From: Brian Davies [mailto:brian.davies@clara.co.uk]
Sent: 09 February 2011 09:46
Subject: RE: Europa-List: Monowheel disk brake
Remi,
I did not have any problem when I had a mono but I have had problems on a
racing car recently that meant I had to learn fast about disk brake
technology. I think your problem could be lack of bedding in of new brakes.
In order to work correctly the brakes need to be applied at about 50% normal
for a number of times and then allowed to cool down fully. During this
process, pad material should be deposited on to the disc to create a shiny
surface that will give smooth braking action and long life. If this process
does not take place you will get tearing of the disc material/ rough
surface, leading to poor braking action and short pad life.
The Trigear Owners Manual describes a brake bedding procedure that requires
two consecutive full stop braking applications from 30 to 35knots without
allowing the brakes to cool between each application. You then need to check
that the conditioning process has been successful by looking for the shiny
surface and also checking that the brakes will hold during a static full
power run.
I hope this helps.
Regards
Brian Davies
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Guerner Remi
Sent: 08 February 2011 21:23
Subject: Europa-List: Monowheel disk brake
Hi all,
My original brake pads lasted 635 flight hours. The second set (Cleveland
66-106) lasted only 159 hours. I also had to refill the master cylinder
every 20 hours or so to compensate for the rapid pad wear. I then discovered
that the surface of the disc was showing circular grooves with some embedded
steel particles emerging from the surface. I decided to order a new disk
---From Europa (142 british pounds + VAT) . I flew with the new disk and new
pads (Rapco RA66-106) for the first time yesterday. The attached picture
shows the surface of the new disk after only two full stop landings with
moderate braking. The aspect of the surface is very similar to the old disk
one. I do not expect the new pads to last long with such a rough surface!
Has anyone experienced this problem? Any solution?
Regards
Remi Guerner
F-PGKL
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