[quote="n7188u"]Today I finally had a chance to get a longer flight in. It's hard to say how much improvement the install of the sound deadening material on the air box has on the internal noise. But
Went up for another hour and made a point of listening to the volume levels in the cockpit at various rpm. The analysis graphs showed volume levels falling off at 5000rpm, so made a conscious effort
Always onwards into the realm of investigation and dissection... "trust the science"!!!! Ever wondered what's inside a 912's factory Rotax muffler? Today's episode of "shut that noise up" was spent l
An update on yesterday's recon into an exhaust muffler... spent the day trying a few different things mods; all that was mostly achieved was a transposition along the frequency band but not much db r
Correct. Grafted component, either 3D print or dissolvable Styrofoam plug with fibreglass skin Read this topic online here: http://forums.matronics.com/viewtopic.php?p=510558#510558
Thanks Clive, Most of the CAD is reverse engineered; the europa is an OCD paradise. Open Foam is open source and great for people that want access to physics analysis, but if you can learn the other
, , still not convinced; happy with the abstractionated abstention.... Carrying on with noise and climate control OCD'ness Read this topic online here: http://forums.matronics.com/viewtopic.php?p=510
Most gas struts will have a C strap clip at each end (some have a wire spring clip); extend the strut all the way and remove the clip; the socket will come away --From the ball. Give the shaft a ligh
Episode 82 of "shut that noise up" Upon the eve of Easter, while out looking out over the distant full moon lit pastures for a pink and white rabbit an idea emerged instead... With feverish reckless
The second black op Obsidian File has been sanctioned for declassification... techniques rumored used for original data extraction have been dispelled however some information remain redacted... some
Today was spent raising the resolution of the analysis and re-running the preliminary solution... Some points of interest were glanced over also being static pressure inside the engine cowl, flow vel
The past weekend has not been good for flying; so more numbers were crunched and more fairings were assessed; it was interesting to try some known shapes, no shapes, different retraction heights, and
Interesting... probably worth increasing the velocity parameters to 75m/sec and see what happens Read this topic online here: http://forums.matronics.com/viewtopic.php?p=510676#510676
Thanks for the input there Bud; always thought provoking.. Gaps and edges can be noise generators. The semi enclosed fairing has a large gap at the rear to allow tyre passing. On something like the e
Breakfast today has turned into brunch as all three model variations had a higher velocity of 75m/sec (150kt) applied; and revealed an interesting anomaly. Its not certain or being ruled out that at
Brunch has turned into lunch.. The fence concept has provided value by reducing the acoustic pressure pulses to almost zero and assisting in keeping trailing turbulence tighter within the fuselage ce
Lunch has now turned into dinner.. there was a brief hiatus in the weather where the sun came out and a bunch of bananas were lopped from the tree and many hands cut off; of bananas, not apes... So j
Have been looking forward to this one... The outcome was disappointing.. was expecting wind in the cockpit; and thats all that really happened... Drag went up 25kg at 100kt for a twin door departatio