Yep I’m thinking about that. Also the cable steering bracket on top of the tailwheel shaft maybe loose.
Sent from my iPad The tailwheel shimmy might also be a loosening in the bearing set that holds the tailwheel fork - quite a lot of pieces to the assembly ! If your brakes still work it might be the reservoir or associated tubing leaking (?) The tubes stiffen over time, and the reservoir becomes brittle.
Hi Gyozo.
Depending on where its leaking from it may be easily repairable.
Mine (dimona mk1) was leaking from the park brake valve portion of the master cylinder. if memory serves me correctly I replaced the o-rings on that valve and it was good to go.
cheers
ric
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
On Tue, Jul 1, 2025 at 8:15 AM, Ian Mc Phee
Over inflation can start it - we have rubber shock version.
Ian McPhee
+61 428847642
Hi all,
I have just had an interesting flight in a Dimona at Swansea in the UK. … operating on a sealed strip
Had real bad tailwheel shimmying on landing
The tailwheel asst is one of those rubber sprung types
Any ideas the best approach to fix the prob
Ian W
In uk but normally New Zealand
Sent from my iPad
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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