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• Input Parameters

Existing and projected aircraft are modelled via more than 260 parameters. These can be assigned interactively in any order, or loaded from file. A typical aircraft definition uses only around 50 to 60 parameters. If a value changes, Piano executes a re-design iteration automatically as soon as any output is requested. Parameters can be grouped together in convenient 'palettes', and copied / pasted or otherwise manipulated as complete sets. The user can create files of frequently used values to represent (for example) specific fuselage configurations, typical reserve fuel rules, operating cost standards, or any other parameter combinations.

There are three basic types of parameter in Piano:
• 'Vital' (red) parameters (such as wing-area), which are initially unassigned. There are only 15 of these. They constitute the minimum level in a plane's definition.

• 'Defaulted' (black) parameters (such as mass-per-pax). Each of these has a typical value which is used implicitly unless overridden by the user.

• 'Calculable' (green) parameters (such as APU-mass). Various built-in estimation methods are used to determine these (as opposed to fixed values). Alternatively, a direct user input can be supplied.


The following is an alphabetic list of Piano's parameters. They are shown here without explanations, though the meaning of most is still fairly obvious. Full details can be found in the User's Guide.
 aerofoil-clmax
 aerofoil-cm0
 air-condition-mass
 air-traffic-speed-limit
 airframe-$/mass
 airframe-fixed-price-$
 airframe-maintenance-coeffs
 amortization-years
 approach-method
 approach-speed-ratio
 approach-time
 apu-mass
 aspect-ratio
 avionics-mass
 blades-per-propeller
 braking-friction
 break-fraction-definition
 buffet-cl-adjustment
 buffet-mach-adjustment
 buffet-mach-cl-curve
 bypass-ratio
 cabin-aisle-width
 cabin-altitude
 cabin-crew-$/hr
 cabin-floor-location
 cabin-in-front-fuse-fraction
 cabin-in-rear-fuse-fraction
 cabin-is-pressurised
 cabin-seat-pitch
 cabin-seat-width
 cargo-doors-area
 cargo-mass
 cd0-compress.start-mach
 cd0-compressibility-factor
 centresection-is-wet
 climb-schedule-switch-alt.
 compressibility-method
 contingency-definition
 contingency-fuel-fraction
 cost-method
 cruise-cg-position
 delta-cd-due-to-u/c
 delta-clmax-due-to-slat
 design-cruise-altitude
 design-cruise-mach
 design-dive-mach
 design-floor-loading
 design-n-lim
 dihedral-deg
 diversion-altitude-limit
 diversion-distance
 diversion-mach
 diversion-method
 dorsal-fin-height-fraction
 dorsal-fin-length-fraction
 drag-creep-slope
 drag-creep-start
 dry-engine-mass-curve
 electric-systems-mass-fraction
 engine-$/thrust
 engine-failure-reaction-time
 engine-fixed-price-$
 engine-maintenance-coeffs
 engine-pressure-ratio
 engine-type
 eta-flap
 eta-u/c
 eta-wet-wing
 exist-2nd-deck
 exist-slats
 exist-winglets
 fairing-type
 fin-aspect-ratio
 fin-cl-limit-at-vmc
 fin-is-wet
 fin-sweep-deg
 fin-t/c
 fin-tailcone-gap
 fin-taper
 fixed-equipment-cg-fraction
 fixed-polar-name
 flap-chord-fraction
 flap-type
 flight-crew-$/hr
 front-fuse-length
 front-fuse-name
 fuel-density
 fuel-price-$/vol
 fuel-systems-mass
 fuel-vol-adjustment
 furnishings-mass-per-pax
 fuse-depth/width
 fuse-mass-method
 fuse-transition
 fuse-width
 fuse-xsection-type
 ground-handling-rate
 hold-altitude
 hold-mach
 hold-time-mins
 hydraulic-systems-mass-fraction
 ignore-fuel-vol-violations
 ignore-seating-checks
 incidence-correction
 induced-drag-method
 insurance-rate
 interest-rate
 labor-$/hr
 landing-flap-deg
 landing-free-roll-time
 landing-rate
 landing-screen-height
 linked-engine-name
 lowspeed-aero-name
 main-u/c-wheels-per-a/c
 manufacturers-contingency-mass
 mass-per-crew
 mass-per-pax
 mass-per-powerplant
 max-landing-mass-ratio
 max-operating-altitude
 max-payload/design-payload
 mid-fuse-length
 min-static-margin
 misc-systems-mass-fraction
 missed-approach-time
 mto-mass
 mto-origin-mass
 nac-depth/width
 nac-length/width
 nac-location-ahead-of-wing
 nac-location-below-wing
 nac-location-on-fuse
 nac-mounted-on-fin
 nac-name
 nac-specific-mass
 nac-width
 nac<fin>-depth-proportion
 nac<fin>-length-proportion
 nac<fin>-longitudinal-location
 nac<fin>-name
 nac<fin>-vertical-location
 nac<fin>-width-proportion
 nacs-mounted-internally
 nacs-mounted-on-fuse
 nacs-mounted-on-wing
 navigation-rate
 nose-u/c-wheels-per-a/c
 number-of-cabin-crew
 number-of-compressor-stages
 number-of-flight-crew
 number-of-pax
 number-of-shafts
 number-of-windows
 operational-items-mass
 pax-doors-area
 planform-break-fraction
 planform-break-is-wet
 planform-break-t.e.-adjustment
 polar-mod-name
 powerplant-thrust/weight
 propeller-diameter
 pylon-mass-ratio
 ramp-fuel-allowance
 rear-fuse-length
 rear-fuse-name
 reference-thrust-per-engine
 required-fin-vol-coeff
 required-stab-vol-coeff
 residual-value-fraction
 reverse-thrust-fraction
 reverse-thrust-used-for-abort
 reverse-thrust-used-for-landing
 rolling-friction
 roof-top-end
 rr-adjust-compress.coeff1
 rr-adjust-compress.coeff2
 rr-adjust-compress.drag-curve
 rr-adjust-compress.mdiv-curve
 seats-abreast
 skin-friction-method
 slat-chord-fraction
 slat-exp-span-fraction
 span
 spoiler-chord-fraction
 spoiler-exp-span-fraction
 stab-aspect-ratio
 stab-is-wet
 stab-mounting
 stab-sweep-deg
 stab-t/c
 stab-tailcone-gap
 stab-taper
 stepup-cruise-method
 surface-controls-mass
 sweep-deg
 t/c-break/root
 t/c-root
 t/c-tip/root
 tail-mass-method
 takeoff-flap-deg
 takeoff-rotation-check
 takeoff-screen-height
 takeoff-time
 taper
 taxi-in-time
 taxi-out-time
 thickness-break-fraction
 thrust-factor-at-2nd-segment
 touchdown-speed-ratio
 twist-deg
 u/c-length-below-fuse
 u/c-mounted-on
 user-adjust-cl-cd-curve
 user-adjust-mach-cd-curve
 user-cds-increment
 user-factor-on-approach-fuel
 user-factor-on-asymmetric-drag
 user-factor-on-box-mass
 user-factor-on-climb-rating
 user-factor-on-continuous-rating
 user-factor-on-cruise-rating
 user-factor-on-divergence-mach
 user-factor-on-diversion-fuel
 user-factor-on-fin-drag
 user-factor-on-fin-mass
 user-factor-on-flap-mass
 user-factor-on-fuse-drag
 user-factor-on-fuse-mass
 user-factor-on-hold-fuel
 user-factor-on-induced-drag
 user-factor-on-landing-clmax
 user-factor-on-landing-l/d
 user-factor-on-nac-drag
 user-factor-on-sfc
 user-factor-on-stab-drag
 user-factor-on-stab-mass
 user-factor-on-takeoff-clmax
 user-factor-on-takeoff-fuel
 user-factor-on-takeoff-l/d
 user-factor-on-takeoff-rating
 user-factor-on-taxi-in-fuel
 user-factor-on-taxi-out-fuel
 user-factor-on-total-drag
 user-factor-on-u/c-mass
 user-factor-on-windmill-drag
 user-factor-on-wing-drag
 utilization-coeffs
 v2-speed-ratio
 v3-v2-speed-increment
 window-depth
 window-width
 windscreen-depth
 windscreen-frontal-cd
 windscreen-top-fraction
 windscreen-width-fraction
 wing-apex-fuse-fraction
 wing-area
 wing-mass-method
 wing-mounting
 wing-transition
 winglet-cant-deg
 winglet-root-chord/wing-tip-chord 
 winglet-span/wing-halfspan
 xi-front-spar-root
 xi-front-spar-tip
 xi-rear-spar-root
 xi-rear-spar-tip
 xi-sweep

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