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Old 04-29-2010, 06:59 PM   This thread is in the EcoModder Project Library | #1 (permalink)
swede
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Location: Winnipeg, Canada
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Swede's AeroLid build thread

Following in the footsteps of others here I have decided to build an aerodynamic cover for my 2009 GMC Sierra. The truck has a 4.8L engine, automatic transmission and 4wd. Current HWY average is 20-21 mpg US.

Highway cruising speed is consistently 105 km/h and terrain is varied on my weekly round trip that totals 550km. This is a 225km one way trip from my hometown to work.

The idea for the aerolid is following along design that Bajascoob used. I bought 100' of 1/2" tubing for $29.00 CAD and will try using some leftover 6mil vapour barrier plastic that I have.

Total costs so far:
1/2" EMT $29
1/2" EMT bender $50 (Gotta have the right tools )
Angle indicator $22

The basic layout will be similar to Bajascoob's unless there have been any inherent faults with that design so far. A basic tapering down and in towards the tailgate will offer a rudimentary "boat tail" to the lid. I plan to have it hinge up at the front like a solid tonneau if a good strong design comes together.

So far it looks like I'll have a 12 degree slope from cab to tailgate. I'll have to hump it a little just after the cab to prevent a sharp angle change and cause airflow separation. Here are some pics of what I've started with.

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1994 electricfly EV conversion 36V/450A/60km/h
1997 Suzuki Sprint hatch (parts car?)
1998 Geo Metro sedan 1.3L auto (the wifes)
2009 GMC Sierra 27us/mpg best yet (still workin on it)
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