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- by brian porman
If DOWN THRUST is correct then the plane
will be in trim from idle to full speed. STEPS:
1. Fly to altitude and establish trim
at half throttle.
2. Push forward to full throttle.
3. If the nose goes up then more DOWN
THRUST is required.
4. If the nose goes down then add more
upthrust, [or lessen the DOWN THRUST]
5. Check the new setting by flying to
altitude;
6. From half throttle, chop the throttle
to near idle.
7. Plane slows and starts to descend.
8. Plane may now be retrimmed.
9. Landing is then a matter of working
the throttle forward and back to stay on the glide path. [but I still react
wrongly and use the #^*~* elevator!!]
Centre of gravity position - Stick with
the recommendations of the kit but if the model is without information
try between 1/4 and 1/3 of the mean chord as a starting point.
1. Lateral balance is often forgotten
but a heavy wing that is not corrected with a balance weight
can cause aileron trims that worsen the
out of balance situation when an inverted attitude is
involved. Check this first.
2. Fly to altitude
3. Dive with elevator stick forward and
then let go the stick.
[a] If plane pulls up by itself then
Cof G is too far forward. Move the balance point back - if
battery and receiver are already as far
back as possible then for a temporary fix, tape lead to the fuselage at
the tail.
[b] If plane continues in the dive then
balance is “neutral”. It’s at this point that point [2] becomes significant!!!
[c] If the plane dives more so then the
Cof G is too far aft - move forward. Point [2] is even more important
in this one!!!! If you’ve managed to get this far with a significant
rearward C of G then you should be writing this article! |
