I have a 4' x 8' HF trailer(1000# capacity) that I have pulled
thousands of miles & not noticed any difference.

YMMV,

Tom B.-w/ stock og 1.9

On Jul 29, 2007, at 12:56 PM, Robert Keezer wrote:

> I wonder how  a small 4 foot by 4 foot box
> trailer  affects the drag behind a Vanagon? Any
> info?
>
> Robert
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> 1982 Westfalia
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> --- Frank Grunthaner <FrankGRUN@AOL.COM> wrote:
>
>> In a message dated 7/28/07 2:47:37 PM,
>> albell@UVIC.CA writes:
>>
>>
>>> Finally a worthwhile discussion :)
>>>
>>> Frank, hats off on your undercarriage work.
>> Definitely a do-able
>>> solution. The rear low press problem is
>> harder. Instead of trying to
>>> fair that area how about an attempt to "curve
>> the flow" in there?
>>> While not nearly as effective it may be more
>> practicable. I'm
>>> thinking of wings/winglets on top and sides.
>> We've seen some full
>>> width top wings and the smaller deflectors
>> (linked posted on list a
>>> few years ago, NZ? firm making small
>> deflectors).
>>>
>>> A splitter also may be effective. Flat panel
>> perpendicular to rear
>>> hatch, length to be determined.
>>>
>>> I have a spare small water tunnel that my
>> revell Vanagon model would
>>> fit in. Would be useful for flow
>> visualization and perhaps some
>>> scaled drag values.
>>>
>>>
>>> Alistair
>>> Alistair,
>>
>> Good idea. The Revell kits are very accurate.
>> You would have to fill it with
>> a hydrophobic fill to make certain there were
>> no spurious flow paths. Bees
>> wax! The deflector would at first thought
>> increase drag, but the energy release
>> by eliminating or backfilling the low pressure
>> zone should overcome any drag
>> addition. I like the idea of the liquidics test
>> with some marker streams. I
>> believe that there are some interesting fluoro
>> emitters when excited by turbulent
>> flow as well.
>>
>> BTW, the pressure characteristics at the back
>> of the van are very complex. A
>> partially opened hatch still gives rise to a CO
>> increase inside the van if the
>> windows are closed.
>>
>> Frank
>>
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>>
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