Today's Message Index:
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1. 03:15 PM - Rotax Fuel Pressure Gauge (Hugh McKay III)
2. 06:32 PM - Elevator Trim Tab Setting (Hugh McKay III)
3. 07:22 PM - Stick position vs. Elevator position (Hugh McKay III)
Message 1
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| Subject: | Rotax Fuel Pressure Gauge |
Gentlemen:
The Fuel Pressure gauge from Rotax for my 912UL is marked with two red
lines, one at 0.2 bar, and the other at 0.5 bar. I assume these are min. and
max. indications. The Rotax 912UL Operators Manual page 10-5 states that the
min fuel pressure is 0.15 bar, and the max is 0.4 bar. Are these red lines
on the gauge essentially the figures given in the manual, 0.15 and 0.4 bar
(i.e. as close as they could mark the gauge)?
Hugh McKay
Message 2
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| Subject: | Elevator Trim Tab Setting |
Gentlemen:
I believe I understand how to set the trim tab on my Allegro 2000, but would
like to have some independent confirmation or correction. Here is my
understanding.
With the trim tab lever in the cockpit set in the vertical down position,
the trim tab should be set in the neutral position relative to the elevator.
In this neutral position the wire cable is clamped to hold the tab in this
position. When the lever is moved forward (nose down) the tab would be
pulled up (by the spring on top of the elevator) relative to the elevator
itself. When the lever is pulled back, the tab is pulled down (by the wire
cable) relative to the elevator itself. What I dont understand is the stop
screw on top of the tab that limits the max up position that the spring
pulls the tab to. How is this stop screw set? What is the limit of the
up-deflection of the tab, and how is it measured? Any help would be deeply
appreciated.
Hugh McKay
Message 3
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| Subject: | Stick position vs. Elevator position |
Gentlemen:
Gentlemen:
On page 180, section 44.9 of my Allegro 2000 Quick-Build Kit Assembly
Instructions there is a description of how to set the elevator stop bolts
located at the control stick. I have followed the instructions, which I
quote as follows; hold the elevator 3? above the neutral position and set
the front stop bolt. Hold the elevator 2 19/32 below the neutral position
and set the back stop bolt. I have set the elevator positions as explained.
However, with the stops set as described, the front stop bolt allows the
bottom of the hydraulic brake lever attachment on the stick to hit the
fiberglass console before the limit on the stop bolt. This should not occur.
With the stop bolts in these positions the stick can be moved forward until
the lower portion of the hydraulic brake lever hits the console, and pulled
back to a position slightly aft of vertical before hitting the rear stop. If
the elevator dimensions called for are correct, something else needs
adjusting.
Page 101 of the assembly manual shows a threaded fork at the end of the
elevator push/pull rod at the point just to the rear of the lower aileron
control lever and aileron stops. On my plane there is about of thread
showing on this fork, with an adjustable metal band clamp on the end of the
push/pull rod at this location. Can I loosen the metal band, and adjust this
threaded fork to reposition the stick to clear the console and keep the
dimension limits on the elevator? I am not sure what the adjustable metal
clamp on the elevator push/pull rod is used for other than this?
Can anyone help me with this problem?
Almost, almost, almost through with my Allegro,
Hugh McKay
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