|Thrust:||50 Newtons (11 lbs)|
|Max revs:||103,000 rpm|
|Temp:||550 deg C|
|Lubrication:||Separate oil tank|
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.
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.
Improvements to the design
- 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.
- 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.
- 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.
- Compressor wheel - There is an alternative to the KKK compressor specified and is made by Holsett. It is detailed in the newsletter.
The book is available from Traplet Publications
ISBN 0 9510589 9 1 Traplet Publications Ltd, Traplet House , Severn Drive, Upton-upon -Severn Worcestershire. WR8 OJL Tel 01684 594505 or fax 01684 594586
PO Box 1121, Sierra Madre, CA 91025-1121, USA.
US tele. no: 626 836 6931
US fax. no: 626 836 6941
144 W. Sierra Bvld, Sierra Madre,CA 91024-2435 USA Tel
201 765 0881