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When a motor home travels down the road it displaces air, which flows over
and around the sides. Air is also forced under the coach and referred to as
“Road Draft Airflow”, which, because of Bernoulis law of fluid of
motion is near, or even at a higher velocity than the road speed. When road
draft airflow arrives at the rear of the coach, the air goes vertical carrying
with it any debris it has picked up. This is referred to as the “Station
Wagon” effect. This is the reason your rear camera coats over in wet or
dusty conditions, not to mention the rear of the coach and front of your
towed vehicle.
Add a full width mud flap at the rear of the coach, in effect an
airbrake. This blocks the road draft airflow and produces a boiling effect
- forward between the flap and road surface, forcing debris into the
rear engine compartment where the fan draws it into the radiator
causing an eventual overheat problem and possibly rock damage to the
radiator core. Add oil fumes from the crank case breather hose to
road dust, and the result is a coating of caked on oily dirt. |
Think of it in this way: The road surface and the flap act as a jet nozzle,
blowing debris between the motor home and your towed vehicle, intensifying
the station wagon effect with major turbulence that also induces drag.
Remove the flap, and install a horizontal RV Underskirt with no air
gaps (like our competitors have), between the coach and the towed vehicle.
The curtain eliminates the station wagon effect, reducing air turbulence
with smooth airflow around the sides, top and bottom. Road draft airflow
is unobstructed resulting in better mileage, and lower costs.
Also install an oil separator at the end of the crank case breather hose and this will
collect about 95% of the oil being ventilated from the crankcase. Drain the
oil from the separator when you change the engine oil.
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