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1. 12:55 AM - Re: Europa-List Digest: 2 Msgs - 04/07/25 (John Archer)
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| Subject: | Re: 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
> On 8 Apr 2025, at 08:34, Europa-List Digest Server <europa-list@matronics.com>
wrote:
>
> *
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> Europa-List Digest Archive
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> Total Messages Posted Mon 04/07/25: 2
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> 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: Europa-List: I know Squat about Mono Shock Block, Interesting
> From: "rparigoris" <rparigor@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: Europa-List: Re: I know Squat about Mono Shock Block, Interesting
> From: "rparigoris" <rparigor@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
>
>
>
>
>
>
>
>
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