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Yeoman Aviation Cropmaster Drawings


The aircraft:

The Cropmaster was a further development of the Kingsford Smith Aviation Services KS-3 Cropmaster (itself an agricultural conversion of the CAC Wackett Trainer), featuring a major redesign and retaining only the steel-tube fuselage frame of the CAC Wackett.

The Cropmaster went through several developments during its service life, the final version featuring an all-metal wing and all-metal empennage.

The drawings:

This set of detailed drawings (originally drafted at 1:48 scale) shows the development of the Cropmaster from its initial YA-1 configuration through to the final YA-250R production version.

A 1:72 version of these drawings was published in Aviation Heritage Vol. 35 No. 1 March 2004 (the Journal of the Aviation Historical Society of Australia)

Plate 1. Side elevations

The first plate shows side elevations of several versions of the cropmaster:

  1. YA-1 Cropmaster 250 (first version with the Wackett trainer empennage, wooden wing and fabric-covered aft fuselage sides)
  2. YA-1 Cropmaster 250 (production version with all-metal wing, all-metal empennage, fibreglass aft-fuselage sides and Lycoming engine)
  3. YA-1B tricycle undercarriage proposal (never constructed)
  4. YA-1 Cropmaster 250R (production version with Continental engine)

Click on the thumbnail at the left to open a PDF file.

Plate 2. Plan view

The second plate shows a plan view of the YA-1 Cropmaster 250 production version as well as several scrap views showing extra details. Click on the thumbnail at the left to open a PDF file.

Plate 3. Structural details
The third plate shows a front elevation of the YA-1 Cropmaster 250 as well as structural details. Click on the thumbnail at the left to open a PDF file.

Plate 4. Side elevations

The fourth plate shows a front elevation of YA-1 Cropmaster 250R (Continental engine) as well as side elevations of several different version:

  1. Yeoman 175, a modified Wackett Trainer used as a test-bed for the new cockpit canopy and all-metal empennage
  2. Yeoman-Hanes 250, a 3-seat modification of the Cropmaster
  3. Yeoman Cropmaster 300, a proposed larger and more powerful version of the Cropmaster which was never constructed

 Click on the thumbnail at the left to open a PDF file.

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Click here for a full description of this license, but in summary it means that you are free to copy, distribute and adapt these drawings on the conditions that you attribute their creation to me and that if you adapt and distribute them you must also license the adapted versions under the same conditions.

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First created 07/01/2012