Cart Shopping Cart My Store Account Orders Downloads Shopping Cart Remove item Thumbnail image Product Price Quantity Subtotal × 2462. Effect of Control Surface Balance on Flutter $20.00 2462. Effect of Control Surface Balance on Flutter quantity $20.00 × 2458. Weighing Errors: Assessed and Controlled $20.00 2458. Weighing Errors: Assessed and Controlled quantity $20.00 Coupon: Apply coupon Update cart Available coupons (Click to apply). Cart totals Subtotal $40.00 Tax $0.00 Total $40.00 Proceed to checkout