User Manual

34 E-flite Diamante 25e ARF Assembly Manual
After many pull ups, you really need more right thrust, as you
pass through 500’ you can clearly see your model drifting to the
left. Here is the cool tip: apply some right rudder and continue
to apply it until it tracks straight. Bring the plan into land and
check your rudder deflection. Use a protractor to see how many
degrees of rudder you required for a straight vertical. Whatever
it is, divide it by 2 and that will be what you need to add to
your right thrust. If you have 2 degrees of right rudder, you will
need to add 1 deg more of right thrust. It works, it really does,
and it works both ways. If you need left rudder (too much right
thrust) you can use the same equation.
Differential
Aileron differential is one of the most important aspects of
model trim. With the multiple point rolls on both up and down
lines in today’s modern patterns, poor differential can be a real
headache. The good news is it’s pretty easy to detect and adjust
for axial rolls. The important thing at this stage of the game is
knowing our thrust, and wing weight is correct, then we can
proceed with our differential setups. You’re probably starting
to understand the importance of trimming your model, in the
correct sequence. Each step complements the last and should
have no negative effects in trim.
Aileron differential is required when the drag of the down going
aileron does not mach the up going aileron. No, I am definitely
not George Hicks, and to be truthful it scares me that George
will read this and realize how simple I think. Before we go
further, I would like to interject here, that you make absolutely
sure you are not getting surface blow back. You will never get
your differential correct if you are. It’s easy to check for. Push
to a vertical down line and roll to the right, stop rolling for a
second, then roll again. The roll rate should be the same. If it
is slowing, then your surfaces are not reaching their intended
throws. Another sign is your up line roll rate is faster than your
down. Please, you need to fix this. Do what needs to be done.
Either increase your servo power, or improve your geometry, by
reducing the servo horn radius, and/or increasing the distance
the control horn pickup is from the hinge line, or if you have lots
of cash, add more servos. Whatever path you take, you can’t
afford to have surface blow back as your flying will never be
consistent. Most modern radios have a differential program. I
have used both the ATV function or the Differential function and
both work well.