Rotax air box - does it reduce noise? Some say yes - our measurements
say no.
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Does the installation of an air box on a Rotax engine reduce
noise?
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Does a Rotax Air Box Work?
The following can be found at: http://www.durham-microlights.co.uk/technical_tips.htm#Landingonwater
This article is by Kevin Armstrong:
One discovery worth passing on, go
out and buy an air - filter silencer, it knocks the horrible roar off when
taking off on twin - carb models, and stops fuel dripping out of the
pancake. Baffling fact:- despite having to fit a smaller jet-kit the climb
rate and consumption is exactly the same, although I would have accepted a
little performance penalty. Have cruised next to a Rapier with standard
set up, speed is exactly the same.
It is a factory mod so you can fit it
without any beurocracy, Roger (Mainair) will flog you a support - bracket.
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The real reason I put one one was to 'encase' or shroud the carbs so that
the heat from the air cooling vent didn't waste the air all over the
place; it works, carbs are lukewarm.
Recent update from Kevin with pic.
503/582 twin carb with air-filter
box from Rotax gives:-
-
2.4 DeciBel sound reduction
-
No change in performance I can
detect despite smaller jetting
-
Warm carbs (they shroud the
carbs and gather the heat from the cowling)
-
No fuel leaking out of the
standard pancake
-
Mainair have it down as a
factory mod, so no paperwork thank God.
-
(Air Création fit them as
standard to the Fun Gt)
Photos enclosed, actually looks good in the flesh
Editor's note : I am nervous about
fitting one to my 582, as it would appear to block off the air flow to one
of the radiators - anyone who has successfully fitted one please let us
know how the temperatures behave.
Ultralight News:
I have measured the difference in sound
from the ground at 500 feet with an aircraft using an airbox and one
without and have found NO difference in the noise when using an air
box to just using an air filter.
To reduce noise - use a higher ratio reduction ratio, and spin a larger
multi-blade propeller slower.
Would you be able to hear one kid whispering in a
crowd of kids screaming? The air noise passing the aircraft in
flight, the exhaust, the prop are all louder than the noise from a
carburetor with an airfilter on it!
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