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JonathanMilbank
Joined: 14 Apr 2012
Posts: 394
Location: Aberdeen area
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 Posted: Mon Jun 18, 2018 12:26 pm Post subject: Turbulence and resonance |
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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.
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Ivor
Joined: 23 Jul 2015
Posts: 51
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| Posted: Tue Jun 19, 2018 7:57 am Post subject: Re: Turbulence and resonance |
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I know yesterday was forecast for severe mountain waves in scotland
and personally i wouldn’t have flown 
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,
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davidjoyce(at)doctors.org
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| Posted: Tue Jun 19, 2018 8:25 am Post subject: Turbulence and resonance |
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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 wouldn’t have flown
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
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wdaniell.longport(at)gmai
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| Posted: Tue Jun 19, 2018 8:28 am Post subject: Turbulence and resonance |
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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 GÂ 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
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
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JonathanMilbank
Joined: 14 Apr 2012
Posts: 394
Location: Aberdeen area
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