TECHNICAL NOTE, ANALYSIS OF TYPE 5 IJN TORPEDO FIRE CONTROL COMPUTER

Introduction

This paper analyzes the Type 5 IJN Torpedo Fire Control Computer. The analysis is abbreviated, but does cover the key points.

Analysis

Velocity Triangle Derivation

Original Diagram

Visio Diagram

Figure 1: Velocity Triangle Used to Analyze the Type 5JN Torpedo Fire Control Computer

Application of the law of sines to Figure 1.

From Original US Navy Work

Range Triangle Derivation

Original Diagram

Visio Diagram

Figure 2: Distance Triangle Used to Analyze the Type 5JN Torpedo Fire Control Computer

We Apply the Law of Sines The Range Triangle.

Worked Intercept Calculation Example

Range to target

Function of the gyro angle

Angle on the Bow

Bearing angle

Experimental torpedo constant

Experimental torpedo constant

Torpedo speed

Target speed

Starting value for gyro angle calculation

Bearing Tracking

References/Attached Documents

Reference 1

Key US reference on Japanese torpedo fire control during WWII.

Reference 2

Figures Used in this note.