Is this deliberately rigged on the Rans tail-plane ?
The rigging wires firmly hold the outer ends above centre & presumably inhibit them from trying to vibrate above and below neutral. [which could possibly happen if rigged 'dead level'].
A straight edge showed -FW's tail-plane ends ~2 inches higher than at their centre. With a clinometer it read 3 degrees included angle, but not equal side to side, they were uneven.
Repositioning one stay wire tang connection several bolt holes adjustment was tried to try & make both sides rise the same, but the range within the 4 holes was limiting. Tightening and loosening the underside turnbuckles either side didn't help much, so settled for the best compromise with reasonable tensions. Afterwards in a full PFA flight test, 80 vne etc. she felt the same as usual, i.e. perfect. At times in cruise attitude she was holding over 60 in straight & level.
S4 builder Ricky confirms they do have dihedral, the horizontal stabilisers are set 2 degrees off the horizontal
And, yes, as this tailplane isn't quite in line with the wings !
No comments:
Post a Comment