One airplane with 5 mm slack at elevator T.E. wouldnt groove with slack removed .
Resloping to 3 . 5 mm improved it but inadequate . Tho C.G. was 3/4 rear of plan posn for that wing . . .
Flap movement afore elevator effectiveness , effectively meand wing alters A.O.A.
The T.E. of the flap going down raises A.O.A. etc .
This plane was flown in wind a lot , the pitching or balooning into wind , and dropping downwind was most
noticable with the slop removed , basically it'd ossilate and overcontrol .
Seeing I'd been flying it for 6 months ( 100 Flights ) prviously with no flight / control issues
before Id got motivated to ' repair ' the sloppy fittings ( Light bike spokes used for dual horns )
It proved out ' the theory ' Particularly when two weeks latter I dissasemble it and reamed out
the horn bushes Id Fitted . After reinstallation one horn had tightened up a bit. So 3.5 one side ,
5 mm the other .
When there was a good steady breeze trying to push the marginally powered plane about , the effects
became abundantly evident .I waited for the slack to increase ( the angled spoke end at the head was responsable .
0 It Didnt .
Had been using FSR 25 clone , threw a OS 35 in to pull C.G. Fwd .
It was a lighter steering more accurate plane with the equvilant of the ' dead zone ' functioning .
My presumption is that the small subconcious corrections for wind , with the altering of wing lift
compensateing, give much smoother flight .
Same plane , same C.G. , same engine , etc , was a touchy pig of a thing in comparison,
Would not ' point ' and ' groove ' as it had earlier , noticable particularly in manouvres
with the coastal sea breeze in the sailing season
makeing flying a irratateing and fustrateing waste of time .
You can immagine how P'd off I was after correcting back to ' almost as was ' provided
provided further exercisses of marginal accuracy under all conditions .
Also allignment of both elevators provided evidance of roll moment induced by unequal centering .
So , I presume C.G. and the dreaded slack zone are directly related .
' Nothing but FUN . ! .