Leaving this morning for the Man Cup World championship weekend. First camping trip with the new Barth and I'm feeling a lot more comfortable about it than I would have with the Euro. My buddies are already there for test and tune and they say the place is jammed with racers. Should be at least 5 four cyl Top fuelers, and a lot of V Twin Top Fuelers, so we're expecting a lot of 6 second passes.
If you're into that sort of thing it will be live streamed. You can find out where on the Man Cup site. Sunday at noon the big boys start the show so you won't have to wait around wondering when they will run.

Send pics of your new ride if you can.
J

Back home safe and sound. The new coach ran pretty bad but nothing that can't be fixed. It was really too long of a trip for a shakedown, and Richard told me about the carb so I can't blame him at all. The coach was a dream to drive and a dream to camp in at the track, the genny started a little rough but after a few minutes smoothed right out, and every system worked perfectly.
Now to get the engine running nice and smooth for Hillsborough!
As for the racing, we saw 2 world records in one run. Larry "Spider-Man" Mc Bride ran a 4.61 at 268 MPH, both records for motorcycles. Not a single wreck all weekend, and I consider that a good thing.

OMG... 1/4 mile, 0-268 mph, 4.61 sec.

Holy crap.. thinking about G forces... must be like the space shuttle launches.

Let's see...my physics teacher told me distance equals one half the acceleration, times the square of the time...

so acceleration equals 2 times the distance divided by time squared?

1/4 mile is 5280 ft/4 = 1320 ft. = distance (x 2 = 2640 ft)

time squared is 4.61 x 4.61 = 21.25 sec.sec

so: a = 2640 ft/21.25 sec.sec = 124.2 ft/sec/sec

(1 G = 32 ft/sec/sec) so: 124.2 / 32 = 3.88 G
Whoa... Keep in mind, this is the AVERAGE G FORCE!!!

We all know the bikes come on stronger early and are leveling out at the end, so the maximum G force early in the race is m more!
(For me this would mean extra trousers needed!)

Only a Barth nut would take the time to consider the force on ones buns, while screaming down a race track.

Yeah, call me weird, inquiring minds just had to know...

(I was just trying to figure out if I'd be strong enough to hang on! NOT! I would have to be able to pull back over three times my weight)

Now, if I weighed 25 lbs...

Ed (Mwrench) could tell us more about the acceleration vs distance from the split times he records at his races.

The shape of the seat must absorb a bunch of the load through ones ass and thighs. When the chute pops and the deceleration load tries to send you over the handle bars what do you hold on to??

quote:

Originally posted by Steve VW:
OMG... 1/4 mile, 0-268 mph, 4.61 sec.

1/4 mile is 5280 ft/4 = 1056 ft. = distance (x 2 = 2112 ft)

Whoa... Keep in mind, this is the AVERAGE G FORCE!!!

Ummm, Steve is your cell phone calculator or memory bank acting up. 1/4 mile is 1320ft X2 =2640. G force is about 5.401.

I don't do ET at my events only speed at the 1/4, 1/2 and end of the mile run. Never saw anyone loose it at start but on shut down 1/2-3/4 mile there have been a few down. I have also seen a guy get blown off the bike when he straightened up after the finish. He didn't realize the wind drag his body presents at 250 MPH. Cross wind is a big factor at my events, wind can vary a lot in a mile run.

Texas Mile results are on their website now Here:
Texas Mile Oct results

For some reason the fastest bike didn't get posted, he did 255.6 MPH in the mile.

quote:

Originally posted by Steve VW:
(For me this would mean extra trousers needed!)

Would be easier (if you have underwear on) to just wear the inside out?

Not the pass from this weekend but it will give you an idea of what these 1500 hp 17 foot long rockets will do. https://www.bing.com/videos/se...0F474789&FORM=VIREll do.

And one more from Saturday night. https://www.facebook.com/racem...os/1457329417657287/ If you look in the stands I'n standing with the white hat and Suzie is sitting next to me.

quote:

Originally posted by MWrench:

Ummm, Steve is your cell phone calculator or memory bank acting up. 1/4 mile is 1320ft X2 =2640. G force is about 5.401.

I redid the calcs now I'm getting 3.88 Gs

Dam phone calculator keypad anyway. (I'm no good at texting either)

With split distances and velocity we could approximate averages for other sections.

I suspect the maximum Gs begin as the tire hooks up for full traction. From there on out it is torque vs rpm through the rest of the power band, probably keep increasing with today's boosted engines. Wow

Those guys are FLYING!

(Actually the trousers wouldn't be for traction, more for containment!)

Geez, this is getting out of hand, what about shift points, always a G-force snap increase in a speed shift.

quote:

Originally posted by Duane88:
Geez, this is getting out of hand, what about shift points, always a G-force snap increase in a speed shift.

For sure, this is by no means simple business. Even with today's fancy computers they spend a fortune to get it right. So many variables it boggles the mind, machine, tires, track conditions, temp, humidity, human factors.

Bottom line: I'd still need those trousers

Those drivers are so damn skinny they probably haven't eaten for like a week before they race, hence no poop!!