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Old 12-08-2010, 12:16 AM   #11 (permalink)
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BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
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Well...it's not set in stone fer the angle. The scrap steel stud was handy fer me to prop up the end at the time just to git an idea. What yer seeing mostly is the droop in the coroplast as it gits away from the steel stud.

The height between the top of the tailgate to the coroplast is about 11" and the height from the bed to the top of the cab is about 21". The distance from the bed to the end of the tailgate is about 78". With the mockup as it is now...I can see pretty good out the back.

Keep in mind that the rake of my truck is rather...um...severe when compared to other trucks. I'll have to measure the rake angle at some time to give you an idea of what it is. You can see it in the "grid" piccie above (post #5).

The current ducktail is duct-taped on fer the moment. I'm thinking about putting down some 3M foam tape or Gorilla gluing a metal strip with some threaded studs facing up to fasten it on with. Not exactly sure what's gonna work though...

I'm still building up my half tonneau first and see how well that works out. I really like seeing out the back window a lot compared to when I had the camper top on with the tinted windows.


Last edited by BamZipPow; 12-08-2010 at 12:46 AM..
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Old 12-08-2010, 02:29 AM   #12 (permalink)
T-100 Road Warrior
 
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BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 20.99 mpg (US)

BZP T-100 (2011) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 23.66 mpg (US)

BZP T-100 (2009) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 19.01 mpg (US)

BZP T-100 (2012) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 19.68 mpg (US)

BZP T-100 (2013) - '98 Toyota T-100 SR5
90 day: 20.6 mpg (US)

BZP T-100 (2014) - '98 Toyota T-100 SR5
90 day: 21.28 mpg (US)

BZP T-100 (2015) - '98 Toyota T-100 SR5
90 day: 20.56 mpg (US)

BZP T-100 (2016) - '98 Toyota T-100 SR5
90 day: 20.54 mpg (US)

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Is there any aerodynamic benefit to sloping from the center fer the rear part of the cap? It's doing it naturally because of the lack of support...but should I build it that way or should I put in a support beam to make it straight?

Just did the math with my measurements.

Using this online trig calculator...

Here's how I calculated it...

First calculation:
Opposite = 21"
Adjacent = 78"
Angle (calculated) = 15.07
Hypotenuse (calculated) = 80.7696"

Since I have it 11" higher...
Opposite = 11"
Angle = 15.07
Adjacent (calculated) = 40.85"
Hypotenuse (calculated) = 42.3079"

I add the calculated adjacent side to the original to git 118.85" and plug that back in to calculate the actual angle with the 11" rise from the tailgate.

Opposite = 21"
Adjacent = 118.85"
Angle (calculated) = 10.02
Hypotenuse (calculated) = 120.6953"

If the top ended at the tailgate...the angle would be about 15. Since I have it up 11" from the tailgate, the angle is about 10.


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Old 12-08-2010, 03:16 AM   #13 (permalink)
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It's all about wake reduction, and to max that, you want no wake on the lid, leaving only the rearmost vertical area- tailgate, bumper, etc.- with wake behind them. If the lid has too much angle, flow separates on it and the lid becomes part of the wake zone. If the lid has not enough angle the upper part of it won't be part of the wake zone (good) but the rear area won't be minimized hence it's overall effectiveness won't be maximized.
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Old 12-08-2010, 03:29 AM   #14 (permalink)
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BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
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BZP T-100 (2011) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 23.66 mpg (US)

BZP T-100 (2009) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 19.01 mpg (US)

BZP T-100 (2012) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 19.68 mpg (US)

BZP T-100 (2013) - '98 Toyota T-100 SR5
90 day: 20.6 mpg (US)

BZP T-100 (2014) - '98 Toyota T-100 SR5
90 day: 21.28 mpg (US)

BZP T-100 (2015) - '98 Toyota T-100 SR5
90 day: 20.56 mpg (US)

BZP T-100 (2016) - '98 Toyota T-100 SR5
90 day: 20.54 mpg (US)

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Question

Quote:
Originally Posted by Frank Lee View Post
It's all about wake reduction, and to max that, you want no wake on the lid, leaving only the rearmost vertical area- tailgate, bumper, etc.- with wake behind them. If the lid has too much angle, flow separates on it and the lid becomes part of the wake zone. If the lid has not enough angle the upper part of it won't be part of the wake zone (good) but the rear area won't be minimized hence it's overall effectiveness won't be maximized.
Yes...that's understandable.

So I should try to keep this natural curve?
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Old 12-08-2010, 04:40 AM   #15 (permalink)
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90 day: 18.5 mpg (US)

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It looks quite nice... perhaps that post could be lowered some?
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Old 12-08-2010, 11:31 AM   #16 (permalink)
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BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 20.99 mpg (US)

BZP T-100 (2011) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 23.66 mpg (US)

BZP T-100 (2009) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 19.01 mpg (US)

BZP T-100 (2012) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 19.68 mpg (US)

BZP T-100 (2013) - '98 Toyota T-100 SR5
90 day: 20.6 mpg (US)

BZP T-100 (2014) - '98 Toyota T-100 SR5
90 day: 21.28 mpg (US)

BZP T-100 (2015) - '98 Toyota T-100 SR5
90 day: 20.56 mpg (US)

BZP T-100 (2016) - '98 Toyota T-100 SR5
90 day: 20.54 mpg (US)

BZP T-100 current (2017) - '98 Toyota T-100 SR5
90 day: 19.38 mpg (US)
Thanks: 3,071
Thanked 1,288 Times in 901 Posts
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Wink

Quote:
Originally Posted by Frank Lee View Post
It looks quite nice... perhaps that post could be lowered some?
Well...the post is just to hold it up since I'm working by myself and it just happened to be handy.

I guess it could be lowered...but what is the ideal angle of the cap? I guess the angle would be some where between 10 and 15 based on the calculations I performed earlier.

I guess I could make the next version from this to an adjustable angle to see what would be ideal. Obviously if I want that to happen, I'll have to keep spare side panels available to adjust the cap angle to...
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Old 12-08-2010, 12:26 PM   #17 (permalink)
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BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 20.99 mpg (US)

BZP T-100 (2011) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 23.66 mpg (US)

BZP T-100 (2009) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 19.01 mpg (US)

BZP T-100 (2012) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 19.68 mpg (US)

BZP T-100 (2013) - '98 Toyota T-100 SR5
90 day: 20.6 mpg (US)

BZP T-100 (2014) - '98 Toyota T-100 SR5
90 day: 21.28 mpg (US)

BZP T-100 (2015) - '98 Toyota T-100 SR5
90 day: 20.56 mpg (US)

BZP T-100 (2016) - '98 Toyota T-100 SR5
90 day: 20.54 mpg (US)

BZP T-100 current (2017) - '98 Toyota T-100 SR5
90 day: 19.38 mpg (US)
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Got the half tonneau sheet put on...just 4 screws in the corners and some duct tape on the front edge.



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Old 12-08-2010, 01:59 PM   #18 (permalink)
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BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 20.99 mpg (US)

BZP T-100 (2011) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 23.66 mpg (US)

BZP T-100 (2009) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 19.01 mpg (US)

BZP T-100 (2012) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 19.68 mpg (US)

BZP T-100 (2013) - '98 Toyota T-100 SR5
90 day: 20.6 mpg (US)

BZP T-100 (2014) - '98 Toyota T-100 SR5
90 day: 21.28 mpg (US)

BZP T-100 (2015) - '98 Toyota T-100 SR5
90 day: 20.56 mpg (US)

BZP T-100 (2016) - '98 Toyota T-100 SR5
90 day: 20.54 mpg (US)

BZP T-100 current (2017) - '98 Toyota T-100 SR5
90 day: 19.38 mpg (US)
Thanks: 3,071
Thanked 1,288 Times in 901 Posts
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Piccie at 40mph...
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Old 12-08-2010, 02:54 PM   #19 (permalink)
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Blue - '93 Ford Tempo
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90 day: 33.65 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,377
Thanked 2,908 Times in 1,855 Posts
Quote:
Originally Posted by BamZipPow View Post

I guess it could be lowered...but what is the ideal angle of the cap? I guess the angle would be some where between 10 and 15 based on the calculations I performed earlier.

I guess I could make the next version from this to an adjustable angle to see what would be ideal. Obviously if I want that to happen, I'll have to keep spare side panels available to adjust the cap angle to...
I think we fall into a trap sometimes when quoting an "ideal angle" for a trailing surface. I think it depends on the other geometry around it. For instance, since yours has such a smooth organic taper rather than a sort of 2-D slice off an airfoil profile, I think the angle can be steeper- like how the EV1 backlight is steeper than our "ideal" aero template.

If you can make it adjustable and do tuft tests, that would be the best way to optimize that angle, moreso than us sitting around theorizing about it.
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Old 12-08-2010, 03:28 PM   #20 (permalink)
T-100 Road Warrior
 
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Join Date: Apr 2008
Location: The Woodlands, TX
Posts: 1,822

BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 20.99 mpg (US)

BZP T-100 (2011) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 23.66 mpg (US)

BZP T-100 (2009) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 19.01 mpg (US)

BZP T-100 (2012) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
90 day: 19.68 mpg (US)

BZP T-100 (2013) - '98 Toyota T-100 SR5
90 day: 20.6 mpg (US)

BZP T-100 (2014) - '98 Toyota T-100 SR5
90 day: 21.28 mpg (US)

BZP T-100 (2015) - '98 Toyota T-100 SR5
90 day: 20.56 mpg (US)

BZP T-100 (2016) - '98 Toyota T-100 SR5
90 day: 20.54 mpg (US)

BZP T-100 current (2017) - '98 Toyota T-100 SR5
90 day: 19.38 mpg (US)
Thanks: 3,071
Thanked 1,288 Times in 901 Posts
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I'm thinking about using multiple materials fer the next version...maybe some " R-Matte and coroplast sandwiching it on the top and bottom. It would be lightweight, insulated, and pretty sturdy/durable. Still won't keep the thieves out though...


Last edited by BamZipPow; 12-08-2010 at 03:37 PM..
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