Carl/John
The way I read that is that the sentence requiring you to deflate the
tyre
only applies to "for each aeroplane with conventional landing gear
struts
using fluid or mechanical means for absorbing landing shocks". Unless
there
are more words elsewhere in the regulation that are not in this email
Pete
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of
JohnDHeykoop@aol.com
Sent: 29 September 2007 18:30
Subject: Re: Europa-List: Re: Woodcomp scimitar blades (was Emailing:
IMG_0410, IMG_04...
Carl
Andy Draper said the following in a letter he wrote me on 15th August.
" The Woodcomp scimitar blades are acceptable, however there is an issue
with the diameter. The maximum diameter propeller accepted on the Europa
XS
monowheel is 64" (1625mm). If you wished to fit a larger diameter
propeller,
you will need to show compliance with CS-VLA925. Amongst other things to
check, the ground clearance from the propeller tip with the aircraft
fully
loaded, in a level attitude and with a flat tyre must be at least
230mm."
Andy therefore seems to think you do have to have a minimum of 230mm
clearance with a deflated tyre. However, I agree with your
interpretation of
the rules, and I think he could be persuaded that with a deflated tyre
the
rules only require "positive clearance".
Regards
John
In a message dated 28/09/2007 16:26:01 GMT Standard Time,
carl.pattinson@btinternet.com writes:
John,
Having tracked down the VLA specs I had a look at what it had to say
about
prop clearances. Unless I am very much mistaken I dont beleive the tyre
should be deflated to achieve the 230mm clearance.
Here is the actual wording
"(a) Ground clearance. There must be a clearance of at least 180 mm (for
each aeroplane with nose wheel landing gear) or 230 mm (for each
aeroplane
with tail wheel landing gear) between each propeller and the ground with
the
landing gear statically deflected and in the level, normal take-off, or
taxying attitude, whichever is most critical. In addition, for each
aeroplane with conventional landing gear struts using fluid or
mechanical
means for absorbing landing shocks, there must be positive clearance
between
the propeller and the ground in the level take-off attitude with the
critical tyre completely deflated and the corresponding landing gear
strut
bottomed."
If my interpretation is right there have to be two checks made. You
first
load the aircraft up to its maximum weight and the clearance has to be
in
excess of 230mm, then you deflate the tyre and there should then be what
they describe as "positive clearance" .
Having said this my understanding is that most Classic Europas would
fail
the VLA test even with the 1575 blade fitted (ie: the Warp Drive).
However
the ruling is not retrospective so should not affect existing approved
installatons.
Apparently the XS monos are not similarly affected because the XS engine
mount raises the propeller by about 1.5" (compared to the mono.
Consequently
the 1625mm prop can be approved.
None of which is any help to me - it seems the Woodcomp is a non
starter.
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