Cart Shopping Cart My Store Account Orders Downloads Shopping Cart “12. Weight Control – Aircraft Design Problem” has been added to your cart. Continue Shopping “30. The Effect of Center of Gravity on Performance” has been added to your cart. Continue Shopping Remove item Thumbnail image Product Price Quantity Subtotal × 10. Calculation of Landing Gear and Hydraulic System Weights $20.00 10. Calculation of Landing Gear and Hydraulic System Weights quantity $20.00 × 12. Weight Control - Aircraft Design Problem $20.00 12. Weight Control - Aircraft Design Problem quantity $20.00 × 30. The Effect of Center of Gravity on Performance $20.00 30. The Effect of Center of Gravity on Performance quantity $20.00 Coupon: Apply coupon Update cart Available coupons (Click to apply). Cart totals Subtotal $60.00 Tax $0.00 Total $60.00 Proceed to checkout