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Microturbine DIY Guide

This document provides specifications and design details for the KJ-66 microturbine engine. Some key points: 1. The engine is based on a KKK turbocharger compressor and has a diameter of 110mm, length of 235mm, and can produce up to 50 Newtons of thrust. 2. Materials include aluminum, steel, and stainless steel. The combustion chamber wall is 0.5mm thick stainless steel. 3. Improvements have been made to the combustion chamber design, turbine wheel, shaft bearings, and compressor wheel to increase performance. 4. The KJ-66 design represents a major advancement over previous designs and is capable of reliable operation at 550 degrees

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3K views10 pages

Microturbine DIY Guide

This document provides specifications and design details for the KJ-66 microturbine engine. Some key points: 1. The engine is based on a KKK turbocharger compressor and has a diameter of 110mm, length of 235mm, and can produce up to 50 Newtons of thrust. 2. Materials include aluminum, steel, and stainless steel. The combustion chamber wall is 0.5mm thick stainless steel. 3. Improvements have been made to the combustion chamber design, turbine wheel, shaft bearings, and compressor wheel to increase performance. 4. The KJ-66 design represents a major advancement over previous designs and is capable of reliable operation at 550 degrees

Uploaded by

Luzsitibi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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KJ66

KJ-66 micoturbine

Specification
Diameter 110mm
Length 235mm
was 33 Newtons, now
Thrust
50 (11 lbs)
Max revs 103,000 rpm
Temp 550 deg C
Weight 1.140 KG
Lubrication Separate oil tank

Design
The KJ-66 engine around a KKK turbocharger compressor No 2018. This has 2 advantages, the compressor is
readily available in reasonably well balanced condition and it can withstand higher rpm than it will encounter
in the engine. The construction is similar to the FD3 64 except that all materials are metal. The turbocharger
revolves in a clockwise rotation and this means that then securing nuts for the shaft are left hand thread. In the
book Thomas described the way to make a hollow shaft. Though an elegant solution to weight and strength it
is difficult to make. The outer can is fabricated but with some ingenuity the same gas cylinder that is used for
the FD3 64 could be used.
This engine represents major advance over the FD3 64 and has been further developed to produce 50 Newton
thrust (11 lbs). It will run reliably with the revised chamber at a temperature of 550 deg C or cooler.

1 of 3 masterplans
KJ66

Materials
The whole of the front of the engine is aluminium. The diffuser vanes are made separately and glued in place
with epoxy glue. The front cover could be spun aluminium or turned from solid aluminium. The main shaft is
made from tough steel to UK spec EN24T. This is in hardened condition and must be accurately turned
between centres or precision ground. The NGV assembly and the rear cone is Stainless steel to UK spec 316
or 310.

The combustion chamber is also of the same material but .5mm thick. The bearings are 22mm x 6mm with
8mm bore ISO 608 C3 spec for the front bearing and 16mm x 6mm with 8mm bore for the rear.

Turbine wheel
This differs from the FD3 64 and is made from 6mm thick stainless steel. It has a hole through the boss and is
secured with a left hand thread nut. The blades are twisted and profiled by hand as in the FD3 64

2 of 3 masterplans
KJ66

Improvements to the design


1. The Combustion chamber - Thomas has revised the chamber to feed the fuel in from the rear of the
chamber via slightly bent sticks. The rest of the chamber design is as in the book and drawings are
available in the back copies of the newsletters. The fuel can be fed from the front of the engine to a
circular manifold at the rear. Separate gas and fuel feeds are now usually fitted.
2. Turbine wheel - The turbine wheel has been revised from the original twisted stainless steel wheel. The
best results come from the cast Inconel wheels of Jesus Artes. However revised drawings for the home
ground wheel are also available in the newsletter and they produce a big improvement in thrust.
3. The shaft bearings and bearing tube - The bearings in the book are not preloaded. Angular contact at all
times with the raceways is not maintained. Thomas has issued drawings in the newsletter of a new shaft
tube with preloaded bearings made of aluminium and fitted with the same large bearing used in the
front bearing.
4. Compressor wheel - There is an alternative to the KKK compressor specified and is made by Holsett. It
is detailed in the newsletter.

Kamps Micro turbine


This is a well thought out design and with the latest mods is capable of a performance better or equal to many
of the commercial designs for a fraction of the cost. The combustion chamber is particularly good and can
produce the low EGT temperatures that we like to see. The availability of cast turbine wheels and off the shelf
compressors makes it possible for most to construct a successful engine. Parts are now available and
derivative engines are being developed..

3 of 3 masterplans

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