What Jaka contributed is certainly not rubbish. What is rubbish is the complete disregard and dismissal of the real problem of ground syphoning and the no end of problems it often causes newbies (remember them, this is the beginners forum you know) when first experiencing their first inverted installations. Some of which in some arfs are so badly designed it that it is impossible to avoid "ground syphoning" without modification.

Such dismissals of this very real problem ("ground syponing") does a complete disservice to those who are newbies to inverted installations even ones who are experienced but just never tried inverted installations before.

Perhaps this is why One of the most respected and perhaps argualbly, the manufacturer with very best and most comprehensive owners manuals industry wide (OS), very carefully spell out this tank to spraybar (jet) height relationship and express its importance!

Gentlemen I believe you are both respected and excellent contributors in this forum but this is the Beginers Forum it is not a pylon forum nor is it a giant scale aerobatics forum.