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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. '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.
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