tahoeskywagon wrote:i have a cessna 180. i always avoid landing with any tailwind component. i've been thinking it would be a good idea to practice landing & taking off with a small tailwind component & was wondering if any of the tailwheel pilots ever practice this.
kelly
south lake tahoe
I've been flying taildraggers for 38 years, and I will do nearly ANYTHING to avoid a downwind landing of more that 5 kts, especially at altitudes well above sea level. I would consider landing my 180 with a 10 kt tailwind to be an emergency situation.
I know pilots who fly for a living have a different attitude, but for my purely pleasure flying, there just is not any reason to do this. Call me a wimp, I don't care. 5000 hours of experience has taught me that I'm not NEARLY as good as I thought I was.
Remember, the ground looping tendency goes up as the
square of the groundspeed increase, so if you normally touch down at 45 kts, a 55 kt touchdown is 100 times more likely to produce a groundloop, not 10! Go up to a density altitude of 8000 feet on a hot day in the mountains with a 10 knot tailwind for a touchdown groundspeed of 70 kts and you are 625 times more likely to lose it!
This has not really been scientitifically proven, but it serves as a good rule of thumb. Many groundloop accidents involve a pilot used to landing at near sea level making a landing at high elevation and not paying enough attention to the wind. I learned and flew my first 2,500 hours at airports between 5,000 and 8,000 feet, and we just simply DID NOT EVER land downwind in a taildragger. Downhill, yes, but never downwind in more than a light breeze (below 5kts) and NEVER, NEVER, EVER downhill AND downwind. I was taught by a guy with 20,000 + hours in TD's and this was what he drilled into my brain from day one. Taildraggers have enough groundlooping risk as it is, why do anything to increase it unless it is unavoidable (read emergency). Don't let yourself get herded into that situation.
If you want to practice a LITTLE downwind, pick a low elevation grass airport on a stable day with less than 5 kts of wind, land into the wind a couple of times, note the distance, then try it downwind. It will be roughly twice the groundroll! On pavement, it is important to reduce that rolling speed ASAP without skidding the tires. Groundlooping below 30kts is far less likely, unless a bad gust hits you.
Regardless of winds or elevation, I always try to minimize the time spent above 30 kts in ground contact. And, yes, I do go through my brake pads a little faster than some, but I think it's a very good trade-off. If I was flying a Stearman, my attitude would be different, but my 180 brakes very smoothly and controllably, so why not use them?
Take-offs with a tailwind are pretty much of a non-event from a groundlooping standpoint, as you have all that propwash on the rudder, so usually when the tailwind is too strong from a controllability standpoint, it is
way too strong for your climb-out performance. Don't forget the performance loss from climbing into a rapidly increasing tailwind component.The only time I really scared myself in the last ten years was exactly that scenario...less than 5 kts on the ground, but 25 kts at 150 feet! She just completely quit climbing, forcing me to dodge between some trees and dive into the river canyon for a couple of hundred yards to get some more airspeed. Luckily I had planned for exactly that scenario and knew exactly where the decision to jink and dive had to be made, or I wouldn't be posting this.
Regards,
Rocky