NTSB CAROL · Event
Event DEN91DQA01
Registry · N51DY
FAA Aircraft Registry record.
Make / Model
PAPA 51 LTD CO THUNDER MUSTANG
Year of manufacture
2005
Engine
AMA/EXPR UNKNOWN ENG
Seats / Engines
2 seats · 1 engine
Last airworthiness date
20050827
ADS-B equipped
Yes — Mode-S A65F78
Registrant of record
NURYA LLC
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
PARTIAL LOSS OF ENGINE POWER FOR AN UNDETERMINED REASON, IMPROPER PLANNING/DECISION BY THE PILOT, AND THE PILOT'S FAILURE TO MAINTAIN ADEQUATE AIRSPEED, WHICH RESULTED IN AN INADVERTENT STALL.
Factual narrative
ON THE FIRST FLIGHT OF AN EXPERIMENTAL HOMEBUILT AIRCRAFT, THE PILOT TOOK OFF WITH WHAT NUMEROUS WITNESSES DESCRIBED AS A ROUGH RUNNING ENGINE. THE FLIGHT PATH AFTER TAKEOFF WAS A PATTERN FOR A RETURN TO LANDING FLOWN AT LESS THAN NORMAL PATTERN ALTITUDE. DURING THE TURN TO FINAL, THE AIRCRAFT WAS OBSERVED TO STALL AND ROLL AT APPROXIMATELY 100 FEET ABOVE GROUND LEVEL FOLLOWED BY A STEEP IMPACT. THE AIRCRAFT WAS EXTENSIVELY DAMAGED BY IMPACT AND GROUND FIRE. NO REASON WAS FOUND FOR THE APPARENT LOST OF POWER. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1990_DEN91DQA01.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (stall). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- NASA NTRS 2026 · Conference Paper
Computational Analysis of Steady State Aerodynamics of Transonic Truss-Braced Wing Configuration in Deep Stall
This study presents a computational investigation of steady state aerodynamics of the Subsonic Ultra-Green Aircraft Research (SUGAR) Transonic Truss-Braced Wing (TTBW) configuration over a wide range …
- arXiv 2023 · arXiv preprint
Automating Bird Diverter Installation through Multi-Aerial Robots and Signal Temporal Logic Specifications
This paper tackles the task assignment and trajectory generation problem for bird diverter installation using a fleet of multi-rotors.
- arXiv 2023 · arXiv preprint
Variation of Critical Crystallization Pressure for the Formation of Square Ice in Graphene Nanocapillaries
Two-dimensional square ice in graphene nanocapillaries at room temperature is a fascinating phenomenon and has been confirmed experimentally.
- arXiv 2023 · arXiv preprint
Polycrystallinity enhances stress build-up around ice
Damage caused by freezing wet, porous materials is a widespread problem, but is hard to predict or control. Here, we show that polycrystallinity makes a great difference to the stress build-up process…
- arXiv 2022 · arXiv preprint
Enhanced Prediction of Three-dimensional Finite Iced Wing Separated Flow Near Stall
Icing on three-dimensional wings causes severe flow separation near stall. Standard improved delayed detached eddy simulation (IDDES) is unable to correctly predict the separating reattaching flow due…
- Embry-Riddle Scholarly Commons 2021 · Journal article (JAAER)
Analysis on the Negative Emotional, Physiological, and Cognitive Responses Elicited from of the Activation of a Stall Alarm
Failing to identify an aerodynamic stall can lead to the inability of an aircraft to sustain flight. To warn pilots of an impending or fully-developed stall, many aircraft have safety devices installe…
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