Aerodynamic Streamlining Template: Part-C

[CFECO]

The GMC motor home chassis would make a great start for a fully aero pick-up. Put a diesel in it with a Toronado high ratio differential, coupled with the very low floor-bed height...hmmm? One could just about, directly copy the template for a body shape. Any one else thinking 30mpg+ with a i 1/2 ton capacity truck?
If Decoliner is Googled, there is a u-tube of the one talked about here, and a really cool Hot-rod version.

[slowmover]

GMC moho's were always plagued by poor traction. The weight balance tends to wind up on the non-driven axle pair. This might be "fixable" but the the GMC frame is also known for serious corrosion issues.

[MPGranger]

wouldn't a belly pan help out with the corrosion?

[CFECO]

I never had a traction problem with my 76 Palm Beach, but I also did not drive it in the snow or much off the road, it sure had a great ride with the torsion bar and air suspension though. The corrosion could be solved easily I think if building a frame off pick-up conversion out of one of these machines, and a belly pan would block off a lot of corners on the frame to catch salt and moisture.

[Vekke]

Today started to make my boattail and the evo1 version is already tested that it wont fall off. Its manufactured from 3mm thick black abs and drilled straight to rear hatch. Length is about 600mm or 24"



Angles used on the side tried to get 10 degrees and the roof according to template C. When I try to fit it to the template it is quite close IMO :/.

[kach22i]

Originally Posted by Vekke

Today started to make my boattail and the evo1 version

That looks devilish.

[Sven7]

Originally Posted by MPGranger

wouldn't a belly pan help out with the corrosion?

Yes, but if the previous owners in the past 30+ years hadn't done that it would be costly to fix.

But it would be cool to build a motor home from the ground up.

[aerohead]

I scored a copy of 'AERODYNAMICS FOR NAVAL AVIATORS',by Hugh Harrison Hurt,Jr.,University of Southern California,Los Angeles,California,August,1959.
In the section on AIRFLOW SEPARATION,page 58,is Figure 1.26.'Airflow Separation (sheet 2 of 2),a photo,from Douglas(Aircraft Corp.)' Report NO. ES 29075,showing turbulent separation on a surface illustrated by reversed flow.
If you establish the centerline of the body of revolution being studied,then determine the tangent angle at the point of separation on the body you find it to be a 22-degree angle.
This is 1959.
W.A.Mair published his 'optimum' 22-degree boat tail report in 1968.
What is old,is older,and is new again!
The image is pretty grainy,but maybe Saturday Al can help me post it.
My aging Hippy neighbors claim that there was a fella every year at the Rainbow Gathering,who's answer to any question was,"22!" Perhaps he was onto something besides the acid.

[Frank Lee]

No, "42" is the answer to everything!

[Sven7]

Originally Posted by Frank Lee

No, "42" is the answer to everything!

One of your best posts, Frank.