SR Batteries 1/4 Scale Fokker Eindecker E1
The maiden flight was flown on 11/26/2005 along with two more flights.
It was a windy day, but not gusty and nothing to be concerned about. But
the wind made it difficult to determine what trim was needed.
At this time the
model is balanced where indicated by the instructions but the tail tends to drop
in turns which tells us it may be a shade tail-heavy. The aircraft
responded to pitch nicely and wasn't the least bit twitchy. If you watch
the video you can see Mike had full elevator control all the way to touch-down
(which was extremely slow!).
Mike said the model was yawing left. Again,
the wind made it difficult to tell if the model is out of trim or if it was
weather-vaning. Adding right rudder trim seemed to make the problem worse
to a point. More rudder trim seemed to correct the yawing. The
rudder is turned about 1 or 2 degrees to the right.
A couple clicks of right
aileron were also added. It was so little that it isn't immediately
obvious when viewing the model.
Both the yaw and roll trim may be due to one
or both wing panels being slightly twisted by the flying wires.
Mike wants to
swap the Zenoah G26 for either a DA 50 or a Zenoah G45. I think the power
is just right because it is plenty to fly the model. The rationale
normally given for having more power than necessary is to be able to get out of
This model should never get into the kind of trouble that it needs
that much power to get out of. Mike isn't going to be flying a wild
aerobatic routine down low. The only real hazard, if you can call it that,
is the light wing loading makes it susceptible to the wind rolling the model.
On the day of the test flight it was clear that wind is a minor problem at
The bottom line is that using the recommended engine will force the
pilot to fly this model as it should be flown. There is no danger of being
underpowered. It's one of the few models that I've seen that actually has
the correct power.
We will be experimenting with different propellers to find
the one that works best. The one thing I don't like about this engine is
that the largest propeller that can be used looks ridiculously small. But
that's why scale modelers have a scale display prop and a flight prop.
maiden flight was performed using a 19 x 8 propeller which is a little too big
for the engine. The second flight was flown using a 16 x 10. The 16"
propeller allowed the engine almost 1,000 more RPM, but Mike said the model flew
worse with it.
Mike has ordered 17" and 18" propellers. One of those
should be the best for this engine/airframe combination. The results will
be posted here.