# NTSB MKC71FDM36: Bensen B-8M, N2436, Lake Elmo, MN, November 5, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: November 5, 1970
- Place: Lake Elmo, MN · LAKE ELMO, MN
- Location: 44.9879° N, 92.9097° W: Placed by OpenAirDocs: center of Lake Elmo, MN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.9879&lon=-92.9097&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report October 6, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 158910
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC71FDM36
- Page: https://openairdocs.org/ntsb/MKC71FDM36

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4543   70/11/5   LAKE ELMO,MINN      BENSEN B-8M         CR-  0  0  1  MISCELLANEOUS             STUDENT, AGE 28, 49 TOTAL
        TIME - 1600                    N2436               PX-  0  0  0  DEMONSTRATION             HOURS, 0 IN TYPE, NOT
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - LAKE ELMO
        DEPARTURE POINT             INTENDED DESTINATION
          LAKE ELMO,MINN              LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  TAKEOFF: INITIAL CLIMB
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        FACTOR(S)
           PILOT IN COMMAND - LACK OF FAMILIARITY WITH AIRCRAFT
        REMARKS- CERTIFICATION DEMONSTRATION FLT. ACFT FLOWN 8 HRS AS GYRO GLIDER PLUS SEVERAL HIGH SPEED TAXI RUNS
```

## Aircraft

- Registration: [N2436](https://openairdocs.org/deregistered/N2436-2019-01-15), registration cancelled 2019-01-15, S/N BA42670-1VWM, built 1970 (OpenAirDocs)
- Reported make and model: BENSEN B-8M
- Registry model: [Kretsinger BENSEN B8M](https://openairdocs.org/model/kretsinger-bensen-b8m) (registry code 13007H7) (OpenAirDocs)
- Registry engine: [Volkswagen CONVERSION](https://openairdocs.org/engine/volkswagen-conversion) (registry code 63501, reciprocating) (OpenAirDocs)
- Category: Gyroplane, amateur-built
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Lake Elmo

## Other investigations on N2436 (2)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB GAA15CA109](https://openairdocs.org/ntsb/GAA15CA109), Jun 7, 2015: Kretsinger Bensen B8M (N2436), Maple Plain, MN, substantial damage. Probable cause: The pilot's failure to maintain airspeed, resulting in a loss of control, and a collision with terrain.
- [NTSB CHI00LA075](https://openairdocs.org/ntsb/CHI00LA075), Feb 20, 2000: Kretsinger Bensen B8M (N2436), Wayzata, MN, substantial damage. Probable cause: the pilot's poor inflight planning in that he turned into a tailwind which resulted in diminished airspeed. Factors associated with the accident were the tailwind, low altitude maneuvering, the snow…

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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