160 DZ noise

[brian young]

It would be interesting to revisit the noise rules for  a different approach. As these engines are developed w/ more cubic inches it becomes more difficult to prop them effectively. Thus the multi blade props.
 
lol...hope I dont regret mentioning this. 


Adam Glatt <adam.g at sasktel.net> wrote:
That brings up a good point. With the release of JR's PCM synth 
receiver, it is now very easy to monitor throttle positions from the 
ground for every competitor. Anyone willing to volunteer their synth 
receiver next July? We need one JR and one Futaba.
-Adam

Chad Northeast wrote:
> 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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