A New Lady Keitha Lyne May

Vermin · Post by **Vermin** » Sun Apr 01, 2007 7:33 pm

Well I put the extraction theory to the test with the classic AFWE this design is very vesitile...OMG......so here she is the Keitha Lyne May..2 - 1/2" intakes not angled yet.

The little girl rocks, extractor works great.... on start up you can see how it works (see pic). I placed a very small choke at the end of the CC but it wont do much (to small I think) just slightly slow down the extraction.

Dimensions are coming soon... nice easy build starts and runs well. very good throttle range, augmentation pics soon.......Fun stuff.
Larry another for the list?

Vermin · Post by **Vermin** » Mon Apr 02, 2007 12:04 am

More shots start and exhaust...

larry cottrill · Post by **larry cottrill** » Mon Apr 02, 2007 12:28 pm

Wonderful, Vern. One thing you're discovering is that the FWE chamber design is very forgiving of changes in the rest of the engine. I claim that this is the result of the very low magnitude of harmonics generated.

I'd like to see you do something like this (single or twin stack - or even more!) with the style of intake I used on a couple of my earlier designs:
Smooth Lady -
http://www.pulse-jets.com/phpbb2/viewtopic.php?t=2146
http://www.pulse-jets.com/phpbb2/viewtopic.php?t=2276
Sveldt Lady -
http://www.pulse-jets.com/phpbb2/viewtopic.php?t=1895
http://www.pulse-jets.com/phpbb2/viewtopic.php?t=2290
http://www.pulse-jets.com/phpbb2/viewtopic.php?t=2587

The idea of these was to make a really simple "low profile" type intake. The Smooth Lady intake is a regular, circular tube while the Sveldt Lady uses a split tube and inner flat face design. Eric did not like these much, because they "dirty up" so much of the chamber cone inner surface; I think the low profile nature of them is really cool, though.

Nice work, once again! Yes, go ahead and post the dims and I'll add it to the Evolution drawing, probably adding the appropriate "angle" bend to the intakes.

L Cottrill

Vermin · Post by **Vermin** » Mon Apr 02, 2007 3:55 pm

Larry
It would be interesting to try one of the other units listed but i would have to concure with Eric, I think the beauty of operation and diversity of this profile is its concentric shape, intametly intruding into the cc probably would have many unknown adverse effects, What i would propose is a modified structure as the Sveldt Lady but non intusive X 2, I would think as long as the aspect ratio is similar it should work....RSVP.

Vermin · Post by **Vermin** » Tue Apr 03, 2007 12:37 am

Here are the dimensions for this unit...some may be slightly off because my template is in imperial and this unit was measured out in metric...."one or the other Vern"

"easy starting lots of throttle range and nice visual effects"

FYI so far 2.5+lbs and the bucket on the Red Kneck test stand.

If anyone else builds this unit let me know how it went.

Thanks Vern

Vermin · Post by **Vermin** » Tue Apr 03, 2007 12:42 am

Oh forgot the Vid.....screaming little lady.... must be pre pubesent...LOL

RG Rhodes · Post by **RG Rhodes** » Tue Apr 03, 2007 4:48 am

Say! That sure looks a lot like a twin-choke chinese; no?

Vermin · Post by **Vermin** » Tue Apr 03, 2007 8:31 am

OMG ...Stop the Madness...cloned hybrid fraknenjets what next!!!!!!.....LOL, just trying to put the best features together and having fun in the process.
V

RG Rhodes · Post by **RG Rhodes** » Tue Apr 03, 2007 5:11 pm

Looks really neat; I like it. Next, we need to increase cc diameter to
18 inches. Useing the square-root scaling rule, what would it llook like?
Haven't drawn this up yet; maybe today. Bet it'll be a real fatty. How
big can we go before the SFC drops off the map?

Great stuff, Vern. Keep on truckin'.

RG

Vermin · Post by **Vermin** » Tue Apr 03, 2007 10:55 pm

18" "YIKES"......go for it...anyway the as builts for the unit..
V

RG Rhodes · Post by **RG Rhodes** » Fri Apr 06, 2007 12:53 am

Well, just for the fun of it, I made a sketch of the KLM, scaled up to
18 inches cc dia (dome dia). (as-built dims)

The scaling factor is thus 7.146, for diameters. The square root of this
number, 2.673, was used to scale longitudinal dimensions.

Then I made another sketch of the Sveldt Lady, scaled the same way,
but given three intakes.

They are both over five feet long, and looking at them I'm wondering if
something like this could, in reality, be made to actually work. Fueling
would certainly be an issue: they will be hungry beasts. Liquid fuel would probably be required.

Would the efficiency degrade as size increases, with both thrust per
square inch of cc cross-sectional area and SFC dropping? One wonders.

The area of the 18-inch dome is about 250 square inches.

The pics;

Figs 1 and 2 are the KLM and SL, respectively.

Fig 3 shows a nose-cone on the SL with a draft tube to direct ram air onto
the face of the cc.

As air moves over the outside of the cone, it will increase in speed,
generating a low pressure zone at the gap between the cone and the
cc. This will encourage flow through the cone.

The ring of holes at the front are to ventilate the cone interior.

Fig 4 shows a cross-section of a shroud encircling the engine. As air
enters the shroud, the cross-sectional area decreases causing the air to speed up, as in a venturi. If properly configured, it could produce a
greater pressure drop at the gas than a "naked" engine, creating more
airflow across the face of the cc. The shroud is terminated well forward
of the intakes so as to not interfere with intake phenomena.

The after portion of the shroud some what constrains the airflow, to help
it follow the form of the cc. In the naked engine, I visualise a major flow
disruption at the gap, with the after-part of the cc not being well cooled.

The air exiting the shroud will be much hotter than ambient, and if the
shroud had the right form, a little thrust be generated, reducing net
drag.

As shown, the shroud is 27 inches O.D.

Fig 5 Complete engine

Fig 6 Salt Shaker

Like I said, just for the fun of it.

RG

RG Rhodes · Post by **RG Rhodes** » Fri Apr 06, 2007 1:01 am

Gad! What crappy pics! I know film cameras well; I used to build my own
from scratch- Got a lot to learn about this new digital I bought for the
expressed purpose of posting pics on this site.

Sorry about that, but it was just to give a peek at something really big.

RG

PS Vern- Thanks for the tip about cadstd software. Looked it over and
bought the pro version for 30 bucks. It's all loaded and will be trying it
out soon.
Thanks again

RG

Eric · Post by **Eric** » Fri Apr 06, 2007 7:19 pm

As for taking the pics, try setting the white ballance of the camera to match the type of light you are using to illuminate the picture, the paper will appear more white. Also good lighting helps a lot. Once you do that you can then open the pics up in a photo program and enhance the brightness and contrast, making the white even more white and the blacks even darker.

As for the crazy square root scaling.... no, unfortunately that just doesnt work.

When you increase the combustors volume you have to also increase the lengths and other volumes to take advantage of the elastic nature of the air to properly harness the combustion events.

Basically there has to be enough of a tail pipe to pull in another entire combustion filling fuel air charge to repeat the cycle over and over again.

Eric

Vermin · Post by **Vermin** » Thu May 03, 2007 11:32 am

Sorry folks I posted the wrong diag for the as builts (just to many and I have deleated all the PT drawings to save more confusion), anyway here is the actual as builts..hopefully i didn't cause any frustration.

www.pulse-jets.com

A New Lady Keitha Lyne May

A New Lady Keitha Lyne May

New Lady In Town

Dimensions

KLM

OOps