Leffler-MacFarlane LM-1
{{Short description|American glider}}
{{Use mdy dates|date=January 2022}}
{{Use American English|date=January 2022}}
| {{Infobox aircraft begin
| name=LM-1 | image= | caption= }}{{Infobox aircraft type | type=Glider | national origin=United States | manufacturer= | designer=Al Leffler, Walt MacFarlane and Bill Meyer | first flight=November 1963 | introduced= | retired= | status=Production completed | primary user= | more users= | produced= | number built=one | developed from= | variants with their own articles= }} |
The Leffler-MacFarlane LM-1 is an American mid-wing, single-seat, FAI Open Class glider that was designed and constructed by Al Leffler, Walt MacFarlane and Bill Meyer, first flying in November 1963.Rogers, Bennett: 1974 Sailplane Directory, Soaring Magazine, page 45. Soaring Society of America, August 1974. USPS 499-920{{Cite web|url = http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=9646Z|title = Make / Model Inquiry Results N9646Z|accessdate = 3 August 2011|last = Federal Aviation Administration|authorlink = |date=August 2011}}
Design and development
The LM-1 was built using a modified wing from a Laister-Kauffman TG-4. The wing retains its original wood and doped aircraft fabric construction, its {{convert|50|ft|m|1|abbr=on}} span as well as the use of a NACA 4418 airfoil at the wing root, transitioning to a NACA 4409 at the wing tip. The newly designed fuselage is made from welded steel tube and fiberglass. The landing gear was originally a retractable dual-wheel hydraulic arrangement, that was replaced with a more conventional retractable monowheel from a Schreder HP-14.
The aircraft was registered with the US Federal Aviation Administration in the Experimental - Amateur-built category. Only one was ever constructed.
In 1974 it was reported that plans were underway to create a new {{convert|56|ft|m|1|abbr=on}} span wing for the LM-1, that would feature a Wortmann airfoil.
Operational history
Specifications (LM-1)
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|wing area sqft=166
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|aspect ratio=15:1
|airfoil=root: NACA 4418, tip: NACA 4409
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|empty weight lb=693
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|gross weight lb=880
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|glide ratio=30:1 at {{convert|45|mph|km/h|0|abbr=on}}
|sink rate ms=
|sink rate ftmin=162
|sink rate note= at {{convert|43|mph|km/h|0|abbr=on}}
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|wing loading lb/sqft=5.5
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