Pilottonny
Well Known Member
Hello,
Here in Europe, noise regulations are very stringent. If not equipped with a muffler system you might be stranded, because you will not be allowed to take off between certain hours (and that is not only during the night!)
Also the landing fees depend on the noise level of your aircraft. For example, the landing fees at Nuernberg Airport will be 29% of that of a "not certified aircraft" for a "Erh?hter Schallschutz" aircraft. This means that you will be paying $ 32,- for a single landing with your "straight piped" RV6/7/9, against $ 9,30 if you are "noise reduced" to 8 dB(A) less than Chapter 10 of the ICAO. (so you would be wasting $ 227,- every time you do 10 "touch and go's" !!)
Because we have to do a noise test to establish the noise level of our plane to get an "airworthyness certificate", it is very important to make the plane as quiet as possible. Now, we all know that RV's are not particularly quiet. I contacted Vetterman about mufflers for the RV9. They sell a system with mufflers, but they only reduce about 6dB(A), which, to me, does not sound a lot and it also reduces the power by 4 to 5 hp.
Of course, also the propeller attributes to the noise. As I understand from reading various lists, comparisons, etc. the MT prop is lighter and may be a little slower, but is also more silent than a Hartzell?
Anybody out there, who has got any numbers, information, or tips on this subject?
Regards, PilotTonny
Here in Europe, noise regulations are very stringent. If not equipped with a muffler system you might be stranded, because you will not be allowed to take off between certain hours (and that is not only during the night!)
Also the landing fees depend on the noise level of your aircraft. For example, the landing fees at Nuernberg Airport will be 29% of that of a "not certified aircraft" for a "Erh?hter Schallschutz" aircraft. This means that you will be paying $ 32,- for a single landing with your "straight piped" RV6/7/9, against $ 9,30 if you are "noise reduced" to 8 dB(A) less than Chapter 10 of the ICAO. (so you would be wasting $ 227,- every time you do 10 "touch and go's" !!)
Because we have to do a noise test to establish the noise level of our plane to get an "airworthyness certificate", it is very important to make the plane as quiet as possible. Now, we all know that RV's are not particularly quiet. I contacted Vetterman about mufflers for the RV9. They sell a system with mufflers, but they only reduce about 6dB(A), which, to me, does not sound a lot and it also reduces the power by 4 to 5 hp.
Of course, also the propeller attributes to the noise. As I understand from reading various lists, comparisons, etc. the MT prop is lighter and may be a little slower, but is also more silent than a Hartzell?
Anybody out there, who has got any numbers, information, or tips on this subject?
Regards, PilotTonny