制作涡喷发动机(5)

如何制作涡轮

The early wheels are made from sheet that is slit and twisted to the correct angle and profiled by hand minigrinder. Better wheels can be ground from thick discs. This is time consuming but will give better results particularly with Inconel. Cast Inconel wheels are becoming available now for those that do not feel they have the skill to make one.

Are the engines noisy?

If you stand close to a gas turbine you will find the noise level greater than a piston engine. However in the air the noise is dissipated so that it is much less obtrusive than a piston engine. Indeed if a piston engine and a turbine are flying together it is difficult to hear the turbine at all.

How do I weld stainless steel?

如何焊接不锈钢

This is not a skill everyone can acquire. Thin stainless can be spot-welded so this covers the combustion chamber. The NGV assembly will require TIG welding. TIG sets are expensive and it may be necessary to find a specialist welder used to welding stainless steel to do the welding for you.

What instrumentation will I need?

At the very least when testing you will need a vacuum gauge that can measure up to 1 bar and a temperature gauge that can measure up to 1000deg C. A kitchen scales will provide thrust measurements. A rev counter can be made from the design in the newsletter. It is helpful also to be able to measure the fuel pump pressure but this needs a scale up to 3 bar.

What thrust will I get?

推力是多大？

This depends on the design that you make. The detailed specification is set out in the pages for each design but you can expect to get between 5.3lbs and 16.6 lbs.

How much will it cost?

做涡喷的费用是多少？

This will depend on how able you are to get scraps from you local welders/machine shop! The Schreckling FD3 64 is very cheap to build and would cost probably no more than ￡100. The