Schreckling compressor study

[lilrex]

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 design is quite hard to beat!

A description of A356-T6 strength:

Ultimate tensile strength: 234MPa (34000 psi)
Tensile yield strength: 165MPa (24000 psi)
Modulus of elasticity 72.4GPa (10500000psi)

I chose this material because it has good strength, and it is readily available.

Schreclings compressor has a useful rotational speed of 75000 rpm and has survived 90000 rpm. My design even though it has been modified for strength while possibly sacrificing optimum inlet geometry, has a 1:1 safety factor at 70000 rpm.

There is definitely something to be said about a plywood constructed compressor!

The attachments are as follows:
a cutaway at the plane of maximum stress, strain deformation, and Factor of safety plot

[lilrex]

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.

[Mike Everman]

Nice work. Yeah, lightness is key. And the carbon fiber wrap, too.