JohnFrance
Joined: 17 Sep 2014
Posts: 82
Location: Grenoble France
|
 Posted: Mon Apr 07, 2025 11:55 pm Post subject: Europa-List Digest: 2 Msgs - 04/07/25 |
 |
|
Hi Ron,
Regarding the CG used for the weight and balance document, this is normally performed with the aircraft empty and the position of the wheels relative to a datum. This gives the base measurement from which loading the aircraft will change the centre of gravity. If I understand correctly what is important, in flight at least is the C of G relative to the wings centre of lift should remain within limits. What happens on the ground can affect ground handling as you say, high speed (tight) turns are to be avoided in a mono IMHO.
Fly safe
John
| Quote: | On 8 Apr 2025, at 08:34, Europa-List Digest Server <europa-list(at)matronics.com> wrote:
*
==================================================
Online Versions of Today's List Digest Archive
==================================================
Today's complete Europa-List Digest can also be found in either of the
two Web Links listed below. The .html file includes the Digest formatted
in HTML for viewing with a web browser and features Hyperlinked Indexes
and Message Navigation. The .txt file includes the plain ASCII version
of the Europa-List Digest and can be viewed with a generic text editor
such as Notepad or with a web browser.
HTML Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 25-04-07&Archive=Europa
Text Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 25-04-07&Archive=Europa
================================================
EMail Version of Today's List Digest Archive
================================================
----------------------------------------------------------
Europa-List Digest Archive
---
Total Messages Posted Mon 04/07/25: 2
----------------------------------------------------------
Today's Message Index:
----------------------
1. 01:54 PM - I know Squat about Mono Shock Block, Interesting (rparigoris)
2. 02:03 PM - Re: I know Squat about Mono Shock Block, Interesting (rparigoris)
________________________________ Message 1 _____________________________________
Time: 01:54:14 PM PST US
Subject: I know Squat about Mono Shock Block, Interesting
From: "rparigoris" <rparigor(at)hotmail.com>
Hi Group
We decided to shim our Shock Block. Added .505" of shims. Two 1/4" McMaster Marine
Plywood shims coated with Aeropoxy and one 1/16" Black PVC. The 1/4" Marine
Plywood was slightly undersized. Added two flat head #6 screws on diagonal locations
to hold shims in place. Drilled damper clearance holes with 1 3/8" hole
saw. This gives 3.1" clearance between actuation plates with only having to
use the 3.1" distance bolts to compress Shock Block about .005".
Here's an interesting fact, if Shock Block is compressed where you have the plane
sitting 2" lower compared to having a full height Shock Block, the Main wheel
contact area is moved aft by about 3 fingers! That's about 2 1/4" more aft.
That's just the sort of thing you want when heavily braking and swerving off the
runway pulling a lot of side G's to make that first turn!
No joking, turning while braking with a squatting Shock Block will make it easier
to decrease the diameter of your prop compared to a non squatting Shock Block.
For those who haven't figured why a Mono will more easily nose over while braking
in a turn, it's because if you brake going straight, the main wheel contact
point is far forward. In a turn, you will begin loading the outboard outrigger
which has a contact area much more aft of the main wheel contact area. Net is
the front pivot contact area is moved more aft making a turn compared to going
straight. The more sideways G's you pull, the more aft the contact area moves
because the more G's you pull sideways, the more load you will be putting on
the more aft Outrigger.
Anyway, the more you squat, the more aft the contact area moves. Heavy and a already
compressed Shock Block would be the worst case for moving Main wheel contact
area aft.
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515346#515346
________________________________ Message 2 _____________________________________
Time: 02:03:25 PM PST US
Subject: Re: I know Squat about Mono Shock Block, Interesting
From: "rparigoris" <rparigor(at)hotmail.com>
Hi Group
Just a side note on adding weight causing the main wheel contact area to move aft:
When performing CG calculations, Europa has you drop a plumb to get the precise
location of the main wheel contact area, same with tail wheel contact area aft
of the firewall.
As you load the plane, the contact area of the main gear will move more aft, I
will check and adjust contact area when changing weights.
Pushing down on the tailwheel moves the contact area more aft as well.
I will report back how much difference compensating for aft contact area movements
changes CG when loaded compared to leaving distance the same heavily loaded
the same as unloaded.
If anyone has figured this already, I'm interested in what you have to say!
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515347#515347
|
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
|
_________________
Europa mono Nr 192 |
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
