PDA

View Full Version : horizontal stab off kilter


thexfiles
Mar 30, 2004, 02:41 PM
i recently rebuilt a crashed goldberg chipmunk.
i married a wing from one plane with the fuselage of another.
the tail feathers were attached to the salvaged fuselage that i got from a friend.
i wasn't paying attention to the horizontal stab until i mounted the wing and noticed the stab was not mounted to the fuselage correctly, that is, the right side of the stab was closer to the wing than the left side when aligned with the wing. i would say, the offset is about 2-3%.
what affect will this have on the performance of this plane.
the chipmunk was one of my favorite planes and if i have to remove the stab to overcome any problems that might occur i would do it.
thanks for your help.

BMatthews
Mar 30, 2004, 03:56 PM
Hmmm... 2 or 3% is not really a valid description so I'm not really sure how far out it is. If you mean degrees then it's fine. A pattern contest flier may notice the difference but for sport flying it's not a biggie. Technically there will be a slight rudder coupling effect but with such a small angle I seriously doubt you'll notice.

This is assuming that it is actually flat to the wing viewed from the front but skewed when looking down from the top by the 2 or 3 degrees.

thexfiles
Mar 31, 2004, 01:32 AM
hi;
thanks for your reply.
sorry about the typo.
i did not mean %. i meant degrees of the centre line looking down at the fuselage.
on a flat plane the stab and wing are in line.
bill

Bruce Abbott
Mar 31, 2004, 06:04 AM
Like this?

http://www.dfrc.nasa.gov/gallery/photo/AD-1/Small/ECN-13302B.jpg

thexfiles
Mar 31, 2004, 11:30 AM
g'day bruce;
that's a lot more than 3 degrees.
but if you think of the horizontal stab as skewed that way, then we have the picture.
BTW, the rudder is in line with the centre line.
bill