> Divorced woman next door to me,one of her boyfriend's pickup truck is
> parked in her driveway.(brake master cylinder problem) His pickup truck
[quoted text clipped - 3 lines]
> gas,I will ride my bicycle.
> cuhulin
Mythbusters did a half hearted experiment with two 'identical' pickups,
one running with the tailgate down, the other running with it up. Was a
shitty experiment, but guess which one went further on measured volumes
of fuel? Yup, the one with the tailgate UP. Auto engineers claimed that
the controlled turbulence in the truck bed actually decreases drag.
Same with most of these airfoils the Highschool Harries love to mount
on their rice rockets. Not worth the time to put them on.
John S. - 23 Jan 2007 20:26 GMT
> > Divorced woman next door to me,one of her boyfriend's pickup truck is
> > parked in her driveway.(brake master cylinder problem) His pickup truck
[quoted text clipped - 12 lines]
> Same with most of these airfoils the Highschool Harries love to mount
> on their rice rockets. Not worth the time to put them on.
I got a huge chuckle out of a Porsche with an automatic spoiler that
came up at approximately 40 mph. I was behind it in traffic and over 5
miles it bobbed up and down maybe 10 times as traffic crossed that
magic 40 mph speed.
I'm sure the guy behind the wheel was feeling like a Serious Driver as
the airfoil light flashed on and off and the foil went up and down in
the rear view mirror. Looked more like a distress signal of sorts from
behind and was good for a laugh.
I'm sure that at some speed that spoiler would help, but those speeds
are illegal, so what's the point.
HLS@nospam.nix - 23 Jan 2007 22:27 GMT
> I'm sure that at some speed that spoiler would help, but those speeds
> are illegal, so what's the point.
Right on, John S.
Steve W. - 24 Jan 2007 01:21 GMT
>>> Divorced woman next door to me,one of her boyfriend's pickup truck is
>>> parked in her driveway.(brake master cylinder problem) His pickup truck
[quoted text clipped - 24 lines]
> I'm sure that at some speed that spoiler would help, but those speeds
> are illegal, so what's the point.
In Germany that spoiler was programmed to deploy over 90mph. The problem
was that the yuppies in the US wanted it to deploy at speeds that they
normally drove at. So Porsche reprogrammed it to deploy at 45 for the US
market. However they also warned that deploying at that speed does lower
fuel mileage.

Signature
Steve W.
Tegger - 24 Jan 2007 01:37 GMT
n.
> I got a huge chuckle out of a Porsche with an automatic spoiler that
> came up at approximately 40 mph. I was behind it in traffic and over
[quoted text clipped - 8 lines]
> I'm sure that at some speed that spoiler would help, but those speeds
> are illegal, so what's the point.
In Germany, that spoiler rises at about 150mph.
Porsche recalibrated it for North American speeds so NA customers would
think they were getting their money's worth.
I had originally thought the spoiler was supposed to rise at 55mph, but
evidently I was wrong.

Signature
Tegger
KjunRaven - 24 Jan 2007 00:24 GMT
<HLS@nospam.nix> wrote in news:Lltth.12704$ji1.4774
@newssvr12.news.prodigy.net:
>> Divorced woman next door to me,one of her boyfriend's pickup truck is
>> parked in her driveway.(brake master cylinder problem) His pickup truck
[quoted text clipped - 12 lines]
> Same with most of these airfoils the Highschool Harries love to mount
> on their rice rockets. Not worth the time to put them on.
the wind tunnel portion of that entertaining experiment did show the
'bubble' of turbulance that forces air above the tailgate tho!........jap-
crap with spoilers. yep. gotta love em. especially if they have them
annoying bumble bee mufflers!
Comboverfish - 24 Jan 2007 01:20 GMT
> jap-crap with spoilers. yep. gotta love em. especially if they have them
> annoying bumble bee mufflers
Bumble bee mufflers... bumble bee...bumble... muffl... oh, fart cans!
Yeah, those are cool.
Toyota MDT in MO
Steve W. - 24 Jan 2007 01:27 GMT
> <HLS@nospam.nix> wrote in news:Lltth.12704$ji1.4774
> @newssvr12.news.prodigy.net:
[quoted text clipped - 19 lines]
> crap with spoilers. yep. gotta love em. especially if they have them
> annoying bumble bee mufflers!
That is NOT a bumble bee muffler, how DARE you degrade a nice insect
like that....
It is properly referred to by the cynics as a "Fart Can"

Signature
Steve W.
Tegger - 24 Jan 2007 01:34 GMT
>> Divorced woman next door to me,one of her boyfriend's pickup truck is
>> parked in her driveway.(brake master cylinder problem) His pickup
[quoted text clipped - 10 lines]
> engineers claimed that the controlled turbulence in the truck bed
> actually decreases drag.
I believe it.
Consider: With the tailgate up, there is created an eddy within the
bed, roughly level with the top of the tailgate, and moving forwards at
its upper surface (which is why leaves and empty beer cans collect under
your rear window). This eddy has the effect of reducing the downward
vertical distance that rearward-moving air would otherwise be forced to
travel down the back of the pickup's vertical rear cab face to reach the
point where it would be directed rearward again upon meeting the eddy, thus
reducing the drag-inducing low-pressure pocket immediately behind the cab.
Now, consider that the tailgate is down: The eddy cannot fully form,
since the air is now allowed to slide out the back more readily. Leaves
and empty beer cans are now more likely to fall on the road and annoy
other drivers. Since the eddy is much reduced, the air leaving the cabin
roof must travel further down the cabin's vertical rear window before
exiting the vehicle's space, which means a larger low-pressure pocket
aft of the cab.
A larger low-pressure pocket means more drag.
Ever seen a Kamm-back pickup?

Signature
Tegger