I googled "top fueler acceleration" and got lots of stuff including the
following:
www.timskelton.com/valkyrie/gen ----"5.5 g, 5465 HP"
http://mark.denovich.org/archives ----"for 300 MPH in 4.5 seconds, average
of over 4g's, launch acceleration approaches 8 g's to reach 200 MPH well
before half-track."
And a really interesting site for all kinds of engineering issues,
www.eng-tips.com under "drag racing tires" in the Automotive Forum, Larry
Meaux, an "ET Analyst for Dragracers", says "5g in the first few feet
tapering down to 4g at 660 feet" with details of a run as:
60 feet---0.85 secs
330 feet--2.38 secs
660 feet--3.081 secs and 265.64 MPH
1000 feet--3.88 secs
1320 feet--4.57 secs and 321.77 MPH
Another contributor to the same forum gives the following data: "over 5 g's
for the first 100 feet, car weighs about 2175 lbs at start of 1320' run of
4.5 to 4.7 seconds, about 12,000 lbs of force pushing the car only by the
tires, there is an exhaust thrust force pushing the car down and back but is
probably less than 500 lbs in each direction"
The above leads me to believe my triangular envelope assumption with max g
at the start tapering to zero at 1320 feet is still a good first cut, but I
haven't yet tried to fit it to Larry Meaux's data above.
Lance
----- Original Message -----
From: "DrMayf" <drmayf@teknett.com>
To: "Joe & Lynne Lance" <jolylance@earthlink.net>
Sent: Wednesday, January 05, 2005 11:39 AM
Subject: Re: Engine Config
> Hey, I bet they have the data, so let's ask! You take the top fuel guys
and
> I will try the Force camp in FC. I would love to see the accel plot vs
time.
> Great idea!
>
> mayf, off planet in Pahrump
>
> ----- Original Message -----
> From: "Joe & Lynne Lance" <jolylance@earthlink.net>
> To: "DrMayf" <drmayf@teknett.com>; "John Burk" <joyseydevil@comcast.net>;
> <land-speed@Autox.Team.Net>
> Sent: Tuesday, January 04, 2005 8:20 PM
> Subject: Re: Engine Config
>
>
> > Good points mayf, but I would still expect max g to occur fairly close
to
> > the start line very early in the timed run. Very different than the
> > acceleration curve of a falling object in a vacuum---acceleration peaks
> very
> > close to the start line and decreases from there to the end of the
quarter
> > mile is my back of the envelope assumption, but yes, there is a lot of
> > non-linear stuff going on to make for interesting calculations. I'd
still
> > like to see some real acceleration data from just one good top fueler
run.
> >
> > Lance
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