Lady Anne variation.

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Graham C. Williams
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Re: Lady Anne variation.

Post by Graham C. Williams » Wed Jul 23, 2008 12:49 pm

Big Thanks to James D.

Graham
Attachments
Inlet 2 small.jpg
Rear small.jpg
Holes small.JPG
Front 2 small.JPG
Inlet small.JPG
Inlet 2 small.jpg
Spark small.jpg
Spark Plug
Injector small.jpg
4 Holes at about 45 degrees to flow. The Snake
The Lady and I small.jpg
It Doesn't Rain all the time
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Mike Everman
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Re: Lady Anne variation.

Post by Mike Everman » Wed Jul 23, 2008 1:17 pm

Wow! Look at that little thing that makes almost 5 lb!!!
I'm looking forward to the dims. I'd like to look at it in my acoustic model. Let's call it "0.5 D analysis" ha. That's so impressive. Isn't this a contest contender? Holy cow, that raises the bar. Sheesh! Beautiful work by you and James!
As part of my analysis, though, I start by unfolding the motor. I wonder how that will go? It's quite different from others I've input.

How's the starting on it?
Mike
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Graham C. Williams
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Re: Lady Anne variation.

Post by Graham C. Williams » Wed Jul 23, 2008 1:33 pm

Hi Mike.
My pleasure. I'll send you the Dims as soon as I can.
I'm reasonably sure a little more can be had, perhaps another half pound without major changes!

Best Regards
Graham.
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milisavljevic
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Re: Lady Anne variation.

Post by milisavljevic » Wed Jul 23, 2008 1:43 pm

Hello Graham and James -- Wow! Wonderful work there! :D

Graham: I did see your question earlier in the thread and I will post a reply in a day or two!
If you want me to look the new layout over, please allow Mike to email me the dimensions?

Great photos! You make England sound like Vancouver, what with the constant rain and all. :wink:

Cheers!
M.
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for ye merchants who do the prop'r t'ing only if
ye be haul'd-up on charges b'fore ye ship-mates
an' threat'nd wit' forfeiture of all ye precious loot
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avast!
Cap'n M.

Graham C. Williams
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Re: Lady Anne variation.

Post by Graham C. Williams » Wed Jul 23, 2008 1:58 pm

milisavljevic wrote: If you want me to look the new layout over, please allow Mike to email me the dimensions?
Cheers!
M.
Dear M.
I have no problems with that. I probably have your email and will mail them direct.

Graham.
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larry cottrill
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Re: Lady Anne variation.

Post by larry cottrill » Wed Jul 23, 2008 2:50 pm

Graham C. Williams wrote:[As made from 1mm thick S.S.
Without sparkplug
and
without mount and injectors
and
with a nut for spark plug mounting
she weighs 729 grams.

What do you think it would weigh if made from production materials?
You can use 0.5mm material throughout, EXCEPT make the front dome from 1.5 or 2mm material (so it will hold its shape in a crash, since the plug is the main thrust point) -- essentially, you will almost cut the weight in half.

WONDERFUL photo spread of this beautiful little motor!

L Cottrill

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Re: Lady Anne variation.

Post by milisavljevic » Thu Jul 24, 2008 1:50 am

Graham C. Williams wrote:
milisavljevic wrote: If you want me to look the new layout over, please allow Mike to email me the dimensions?
Dear M.
I have no problems with that. I probably have your email and will mail them direct.
Thank you, Graham! I received the email with your drawing from Mike, who was kind enough to convert it
into something I could (easily) open. I will drop your dimensions into my model and provide you the results.

Not having a sound file of the running engine will be interesting: the model will output the fundamental as
well as other acoustic data; we can compare "notes". Should be interesting... Ha! :wink: Should I post it here?

This is really a nice piece of work: congratulations to you and James D. Btw., I also like the fueling 'snake'.

Before I forget: PLEASE post an image (or a link to this thread) over on the contest thread ("Interested?");
people need to see the caliber of ALL the entries we are enjoying! I also have another motor to post there.

Cheers!
M.
no safe haven for merchant scum


for ye merchants who do the prop'r t'ing only if
ye be haul'd-up on charges b'fore ye ship-mates
an' threat'nd wit' forfeiture of all ye precious loot
hear this - so-called stand-up guys YE BE NOT

avast!
Cap'n M.

Irvine.J
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Re: Lady Anne variation.

Post by Irvine.J » Thu Jul 24, 2008 5:44 am

God damnit James! That thing is pretttttttttyyyyyyyyyyy! I am simply speechless.

PJ builds dont get better then that.

Cool snake by the way :)
James- Image KEEPING IT REAL SINCE 1982
http://pulseairdefence.com
[url=callto://project42labs]Image[/url]

Graham C. Williams
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Re: Lady Anne variation.

Post by Graham C. Williams » Thu Jul 24, 2008 11:32 am

milisavljevic wrote: Not having a sound file of the running engine will be interesting: the model will output the fundamental as well as other acoustic data; we can compare "notes". Should be interesting... Ha! :wink: Should I post it here?

Cheers!
M.
Dear M.
Yes, please post the data here
Until James sends me the video of the run I also have no acoustic data.
Tapping the (Cold) pipe she sings at about B flat, nice and Bluesy!!
Oliver tunes his guitar half a step Flat, I’m quite familiar with this note.

Regards
Graham
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milisavljevic
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Re: Lady Anne variation.

Post by milisavljevic » Thu Jul 24, 2008 11:54 am

Graham C. Williams wrote: Until James sends me the video of the run I also have no acoustic data.
Hello Graham!

Even better, neither of us knows anything! I will do my best to post something here before the weekend!

It should not take long once I have a moment, as I can "drop in" your dimensions directly into the model
with the same configuration as I am running on my two superchines. I am looking forward to the results.

It is always educational (and exciting) to exercise the latest model with (and against) realworld(tm) data! :wink:

Cheers,
M.
no safe haven for merchant scum


for ye merchants who do the prop'r t'ing only if
ye be haul'd-up on charges b'fore ye ship-mates
an' threat'nd wit' forfeiture of all ye precious loot
hear this - so-called stand-up guys YE BE NOT

avast!
Cap'n M.

Graham C. Williams
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Re: Lady Anne variation.

Post by Graham C. Williams » Thu Jul 24, 2008 12:43 pm

Dear M.
During my work with FWE style combustors I've come to the idea (conclusion is too strong) that the Effective CC dia is the one to use. I'm quite happy for you not to agree with me on this subject but would like to see the data you generate with a CC dia of 50mm (With this configuration of FWE combustor, induction pipes and tail the ECCD. is somewhere between 46mm and 50mm)? If time constraints are a problem don't worry.

Regards
Graham
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milisavljevic
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Re: Lady Anne variation.

Post by milisavljevic » Thu Jul 24, 2008 1:15 pm

Graham C. Williams wrote: I've come to the idea (conclusion is too strong) that the Effective CC dia is the one to use.
Hello Graham --

I entirely agree with you: the two superchines I am preparing with the assistance of Mike and Fredrik ("Fricke")
feature tapered combustors. The average diameter, based on length, not volume IS in fact the effective value.

As a point of fact, to develop 22 N (4.95 lbf) of thrust from a pulsejet self-aspirating at sea level requires not
less than 49.5 mm of effective combustor diameter. I know this as it is also the eCCID for Mike's superchine! :wink:

I have reams of data from pulsejets dating all the way back to the 1930s to back up my, ahem, conclusion. Ha! :wink:

Cheers,
M.
no safe haven for merchant scum


for ye merchants who do the prop'r t'ing only if
ye be haul'd-up on charges b'fore ye ship-mates
an' threat'nd wit' forfeiture of all ye precious loot
hear this - so-called stand-up guys YE BE NOT

avast!
Cap'n M.

Graham C. Williams
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Re: Lady Anne variation.

Post by Graham C. Williams » Thu Jul 24, 2008 3:30 pm

Dear M.
That's Interesting, thanks. I use two criteria to estimate eCCID.
The first is exactly the same as yours.
The second is given by NUDiS. It is the CCID at the Zero velocity location in the CC during a non-combustion rebound. I measure as the pressure in the CC is rising above ambient and Cold air has entered the CC.
The error in this second value is given by my estimation of the allowable combustion velocity limits either side of this zero velocity point.
This can be a little complex if you have a motor with multiple Zero points in the CC but most 'sorted' motors have only one during early combustion.
A third 'rough and ready' estimate can be had by observing the motor warm-up. It's location where the metal first glows during start-up.

Regards
Graham.
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Graham C. Williams
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Re: Lady Anne variation.

Post by Graham C. Williams » Thu Jul 24, 2008 8:31 pm

The Last part of the first Run Video. :D

Graham
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[The extension wmv has been deactivated and can no longer be displayed.]

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Jim Berquist
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Re: Lady Anne variation.

Post by Jim Berquist » Thu Jul 24, 2008 9:13 pm

Wow! Pritty Slick! Video?
WHAT TO FRAP, IT WORKED![url=callto://james.a.berquist]Image[/url]

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