View Single Post
 12-08-2010, 02:29 AM #12 (permalink) BamZipPow T-100 Road Warrior     Join Date: Apr 2008 Location: The Woodlands, TX Posts: 1,895 BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5 Last 3: 24 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 Last 3: 25.45 mpg (US) BZP T-100 (2013) - '98 Toyota T-100 SR5 Last 3: 25.79 mpg (US) BZP T-100 (2014) - '98 Toyota T-100 SR5 Last 3: 23.18 mpg (US) BZP T-100 (2015) - '98 Toyota T-100 SR5 Last 3: 23.85 mpg (US) BZP T-100 (2016) - '98 Toyota T-100 SR5 Last 3: 17.62 mpg (US) BZP T-100 (2017) - '98 Toyota T-100 SR5 90 day: 20.78 mpg (US) BZP T-100 (2018) - '98 Toyota T-100 SR5 90 day: 20.19 mpg (US) BZP T-100 current (2019) - '98 Toyota T-100 SR5 BZP T-100 (2020) - '98 Toyota T-100 SR5 Thanks: 3,370 Thanked 1,355 Times in 943 Posts 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°.