Lady Anne variation.

[milisavljevic]

The Last part of the first Run Video.

Graham! Please! Say it ain't so!

By posting the video you killed the joy in my independently computing the running frequency of this motor.

I will not watch this video, nor will I let you or Mike (or some other jackdaw wannabe) spoil things further
by telling me what the measured frequency is, until after I have posted my results. The thrill is gone, baby.

So sad,
M.

[Graham C. Williams]

Dear M.
I too have not used this data for the same reasons.
As for the rest of you I don't yet want to know the operating frequency!!!
M. When you are done I'll send you the Original sound track and we'll see.

Best Regards
Graham.

[milisavljevic]

I too have not used this data for the same reasons.

Awesome. You're so cool, Graham, what with your stylish "soul patch" and all.

Good hunting!
M.

[milisavljevic]

M. When you are done I'll send you the original sound track and we'll see.

Morning, Graham! Well, I am done but I have not enough time to post the results just now. Soon!
I sent Mike an email earlier this morning where I described the, um...complexity of the acoustics.

The model had no problems whatsoever sussing out FWE-VIII, but how to "tell the story" without
glassing over your eyes?! Let me sleep on it, then I will dump it all out here in iambic pentameter!

I will leave you with a few, um...teasers (appetizers)

[1] the eCCID for your pulsejet is 56.4 mm (2.22 in.)
[2] the resulting thrust saturation wrt. CCID is ~ 70%
[3] the effective combustor length is 17.4% acoustic*

If you ask him, Mike can tell you why the effective combustor is so short. He's heard it all before.

Cheers,
M.

* the duct was modeled on physical length 559 mm (22.0 in.), ICAO standard day, sea level, 15 C
.

[Graham C. Williams]

Dear M.
I have 5 feet on the floor ready to start walking

Graham.

[Graham C. Williams]

Dear Mike.
James has sent me some *.MOV files of this motor running. They are shot at 300 and 600FPS!! The tailpipe shot is awesome; I think we can see individual combustion events!! We also have induction flames and another of the tailpipe emptying a jug of water.
Is there anyway we can get them up on the forum?

Regards
Graham.

[Viv]

Dear Mike.
James has sent me some *.MOV files of this motor running. They are shot at 300 and 600FPS!! The tailpipe shot is awesome; I think we can see individual combustion events!! We also have induction flames and another of the tailpipe emptying a jug of water.
Is there anyway we can get them up on the forum?

Regards
Graham.

Hi Graham

Or put them on via mediafire and post a link back here

Viv

[Mike Everman]

...or youtube.

OK, I've run the geometry through my acoustic models, too. First, I have to unfold the motor,

fwe8 linearized.JPG (9.23 KiB) Viewed 9018 times

to analyze the open pipe properties, then consider the closed pipe contribution. I can then determine the (virtual point) combustion locus that gets a match for intake length and throat location. The open pipe combustion locus is bracketed by 22 and 25% of the unfolded length. Graham, I'm curious what your locus estimate is in Nudis; for your reference, converted to closed pipe percentages that would make sense to you, I estimate your zero crossing point as bracketed by 13 and 16% of the closed pipe. Is this close?
I have two models, and both are satisfied with the intake length and throat location within .1%.

Otherwise, as with M.'s model, I can make no sense of the tail. I'm still working on a more accurate model, so this is not conclusive, nor will it be as accurate as M's, nor do I yet consider volumetrics or areas. That being said, when M.'s model says it's good, so does mine, generally, and when his says it's schizophrenic, so does mine, for what that's worth

What this motor does have in common with my pocket jet is that intake and throat satisfy both of my models, but the pocket jet has no tail features to make sense of, being a straight pipe. Satisfying both of my models is a rare thing across the many motors I have geometry for.

Faaaascinating. ha

[James D]

I've converted this video file to wmv, it has lost a bit of quality in the process.

[Viv]

I've converted this video file to wmv, it has lost a bit of quality in the process.

Hi James

Could you try a QT or VCL conversion to keep the quality?

Viv

[Graham C. Williams]

The open pipe combustion locus is bracketed by 22 and 25% of the unfolded length. Graham, I'm curious what your locus estimate is in Nudis; for your reference, converted to closed pipe percentages that would make sense to you, I estimate your zero crossing point as bracketed by 13 and 16% of the closed pipe. Is this close?
Faaaascinating. ha

Dear Mike.
I need to check my notes but these numbers ring a bell for the early zero crossing points. Later in the Cycle the 25% trys to disolve but is locked to about 30+% (from memory) under the influence of a minor build at 50%. Then later still we have another at 60 something percent. This last is not part of the combustion but represents a significant pressure rise behind the Hot/Cold Interface in the last part of the tailpipe.

Many Thanks.
Graham.

[milisavljevic]

.

Otherwise, as with M.'s model, I can make no sense of the tail.

Wow...I don't know where Mike's getting this from, as I've said nothing about the tailpipe layout of FWE VIII.
Maybe you're remembering something I said about "camel humps" in a previous conversation?! I've said lots.

For the record: it's not that humps make no sense; it's that there's no point to them, short of adding volume.

I consider FWE camel humps a kind of, um...stylistic affectation?

That being said, when M.'s model says it's... schizophrenic, so does mine...

Double wow...I did say that, but, um...Mike, that was meant to stay, um...private?

My write-up to follow later this evening or tomorrow morning. Schizophrenia and all!

Cheers!
M.

PS: Mike, I'm soooo glad you didn't mention the motor's multiple frequency disorder! A big relief, what?!

[milisavljevic]

.
Missed THIS, from earlier in the thread:

Dear M.
I have 5 feet on the floor ready to start walking.

If you were not already married, I know a lady who really wants to meet you!

And now, these words from our sponsor:

A five-legg-ed man
strode up to me, spoke to me,
most nonchalantly.

I tipped my hat low
and congratulated him;
so impressed was I

I forgot my place
and (oops!) missed the urinal.
He left with a limp.



Cheers!
M.
.

[Mike Everman]

[quote="milisavljevic"]
Double wow...I did say that, but, um...Mike, that was meant to stay, um...private?

Apologies, M. I'm also having trouble separating dream from reality these days...

[Graham C. Williams]

Ah Ha.The Process Begins!!

Graham.