Xantos,

I cannot answer your question. However, I have seen the Composite Bobcat fly with the Wren Super Sport, giving 18lbs of thrust for the same weight as that standard MKIII engine.

I know this engine uses an advanced diffuser to achieve such, and seeing this combination together, appeared to me to be the ideal composition.

I would suggest you look at this engine, the performance and price quite appealing in my view, and contact Wren directly, to see if they may advise on performance issues in climatic conditions such as yours.

I wonder how the diffused air may be effected by the design in such conditions?

I guess the upside is that is normally sunny to be able to fly in unlike the UK, which just happens to be sunny today!

Gazzer