SCRATCH BUILT WACO YMF 5 RC BIPLANE - MOKI 250cc 5 CYLINDER RADIAL ENGINE - LMA RAF COSFORD - 2022

PILOT / BUILDER / OWNER - GEOFF GRAVES,

A VERY SAD STORY TO THIS MODEL, THE PILOT GEOFF GRAVES EXPLAINED TO ME THAT A CLOSE FRIEND OF HIS CALLED DEREK MARTIN (THE NAME ON THE COCKPIT) DESIGNED AND DREW UP THE PLANS FOR THIS MODEL HIMSELF AND THEN HELPED GEOFF BUILD THE MODEL OVER SEVERAL YEARS,

UNFORTUNATELY DEREK (THE EX CHAIRMAN OF THE HUCKNALL ROLLS ROYCE RC FLYING CLUB) NEVER GOT TO SEE THIS BEAUTY FLY, HE WITNESSED HER BEING PAINTED AND ALMOST READY FOR FLIGHT BEFORE SUCCUMBING TO CANCER,

Role - open-cockpit biplane
National origin - United States
Manufacturer - Waco Aircraft Company
Introduction - 1930
Status - YMF-5 in production (2013)
Primary user - private pilot owners and training schools

General characteristics

Crew : 1
Capacity : 1 trainee or passenger
Length : 23 ft 1 in (7.04 m)
Wingspan : 30 ft 0 in (9.14 m)
Height : 8 ft 5 in (2.57 m)
Wing area : 244 sq ft (22.7 m2)
Empty weight : 1,870 lb (848 kg)
Gross weight : 2,650 lb (1,202 kg)
Powerplant : 1 × Continental W-670-6A seven cylinder radial , 220 hp (160 kW)

Performance

Maximum speed : 128 mph (206 km/h, 111 kn)
Cruise speed : 114 mph (183 km/h, 99 kn)
Range : 400 mi (640 km, 350 nmi)
Service ceiling : 14,800 ft (4,500 m)
Time to altitude : 15 min to 9,000 ft (2,700 m)

Development

The Waco 'F' series of biplanes supplanted and then replaced the earlier 'O' series of 1927/33. The 'F' series had an airframe which was smaller and about 450 pounds (200 kg) lighter than the 'O' series, while continuing to provide accommodation for three persons in tandem open cockpits. A similar performance to the earlier model was obtained on the power of smaller and more economical engines.

The initial models were the INF (125 hp (93 kW) Kinner engine), KNF (100 hp (75 kW) Kinner) and the RNF (110 hp (82 kW) Warner Scarab), all of which had externally braced tailwheel undercarriages. Many further sub-models followed with more powerful engines of up to 225 hp (168 kW). The most powerful in the range was the ZPF of 1936/37, intended for executive use.

Operational history

The 'F' series was popular with private owner pilots for sporting and other uses and continued in production through the late 1930s. The tandem cockpit UPF-7 was adopted by the Civilian Pilot Training Program and continued in production until 1942 by which time over 600 had been built.

The 1934 model YMF was substantially redesigned with a longer and wider fuselage, larger rudder and other structural changes, and put into production in March 1986 by WACO Classic Aircraft of Lansing, Michigan as the YMF-5. Over 150 YMF-5s were completed as of 2017 with new examples being built to specific orders.

The WACO Aircraft Company of Ohio Inc had built three replicas by December 2011, which they designated MF.

Considerable numbers of 'F' series biplanes, both original and newly built, remain in service.

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FILMED AT AN RC MODEL AIRCRAFT SHOW RUN BY THE LMA ( LARGE MODEL ASSOCIATION ) AT RAF COSFORD - SHIFNAL WOLVERHAMPTON - SHROPSHIRE / STAFFORDSHIRE - TF11 8UP IN THE UK
OVER THE WEEKEND OF 2-3 JULY - 2022