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  #16  
Old 10-26-2012, 12:51 AM
PTKay PTKay is offline
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The problem of the Xenon braking mast has been addressed by Aviation Artur Trendak
in their ZEN1 already half a year ago. Any earlier attempts to radically solve the probem
were blocked by Raphael Celier, sticking firmly to his faulty design.

I reported about it already in February:

http://www.rotaryforum.com/forum/sho...412#post463412

Quote:
A group of highly skilled and experience aeronautical engineers
had a look at the original solution and came up with a fix.

It is based on using a car suspension "silent block"
to accommodate and isolate the mast vibrations
from the rigid monocoque cabin structure.

This also should eliminate flexing cyclic moments an the mast
and possible fatigue cracks observed by the earlier design.

This is a radical solution to the known problem, solved before
by simple strengthening plates on the standard mast.


You can see in the top right corner of the image the strengthened mast and
the elastic fixing in the middle of the mast.

The machine presented in the image has been delivered to a customer in Turkey
and is flying without any incident.
TC-UZZ - Zen1 model delivered 2012 - metallic pink. (Thanks for the pic, Steve_UK.)

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  #17  
Old 10-26-2012, 01:06 AM
PTKay PTKay is offline
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The tests of the ZEN1 mast were undertaken by the Institute of Aviation
team working on their new project, the I-28 tractor gyroplane.

http://www.rotaryforum.com/forum/showthread.php?t=34125

The mast they use is supplied by Aviation Artur Trendak.

Quote:
The big obstacle was also the demand to test the mast
and mast fixing fr 3,5G load, but not only vertically,
but also in pitch and roll loads.

It didn't help to explain to ULC, that gyrocopter rotor will never
a load greater than 2G before stalling the blades, they
used the FW norm which requires 3.5G proof.
Their argument for the sideways test was, that it is necessary
to simulate sudden pitch and roll control inputs as well.

The additional benefactor of these tests is the ZEN1 new g3 version,
using the same mast construction and fixing.
It remains to be discussed, if such loads will ever occur, but what ULC
demands will certainly result in much stronger and better mast.

The new ZEN1 G3 with the new mast is undergoing the certification
by ULC (Polish FAA) and should be available soon.

Enclosed: flight testing of the new mast.
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Last edited by PTKay; 10-26-2012 at 01:30 AM.
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  #18  
Old 10-26-2012, 01:12 AM
PTKay PTKay is offline
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In this image the broken mast can be seen lying directly over the pilots head,
if the blades were still turning, they would smash through the windscreen.

The rotor remains attached on the rest of the mast and the control rod,
it didn't "fly away", so following Jon, Alex and others question:

what's the point for this feature, other then risking the failure in flight?
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  #19  
Old 10-26-2012, 10:30 AM
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WaspAir WaspAir is offline
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Quote:
Originally Posted by BEN S View Post
But I don't have a monoquoque shell protecting me.
The monocoque nature of the shell doesn't inherently make it any safer, stronger, or more energy absorbing than other construction styles. I wondered a bit why it was hyped so much in the opening message of this thread. It's not a new feature in gyros (the 18A cockpit is monocoque, built in 1965), and by itself it doesn't offer any higher level of safety. Tube frames can provide equal or better protection.
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