Dave Dahlgren
A very confused engineer
Clearly the very high speed cars need a gearbox to approximate their top
speed by mile 4. They are geared so high they would be very much below
their power band on launch. However, there must be a lot of cars, depending
on wind resistance, horsepower, and weight, that reach nearly top speed by
mile 4 with or without a gearbox. This was not an exercise in theories, I
was asking the group for their experience in this area as a matter of
interest. Any more experiences?
Dave the Hayseed
----- Original Message -----
From: dahlgren <dahlgren@uconect.net>
To: The Butters Family <bbutters@dmi.net>
Cc: Marge and/or Dave Thomssen <mdthom@radiks.net>; Land-speed Racers
<land-speed@autox.team.net>
Sent: Monday, August 28, 2000 3:22 PM
Subject: Re: Bonneville Transmissions
So if I understand this right then... If I put my pro stock car in 4th
and leave the starting line that that at the end of the quarter mile the
car will go the same speed as if i used all the gears?? When you lose 5
mph at the quarter does your car go the same speed at the 5 as if you
were not 5 mph down?? Why do all the 'big' streamliners keep wanting a
longer course ??? How fast does your car or cars you have messed with go
??? I am sure that if I start in any gear that my Pontiac i drive on the
street will go exactly the same speed at the 5 no matter what gear I
start in.. but going 125 is not much of a challenge either. How do
explain away the change of shift points in Keith Turks car making 203 at
the 3 instead of 197 at the 5???? Doesn't having the correct gearing and
going as fast as soon as possible make the course appear to be longer
because you are going faster sooner and have more distance left to get
the last MPH out of the car??
to quote "We got a 225 record with 183cid 3rd gear only??? Nebulous"
Is this the theory you are using?? Do you think the 225 might of been a
245 with all gears working??
well we got a 216 record 219 qualifying with a 91cid gas lakester and
went 213 at the 1/4... used all 5 gears.. which one is more efficient
??? and that was on the first pass.... Do you think if we left in high
gear that the car would of gone 219 at the 5 on 91 inches ??? What's the
physics behind your theory??
Oh yeah and the e-mail you quote.. what's that thing doing on the long
course at 179 if you should be going over 175 at the quarter in the
first place???
Hate to make this sound like a flame but I really can't figure out the
logic behind it all.. Help me be smarter and tell me how this is all
supposed to make sense..
A very confused engineer..
Dave Dahlgren
The Butters Family wrote:
>
> This has been my experience with every car I've ever messed
> with, the speed it was able to generate in a given distance hadnothing to
> do with the number of gears you shifted it threw, just the power it had
> available to do the job. Kvach----- Original Message -----
> From: Marge and/or Dave Thomssen <mdthom@radiks.net>
> To: Land-speed Racers <land-speed@autox.team.net>
> Sent: Sunday, August 27, 2000 7:35 PM
> Subject: Bonneville Transmissions
>
> > Well, gang our experience might be interesting. In 1979 we ran the
> Original
> > Goldenrod streamliner (the one from Denver) with my flathead (unblown on
> > gas) and a T-10 4 speed. It ran 179 MPH in the last mile and we thought
> the
> > gear spread was just right for the motor until something malfunctioned
in
> > the transmission and it locked in high gear. We pushed it off as fast
as
> we
> > could (60Mph) and it chugged off barely able to pull away from the push
> > truck. The quarter time and the 2 and the 3 mile were slow, but it ran
> > 179MPH in the last mile anyway. Anyone have similar experience that
might
> > suggest that a long course car doesn't need a transmission at all?
> >
> > Dave the Hayseed
> >
> >
> >
> >
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