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We agree that any airplane is in trim for a given set of conditions
existing at that time. As my primary instructor said: " the rudder is
a trimming device." (Perhaps a little too simplistic, but a good
starting point.)<br>
We are constantly looking for the perfect combination that requires the
least work from the pilot, to achieve the most precision of results.
Probably a matter of taste, largely.<br>
As I recall, this thread started because of one flyer noticing the
asymmetrical airfoil on his new fuselage. While certainly not original
in aviation, I must admit that I've not seen this before in the
modeling world. Or, probably, it's just that I've not noticed it
before. I sure hope he keeps us updated as to how it works in the real
world of modeling.<br>
<br>
Bill Glaze<br>
<br>
Bob Richards wrote:
<blockquote
cite="mid20050131025836.76120.qmail@web30207.mail.mud.yahoo.com"
type="cite">
<div>Bill,</div>
<div> </div>
<div>I don't think it is uncommon for full-scale planes to have
offset or asymmetrical fins. However, they are designed with the right
amount *for cruise*. Any other speed/power setting will change things.
Since they are after the most efficiency in cruise conditions (better
range), they will probably want the least amount of offset thrust as
possible, and will trim the rudder/fin accordingly. If they expect the
fin to be providing a constant yaw force, it would make sense to give
it an asymmetrical airfoil for the most efficiency. Let the pilots deal
with the other situations.</div>
<div> </div>
<div>I personally think the right-thrust is the correct way to go. I
can't argue with what others have said about throttle mix working for
them, but I don't see how it would work. I think you will have less
slipstream effect happening at full throttle in level flight than you
would at full throttle in a climb. As the prop unloads with increasing
airspeed, the slipstream effect should decrease.</div>
<div> </div>
<div>Of course, I remember the very detailed trim instructions that
came with my Great Planes Cap21. Something like: "Pull the nose up
until pefectly vertical. If the plane yaws off to the left, add weight
to the right wingtip". There was no mention ANYWHERE about engine
thrust. Tossed that in the trash. :-)</div>
<div> </div>
<div>Bob R.<br>
<br>
<b><i>Bill Glaze <a class="moz-txt-link-rfc2396E" href="mailto:billglaze@triad.rr.com"><billglaze@triad.rr.com></a></i></b> wrote:</div>
<blockquote class="replbq"
style="border-left: 2px solid rgb(16, 16, 255); padding-left: 5px; margin-left: 5px;">Adam:<br>
This may be a little bit off the mark, but just a little bit. During <br>
WW2, the Italian firm Fiat produced a very good series of fighters with
<br>
exactly the characteristics you mention, that is, an asymmetrical <br>
fin/rudder airfoil. Seemed to work well for them; other nations handled
<br>
the problem differently.<br>
Bill Glaze<br>
<br>
</blockquote>
<br>
<br>
Bob Richards<br>
<a class="moz-txt-link-abbreviated" href="mailto:bob@toprudder.com">bob@toprudder.com</a><br>
<a class="moz-txt-link-freetext" href="http://www.toprudder.com">http://www.toprudder.com</a>
</blockquote>
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