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Here are some more figures. They show the modifications from schrecklings original design, this is however a direct replacement, no modification to the plans are necessary.

I am currently engaged in the study of Schrecklings FD3/64 turbojet compressor. On my quest I have found some interesting things that I thought I would share.

My goal is to cast a shrouded compressor in A356-T6 using the green sand casting process. Upon simulation I have found that Schrecklings ...

I am in need of some help; I want to design a convergent divergent nozzle. I was wondering if someone can help me with the math to do so. I am specifically wanting the angles required to get a good expansion. Without the shocks. any help?

to start

chamber pressure = 150 psi

throat diameter = 1/4 ...

any ideas about how to estimate the max speed of a compressor of this shape?

Hi Racketmotorman

It seems to me that the relationship between the inlet area A2 and outlet area A1 is simply to match the inlet velocity (correct me if I am wrong) against the outlet velocity.

Where A2 is the inlet area, A1 is the outlet area, Vi is the inlet gas velocity, and o is the increase ...

here is a rendering of my current designe I think I am going to change the inducer angle.

Ha! seems it is pretty common to blame our childhood for our selves huh!
:lol:

I am planning to put allot of work into this thing and was wondering based on your experience, what compression ratio should I go for? It would be nice if the thing would run but I wouldn’t mind if it performed either.

Ash,

that is my intent, I don’t plan on making it easy on myself, I want a really challenging casting project, I will also construct my turbine wheel using forged inconel blades and a ss hub using a Christmas tree attachments. The hardest part for me at this point now that I have a good rule of ...

Racketmotorman,

There is more to life then just accepting things, for instance people in this forum are not excepting the fact that it is extremely not economical to build a jet engine when you can buy one for less of a headache, not to mention the fact it would probably be allot better then the ...

what is the reasoning behind the rules of thumb outlined? I can respect a good rule of thumb but I am more curios then that. I have Kamps book and Schrecklings book but they dont have allot of info on the subject.

see I am thinking about things like this:

V = Volume
D = Mean Diameter of ...

I am designing a compressor wheel much like Kurt Shreckling but I have a few questions that might be answered here. First I will describe the project.

The wheel will be about 9 inches in diameter with retro curve impellers. I will cast a few of them in different configurations for my experiments ...

Jason,

Casting a fan out of aluminum should not be very difficult. The surface should even improve flow separation. All it would take is some meticulous molding but should not be much of a problem.

To make the pattern:

1 start with a disk of plywood or MDF (the thickness that the finished blades ...

here is a pic of the XLS spreadsheet that I have been working on to calculate the streangth of the compressor wheel I am planing on constructing. I would be willing to share the spreadsheet if anyone wants it.

spot weld? hmm. do you mean weld the ends of the pins or actualy spot weld the blads on usind a "L" at the root of the blad. I like the idea of welding the ends of the pins that way I could possibly make it flush.

I think I will try making a few simple renditions of a compressor, do a distructive ...