Pickup Cab Wing Angle - Measure from Where?

[Bruce]

I just got an email notification of the latest response to this thread.

Hard to believe it's been nearly eight years.

The main reason I scrubbed the project was that I needed the truck to be a truck. Attachments over and on the bed were a real pain because I need to be able to throw stuff in the bed. Animal feed, building supplies, etc. I also built a cage that my wife and daughters use to haul their goats. It fills the whole bed.

All of that aero stuff just got in the way.

[freebeard]

Hard to believe it's been nearly eight years.

Which makes an eight hour response time impressive.

[kach22i]

The question remains, was there a better way to test the results?

[gumby79]

Is gravity not the most consistent power input known to man?
It takes out many of the variables that impact the engines power output at a consistent throttle position( yes these are variables /inconsistency that are relatively small ,so are some of the changes that are being chased).

Sounds like the OP did throttle stop testing.
setting there stop at 0 % throttle position. , in Neutral (this negates weather the computer is programmed to lock the torque converter clutch or have it in free spool for slower speed testing. Eg. GMC/Chevy Allison program running the TCC open till 5th[1st overdrive 0.71:1 ])

Gravity Drop Testing aka a more consistent version of Throttle Stop Testing was what I used to determine the air dam prototype that I built had a negative impact on my aero. I noted a reduction in speed on my 6% grade that is 3 miles long, this test was confirmed when Arrowhead ran my truck at Darko. Ditto for the bug deflector big negative (negated the 24% Improvement of my 3D boat tail canopy)

I thought his answer was pretty clear on additional testing is no.
For 2 reasons
1 Julian hook wasn't published yet nor was he participating in sharing his knowledge on this website yet . As well as Julian gets mad at me when I try and talk to him about pickup trucks as his book and I quote was specifically written for cars nowhere in the title does it say anything about trucks leave me alone." (Bitter taste words off most predators)

2 the concept proved unusable/ too troublesome in real life therefore was abandon.

The white paper is a good starting point for Research into where someone elce thought to look to correct the deficiencies of the produced 3 box pickup done to SAE standard, and of course lots of testing on these and more variables to find your best use case scenario of Form and Function.

[JulianEdgar]

Originally Posted by gumby79

Is gravity not the most consistent power input known to man?
It takes out many of the variables that impact the engines power output at a consistent throttle position( yes these are variables /inconsistency that are relatively small ,so are some of the changes that are being chased).

Sounds like the OP did throttle stop testing.
setting there stop at 0 % throttle position. , in Neutral (this negates weather the computer is programmed to lock the torque converter clutch or have it in free spool for slower speed testing. Eg. GMC/Chevy Allison program running the TCC open till 5th[1st overdrive 0.71:1 ])

Gravity Drop Testing aka a more consistent version of Throttle Stop Testing was what I used to determine the air dam prototype that I built had a negative impact on my aero. I noted a reduction in speed on my 6% grade that is 3 miles long, this test was confirmed when Arrowhead ran my truck at Darko. Ditto for the bug deflector big negative (negated the 24% Improvement of my 3D boat tail canopy)

I thought his answer was pretty clear on additional testing is no.
For 2 reasons
1 Julian hook wasn't published yet nor was he participating in sharing his knowledge on this website yet . As well as Julian gets mad at me when I try and talk to him about pickup trucks as his book and I quote was specifically written for cars nowhere in the title does it say anything about trucks leave me alone." (Bitter taste words off most predators)

2 the concept proved unusable/ too troublesome in real life therefore was abandon.

The white paper is a good starting point for Research into where someone elce thought to look to correct the deficiencies of the produced 3 box pickup done to SAE standard, and of course lots of testing on these and more variables to find your best use case scenario of Form and Function.

Not sure how I come into this but I describe using gravity testing in my book (page 104).