We found that tightening the steering cables rectified bad shimmy on the 
straight shaft tail wheel.Although the suspension tailwheel with the rubber 
blocks still shimmied badly after that I suspect it might be related to 
softening (or hardening?) of the blocks over time that may be involved.With the 
super Cub we found keeping it highly inflated helped a lot on sealed surfaces 
which would have been due to less tread surface making contact with the bitumen 
I think.The other possibility is a slightly bent vertical shaft due heavy 
landings and thus throwing the geo.etry out. There is a hell of a lot of load 
on the tailwheel on landing particularly on rough ground.Laurie 

Yahoo Mail: Search, Organize, Conquer 
 
  On Tue, Jul 1, 2025 at 8:15 AM, Ian Mc Phee<[email protected]> wrote:   
Over inflation can start it - we have rubber shock version.
Ian McPhee +61 428847642 
On Mon, 30 June 2025, 20:03 Ian Williams, <[email protected]> wrote:

Hi all,I have just had an interesting flight in a Dimona at Swansea in the UK.  
… operating on a sealed stripHad real bad tailwheel shimmying on landingThe 
tailwheel asst is one of those rubber sprung typesAny ideas the best approach 
to fix the prob
Ian WIn uk but normally New Zealand
Sent from my iPad

On 21 Jul 2022, at 13:02, pattoninfl.aol.com via dog 
<[email protected]> wrote:



Gyozo,
It's a master cylinder used in Piper Cherokees. I replaced mine about 1 year 
ago.  I bought mine from a aircraft junkyard here in the US.
Regards,Bruce Patton


-----Original Message-----
From: Győző Horváth <[email protected]>
To: [email protected]
Sent: Thu, Jul 21, 2022 2:55 am
Subject: [DOG mailing list] Master brake cylinder

Hi,

It seems that there is a leakage at master brake cylinder of my Dimona. The 
belly is full with brake fluid, however the brake still works well. Do you have 
experience with it? Is it a Cessna cylinder? What kind of parts should be 
ordered for repair and do you know the specifications and source?

With many thanks and best regards
Gyozo
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