91 Dodge airocap
 

This is my prototype airocap
Attachment 17595
making my rain drop

Truck is a 91 Dodge D250. 2wd 3/4t
A less than150lbs for complete airocap and headache rack
I used 12mill boat shrink wrap for my prototype covering
http://pages.ebay.com/motors/link/?n...363918&alt=web

$169 usd shipped for 10 ft x40ft this thickness is only available 40ft wide by $10usd per ft.
Thinner, cheaper, narrower shrink wraps are available, other cover options are ortex600, ortex6000, aircraft fabric, or regular canvas as well many others. I went with shrink wrap for quick repeatable and smooth and cheep prototype. for the aircraft fabric and ortex they require special adhesive to attach. Ortex600 is my choice for my final covering and canvas would be flapy and heavy after waterproofing

Attachment 17594
the canapé can be removed for aquard load or simply closed on the load.switch leaves the headache rack with its taper from cab width to mid bed rail . The steel frame can support aprox. 180lbs (me) hanging in the center. Can you say snow load
Attachment 17597
Attachment 17596
I set the rear defuser at approximately 10" past to clear the tailgate for opening and closing without opening the cap

Awesome has happened when you aero mod a 1st gen Dodge with a 12 Valve :D

None of your pictures came up, and the links are dead? If you will, upload them to a photo database such as Photobucket or Postimage.org Copy the direct link and paste in the box after clicking the "Insert Image" button. It is yellow with a mountain on it. Hit Enter and the picture should be in the reply for you to post.

Attachment 17600

Attachment 17601

Attachment 17602

Attachment 17603

That is different! I dig the boat wrap you used, that was something no one has thought of yet to my knowledge.

Any mileage increases to speak of?

better mileage
 

first tank was above my average (2nd best) wile loaded 5520 tair 7160 gross with dirty air 22.6 fuel fill dated 05/ 05/ 15 up the Columbia river gorge . As compared with 01/09/15 fill 20.06 mpg going the other way.
2nd tank same load 550el to 5600el 22.22 up contanental divide dated 05/07/15 compared with down @23.01
Conclusion
yes it worked despite a load and not able to close all the way

oratex 600 light weight oratex 6000 going through FAA approval process
 

My easy compound curve fabric for after prototyping

Oratex Specifications and Technical Data

Oratex6000
Material: Modified polyester
Material thickness: Approx. 170 µm (.0067 in.)
Weight: Approx. 140 to 160 g/m² (0.459 – 0.524 oz/ft²)
Tensile strength lengthwise: Min. 1300 – 1600 N/50 mm
Tensile strength crosswise: Min. 1100 – 1400 N/50 mm
Breaking extension lengthwise: 12 – 20%
Breaking extension crosswise: 12 – 20%
Tear propagation load lengthwise: 26 – 32 N
Tear propagation load crosswise: 28 – 34 N
Burst strength: > 1000 kPa (> 145 psi)
Burst elevation: > 15 mm (> 0.59 in)
Shrinkage lengthwise: 9 – 13%
Shrinkage crosswise: 8 – 12%
Flammability: Not flammable after application to airframe
Melting point: 250°C (482°F)
Air permeability: Airtight
Other characteristics: Fuel resistant, can be painted
Oratex600
Material: Modified polyester
Material thickness: Approx. 120 µm (.0047 in.)
Weight: Approx. 92 – 122 g/m² (0.301 – 0.4 oz/ft²)
Tensile strength lengthwise: 750 – 1050 N/50 mm
Tensile strength crosswise: 650 – 950 N/50 mm
Breaking extension lengthwise: 10 – 18%
Breaking extension crosswise: 11 – 20%
Tear propagation load lengthwise: 18 – 24 N
Tear propagation load crosswise: 16 – 22 N
Burst strength: 500 – 700 kPa (73 – 102 psi)
Burst elevation: Approx. 14 – 18 mm (0.55 – 0.71 in)
Shrinkage lengthwise: (338°F) 8 – 12% (reference temperature 170°C)
Shrinkage crosswise: (338°F) 8 – 12% (reference temperature 170°C)
Flammability: Not flammable after application to airframe
Melting point: 250°C (482°F)
Air permeability: Airtight
Other characteristics: Fuel resistant, can be painted

That's an interesting material. How did you fasten it to it's framework? Staples?

The shrink wrap is heated to almost melting pointand it sticks to it self[edit add :as compared to the oratex is put on with a heat activated glue to it self or your frame of choice

I'm a little confused and have a hard time figuring out what you are saying. can you please explain what it means above in bold?

'tair' = tare

el = elevation

'fule' = fuel