Thanks again,

Having built several planes before, I think one of the mentioned planes should be an ok build. In my younger days it was the norm to solder the tank from sheet brass.

I am still a bit in the dark when it comes to performance. We had a tachometer in our club, and I seem to remember our Olivers did in the region of 13,500 - 14,000 static rpm on a 8x6 prop, with approx 15,000 rpm for the quick ones. I never tested my DA then, but I remember from the sound of it that it was not that strong. Maybe 10,300 rpm is an acceptable figure for that engine. I never had any other brands, so I have no knowledge of what would be a weak / strong engine. Also, of course there would be differences between fuel mixes, and the prop brands with similar dia/pitch spec.

Helge.