StillSmart

Thanks for your help YHB, I agree and I will spend some time getting to grips with it before making any drastic mods, I will alter my lower slant plate as you suggested, I will also modify my output tube to return takeoff back down the colum while the column equibrilates, everything you say makes perfect sense and I look forward to your "how to drive a BOK" with great anticipation, im sure it will be well recived by everyone who reads it