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rparigoris
Joined: 24 Nov 2009
Posts: 804
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 Posted: Mon Apr 07, 2025 12:53 pm Post subject: I know Squat about Mono Shock Block, Interesting |
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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.
Ooops, forgot to add that when pulling forward braking Gs, it will make the Shock Block compress more adding to an even more aft Main contact area as described above.
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Last edited by rparigoris on Mon Apr 07, 2025 1:15 pm; edited 1 time in total |
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rparigoris
Joined: 24 Nov 2009
Posts: 804
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| Posted: Mon Apr 07, 2025 1:03 pm Post subject: Re: I know Squat about Mono Shock Block, Interesting |
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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.
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