Today's Message Index:
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1. 01:27 AM - Re: the Obsidian Files - So Much Noise!!! (clivesutton)
2. 02:31 AM - Re: the Obsidian Files - So Much Noise!!! (Area-51)
3. 05:15 AM - Re: Re: the Obsidian Files - So Much Noise!!! (Pete)
4. 02:02 PM - Re: the Obsidian Files - So Much Noise!!! (Area-51)
5. 07:00 PM - Re: Europa Sun 'n Fun Forum and gatherings. (budyerly@msn.com)
Message 1
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| Subject: | Re: the Obsidian Files - So Much Noise!!! |
Loving your posts on this topic, a great mix of detail and humour. Can i ask where
you get your geometry from - do you use a 3D scanner? And which CAD and
CAE analysis tools please?
On the potential to improve exhaust silencer re-radiated noise, i worked with the
owner of CKT a few years ago to help him develop a cabin heater based on a
shroud around the silencer (loads of heat power there). It didn't progess to
a for sale product for internal reasons, but i know them fairly well/they might
let me have redacted CAD geometry for it that might help what you are doing?
Reducing the noise radiated from the cylindrical silencer is always going to be
difficult. The flatter ends are a possible area. Think Rayleigh pistons - where
noise radiation is concerned as the size and stiffness of the surface controls
both frequency range and ability to re-radiate.
https://pdf.sciencedirectassets.com/271589/1-s2.0-S0307904X00X01564/1-s2.0-0307904X94902275/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjEK%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJGMEQCIFCPjos5H%2FxtbWXTp0wy4ttVGOOXES6hmuoA3NU%2FelO3AiBSvyBAtdtBgFV0%2FZeEEveCMCdsEnkhYVcq8DmHIghHFSq8BQiI%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F8BEAUaDDA1OTAwMzU0Njg2NSIMT87Jt%2B5AWqa5DONdKpAFFgQ0ZRCs%2BitnanKhrL9SRt6alPFvk%2BiZkTt7tJo2%2FG9CanwenQDevtY7EQ%2BHBl3YN%2FlajVeD6YMlJY5Kmi2AdNAYiEpFML20kNU0ZGnfzVl0HRPGpfIFfK1LtqDQx%2Fkhg2sKGG3ULSJnWiGADe7VNGZ5PGuT8S27rgKuqdYgpjmvOPbPA4Q7kfy0B56JQNLLi1XrBJSZVQdmEKcOvZxGZiKvlSGYkTvyx0nzynw7Je%2Fb%2Bl54FWPgTiGnQD6JTDkxJOOcBs2ESO%2FwFbwuTi01nTLz8xGidWom6Ti7BA4kbgPS6IIPcX12uwBGv1l%2BxaTnVVt5Sn733EqFMAyty2EHnuLTJPSNcHPkkVwAEDDa4ZlAsMEjWiIBZSE6Y6A30ls%2FMtge0oS9Go3wKM5EAh73widuMW%2BQVxly64tmb%2BmhH08SfdVKosb6kUh%2F6MYP7OXcQAv%2B0CFZcwbX0LPhBkIYKO6QhvhuhDwheTUvWSuigOjlgnFrnj571yyxuSbjcfiRAKqf%2BghFPXVDCSEPdDSrhAtvS%2Fg%2FzyhbX3C6WWdQXTctXp9mqcYVStRHQfcQyvNDxpc4hdLjlekWrbeUFwC4tItne2hiFzc%2FZKYFwpklF%2Bmtjc2NoPYauVHs2CvwWh6b62YZXb%2BvCmb3tHeLWKm4jKFCYCADmAG%2BWgiLspajl3LR3Emsc6Y3YQGMpCKGwGhgb8vnlIuu8W36C7DFVVmgCAF%2FZtmxcMZy0EkVOgIBk1ZiUsSTkBQb9jeCMlc2ui4K4HlXmXkk9sSE4%2Bb8tYOREhQqo9e1GGwnlsnw0tZcBAUqHm3NUaUz7Ws5W7V3qBvxrhlII2QAUE3cihyeAkv7GNWxMR%2FHDW0YVCTq%2By99gPEwrIWaoQY6sgGidEQi4U%2FVUKVRIurC1fytQzTPz%2FF57FzXZezoRYdSbAAi%2B1RqeVpNiv5M5jyYQ5LdJlHo78KQBSjYkG6VDLYdJSBnDErV17oswO%2FTuclaFYYjAvc0DdMbs1dcgUioy61xSgU%2BZT%2BOaAD5EzGjvKckqnIp5LAFU4oPO%2B3ZkoSHPcUEoBvgmRjJyhFZSGXiwUP33vUUDPWw0khKdb%2BqSCLJyDWL7CooxhHiJ0N%2BbvioMb0I&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date
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| Subject: | Re: the Obsidian Files - So Much Noise!!! |
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 industrial commercial level packages thats
great too; same same results... Blender has just upgraded to a full CAD capability;
another free open source package... after a while they all taste like chicken
to me though.
Not a fan of and never have been one for exhaust affected cabin heating; always
ends in sudden death. Recipe for disaster and up there on the top shelf for a
Darwin Award. It needs a separation medium layer to be even remotely considered
as an option. And with a rotax why even bother, just run it off the coolant
system.
The CKT kit i can probably work out internals by tapping around with a spanner;
but if someone want to through a CAD model at me i'll give it a whirl.. exhaust
is a bit more tricky due to hot gasses cooling rapidly, so speed of sound is
transitioning from x to y to z; so not that straight forward designing on paper
or computer...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510560#510560
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| Subject: | Re: the Obsidian Files - So Much Noise!!! |
Stepping a bit over the line me thinks with the Darwin Award and always bit. Other
flying risks outrank the subject by factors.
Exhaust cabin heating can be done safely, with careful inspection and inflight
monitoring- especially with the stainless construction. In fact, my classics
cabin CO levels are determined not by the heat channels but instead by the outlet
position of the stock exhaust (I extended it), in combination with flap position,
speed, cabin vent/heat pressurization and the europas open fuse flap slots
in a high pressure zone.
PeteZ
> On Mar 31, 2023, at 5:37 AM, Area-51 <goldsteinindustrial@gmail.com> wrote:
>
>
> 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 industrial commercial level packages thats
great too; same same results... Blender has just upgraded to a full CAD capability;
another free open source package... after a while they all taste like
chicken to me though.
>
> Not a fan of and never have been one for exhaust affected cabin heating; always
ends in sudden death. Recipe for disaster and up there on the top shelf for
a Darwin Award. It needs a separation medium layer to be even remotely considered
as an option. And with a rotax why even bother, just run it off the coolant
system.
>
> The CKT kit i can probably work out internals by tapping around with a spanner;
but if someone want to through a CAD model at me i'll give it a whirl.. exhaust
is a bit more tricky due to hot gasses cooling rapidly, so speed of sound
is transitioning from x to y to z; so not that straight forward designing on
paper or computer...
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510560#510560
>
>
>
>
>
>
>
>
>
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| Subject: | Re: the Obsidian Files - So Much Noise!!! |
, , 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=510565#510565
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| Subject: | Re: Europa Sun 'n Fun Forum and gatherings. |
The latest from Sun 'n Fun 2023
It's really nice weather this week. A bit breezy, but clear skies, and delightfully
warm (HOT to many) and well attended by fliers and the public.
Wednesday folks finally started to fly in as the weather fronts abated by Tuesday
up north. It was a huge fly in day filling most of the GA Camping area and
some in the homebuilt camping.
Wednesday Fred Klein, Jerry Hope, Lyle Antieu, Jim, and I all discussed Fred's
accident with the rocker switches having been inadvertently switched off and unnoticed.
I was asked to do a critique of Fred's switches and his fix to put
guards on his ignition, and engine control switches. A smart move on his part.
These small rocker switches are neat, but difficult to see if they are on and
off as they are a very low profile.
Fred's repairs are nearly complete and the engine undamaged so a bit more time
and he'll be flying again.
My only comment for Fred was to replace rockers with lever lock switches that
cannot be inadvertently shut off by simply hitting them.
In my previous military and civil training our instructors always required a blindfold
cockpit check prior to solo. Knowledge by wrote memory and feel sharpens
the quick reactions of a pilot. I'm a fan of it, but in the civil training
environment normally, it is not even a training that is considered. I find
it speeds checklist operations and assists in emergencies and normal ops such
as running out of gas in the main side or aux, night flying, and old guy mental
fog.
As I said, the Sun 'n Fun GA fly in side has been very well attended but homebuilt
camping is only about 1/2 full on Wednesday and another 20 or so flew in on
Thursday.
John Wigney flew his beautiful Europa Mono in on Wednesday afternoon. He reports
the new homebuilt camping area, near the VOR was quite nice and his comment
that there were only two showers for men and two for women meant a bit of patience
was needed in the AM. However, the campground hosts were doing evening
meals and morning light breakfast which John said was very nice. The only drawback
I saw was the tram for transportation to and from the area was a bit annoying
as it ran about every 20 minutes but occasionally was longer. It is a long
walk from the VOR to the airshow East End and a reliable tram was now needed.
John walked the 1/4 mile in short time from the LSA area and there were numerous
carts stopping to pick folks up from the ultralight/LSA area to homebuilt
camping.
I saw Chuck Reinas's trigear, but did not run into Chuck.
It was not as hot on Thursday, but Anita's foot was sore, my back got twisted up
stepping off a sidewalk, so after doing some volunteer work in the AM and some
Airmaster Sale visits, we went home a bit early at 2 PM. I got a well needed
nap in the afternoon, and corrected my back and Anita got her foot taken care
of. A win-win for us.
Jerry Hope leaves Saturday and I think many others will from the homebuilt area
as another front is crossing the Ohio valley area. Florida will be unaffected
but those flying home East of Ohio will be heading out I'm sure with a healthy
tail wind for a change.
Saturday, Anita and I have grand baby visits in Orlando, and we will be away from
the show for the day, but back Sunday to volunteer/assist and staying through
the teardown.
Best Regards,
Bud and Anita Yerly
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