Yeoman Y.A.1 Projects

Hi,


the Yeoman Y.A.1B and Y.A.1 285 were a projects,developed from Y.A.1 Cropmaster;

A proposed variant with tricycle undercarriage was the YA-1B, none were built. A cut-away drawing of the YA-1B was included in a Yeoman Aviation brochure. The YA-1B design proposal also included an early version of the design for the all-metal empennage, with a more upright tail-fin than was actually produced. Another variant was the YA-1 285 with a 285 hp (213 kW) Continental engine, sources disagree as to whether any of this variant were produced.


http://en.wikipedia.org/wiki/Yeoman_Cropmaster

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Hi,


I don't know if Type 300 was a project or not;

At the time manufacture ceased, metal had been cut on the next evolution, this being the Cropmaster 300. The existing wing was to be retained with the span increased to 37 ft (11.28 m). The tail group was to remain unchanged. The tailwheel configuration was retained although new oleo legs to handle the heavier take-off weight were required. New plastic fuel tanks, still mounted between the front and rear wing spars, were of 21.5 imperial gallons capacity each, giving a total capacity of 43 gallons (195 lit.). Therefore, the practical working endurance remained at two hours or so. The fuselage was an all new design optimized for the topdressing role. The hopper remained in the same position but was of considerably increased capacity. Hopper load on topdressing would have varied between 12 and 17 cwt. (611/865 kg). The area from the hopper to the tail was to be of monocoque construction with an access hatch to permit loading of cargo/work equipment or (no doubt) the odd passenger. The cockpit section forward of the hopper was to be built on a steel tube frame and featured side by side seating for the pilot and a passenger (typically the landholder or the loader driver).

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Yes, the Cropmaster 300 was an unbuilt project. My Yeoman list ...
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Yeoman Aviation Pty Ltd

Yeoman 175 - CA-6 Wackett (s/n 258) conv. VH-AIV, metal empennage, Warner Scarab

YA-1 Cropmaster series 1 - 250hp Lycoming 0-540-A, metal wing, wooden tailplane
- YA-1: Revised CAC CA-6 Wackett fuselage and tailplane, new wings
-- Prototype c/n 101, VH-BJF, flew 15 Jan 1960, aka Kingsford Smith YA-1
-- Cropmaster prototype CofA for 'YA-1 Cropmaster 250', 04 March 1960
-- 5 x Cropmaster series 1 (c/n 101-105), all became Cropmaster 250

YA-1 Cropmaster 250 - 1959, Lycoming O-540*
- Cropmaster 250 Srs 1 - main u/c similar to CA-6 Wackett
-- * Rolls-Royce [Continental] IO-470-G, IO-470-R, or IO-470-E
-- 3 x built as Cropmaster 250 (c/n 106 and c/n 111-112)

YA-1B Cropmaster 250 [Project] 1960, tricycle undercarriage
-- None built

YA-1 Cropmaster 250R - 1967, Rolls-Royce [Continental] IO-470*
-- * Rolls-Royce [Continental] IO-470-G, IO-470-R, or IO-470-E
-- Cropmaster 250R, s/n 119, ZK-CPW - tip extensions (36' span)
- Cropmaster 250R Srs 2 - revised main u/c & mounting points
-- 8 x built as Cropmaster 250R (c/n 107-110, c/n 113-116)

YA-1 Cropmaster 250R series 2 - Revised, fwd-placed main u/c legs
-- 5 x built, c/n 117-121, c/n 120 a 1965 anomoly with Lycoming

YA-1 Cropmaster 260 - [Hypothetical designation]
-- Cropmaster 250R c/n120 re-engined with 260 hp Continental for NZ

YA-1 Cropmaster 285 - [Project] 1964, 285hp Continental IO-520
- Cropmaster 285: Larger hopper, 4" increased wing root chord
-- None built

YA-5B Fieldmaster 285 - [Project] 2-seat,* 285hp Continental IO-520
- Fieldmaster 285: Side-by-side seating, larger overall deriv.
-- None built

Cropmaster 300 - 2-seat (side-by-side) monocoque aft fuselage, span 37'
-- 300 hp engine options, 3-blade propellor
-- None built

Yeoman-Hanes 250 - 1969 3-seat (inline) conv., Lycoming O-540-A
- Yeoman-Hanes 250: Conv. from Cropmaster 250R ZK-CDIs, c/n 110
-- Lycoming O-540-A, 2-blade prop

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Excellent my dear Apophenia.