high G forces

[lee]

I've been playing around some, and while I think all of us expect the pistons/connecting rods/crankshaft to experience high Gs, I thought you might be interested to know the outer edge of the SVX tire (stock size) would experience almost 1500Gs at 150 mph.

If you're really bored and want to play with numbers, look here (I put the calculator up on my home page).

http://home.cfl.rr.com/lbridges/SVX%...alculators.htm

[mikecg]

Suddenly I think I'll start driving slower.............

I thought G forces were forces of accelleration or decelleration. How can a tire, spinning at a constant rate, experience G force?



Dave

[GreenMarine]

It's a tire... It's round... It's not traveling in a stright line... Therefore G forces apply... Do this as a kinda prack app... fill water in a bucket then hold the buckett and spin around and around... The bucket will eventually be nearly parrell with the ground if you are going fast enough... That is because it is trying to accelerate away from your body but instead of letting it go you change it's direction constantly therefor it is accelerating in a diffrent direction constantly... Kinda hard to explain in a post... If ya come to Reading and don't get a better explination by someone else here then I'll explain it better there... Hey this Aerospace Engineering degree is paying off somewhere isn't

[lee]

Hey Green, not bad for an engineering type.


A physicist (like me) would have launched into a long and certainly exceedingly boring lecture on centripetal force, then F=ma, hence acceleration=Gs, etc. You get the idea - and that was the excutive level synopsis.

Ok, but isn't the trick with the bucket centripetal force, not gravity?



Dave

[GreenMarine]

Gravity is a way to explain acceleration... What happens if you jump off a building?? you ACCELERATE twards the ground...

[GreenMarine]

that is the same acceleration that the water in the bucket experiences...

[GreenMarine]

well kinda... Look I can tell that I'g have to do a demonstration for you to TURLY understand it .... THat's cool though... Ya going to Reading??

[GreenMarine]

Originally posted by red95svx
Ok, but isn't the trick with the bucket centripetal force, not gravity?



Dave

Nope Centripical force is measured as an acceleration in a given direction... Gravity causes you to accelerate in a given direction... If ya want to call it this ya could I guess... Centripical force is like ARTIFICIAL gravity...

[lee]

Originally posted by red95svx
Ok, but isn't the trick with the bucket centripetal force, not gravity?



Dave

If it didn't come thru with Green's post....yes it's centripetal force where Force equals mass times acceleration (F=ma)

Some ways of measuring acceleration are: feet per second squared, meters per second squared, or in G's (where 1 G = the force of gravity exerted by the Earth's pull, or if memory hasn't failed me, 9.8 meters per second squared).

Sorry if that sounded lecture-ish - sometimes can't get past my old days as a physics teacher.

[SVXRide]

Lee,
Not to hijack your thread, but isn't your Avatar one of the Trident/Poseiden test launches gone bad off the Florida coast?
-Bill (remembering back to his days as an engineer for the Navy)

[Ron Mummert]

Originally posted by GreenMarineSVX
that is the same acceleration that the water in the bucket experiences...

'scuse me, but wouldn't the water bucket scenario be an example of centriFUGAL force? I ain't never done hear'ed of CentriPETAL force before, but it must exist if Lee & Green say it does.

Ron (all I know is engineers drive trains).

[GreenMarine]

sorry I can't speell to save my life

[mbtoloczko]

Originally posted by lee
..., I thought you might be interested to know the outer edge of the SVX tire (stock size) would experience almost 1500Gs at 150 mph.

...

This would explain why its important to have properly-balanced wheels. :-)