160 DZ noise

[Chad Northeast]

Tom

Is this without an air restrictor?  If not have you tried it with one?

I beleive most of the 160/170DZ pilots in France were running some form 
of intake restrictor on their engines.....as well as condition 
switches!  j/k I really dont know that for certain.

Chad

Koenig, Tom wrote:

>Gents,
>
>Just shooting for prop combinations.
>
>On the weekend we were doing some ( disturbing) noise tests. We are also about to run our annual comp and team trials for CAOCC and our Bi-annual Trans Tasman punch up with the new Zealander's, where we will be noise testing. so I thought I'd better be prepared.
>
>Anyway- my 160 DZ, Hattori 698, CD header on 29 % Nitro Coolpower 'blue' oil, Hyde style soft mount, APC 16.5 x 12 W and Synergy airframe produced 99 DB at 3 meters @ 8600 rpm!!!!!!!!
>
>This thing is making a RACKETT!!!!!
>
>Next day I went down to 25% Nitro and 15.5 x 12.5 W and reduced this to 95 DB.
>
>Now I am not running that different a set-up to most people, but it confirms my suspicion that most of those that I compete against are WAY over the noise limit.
>
>Since I have heaps of power I am about to try a 20% nitro mix and see if I can get the thing to shut some more. I am also considering trying a 15.5 four blade.
>
>Those of you who HAVE noise tested your set ups.....what are you using successfully???
>
>Thanks for any recommendations.
>
>Tom
>
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