Mike's Build Log

[Graham C. Williams]

Thanks, Graham!
---- and try some tail expansion.
The acoustic length, intake length and throat location are in the same places.

Dear Mike.
A good place to start. going from straight exhaust to expanded tail does not seem to be quite linear; you may have to move a little either side of this length!

Regards
Graham.

[Irvine.J]

I have been dreaming again about the idea of the aluminum bottle full of fuel and the dropping of a rubber banded Bic lighter, screw on the cap, and viola!, pressurized gasoline.

What a good idea! haha! The jet lighters are a little better for it simply because they dump enough gas to keep up with the flow rate.

[Mike Everman]

Ah, was that YOUR idea, James? My mind is a wasteland! I thought that was mine. Oh well.

[Mike Everman]

Boy, the search function works great. Just did one for "bic lighter", and there I am talking about doing this in June '05!
Ooooooooooooh SNAP, James! bwaaahaha

[Irvine.J]

ROFL great minds think alike

Heres something for you though, my bic lighter holds around 2 times more gas then my jet lighter, but the jet lighter lets it out (judging by a bag expanding) maybe 3 or more times quicker. Conundrums...

[thecheat]

Ha! I've been thinking along the same lines too! Mainly using a 20oz propane bottle to pressurize a tank of kero for my turbine. It'd be one heck of a lot lighter then a 20lb bottle of propane. Just add a secondary feed line to the top of the tank where all the propane is at and use that to preheat the engine, then close it and switch to kero... it just seems so very simple and easy to me!

oh, and if you're having flowrate troubles, just drop two bic's in there. Actually, you should just modify one of the adjustable lighters, they can put out a LOT of gas! More then those torches anywho.

[Mike Everman]

Made a little progress yesterday, just waiting on another 90 deg fitting for my u-bend. Pretty nice so far. Had some fun hammering out a 12" long cone of .035 thick, from .87 to 1.4" dia. Sort of rolled, sort of hammered. I'm making a rig for doing that much nicer.

[metiz]

Mike, you probably have mentioned this before somewhere but why is/are your intake(s) in 2 stages going from big to small?

[Mike Everman]

That's the fuel plenum to distribute propane all around the joint where intake tube meets head plate. I posted a video of the fuel injection farther down this thread.

[Viv]

Hi Mike

Sounds interesting is that a derivative of my collar or some thing new altogether?

Viv

[Mike Everman]

The intake tube has a little flare, then a 45 deg chamfer on the outside of that that has been spiral knurled. That then seats on a chamfer in the hole of the head plate, making a hundred or so swirl paths around the intake tube, right at the transition. To match the injection area of the former pocket jet, I calculated an annular slit that would be about .0006" radially, which I didn't think I could achieve considering welding warp, so I did not try. Blowing through the fuel line on both, it cam out notionally a little less pass-through as previous, which was surprising. I thought I'd get more going through there.
I may put a permanent 1/8" Rossco to add a bit inside the intake if I can't over-fuel it.

[hinote]

Mike:

Are you using a stepped transition cone just after the CC--or am I just imagining things?

[PyroJoe]

Yeah, what's up with that step Mike?

(Not much word on the SuperChine how is it going?)

[Graham C. Williams]

Hi Bill and Joe.
Take a look at the Snecma - AS1. For That matter it's not too far from the TYPE06 either. They are probably doing much the same thing.

Very nice bit of work Mike.

Graham

[hinote]

Hi Bill and Joe.
Take a look at the Snecma - AS1. For That matter it's not too far from the TYPE06 either. They are probably doing much the same thing.

Here's another historic precedent--the Ecrevisse B by SNECMA. I drew in the red arrow to clarify.