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Statement of Work

Proposals with a statement of work are normally prepared in cooperation with the prospective client. Your proposal will include cost and calendar schedule and are based on estimated man-hours per task.

DARcorporation's success as a leading provider of contractual technical services usually results in long-term partnerships that go far beyond the initial assignment. A typical design and analysis task will include:

  • Sizing of the airplane to a given mission specification.
  • Continue work on definition of the following parameters: Take-off Weight, Empty Weight, Mission Fuel Weight, Take-off Power, Wing area and Maximum Lift Coefficients. Class I Drag.
  • List comparative airplanes with similar mission performance:
    • Overall Configuration Selection
    • Fuselage Layout
    • Propulsion System Integration
    • Wing and Empennage Planform Parameters
    • Type and Size of High Lift Devices
    • Landing Gear Type
    • Class I Weight and Balance
    • Preliminary arrangement drawings
    • Class I Stability and Control
    • Iterations on weights and L/D
  • Dimensioned Three-view Drawings
  • Major Systems. General system arrangements and location in the airframe.
  • Landing gear tires and struts sizing. Verification of landing gear disposition.
  • Initial structural arrangement drawings
  • V-n diagrams
  • Class II weight calculations with center of gravity locations.
  • Engine inclination determination
  • Calculation of hingemoment derivatives and coefficients for elevator, aileron and rudders. Elevator, rudder and aileron sizing, including horn balance and tabs.
  • Lift versus angle of attack curves for power-off, power-on, clean, take-off and landing condition.
  • Verify trimmed maximum lift coefficients for the defined flight conditions and flap size verification.
  • Calculation of zero angle of attack pitching moment, lift coefficients and stability & control derivatives for the defined flight conditions at forward and aft center of gravity.
  • Trim diagrams for the defined flight conditions.
  • Stick force, stick-force-gradients and stick-force-per-g gradients for the defined flight conditions at aft and forward center of gravity. DARcorporation will determine whether down-spring and/or bob-weight installation are required. Where necessary, design adjustments will be suggested. Lateral-Directional trim. Control forces will be calculated for different flight conditions for several different bank angles and sideslip angles. Control forces will be compared with applicable FAR regulations.
  • Class II (detailed) drag calculations for several flight including power effects:
  • Performance calculations for:
    • Cruise (maximum speed, range, endurance and payload-range diagram)
    • Climb (Rate of climb)
    • Take-off
    • Landing
    • Stall speed
    • Maneuver
  • Dynamics:
    • Calculation of the moments of inertia of the airplane at three different weights.
    • Determination of the longitudinal and lateral-directional transfer functions of the airplane.
    • Calculation of the damping ratios, frequencies and time constants of the airplane, compare with FAR requirements. This will determine short period, phugoid, spiral, roll and dutch-roll behavior.
    • Where necessary, design adjustments will be suggested.
  • Preliminary layout drawing for all essential airplane systems.
  • Preliminary manufacturing breakdown
  • List maintenance and accessibility requirements.
  • Preliminary cost analysis
  • Detailed loads analysis
  • Detailed structural design
  • Wind tunnel testing and program management

The DARcorporation Advantage

Experience in the design, detailed analysis and building of prototypes gives DARcorporation a unique advantage over other companies, since we can go from initial design all the way through full size manufacturing. The unique tools we developed for design and analysis make DARcorporation the best choice for any new or existing aeronautical project. DARcorporation engineers can advise on what the best materials are for your design and what the best configuration is. We will work with you to design and optimize your aircraft for performance, manufacturability and cost.

Proposal & Rates

Please Contact Dr. Willem Anemaat for additional information or a detailed proposal. Your detailed proposal will include cost and calendar schedule and estimated man-hours per task. This will be provided at no cost or obligation.

Sample Projects:

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