Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Turbulence and resonance

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Europa-List
View previous topic :: View next topic  
Author Message
JonathanMilbank



Joined: 14 Apr 2012
Posts: 383
Location: Aberdeen area

PostPosted: Mon Jun 18, 2018 12:26 pm    Post subject: Turbulence and resonance Reply with quote

Today I went flying in stronger winds and more turbulence than is my custom. After 51 years of flying, with tens of thousands of hours both military and commercial, I prefer the quiet life. Circumstances dictated that I should make today's flight and although the turbulence was considerably less than the worst I've experienced, the bumps were quite short and sharp.

With each such abrupt bump, I felt something through the airframe which I've never noticed before in my Europa viz. a resonant short duration vibration which I could only attribute to a shuddering in the wings. It wasn't alarming and I didn't feel the need to reduce speed. There definitely wasn't any "cobblestone" turbulence such as I have previously encountered a few times.

The flight was done at 1500' to 2000' AGL and I'm just wondering whether any of you have experienced something similar. Perhaps it's peculiar to the Scottish hilly environment, but I doubt that! My engine is securely mounted, because I had the cowls off yesterday and checked the engine frame closely.

Just curious!

P.S. It has also occurred to me that perhaps the engine could be resonating on the Lord rubber mounts.


- The Matronics Europa-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List
Back to top
View user's profile Send private message
Ivor



Joined: 23 Jul 2015
Posts: 51

PostPosted: Tue Jun 19, 2018 7:57 am    Post subject: Re: Turbulence and resonance Reply with quote

I know yesterday was forecast for severe mountain waves in scotland
and personally i wouldn’t have flown Very Happy
but i have flown in moderate to severe turbulence, I usually slow down and tighten the seat belts and put the Propellor into manual,
then it’s the case of riding it out, but other than a slight shudder when you
get a updraft with negative G i find the Europa excellent in rough air in
comparison to spam cans,


- The Matronics Europa-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List
Back to top
View user's profile Send private message
davidjoyce(at)doctors.org
Guest





PostPosted: Tue Jun 19, 2018 8:25 am    Post subject: Turbulence and resonance Reply with quote

In my early days in my mono I hit some severe turbulence related to Welsh mountains. Fortunately my straps were tight or else my head or the canopy might have been the worse for wear. However when I came to put the gear down the lever stopped about 1/2" from the detent. Clearly the inertial forces on the undercarriage had forced a shift in the three bolt join with the gear lever. In the end I managed to get it into the detent by pulling like h++l with my right hand and thumping that hand with my left whilst flying with my knees. Otherwise I was going to land simply holding the lever back once throttle closed, hoping that the gear was overcentre and not about to snatch the lever out of my hand. Morals:
1.Beware rota in mountain lea in high wind conditions.
2. Drill out bolt holes to give a tight fit and bond that joint when initially fixing it.
Regards, David Joyce, G-XSDJ


On 2018-06-19 16:57, Ivor wrote:
Quote:
Quote:
--> Europa-List message posted by: "Ivor" <g-iver(at)live.co.uk (g-iver(at)live.co.uk)>

I know yesterday was forecast for severe mountain waves in scotland
and personally i wouldnâ&euro;&trade;t have flown Very Happy
but i have flown in moderate to severe turbulence, I usually slow down and tighten the seat belts and put the Propellor into manual,
then itâ&euro;&trade;s the case of riding it out, but other than a slight shudder when you
get a updraft with negative G i find the Europa excellent in rough air in
comparison to spam cans,


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=480984#480984
ttp://www.matronics.com/Navigator?Europa-List
ics.com
.com
.matronics.com/contribution



- The Matronics Europa-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List
Back to top
wdaniell.longport(at)gmai
Guest





PostPosted: Tue Jun 19, 2018 8:28 am    Post subject: Turbulence and resonance Reply with quote

Colombia is mountainous and the trades blow 15/30 kt 350 days a year.  As a consequence it's always bumpy.  HJ460 handles this without any drama.
Incidentally it feels quite dramatic but my dynon G  meter has never registered over 2 G.
On sunday I landed with 18kt right X wind (for some reason I prefer L X wind) which made me quite tense but down in one piece and in reasonable style.
William Daniell

LONGPORT
+57 310 295 0744


On Tue, Jun 19, 2018 at 10:57 AM, Ivor <g-iver(at)live.co.uk (g-iver(at)live.co.uk)> wrote:
Quote:
--> Europa-List message posted by: "Ivor" <g-iver(at)live.co.uk (g-iver(at)live.co.uk)>

I know yesterday was forecast for severe mountain waves in scotland
and personally i wouldn’t have flown Very Happy
but i have flown in moderate to severe turbulence,   I usually slow down and tighten the seat belts and put the Propellor into manual,
then it’s the case of riding it out,  but other than a slight shudder when you
get a updraft with negative G i find the Europa excellent in rough air in
comparison to spam cans,




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=480984#480984






====================================
pa-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Europa-List
====================================
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
====================================
WIKI -
errer" target="_blank">http://wiki.matronics.com
====================================
b Site -
          -Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
====================================





- The Matronics Europa-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List
Back to top
JonathanMilbank



Joined: 14 Apr 2012
Posts: 383
Location: Aberdeen area

PostPosted: Wed Jun 20, 2018 12:45 am    Post subject: Re: Turbulence and resonance Reply with quote

The video in this advert for Lord mounts is quite interesting, with a camera inside the cowling recording the mounts performing under aerobatic loads. Perhaps it is possible for an engine to "shudder" a little on its mounts, particularly in turbulence?

You could cut to the chase and start watching from 1:30.

https://www.lord.com/products-and-solutions/passive-vibration-and-motion-control/aerospace-and-defense/fixed-wing/general-aviation-mounts


- The Matronics Europa-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Europa-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group