Grob G 120 weight and balance & performance calculator
The Grob G 120 is a two-seat aerobatic aircraft with fixed tricycle gear and piston engine. BriefingPal has 1 model of the Grob G 120 on file – Grob G 120A – with data from the Pilot's Operating Handbook for weight and balance, takeoff and landing distances, climb and cruise. Free, no sign-up.
* Grob G 120A, MTOW, sea level / 6,500 ft, ISA – details below
Calculate the Grob G 120 weight, CG and takeoff distance
Your own empty mass (weighing report, optional)
The POH has no standard empty moment for this model – enter the empty mass CG from your weighing report to get the CG.
Leave empty to use the typical POH empty mass. Your aircraft's weighing report is what counts.
Calculated on the BriefingPal server from the POH data. Nothing is stored, no cookie. Planning aid only – the POH/AFM and your weighing report are authoritative.
Grob G 120 key figures by model
| Model | Built | MTOW | Empty mass¹ | Usable fuel | Max. baggage | Useful load with full fuel¹ |
|---|---|---|---|---|---|---|
| Grob G 120A | 1999–2012 | 1,490 kg (3,285 lb) | 1,080 kg (2,382 lb) | 66.6 US gal (252 L) | 50 kg (110 lb) | 228 kg (504 lb) |
¹ Typical empty mass from the POH sample loading; your aircraft's current weighing report applies. Useful load = MTOW − empty mass − usable fuel (people, baggage, oil if not included).
Grob G 120 takeoff and landing distance
BriefingPal result at MTOW, sea level, 15 °C, no wind, dry paved runway, normal takeoff and landing per POH with the app's default flap setting, without safety factor:
| Model | Takeoff ground roll | Takeoff over 50 ft | Landing over 50 ft | Landing ground roll |
|---|---|---|---|---|
| Grob G 120A | – | 710 m (2,320 ft) | 590 m (1,940 ft) | – |
Hot and high: at 5,000 ft and 25 °C (density altitude about 7,300 ft) the Grob G 120A needs about 1,270 m (4,160 ft) to clear 50 ft – 79 % more than at sea level. Calculate density altitude →
In BriefingPal you enter your actual weight, airfield, temperature and wind. The app reads the POH charts for these conditions, compares the result with TORA/LDA of the selected runway and can add a 1.15 safety factor.
Grob G 120 climb and cruise performance
| Model | Rate of climb at sea level | Time / fuel to 6,500 ft | Cruise TAS at 6,500 ft | Fuel flow |
|---|---|---|---|---|
| Grob G 120A | 1,190 fpm | 7 min / 2.3 US gal | 133 kt | 10.6 US gal/h (40 L/h) |
MTOW, ISA, default power setting of the POH cruise table. Values change with weight, temperature and the power you choose in the app.
Grob G 120 weight and balance in BriefingPal
Loading stations: seat row 1, baggage compartment, fuel. Maximum baggage: 50 kg (110 lb). Maximum landing mass 1,440 kg (3,175 lb) (Grob G 120A) – BriefingPal checks the landing point after trip fuel against it. Demonstrated crosswind: 25 kt. Best rate of climb speed Vy: 102 KIAS. Service ceiling: 16,800 ft. Fuel: AVGAS.
Crosswind calculator with the demonstrated crosswind of the Grob G 120 →
How to calculate Grob G 120 weight and balance
- Choose the Grob G 120Type the registration or pick Grob → Grob G 120 → your model. Stored weighing data of the registration are used automatically.
- Enter people, baggage and fuelWeights in kg or lb, fuel in US gallons or litres. MTOW and every station limit are checked instantly.
- Check the CG envelopeTakeoff, zero-fuel and landing points are drawn into the Grob G 120 envelope from the POH.
- Add airfields and routeTakeoff and landing distances, climb, cruise and fuel follow from the same weight – then print the briefing PDF.
Grob G 120 – frequently asked questions
What is the maximum takeoff weight (MTOW) of the Grob G 120?
Grob G 120A: 1,490 kg (3,285 lb).
How much usable fuel does the Grob G 120 carry?
Grob G 120A: 66.6 US gal (252 L).
What is the useful load of the Grob G 120 with full fuel?
With the typical POH empty mass and full usable fuel: Grob G 120A: 228 kg (504 lb). Your aircraft's real empty mass is in its weighing report – BriefingPal can store it per registration.
How long is the Grob G 120 takeoff distance?
Grob G 120A at MTOW, sea level, 15 °C, no wind: ground roll about –, over 50 ft about 710 m (2,320 ft). At 5,000 ft and 25 °C it grows to about 1,270 m (4,160 ft). Always check the POH for your exact conditions.
Is there a free Grob G 120 weight and balance calculator?
Yes. BriefingPal is free and needs no account. It covers 1 model of the Grob G 120, draws the CG envelope from the POH and also computes takeoff and landing distances, climb, cruise and fuel – with a briefing PDF.
Data source
All figures come from the manufacturer's Pilot's Operating Handbook / Airplane Flight Manual of each model (weight and balance section and performance section) and are computed with the BriefingPal engine. BriefingPal is a planning aid; the original POH/AFM of your aircraft and its weighing report remain authoritative.
Calculators
Open the Grob G 120 calculator
free · no sign-up · POH data