Weight and balance
Selecting a tail number loads that aircraft’s own station arms, limits, basic empty weight and POH/AFM envelope. Every preloaded value stays editable because equipment and configurations change.
Basic empty weight
N172SP weighing record rev. C, 12 Jul 2026 — oil included
Empty arm (moment ÷ weight)
38.61 in
Oil is included in the basic empty weight for this aircraft.
Loading
Fixed-wing single-engine · station template “Single engine — combined front-seat station”. Arms are preloaded from N172SP’s own POH/AFM loading table and stay editable by an authorized reviewer.
The POH loading table uses one arm (37.0 in) for both front seats, so enter the combined front-seat weight.
Moment = weight × arm · source: N172SP weight & balance record, equipment list rev. C · no published station limit
Moment = weight × arm · source: N172SP weight & balance record, equipment list rev. C · no published station limit
Moment = weight × arm · source: N172SP weight & balance record, equipment list rev. C · station limit 120 lb
Areas 1 and 2 combined are limited to 120 lb.
Moment = weight × arm · source: N172SP weight & balance record, equipment list rev. C · station limit 50 lb
Fuel
100LL aviation gasoline · usable 53 gal of 56 gal total. The conversion factor comes from this aircraft’s data, not a fixed assumption.
| Fuel item | Gallons | × lb/gal | Pounds | Arm | Moment |
|---|---|---|---|---|---|
| Departure fuel | 43.0 | 6 | 258.0 | 48.00 | 12384 |
| Taxi burn | 1.1 | 6 | 6.6 | 48.00 | 317 |
| Planned burn | 12.0 | 6 | 72.0 | 48.00 | 3456 |
Worked example: 43.0 gal × 6 lb/gal = 258.0 lb, × arm 48.00 in = 12384 lb-in.
Profile source
N172SP weight & balance record, equipment list rev. C
Rev. C, 12 Jul 2026 (post avionics installation)
Configured 02 Aug 2026 · verified by A. Whitfield, Chief Instructor
Profile change history
- 12 Jul 2026 — Empty weight updated after GTN 650 installation: 1,684.0 → 1,691.4 lb. (Baypoint Aviation)
- 02 Aug 2026 — Profile reviewed against the aircraft record and marked verified. (A. Whitfield)
Computation
| Item | Weight | Arm | Moment | Moment/1000 |
|---|---|---|---|---|
| Basic empty weight (Rev. C, 12 Jul 2026 (post avionics installation)) | 1691.4 | 38.61 | 65297 | 65.30 |
| Front seat occupants (pilot & front passenger) | 180.0 | 37.00 | 6660 | 6.66 |
| Baggage area 1 | 20.0 | 95.00 | 1900 | 1.90 |
| Fuel at departure (43 gal × 6 lb/gal) | 258.0 | 48.00 | 12384 | 12.38 |
Ramp
2149.4 lb
CG 40.12" · max 2558 lb
Moment/1000 86.24
Calculated point appears inside the configured envelope
Takeoff
2142.8 lb
CG 40.10" · max 2550 lb
Moment/1000 85.92
Calculated point appears inside the configured envelope
Landing
2070.8 lb
CG 39.82" · max 2550 lb
Moment/1000 82.47
Calculated point appears inside the configured envelope
Centre-of-gravity moment envelope — N172SP
POH section 6 centre-of-gravity moment envelope
No weight, station or envelope warnings from the configured profile.
Aero Center does not state that a flight is legal or safe. Verify every value against the current POH/AFM and the aircraft’s own weight-and-balance records before flight.
Saved calculations
N172SP
Dual instruction — 20 Sep, reservation r-14
Calculated point appears inside the configured envelope
Saved by Maya Reyes on 18 Sep 2026 · verify against the current POH/AFM before flight
N4521P
Four adults + baggage — planning exercise
Calculated point appears outside the configured envelope
Saved by Daniel Park on 17 Sep 2026 · verify against the current POH/AFM before flight