Keyhole nose surgery complete, now with thin ply bulkhead in place of old thick balsa one, allowing proper screws to be used to achieve 2.5deg each of down-thrust and side-thrust (see pre-Joe Bugner nose photo below), went over to Berinsfield this morning for Round 2 of indoor trimming.
Trimming procedure seemed to be:
1. Get the motor power just right; not easy to accurately adjust such a small and slipperly CO2 cylinder and locking-ring to find that incredibly narrow sweet-spot between too much thrust/rotation of the fuselage and too little power to climb.
2. Set the rudder just right; again very sensitive to find the best position, avoiding either no turn or too much!
3. Steam in a good dose of wash-in by putting the whole inner wing tip into my mouth, breathing and twisting; this method having replaced the acetate trim tab.
By trial and error got some of the way there - better climb with the more moderate down-thrust than before - but still found the initial turn too tight before opening out too quickly, this being the typical result: https://goo.gl/photos/7nVGejpavefSDequ9
Nice bang at the end huh?!
Becoming too much of a habit really!
After which I decided to increase the right thrust a tad, but, because I also started to experiment with a 0.5g bit of tip-weight on the inside wing at the same time (like mixing grain and grape... not a good idea!), the Piet acquired a very drunken flight path, then quickly stalled and smacked its nose hard down onto the ground... so we went home with a very floppy firewall!