C269 The Argument of the Spot Engine

The Spey actually had a lot of shortcomings. Its acceleration force was less than 10 tons, which was far from what they needed. It was best if the acceleration force could reach 12 tons. It had a large area against the wind, and its high altitude performance had decreased.

However, the Spey was currently the most mature engine that could be obtained!

The word 'mature' was very important