Pyramidal Balance

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About Pyramidal Balance

Overview

High-precision external pyramidal balances designed for accurate aerodynamic force and moment measurement in wind tunnel testing. Engineered for reliability and direct measurement output, these systems provide real-time lift, drag, and moment data without complex post-processing.

Available in three sizes (small, medium, and large) and configurable as 3-component or 6-component systems, these balances are ideal for educational, research, and industrial aerodynamic applications.

Key Features

Direct Measurement: Outputs Lift, Drag, Side Force, and Moments directly
3 or 6 Component Configurations Available
High-accuracy load cells for force and moment sensing
Robust Construction: Aluminium, carbon steel, and stainless steel
Modular Design: Compatible with various wind tunnel sizes
Manual or Motorized Pitch/Yaw Control

Measurement Capabilities

3-Component: Lift, Drag, Pitching Moment
6-Component:

Lift
Drag
Side Force
Pitching Moment
Yawing Moment
Rolling Moment

Technical Datasheet (Typical)

Size & Installation

Size	Resolving Center Height	Required Clearance Below Test Section
Small	~0.30 m (12 in)	~0.33 m (13 in)
Medium	~0.41 m (16 in)	~1.17 m (46 in)
Large	~1.02 m (40 in)	~1.02 m (40 in)

Load Capacity (Typical Ranges)

Parameter	Small	Medium	Large
Lift	220 N	1,200 N	1,300 N
Drag	220 N	380 N	530 N
Side Force	220 N	420 N	780 N
Pitch Moment	11 Nm	80 Nm	150 Nm
Yaw Moment	11 Nm	80 Nm	150 Nm
Roll Moment	11 Nm	80 Nm	150 Nm

Design & Construction

Structure: Pyramidal frame with resolving centre geometry
Materials:

Anodized 6061 aluminium
Carbon steel & stainless-steel components

Sensing: High-accuracy load cells on spider and cradle assemblies
Mechanism: Beam, flexure, and rod-based force separation

System Components

Balance spider for moment measurement
Balance cradle for force measurement
Precision flexures and linkage system
Calibration fixtures and first-order calibration matrix

Control Options

Standard: Manual hand-crank pitch/yaw adjustment
Optional:

High-accuracy stepper motor control
Motorized fairing table

Optional Add-Ons

Data Acquisition & Control (DAC) system integration
Automated positioning systems
Custom sizing and load configurations

Applications

Aerodynamic coefficient measurement
Aircraft, UAV, and automotive model testing
Academic and research laboratories
Wind tunnel force calibration studies

Customization

Each balance is individually engineered based on test section size, expected loads, and application requirements, ensuring optimal performance and integration.

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