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juddering on take off

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jennywren14	juddering on take off	Lead	[-]
Posts: 1 (09/03/09 21:25:28) Reply Quote More My Recent Posts	Tags : None Hi everyone - first post on the forum but I've got a lot of support from reading other people's comments - so thank you. I have a question about why on some flights there is tremendous juddering on the take off - I get very frightened when it happens as it just seems that the plane is struggling somehow. Related to this question is the issue of whether I would benefit from the SOAR materials. The reason I haven't used them so far is that each time I get close to purchasing I worry that by doing so I am going to make my problem worse before it gets better. By that I mean that I will have to recognise my fear, face it head on and possibly be more aware of it before dealing with it. I'm a 'watch every episode of air crash investigation and memorise details of plane crashes in an effort to develop a 'fool-proof plan'' type of person. Not healthy I know but somehow I have managed to fly multiple times a year for many years. It's just that I rarely enjoy the flights and always revert back to obsessively seeking information on planes and crashes in the days before I fly. My concern is that I would replace that form of obsessive behaviour with obsessive SOAR behaviour and actually feel no more comfortable than before. I'd really appreciate feedback from others who might recognise themselves in what I'm saying. Hmm, it seems my post is far more about the second issue than the first - apologies for the confusion - I'd love feedback on either issue. Many thanks, JW
Capt Tom Bunn MSW LCSW		#1	[-]
Posts: 2694 (09/04/09 08:31:50) Reply Quote More My Recent Posts	TV shows about plane crashes are going to cause you trouble. It costs a lot of money to put together a show. The producer wants the show to run for years, so they omit information on the cure of the problem so it makes it appear to the viewer that the problem is still a problem and it could happen to you on your next flight. That helps increase viewership, and makes the show more financially viable, but it is irresponsible "journalism" because it is NOT journalism, but nothing more than a scare tactic to get viewers. In the SOAR program, you do need to identify the specific things that cause trouble, but we do that only so we can treat them and stop them from causing trouble.
OneAnt		#2	[-]
Posts: 880 (09/04/09 09:27:30) Reply Quote More My Recent Posts	Aircraft shudder all the time at takeoff. Anything that happens all the time is never anything I'm concerned with. I honestly don't know why it happens. One of the pilots might be able to answer that one.
Capt Tom Bunn MSW LCSW		#3	[-]
Posts: 2698 (09/05/09 11:12:53) Reply Quote More My Recent Posts	There are a couple of things it could be. You may have had a wheel on your car that is out of balance, and you feel it at 50 MPH. Airplane wheels can get out of balance and when spinning at 150 MPH, just as small out of balance can cause a vibration on takeoff. Another possibility is the flow of air across the wing. The wing is perfectly shaped with the flaps are up, and the air flows across it just right. But the flaps, because they are movable and have to be retracted and away from the air at other times of flight, are not so perfectly shaped. They do the job of making the wing bigger, and more curved, so that the wing can produce more lift, but because the air flow when the flaps are used is not perfect, you can get some vibration - particularly when the flaps are being retracted.
OneAnt		#4	[-]
Posts: 882 (09/05/09 22:16:39) Reply Quote More My Recent Posts	I expect bumps and shudders from contact with the ground, but I tend to notice the shuddering immediately after we rotate and the wheels leave the ground. It's a very brief, momentary shudder that disappears within 2 seconds or so. I know what you're talking about when the flaps/slats are being retracted--I've felt that before--but this is when the flaps/slats are not moving at all; they're extended and the plane has just left the ground. Is it just resonance due to the change in vibration as the plane moves from the ground to the air--maybe a different vibration frequency? Always kinda wondered about this one myself, but never concerned enough to ask.
Capt Tom Bunn MSW LCSW		#5	[-]
Posts: 2699 (09/06/09 11:20:44) Reply Quote More My Recent Posts	OK. That make it clear. It is a wheel that is spinning out of balance. The reason it starts upon leaving the ground is that contact with the ground reduces the vibration. Once off the ground, the vibration increases. Then, as soon as the gear goes up into the wheel well, its rotation is stopped. That's why it disappears quickly.
yayinski	JW: TWO WORDS ABOUT SOAR	#6	[-]
Posts: 3 (09/08/09 17:57:31) Reply Quote More My Recent Posts	TRUST ME!!! Soar works wonder as it makes you aware of things. It helps you to separate fact from fiction, it allows you to distinguis between real danger (hardly at all) and imagined fear. I also thought that purchasing the program was going to doom me forever. I cannot say I am the happiest guy flying but I know accept flying for what it is and not for what it is portrayed in news, movies, etc. As my mom once told me, if flying wasn't safe, with the numbers of flights around the world that take place daily, don't you think that the ground would be full of holes from all the crashes? Flying isn't a 100 percent safe, but nothing is in life. Soat will make you UNDERSTAND that those stats that we fearful flyiers disregard (one crash per x million flights) whenver we board a plane. Again, two words, trust me. Best regards from Puerto Rico (The only way for me to travel is by plane since I live on an island :-)) good luck!!!

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Note from Capt. Tom

I know everyone worries about weather, but pilots really do not worry about it. We simply - instead of worrying about it - completely prepare for it. Before going to the plane, we review the weather at the destination. If it is not 100% sure to be within legal limits when we arrive at the destination, we must specify an alternate airport in our planning documents, and load on plenty of fuel for going to the destination airport, and then if need be, diverting to the alternate airport.

The legal limits are conservative. Even when weather is slightly outside the legal limits, any airline pilot could still land safely. You can rely on the captain never to land when the weather is not legal, and legality limits are reached prior to safety limits.

If you are still anxious, call me and we can talk it over. I'm at 877 332-7359 from 10 AM until 7 PM Eastern time.

For effective help, even if you are flying in a day or two, sign up now at www.fearofflying.com/fasttrack and call me when you finish Clip 9 so I can make sure you are all set.

Using Weather Information

If you enter your ZIP Code or City at the top of the weather presentation, it will give you weather for your area. Or, you can enter your destination ZIP Code or City.

Click on the "LOCAL RADAR" button to see whether or not there are thunder-
storms. Keep in mind, however, that we can either fly above the storms when cruising or fly through gaps between storms. During landing, we cannot fly above them, but fly through gaps, or through the area of the storms where the turbulence is least.

Turbulence, though it may cause anxiety, does not mean anything is wrong. Turbulence does not mean danger. The plane can handle far more turbulence than Mother Nature can dish out.

Though flying in turbulence is safe, it doesn't feel safe. And here is where the SOAR programs come in. We can help you feel as safe when you fly as you actually are.

You can see these programs at www.fearofflying.com/store.

For questions on aviation or the psychology of aerophobia, click here to e-mail Capt. Tom Bunn, MSW, LCSW.

To contact the SOAR business office (media contacts, brochures, replacement tapes, billing, shipping), click here to e-mail Lisa Hauptner, MS.