Sparey Twin (oz13750)

About this Plan

Sparey Twin. Model aero diesel engine.

Quote: "We Motor Boys often got up to some crazy ideas, and in the year 2000 Ron Chernich and myself decided that we would each make an engine to celebrate what everyone called 'the Millennium'. The little engine known as the Sparey 0.8 [actually 0.64cc] had long been one of my favourite flying engines, and since I fancied the challenge of a twin, then a twin based upon two little Spareys, making just 1.28cc, was my choice. Ron had already built a few little Spareys in 2000 but he had up-sized his to 1cc. Consequently he fell in line with my plans to build a twin, but his was to be 2 x 1cc based on his success with the single.

The big problem with alternate firing in-line twins is the sealing of the two separate crankcase chambers. This was achieved by the use of a split bobbin closely fitted into the case and sealed with twin 'O' rings. The bobbin is shown as an inset in the heading composite image.

My engine was completed and ran nicely though it was a little heavy at 190 gm [6.75 oz] to be a flying engine of just 1.28cc. So it sits on a shelf.

I know not the reason, but although construction of Ron’s engine got to an advanced build, it never seems to have been completed. No photographs exist other than of some of the parts.

Ron’s 2cc version is the one presented in the plans, but the images here are of my own 1.28cc version. The differences are only in the dimensions, all details being the same."

For more on the Sparey Twin engine, see: http://modelenginenews.org/sparey/twin.html

Also see http://www.modelenginenews.org/sparey/ for more background history on the original Sparey diesels.

Direct submission to Outerzone.

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