Today's Message Index:
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1. 08:23 PM - What did you do with your europa this week - 24/01/25 (Area-51)
2. 10:04 PM - The Obsidian Files - Mono Classic Undercarriage (Area-51)
Message 1
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| Subject: | What did you do with your europa this week - 24/01/25 |
This week 181 had a UMA manifold pressure gauge fitted and repositioned Hobbs meter
into undercarriage lever void... It was an adventure...
First a new piece of panel plate was drafted, and this time rather than waiting
for pieces to be lazer cut stuff got 3D printed instead. Two pieces were printed,
the panel plate and gps pilot mounting.
Everything worked great; except the $75 ebay "NOS" uma gauge... it did not work
correctly... so the gauge was removed and dismantled for inspection. Inside was
found corrosion on the primary lever arm. So the arm got polished and unit
bench tested. Testing showed the bellows was leaking; a very ineffective climb/descend
gauge; opening the gauge and seeing the inside quality it is a $30 piece
of average; not a single ruby bearing anywhere to be seen; somebody is making
a gigantic profit margin... So in the end an auto garage vacuum pressure gauge
was fitted to extract data information with prior to swapping out the 80hp
to 100hp.
Now need to replace UMA gauge with a functioning unit; very dissapointing when
people on ebay sell something as "new" and it ends up arriving ready for the garbage
bin.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515241#515241
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Message 2
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| Subject: | The Obsidian Files - Mono Classic Undercarriage |
In this chapter of the obsidian files we investigate the undercarriage of the Mono
Classic and what the numbers returned.
The study came about through a primary request to review the possibility of fitting
a 75" propeller that had been offered for trial, and an 8.50x6 tyre... The
short answer to both these opportunities was, "not without raising the nose
of the aircraft while on the ground and redesigning the undercarriage swing arm".
So the swing arm got completely redesigned and results stress tested.
Results showed that at AUW of 650kg the OEM swing arm, at 4.2kg mass, was able
to yield separately at 0.5g lateral and 2.5g vertical, and able to yield at 0.5g
lateral and 1.5g vertical combined.
In contrast a redesigned 4041-T Chromoly tubular arm in 2.00mm wall thickness,
at 4.7kg mass, was able to yield separately at 1.5g lateral and 2.5g vertical,
and at 0.5g lateral and 2.5g vertical combined... The same design utilising a
3.00mm wall, with a mass of 7.0kg, was able to yield 2.5g lateral and 4g vertical.
The design was rolled back to 2.00mm wall thickness.
Results indicated similar numbers across the OEM and substitute design. A lighter
1.65mm wall thickness was trialed and although weighing 3.2kg failed stress
testing at AUW of 650kg plus 2.5g vertical loading. Overall the tubular chromoly
design displayed more robust results than the OEM unit.
Fitting of an 8.50x6 tyre requires lateral clearance for 200mm width and 560mm
OD of the tyre. Utilising the same swing geometry as the OEM arm and trimming
of the aircraft belly skin forward of the centre tunnel bulkhead panel is required
for retraction. Attention to the throttle sector arm cover may be required
also. The redesigned tubular swing arm provides retraction stops to mitigate
a wheel up landing scenario.
Utilising an 8.50x6 tyre on the classic mono allows for fitting of a 75" propeller.
With the tail wheel down a propeller tip to ground clearance of 8.0" is achieved.
With the aircraft in a Take Off Attitude with tail wheel raised off the
ground propeller tip to ground clearance is 6.0". These dimensions have been
calculated with allowance for tyre squish.
Although the above clearances look appealing they will be reduced considerably
when a momentary rut combined with an over forward pitch is seen. Running the
above 75" prop option would be for the experienced high time mono pilot only.
That's all for this episode of the Obsidian Files today...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515242#515242
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