Nico13 Posted January 24, 2017 Share Posted January 24, 2017 I was out in the School Tecnam on late Monday morning for a bit over an hour from Lethbridge and on returning while entering circuit I noticed the wind had picked up a bit but was still Nth West where it was when I'd left. Probably about ten kts with gusts so a bit of cross wind from the right on rwy 28. This is fine but you have to expect a bit of turbulence on final as you cross the tree line at the highway and also just before touch down from the hangers on the right. What made this interesting was just as I was about to come over the fence having already hit some of the expected rough air there was this sudden feel of a big drop in air speed. Now I'd checked only a second before as I crossed the road 60kts, a full flap approach and then this nothingness feel. Even before I could react with throttle as I glanced at the ASI it was wildly swinging up from below 60kts to 70kts and back to 60 again where it was originally, everything then continued on as normal with a right wing low touch down and a normal roll out. I had cockpit video and so I reviewed that few seconds, unfortunately with the turbulence tossing me around a little my head got in the way of the ASI and I didn't see how low it actually went but the wild swing back up was very evident. Not one I'd felt before but then I'm only a low hours pilot, have others experienced this sort of thing? Nico. Link to comment Share on other sites More sharing options...
Kununurra Posted January 24, 2017 Share Posted January 24, 2017 Hi Nico13 Can you post the video, I am sure that there is some experienced instructors/pilots on here that may be able to offer an explanation Link to comment Share on other sites More sharing options...
Nico13 Posted January 28, 2017 Author Share Posted January 28, 2017 Sorry its taken a bit to get back to this, been a bit busy. This is a short video of a recent approach where I had a large air speed variation in turbulence on final. An uneasy feeling when your airspeed suddenly drops but fortunately returns as quickly as it dropped off. I think it was just a result of the turbulence from the tree line as I could see no other real reason for it but have a look anyway there is slow motion at the end to see if there was anything unusual and also because my fat head was bobbing back and forth due to the rough air, but as noted I couldn't see anything. Thanks for looking. 1 Link to comment Share on other sites More sharing options...
Akromaster Posted January 28, 2017 Share Posted January 28, 2017 Looks like mechanical turbulence to me from the tree line. We get that over approaches on RWY18 at Penfield. Out of Riddells Creek same sort of thing on final approach RWY20. Just have to power through it and make sure there's enough speed so wings don't stall. 1 1 Link to comment Share on other sites More sharing options...
Jay_1984 Posted January 28, 2017 Share Posted January 28, 2017 Could have also been a bit of wind shear. Years ago, coming into Moorabbin in a 152, I was coming in to 35L which had a bit of crosswind from the left. As I was just about to cross the threshold, I could feel the wind just die away and the aircraft start to drop. Corrected quickly with a bit of power and nose down and all was good. Instructor commented after that the buildings on the left side of the airport acted as a wind break reducing the wind strength. Could be the same with that tree line along the highway. 1 1 Link to comment Share on other sites More sharing options...
cscotthendry Posted January 29, 2017 Share Posted January 29, 2017 The country there looks quite open. It could have been a willy-willy. I was sitting in the hangar at Watts Bridge the other day and it was fairly still wind-wise. All of a sudden, I heard this rushing type sound building up and then this strong wind coming over the hangar from the rear. It took about 20 seconds to pass over the hangar and then all was still again. I think that was a willy-willy too, but we don't get a lot of them at Watts Bridge (that I'm aware of). 1 Link to comment Share on other sites More sharing options...
David 95 Posted January 29, 2017 Share Posted January 29, 2017 Hi Yah willy-willy or a rotating thermal if you like. I have encounter them at YLED and YBLT if you drive into one edge or the other you will either get a massive IAS increase with much lift, not bad that one, but the opposite is you fly into a hole and drop or stall. On variable wind or turbulent days I keep the approach seed up a bit. Cheers David 1 Link to comment Share on other sites More sharing options...
Nico13 Posted January 29, 2017 Author Share Posted January 29, 2017 Thanks for the input guys, yes the Willy Willy was something that crossed my mind and also I have struck a day there where thermals were quite something and just trying to get down to circuit Highton was a battle, a little more wing area and I could have climbed out at idle :-) Link to comment Share on other sites More sharing options...
Bernie Knight Posted February 3, 2017 Share Posted February 3, 2017 Nicole Ken, Good to hear and see your getting plenty of flying in. Bernie 1 Link to comment Share on other sites More sharing options...
carrod01 Posted February 12, 2017 Share Posted February 12, 2017 Thanks for the video and promoting the discussion Nico. As a low hours pilot, I find these sort of discussions and video extremely valuable. I thought you did well! Cheers, Des 1 1 Link to comment Share on other sites More sharing options...
anjum_jabiru Posted March 9, 2017 Share Posted March 9, 2017 Sorry its taken a bit to get back to this, been a bit busy.This is a short video of a recent approach where I had a large air speed variation in turbulence on final. An uneasy feeling when your airspeed suddenly drops but fortunately returns as quickly as it dropped off. I think it was just a result of the turbulence from the tree line as I could see no other real reason for it but have a look anyway there is slow motion at the end to see if there was anything unusual and also because my fat head was bobbing back and forth due to the rough air, but as noted I couldn't see anything. Thanks for looking. It's a textbook landing. You did an excellent job, with the amount of cross wind and the last minute turbulence 1 Link to comment Share on other sites More sharing options...
shafs64 Posted May 28, 2017 Share Posted May 28, 2017 Hi nico what the white box on the right hand side of the panel on that aircraft. Link to comment Share on other sites More sharing options...
red750 Posted May 28, 2017 Share Posted May 28, 2017 Could have also been a bit of wind shear.Years ago, coming into Moorabbin in a 152, I was coming in to 35L which had a bit of crosswind from the left. As I was just about to cross the threshold, I could feel the wind just die away and the aircraft start to drop. Corrected quickly with a bit of power and nose down and all was good. Instructor commented after that the buildings on the left side of the airport acted as a wind break reducing the wind strength. Could be the same with that tree line along the highway. I know that this is an old post, haven't checked the thread for a while. re: YMMB, I had a similar situation on Rwy 35 (can't remember R or L, it was 40 years ago, but as I was doing a full stop after a bit of Xcountry, it was most likely 35L). I was in a Musketeer, and had my uncle, brother and brother-in-law on board. As we crossed the road on short final, the bottom dropped out of the world. I hit full power and held it low to build speed, and made a second approach and landing. Had 3 white faces with me when I landed. Link to comment Share on other sites More sharing options...
facthunter Posted May 28, 2017 Share Posted May 28, 2017 The tree line and the hangars sometimes cause mechanical turbulence on that approach at Lethbridge when the wind is from the right. Anytime there's a possibility of it happening use a powered approach and come in a little faster. If your speed drops off don't be afraid to use quite a bit of power to keep a safe airspeed. If you don't stabilise to your satisfaction go around. As your experience grows with these things you will make these adjustments and go round less . Low wing loading planes respond the most and are quite hard to manage as the wind strength grows, even when on the ground. Nev Link to comment Share on other sites More sharing options...
ian00798 Posted May 28, 2017 Share Posted May 28, 2017 Hi nico what the white box on the right hand side of the panel on that aircraft. Carbon monoxide detector 1 1 Link to comment Share on other sites More sharing options...
Nico13 Posted May 29, 2017 Author Share Posted May 29, 2017 Carbon monoxide detector Thanks Ian, yes that's exactly what it is. We had some exhaust smells in the cockpit which I'd mentioned to David and he fitted the detector. We found the exhaust problem a little later and had it repaired. 1 Link to comment Share on other sites More sharing options...
facthunter Posted May 29, 2017 Share Posted May 29, 2017 Good idea to have one. Nev Link to comment Share on other sites More sharing options...
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