Ram Air Inlet Scoop - Improve Performance
Ram Air Inlet Scoop: - The "RAIS"
system enhances engine performance by maximising the effect
of ducted "Ram Air" generated by the air flow and
propeller into the engine throttle body via a plenum system.
This system is similar in concept to those installed on the
more advanced WW2 fighters such as the P51 as well as on modern
Turbines to increase airflow into the engine air intake system,
thus increasing engine power by way of increased mass flow.
As the name implies, we are using Ram Air from the propeller.
The "RAIS" system was first designed and installed
on an RV 8 by owner Ray Jarvis to improve engine performance
at all levels of operation. With much interest from other
RV owners, Ray, Jon Johanson & Brett Turner have combined
their talents to improve the
design of the "RAIS" and through his company "Flymore"
Jon now offers the "RAIS" to the RV market.
It has achieved exactly what it was designed to do!
Of the two test aircraft, one is an Airflow Performance fuel
injected 180hp fitted with a three blade "MT" propeller
and the other is a Bendix fuel injected 200hp with a two blade
Extensive flight-testing has shown increases
in excess of 2” of Manifold Pressure Recovery at 1,500’
and 1" of Manifold Pressure Recovery at 10,000’.
These increases are improvements compared to Van’s snorkel
type induction (not the rhino horn induction).
The system is designed to be utilised with a "Forward
Induction Sump" (M1B), however vertical induction sumps
may be used with the incorporation of an elbow on the throttle
Please note, the throttle body MUST be orientated
horizontally. If you are changing from vertical to horizontal
induction, the throttle body needs to be adjusted by a suitably
The "RAIS" system includes the scoop, filter mount,
intake plenum, scat tube clamps and filter. The "Scoop"
incorporates a circular Access Hatch, which allows direct
access to the Throttle Body, both for servicing and adjustment
as well as installation and removal of the scat tube.
It is designed to be installed on RV 6, RV 7, RV 8 & RV
9 aircraft. It may be easily installed on either of the lower
cowl designs as supplied by Vans. Tricycle (A) versions of
the above models may also utilise the "RAIS" unit.
Instructions supplied will carefully lead you through installing
this equipment to your RV aircraft. Apart from increasing
the performance of your RV, it will also enhance its appearance!
"Custom Aero" of Parafield have
been involved in the RAIS from its development, they can not
only install the units at a highly competitive price, but
can also deal with throttle body conversions from vertical
Contact us for pricing
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