlucky" part of the cubic. That's all I done, honest!
Click to expand...

So you did then?

I will admit I did as well
 
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