Lycoming O-540-A engine YA-1 Cropmaster 250 S/N 101 VH-BJFbuckmasterfamily.id.au › plans_pdf ›...
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Yeoman Aviation YA-1 Cropmaster 250 and 250R 1959-69 Drawn by Derek Buckmaster © 2003 for the DB Design Bureau website Scale 1:48 Plate 1 of 4 D A C YA-1 Cropmaster 250 S/N 101 VH-BJF (shown in mid-1960 configuration) Lycoming O-540-A engine Hartzell HC92ZK-1 propellor E B YA-1 Cropmaster 250 S/N 106 VH-CYW May 1962 configuration showing single piece blown canopy Lycoming O-540-A engine YA-1 Cropmaster 250R Series 2 S/N 119 ZK-CPW in December 1969 configuration Continental IO-470 engine McCauley D2A36C33/90M-2 or Hartzell HC92ZF-1 propellor (McCauley shown) 1 Metres 2 3 4 Feet 1 2 3 4 5 6 7 8 9 10 11 12 13 26' 6" A B C D E Proposed YA-1B Cropmaster 250 showing tricycle landing gear and early metal tail design (mid 1960). Never constructed. Top view of cowling for Continental IO-470 engine
Transcript of Lycoming O-540-A engine YA-1 Cropmaster 250 S/N 101 VH-BJFbuckmasterfamily.id.au › plans_pdf ›...
Yeoman Aviation YA-1 Cropmaster 250 and 250R1959-69
Drawn by Derek Buckmaster © 2003for the DB Design Bureau website
Scale 1:48 Plate 1 of 4
D
A
C
YA-1 Cropmaster 250 S/N 101 VH-BJF(shown in mid-1960 configuration)
Lycoming O-540-A engineHartzell HC92ZK-1 propellor
E
B
YA-1 Cropmaster 250 S/N 106 VH-CYWMay 1962 configuration showing single pieceblown canopy
Lycoming O-540-A engine
YA-1 Cropmaster 250R Series 2 S/N 119 ZK-CPWin December 1969 configuration
Continental IO-470 engineMcCauley D2A36C33/90M-2or Hartzell HC92ZF-1 propellor(McCauley shown)
1Metres 2 3 4
Feet 1 2 3 4 5 6 7 8 9 10 11 12 13
26' 6"A B C D E
Proposed YA-1B Cropmaster 250 showing tricyclelanding gear and early metal tail design (mid 1960). Never constructed.
Top view of cowling forContinental IO-470 engine
References:1. YA-1 Cropmaster Pilot's Manual2. YA-1 Cropmaster Maintenance & Repair Manual3. Measurements of components of VH-AGL, VH-TPN and VH-ENM at the Australian NationalAviation Museum, Moorabbin.
Acknowledements:These drawings could not have been prepared without Allyn Eckford's support and attentionto detail. Thanks also to Fred Burke, Ben Dannecker, Michael Ellis for contributions commentsand corrections.
Yeoman Aviation YA-1 Cropmaster 2501959-67
Drawn by Derek Buckmaster © 2003for the DB Design Bureau website
Scale 1:48 Plate 2 of 4
Dimensions:Wing spanLengthHeight (tail down)Wheel trackWing areaWing dihedralWing incidence (root)Wing incidence (tip)Wing LE sweepWing chord (root)Wing aspect ratioTailplane span
Control surface deflections:Ailerons:Rudder:All-moving tail plane:
Flaps:
30° up / 15° down27° left / 27° right
23° up / 23° downUp / 20°/ 30°/ 40° down
Plan view of YA-1 Cropmaster 250 S/N 106VH-CYW May 1962 configuration
Plan view showing 3-piece framed canopy used on production aircraft
34 ft26 ft 6 in9 ft8 ft178.5 sq ft5°3.5°0.5°3.8°85 in7.6712 ft 2 in
Wing-tip extensions asfitted to S/N 119 ZK-CPWincreased span to 36'
Some aircraft were operated with nospinner fitted
Port scrap view showing fresh air scoop fitted to some aircraft
Maximum flap deflection 40°
0°
20°30°40°
Aerofoil section at root NACA 2215
1Metres 2 3 4
Feet 1 2 3 4 5 6 7 8 9 10 11 12 13
Starboard scrap view showing flap linkage access paneland venturi for instrument vacuum
Yeoman Aviation YA-1 Cropmaster 250 and 250R1959-67
Drawn by Derek Buckmaster © 2003for the DB Design Bureau website
Scale 1:48 Plate 3 of 4
Front view of YA-1 Cropmaster 250 S/N 106VH-CYW
Instrument panelshown at twicedrawing scale (1:24)
Key to instruments:1 Compass2 Airspeed3 Spray boom pressure (if fitted)4 Altimeter5 Turn & bank 6 Cylinder head temperature7 Manifold pressure8 Tachometer9 Oil & fuel pressure, cylinder head temp.10 Fuses (6)11 Ammeter12 Parking brake13 AWA "Skyphone" VHF radio
Detail of steel tube framework and hopper location
Internal structure of fin and rudder
Internal structure of wings, flaps and ailerons
Continental IO-470-E engine
1Metres 2 3 4
Feet 1 2 3 4 5 6 7 8 9 10 11 12 13
Starboard cockpit controls
Internal structure of all-moving tail-plane
Series 1 landing gearshowing upper mountingpoint attached to main spar
1 2 4 5
6 7 8 9
10
3
1112
13
C o n t i n e n t a lC o n t i n e n t a lC o n t i n e n t a l
Series 2 landing gearshowing upper mountingpoint attached to ribs 3 and 4
Yeoman 175, Yeoman-Hanes 250, Cropmaster 300
Drawn by Derek Buckmaster © 2003for the DB Design Bureau website
Scale 1:48 Plate 4 of 4
Front view of YA-1 Cropmaster 250 S/N 119in December 1969 configuration, showing Series 2landing gear, cowling for Continental IO-470 engineand wing-tip extensions
Yeoman-Hanes 250 S/N 110 ZK-CDI3-seat conversion carried out in 1969
Lycoming O-540-A engine
Yeoman 175 VH-AIV converted from CA-6 Wackett airframe S/N 258 for trials of new all-metal empennage
Warner Scarab engine
McCauley D2A36C33/90M-2 propellor
Power options to 300 hp3-bladed propellor
Proposed Cropmaster 300Featured side-by-side seating, monocoque aft fuselage,37' wingspan, redesigned undercarriage
1Metres 2 3 4
Feet 1 2 3 4 5 6 7 8 9 10 11 12 13
