I've seen the following withstand some pretty scary launches:
http://www.charlesriverrc.org/articles/bubbledancer/PDFs/htail_V2.pdf
and especially this construction, tho you'd have to scale it up:
http://www.charlesriverrc.org/articles/allegrolite2m/Allegro_Lite.pdf
http://www.charlesriverrc.org/articles/allegrolite2m/tailconstruction.htm
You've probably seen THIS construction take some heavy loads:
http://www.charlesriverrc.org/articles/supra/all%20PDFs/supra_stab.pdf
You'll have to work out the joiner boxes yourself.
I don't recall the name of it, but the following should come up between
0.3 and 0.6, probably, on a conventional configuration. The lower end of
the scale is good if a long tailboom gives you more damping.
(stab area X stab moment)/(wing area X avg chord)
Where stab moment is from AC of wing to AC of stab. You don't have to be
TERRIBLY precise here, unless the aspect ratio is low.
I just checked out a few Drela designs. The two poly designs came out
around 0.30 to 0.33, the two normal aileron/flap ones at something like
0.37, and the Supergee 2 DLG at 0.47 or something. Remember that's with
a relatively long tailboom.
We are getting to the season where it's easy to dewarp epoxy tails, at
least if they haven't had a long history of getting hot. Put in
corebeds, strap to flat surface, and leave in car on sunny day. After a
day or two, they ought to be straight, assuming your car gets to at
least 140F and your epoxy is garden variety.
"jrmaclean" <[EMAIL PROTECTED]>
/Date:/ Mon May 8, 2006 9:27 pm
/Subject:/ [RCSE] Design question - how large to make stabs?
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Soaring Friends, My TD ship of choice is Compulsion by Fred Sage usually
with a 126 inch wing. I have had good success with this plane and managed
to stock up a few as bargains came available. Some time back there was a
comment that the stab was a bit small. Fred agreed and started to produce a
larger stab with a light layup to compensate. Unfortunately, mine warped.
Fred promised to fix but I was deliquent and events overcame Fred. I then
went to some lighter, built-up stabs which were somewhat larger in area. I
very much liked the way the plane flew with this setup. Unfortunately, the
stresses were too high during launch and I had some very exciting landings
with shredded stab halves! So what to do now? Any thoughts on the
following: sources for straight, tough, light replacement stabs. How big
in area and chord should they be? Characteristics of oversize / undersize
stabilizers on the aircraft handling?
Many thanks for helpful suggestions. Jim MacLean
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