Diamond DA40 Weight and Balance Calculator
Diamond DA40 sample loading data (N566DS aircraft record with AFM DA 40 station arms): empty weight 1757 lb at 96.7 in. Station arms — front seats 90.6 in, rear seats 128 in, baggage 143.7 in, fuel 103.5 in. Forward CG limit rises from 94.5 to 97.6 inches above 2161 lb; aft limit 100.4 in; maximum weight 2646 lb. Sample data varies by serial number — these figures are a training reference, never a substitute for your aircraft's approved records.
Diamond DA40 Weight and Balance Calculator reference last updated · reference source
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Dated static reference; no live data is fetched. Verify current source values and assumptions before relying on results.
What this tool does
Diamond DA40 sample loading data (N566DS aircraft record with AFM DA 40 station arms): empty weight 1757 lb at 96.7 in. Station arms — front seats 90.6 in, rear seats 128 in, baggage 143.7 in, fuel 103.5 in. Forward CG limit rises from 94.5 to 97.6 inches above 2161 lb; aft limit 100.4 in; maximum weight 2646 lb. Sample data varies by serial number — these figures are a training reference, never a substitute for your aircraft's approved records.
How to use the Diamond DA40 Weight and Balance Calculator
- Check Stations: name, weight lb, moment arm inches (one per line): Empty aircraft (N566DS aircraft record with AFM DA 40 station arms),1757,96.7 Front occupants,340,90.6 Rear occupants,0,128 Baggage,20,143.7.
- Check Fuel onboard (US gallons): 30.
- Check Fuel density (lb/US gallon): 6.
- Check Fuel moment arm (inches): 103.5.
- Check Entered minimum CG (inches): 94.5.
- Check Entered maximum CG (inches): 100.4.
- Check Entered maximum weight (lb): 2646.
- Review the Diamond DA40 Weight and Balance Calculator result and its exact-value comparison table.
- Verify assumptions before applying the result.
Formula
weight=sum station weights+fuel gallons×density; moment=sum(weight×arm); CG=total moment/total weight
- stations
- Stations: name, weight lb, moment arm inches (one per line)
- fuel
- Fuel onboard (US gallons)
- density
- Fuel density (lb/US gallon)
- arm
- Fuel moment arm (inches)
- minCg
- Entered minimum CG (inches)
- maxCg
- Entered maximum CG (inches)
- maxWeight
- Entered maximum weight (lb)
Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
Worked example
Diamond DA40 Weight and Balance Calculator: Stations: name, weight lb, moment arm inches (one per line) = Empty aircraft (N566DS aircraft record with AFM DA 40 station arms),1757,96.7 Front occupants,340,90.6 Rear occupants,0,128 Baggage,20,143.7; Fuel onboard (US gallons) = 30; Fuel density (lb/US gallon) = 6; Fuel moment arm (inches) = 103.5; Entered minimum CG (inches) = 94.5; Entered maximum CG (inches) = 100.4; Entered maximum weight (lb) = 2646. Diamond DA40 sample loading data (N566DS aircraft record with AFM DA 40 station arms): empty weight 1757 lb at 96.7 in. Station arms — front seats 90.6 in, rear seats 128 in, baggage 143.7 in, fuel 103.5 in. Forward CG limit rises from 94.5 to 97.6 inches above 2161 lb; aft limit 100.4 in; maximum weight 2646 lb. Sample data varies by serial number — these figures are a training reference, never a substitute for your aircraft's approved records.
Inputs
- Stations: name, weight lb, moment arm inches (one per line)Empty aircraft (N566DS aircraft record with AFM DA 40 station arms),1757,96.7 Front occupants,340,90.6 Rear occupants,0,128 Baggage,20,143.7
- Fuel onboard (US gallons)30
- Fuel density (lb/US gallon)6
- Fuel moment arm (inches)103.5
- Entered minimum CG (inches)94.5
- Entered maximum CG (inches)100.4
- Entered maximum weight (lb)2646
Result
- Within reference envelope?Within reference limits — verify current aircraft POH
- Total weight (lb)2,297
- Total moment (lb-in)222,209.9
- Center of gravity (inches)96.74
- Weight-dependent forward CG limit (inches)95.37
Diamond DA40 sample stations and envelope
| Reference | Value |
|---|---|
| Record | N566DS aircraft record with AFM DA 40 station arms |
| Empty weight lb | 1757 |
| Empty arm in | 96.7 |
| Front seats arm in | 90.6 |
| Rear seats arm in | 128 |
| Fuel arm in | 103.5 |
| Baggage arm in | 143.7 |
| Maximum weight lb | 2646 |
| Aft CG in | 100.4 |
Results explained
- Within entered rectangular limits?
- Within entered rectangular limits? from the formula above. Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
- Total weight (lb)
- Total weight (lb) from the formula above. Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
- Total moment (lb-in)
- Total moment (lb-in) from the formula above. Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
- Center of gravity (inches)
- Center of gravity (inches) from the formula above. Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
Frequently asked questions
The published sample: 1757 lb at 96.7 in (N566DS aircraft record with AFM DA 40 station arms). Your aircraft's empty weight and arm will differ — sample data varies by serial number and equipment.
At arm 103.5 inches; 30 US gallons at the entered 6 lb/gal adds 180 lb and 18,630 lb-in of moment.
2646 lb in the sample data used here. Confirm the limit for your model year and serial number in the POH/AFM limitations section.
Yes in the reference data: 94.5 inches up to 2161 lb, rising linearly to 97.6 inches at 2646 lb. The aft limit is 100.4 inches.
No. This is a sample-data training reference, not flight authorization. Use your aircraft's current approved loading records, the full POH/AFM limitations, seat positions, fuel and performance checks before flight.