Turbo-Jett noise levels  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> Turbo-Jett noise levels
Page: [1]

Login
Message << Older Topic   Newer Topic >>
Turbo-Jett noise levels - 6/5/2008 11:22:49 PM   
CustomPC


 

Posts: 349
Joined: 4/19/2004
From: SydneyNSW, AUSTRALIA
Status: offline 		Hi,

A clubmate is entering in the Rare Bare class at this years national air races (Australia).

The class is restricted to Thunder Tiger ARF models (Rare Bare, Sea Fury and September Fury) and allows only .91 2-strokes from OS, TT, Magnum or Super Tigre with a minumum prop diameter of 13" and max pitch of 12"

There is also a noise limitation of 98dB when measured from 3 metres (10') over grass 1 metre (3.3') above the ground and up wind.

The rules also stipulate that tuned pipes are not allowed but there must be an expansion type muffler that is fully enclosed in the cowl.

Will the Turbo-Jett meet these criteria?



< Message edited by CustomPC -- 6/6/2008 12:57:56 AM >
       Post #: 1

RE: Turbo-Jett noise levels - 6/6/2008 1:27:35 AM   
bob27s



Posts: 4833
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline
Difficult to tell if it would qualify.

Other racing organizations and aerobatic organizations recongize the jett-stream and turbo-jett mufflers as mufflers.

As for sound..... I have no sound level data I can share. Sound is entirely dependant on the airframe/prop/engine combination. There are many variables.

Yes, the turbo-jett is fairly quite. A different sound/note than most mufflers. My Jett BSE-100 with a 15x6 prop, turbo-jett installed on an Aeroworks Edge check around 10,000 rpm and a bit below 90db.

That is just an example.

Your combinations are likely looking at 11,000-12,000 rpm range, smaller props... glass fuselage.

In general, hitting 98db on grass at 3 meters is probably achievable based on what you said.

Soft mount the engine and its probably easy to hit.

But I can not guarantee that. Has to be tried, measured... then optimized.



_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to CustomPC)
       Post #: 2

Page:   [1]
All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> Turbo-Jett noise levels
Page: [1]





Jump to:


Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Member Video Posts | RCU Video Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

© 2001 - 2007 24-7 RC, LLC, all rights reserved.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America

Kaango.com Classifieds

0.203RCU1