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mark.bitterlich(at)navy.m
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 Posted: Thu Jul 31, 2014 6:29 am Post subject: Aerobatics Impacts on Props |
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SteveO, I changed your subject line so the original thread would remain the same.
The impacts I have seen from the aerobatics that you have described (such as Lomcevaks) impact themselves mostly with the engine. The most immediate and obvious being with leaking shaft seals on the reduction drive assembly (which require a special tool to replace) and also worn "Rubbers" on the engine mounts. The seal leaking is pretty obvious as oil will be pretty much all over everywhere. The engine rubbers not so much.. you have look carefully.
Vibration issues can be caused by so many many things, I think it would take a book to cover them all. 
Not the exact answer to your question, but on the same topic... sorta.
Mark
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Steve Geard
Joined: 09 Dec 2013
Posts: 36
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| Posted: Tue Aug 05, 2014 3:04 pm Post subject: Re: Aerobatics Impacts on Props |
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Thanks Mark. Yeah the front shaft seal is leaking a bit. A lot if I do a prolonged flat spin.
A couple of people have mentioned worn engine mount rubber as a possible cause for harmonic vibration. I shall look to replace them in the next service.
What do worn rubbers look like? The motor is very rigid and had no discernible play in the engine frame.
Thank you for your post.
Anyone got a set of engine mount rubbers available?
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scdawson(at)gmail.com
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| Posted: Tue Aug 05, 2014 6:02 pm Post subject: Aerobatics Impacts on Props |
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"What do worn rubbers look like?"
<snicker>
Please nobody send him pictures. Please.
Shaun
On Tue, Aug 5, 2014 at 4:04 PM, Steve Geard <stevegeard(at)xtra.co.nz (stevegeard(at)xtra.co.nz)> wrote:
[quote] --> Yak-List message posted by: "Steve Geard" <stevegeard(at)xtra.co.nz (stevegeard(at)xtra.co.nz)>
Thanks Mark. Yeah the front shaft seal is leaking a bit. A lot if I do a prolonged flat spin.
A couple of people have mentioned worn engine mount rubber as a possible cause for harmonic vibration. I shall look to replace them in the next service.
What do worn rubbers look like? The motor is very rigid and had no discernible play in the engine frame.
Thank you for your post.
Anyone got a set of engine mount rubbers available?
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SteveO
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Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
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| Posted: Tue Aug 05, 2014 6:31 pm Post subject: Aerobatics Impacts on Props |
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You know this topic could go two ways from here! So what's it going to be? Pictures of Wrinkled used latex or crinkled cracked compressed black rubber. ;^)
VD
Sent from my iPad
On Aug 5, 2014, at 9:01 PM, Shaun Dawson <scdawson(at)gmail.com (scdawson(at)gmail.com)> wrote:
[quote]"What do worn rubbers look like?"
<snicker>
Please nobody send him pictures. Please.
Shaun
On Tue, Aug 5, 2014 at 4:04 PM, Steve Geard <stevegeard(at)xtra.co.nz (stevegeard(at)xtra.co.nz)> wrote:
[b]
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Steve Geard
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Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
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| Posted: Thu Aug 07, 2014 8:47 pm Post subject: Aerobatics Impacts on Props |
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;^) good choice,
Doc
Sent from my iPad
| Quote: | On Aug 6, 2014, at 4:00 AM, Steve Geard <stevegeard(at)xtra.co.nz> wrote:
Excellent. Humor is a very important part of life.
I shall forthwith inspect all my rubbers for wear after each use.
I hereby understand that if they be black, cracked and wrinkled, then they for sure have seen good service.......
Steve [Laughing]
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SteveO
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