Europa Aircraft Rotax 914, Руководство по установке

Страница: 38 / 47

Balance
To avoid damage to engine parts, instruments, etc., it may be necessary to balance the
propeller/spinner assembly. Dynamic balancing is recommended.
The vernier scale
The vernier scale on the inclinometer supplied with the Warp Drive propeller is designed to allow the
accurate measurement of small angles that would otherwise be too small to see using a standard
scale. The principle of its operation is the alignment of lines on inner and outer scales. The outer
scale on your inclinometer is in degrees of arc and the inner scale
represents minutes of arc.
As an exercise, using the inclinometer, align the two zeros of inner and outer scales together. If you
now look at the alignment of the graduations of both inner and outer scales you will see that they
progressively misalign as you move away from the zero and then, after the 30 of the inner scale, they
start to realign until the graduation marked 60 is back in line with a graduation on the outer scale. See
the first illustration in the figure below.
If you now look at the graduation mark representing 15 on the inner scale and rotate this scale to align
with the nearest adjacent graduation on the outer scale you will have moved the inner scale 15
minutes of arc or 1/4
o
. See the second illustration in the figure below.
Looking at how the two zeros have misaligned will confirm that the inner scale has moved
something like 1/4
o
but, without the vernier it would be difficult to be absolutely sure.
Page 8 - 4
September 2001
Issue 4 Europa XS Rotax 914 Engine Manual
Fig 1. Vernier scales