Part 103 Ultralight Calculator
SI
Imp
Imperial
Inputs
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Vehicle type
Part 103.1 has separate weight criteria for powered and unpowered ultralight vehicles.
Powered
Unpowered
Single occupant
Part 103.1 applies to a vehicle used or intended for manned operation by a single occupant.
Yes
No
Recreation or sport only
Part 103.1 applies to recreation or sport use only.
Yes
No
Airworthiness certificate
Part 103.1 requires no U.S. or foreign airworthiness certificate.
No
Yes
Measured empty weight
(W_e)
Measured empty weight before applying the Part 103 powered-vehicle exclusions entered below.
lb
Excluded float weight
(W_floats)
Powered-vehicle empty weight excludes floats under Part 103.1.
lb
Excluded emergency device weight
(W_safety)
Powered-vehicle empty weight excludes safety devices intended for deployment in a potentially catastrophic situation.
lb
Fuel capacity
(V_fuel)
Part 103.1 powered ultralight fuel capacity limit is 5 U.S. gallons.
gal
Full-power level speed
(V_H)
Use calibrated airspeed at full power in level flight.
kt
Power-off stall speed
(V_SO)
Use calibrated airspeed for the power-off stall condition.
kt
Results
Default result
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Failed checks
0
Pass
Also computed
Use checks passed
3
3 of 3
Regulated empty weight
Pass
246.0
lb
Weight limit
254.0
lb
Weight margin
Pass
8.0
lb
Excluded weight
0.0
lb
Fuel capacity margin
Pass
0.50
gal
Max speed margin
Pass
3.0
kt
Stall speed margin
Pass
2.0
kt
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Method notes
4 notes
Powered screen: regulated empty weight = measured empty weight - excluded floats - excluded emergency safety-device weight.
14 CFR 103.1 powered limits checked here: empty weight less than 254 lb, fuel capacity not over 5 U.S. gal, full-power level speed not over 55 kt CAS, and power-off stall speed not over 24 kt CAS.
14 CFR 103.1 unpowered limit checked here: empty weight less than 155 lb.
This is an applicability worksheet only. It is not legal advice, aircraft certification, an airworthiness determination, operating authorization, inspection result or performance approval.
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