It is a very good flyer on a Rapier L1 or L2LT but any motor of higher power would cause the wings to flutter hence the carbon fibre additions (which didn’t work) that can be seen in the pic. There is a brief video of Colin Hutchinson‘s model at Old Warden but I don't seem to be able to attach it here! The model has been in storage for a long time, I must have put it away after it got damaged, previously. I had been flying it indoors on a Gasparin G10 pusher on which it was a touch over powered for indoors.
This photo shows Slinki nested with a 16” span Spook for size comparison, incidentally a brilliant L2 flyer that deserved to be more popular, perhaps too good as Steve Bage lost two of them (note to self post the plans on the plans page).
Since 2009 I have partly drawn up a couple of versions developing it a little further but none have actually been modelled yet, however in the last couple of days I have drawn up this scheme below stimulated by the Variante 75 wing that McTschegsn posted on a few days ago to hopefully eliminate the flutter when powered by TSP L1 motors of 150 mN or L2 of 250mN.
Before I build it though I must repair the original Slinki, it will be lovely to see it doing its thing again, it seemed to climb up in steps, no doubt caused by the wings flexing.
I’ve also included a glimpse of the built up version and the clipped wing sporty version (which might have helped prevent the flutter), I should have built years ago, but sadly you can’t do it all. These are attached on the next page.
The Slinki is a typically lovely HM design and one that is worth considering for the new 'one shot' TSP L-1 duration class.
As Howard says, one problem is the flexible wings - it really doesn't like being over powered.
Many years ago I built a Slinki and, to stiffen the all-sheet wings, covered them in tissue. This it did, but at the expense of weight, so its performance suffered.
A built up wing with 'geodesic' ribs may be the answer.