Other aerodynamics

Saint.V8 · Jun 15, 2018

I could weigh in on this considering my qualifications as an Aircraft Design Engineer (Anyone recognise half Rho, V squared, S by chance) so don't forget air denisty (Rho) chaps....

Double the velocity quadruples the force acting upon the body......the principles of Fluid Dynamics - as V is squared!

gstuart · Jun 15, 2018

well that’s my brain totally fried after reading that , oh hang on that happens when i read a book with pictures

wammers · Jun 15, 2018

Saint.V8 said:
I could weigh in on this considering my qualifications as an Aircraft Design Engineer (Anyone recognise half Rho, V squared, S by chance) so don't forget air denisty (Rho) chaps....

Double the velocity quadruples the force acting upon the body......the principles of Fluid Dynamics - as V is squared!

Think that is what i was trying to say but not very well it seems.

ovalandrover · Jun 15, 2018

whats the formula to take in account wind speed depending on which direction it come from?

oakey · Jun 15, 2018

And of course height will alter the air density and temperature. Did anyone mention viscosity?

DanClarke · Jun 15, 2018

Mark Piercy said:
Why would you smoke in the car with your kids?

Because of the fire and the superlocking being active?

Grrrrrr · Jun 15, 2018

Saint.V8 said:
I could weigh in on this considering my qualifications as an Aircraft Design Engineer (Anyone recognise half Rho, V squared, S by chance) so don't forget air denisty (Rho) chaps....

Double the velocity quadruples the force acting upon the body......the principles of Fluid Dynamics - as V is squared!

Yes, that's what I thought but Bemble is referring to the power to overcome the whole lot: air resistance, tractive effort the lot.

tomcat59alan · Jun 15, 2018

oakey said:
And of course height will alter the air density and temperature. Did anyone mention viscosity?

And binding brakes

pete12345 · Jun 15, 2018

I must have been absent from them lessons at sch I'm just glad bemble wasn't my teacher

freelance · Jun 15, 2018

pete12345 said:
I must have been absent from them lessons at sch I'm just glad bemble wasn't my teacher

It’s a good job he paid attention and learnt something then !!

frog hopper · Jun 15, 2018

How much more power would you need if you turned the headlights on then ????

Datatek · Jun 16, 2018

frog hopper said:
How much more power would you need if you turned the headlights on then ????

You can calculate it from the wattage of the lamps giving the load on the alternator. You need to know the generating efficiency of the alternator. I'm not going to waste time doing the calcs, but it will only be a small fraction of a horse power.

wammers · Jun 16, 2018

Datatek said:
You can calculate it from the wattage of the lamps giving the load on the alternator. You need to know the generating efficiency of the alternator. I'm not going to waste time doing the calcs, but it will only be a small fraction of a horse power.

Maybe just the tip of the horses tail then.

frog hopper · Jun 17, 2018

I once worked alongside a scientist - mega brain - type, just for something to do one lunchtime he calculated the extra power needed to maintain his cars speed allowing for the alternator etc but also the extra needed to overcome the effect of the light projected from the headlights.
All way, way over my simple brain, no matter how many times it was explained to me.

wammers · Jun 17, 2018

frog hopper said:
I once worked alongside a scientist - mega brain - type, just for something to do one lunchtime he calculated the extra power needed to maintain his cars speed allowing for the alternator etc but also the extra needed to overcome the effect of the light projected from the headlights.
All way, way over my simple brain, no matter how many times it was explained to me.

Think he may have been pulling your leg.

frog hopper · Jun 17, 2018

wammers said:
Think he may have been pulling your leg.

Yeah, I thought it was a **** take but then it was explained (in huge fecking detail) that light is an actual thing, and if you project light out then there is going to be an equal and opposite reaction. I think that was it anyway.

Grrrrrr · Jun 18, 2018

frog hopper said:
Yeah, I thought it was a **** take but then it was explained (in huge fecking detail) that light is an actual thing, and if you project light out then there is going to be an equal and opposite reaction. I think that was it anyway.

He is correct. In the vacuum of space light hitting an object can eventually move it.

wammers · Jun 18, 2018

Grrrrrr said:
He is correct. In the vacuum of space light hitting an object can eventually move it.

So you can go faster at night with the headlamps off. And save fuel that's good to know.

holidaychicken · Jun 18, 2018

None of the laws of physics apply though if the vehicle is A. A van, B. White C. At least one front seat passenger is reading the Sun or is asleep, at which point the vehicle can travel at the speed of light but requiring no extra power. The only other factor to consider is it’s been snowing and only one lane of the motorway is open at which point the van can create its own lane with only a 1 % loss in velocity.

oakey · Jun 18, 2018

Have you not seen the video of the wee thingy being shot up into the air purely by the effect of being hit by light? Was a NASA JPL thing
You can only go faster with the headlights off OR save fuel

Other aerodynamics

Dyed-in-the-wool 100% RR Junkie

D3 Grandad

No longer with us, RIP

Well-Known Member

Well-Known Member

Well-Known Member

Technician, Bodgit & Scarper Ltd

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

No longer with us, RIP

Well-Known Member

No longer with us, RIP

Well-Known Member

Technician, Bodgit & Scarper Ltd

No longer with us, RIP

Well-Known Member

Well-Known Member

Similar threads