No photographs exist of this, but it was virtually the same as the Mk2b, being three 2 litre bottles with stringers and plywood fins.
From nose to tail: A bottle with an abnormally 'shoulderless' shape pointing neck forwards - no nose cone. The middle bottle was the same way round and the aft bottle was, of course, the other way round. The bottles were plumbed together with hose from a disguarded plug-onto-the-taps shower attachment. This particular one will take the pressure, but I doubt there is much to spare.
The fins are 4 mm plywood (again, rubbish) drilled out to save weight and glued to lengths of 3/8" quadrant. These were taped to the bottles with packing tape at the forward end and at the aft were held in with nylon cord. Functional, but not elegant.
This I flew on a number of occasions experimenting with different water fills, culminating with a particularly high flight which resulted in the breakage of all three fins and two stringers. I also noticed that repeated impacts had caused the nose bottle to start to delaminate, so it too was replaced in the Mk2b.
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