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#22
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Thanks for the additional information - Dan high, hot, and slipping like crazy High: correct, but as I will explain later high is better than low. Hot: A normal power-off landing need not be any hotter than than a powered approach. I was taught to come in with normal approach speed. Cub D. comes in hot because there is no runway too short for a cub and he is using the kenetic energy as a safety buffer instead of power. The same buffer can be provided with potential energy (coming in high) Slipping: Not needed unless your flaps are boken. Cub driver uses slips because he is experienced and practices this (Also because he likes them). Dave already explained how his wife made the runway with an extemely high approach. And what happens when you eventually hit an updraft? If you're already high On a peice of paper draw a side view of the runway, a high approach and a low approach. You will see that *minor* changes in the approach angle with the low approach has a *major* change on your touch-down spot. The same angle change of a high approach has a *minor* change on the touch-down spot. For example: presume that you come in with a powered-approach that has a glide angle of 40:1 and Mr. C150 comes in with a high approach that has a 10:1 glide angle. If an updraft raises you 50 feet, your touch down spot has moved 2000 feet. If that same updraft raises Mr. C150 50 feet, his touch down spot only moves 500 feet. When I was being taught power-off approaches 30 years ago, I asked my instructor the same question about getting too high. He setup an approach that was so high above the numbers, I didn't think we would make the other end of the runway. He pulled full flaps and I was amazed at how short we landed. and you will need to go around. I have been flying power-off landings and have not done a go-around in 30 years. Here's a bit of reality - unless you run out of gas, it is highly unlikely... I agree with you completely. Due to the unlikely nature of a power failure, maybe it has been proven that a powered approach is safer; maybe not. I don't know. That is why I asked the original question. However, here is another bit of reality from Wolfgang Langewiesche, "But meanwhile it can't be denied that engine failure, though very unlikely, is very serious if it does happen, and that the accuracy of his power-off approach can thus suddenly become the most important thing in he pilot's life." Even a 767 was successfully landed with no power because the pilot had extensive practice in power-off landings. http://www.wadenelson.com/gimli.html My main point is that if you don't practice power-off landings when your power works, you won't be able to do it when the the power doesn't work. Marty Pautz "promote a society that respects its elders; before it is too late." all the best -- Dan Ford email: (put Cubdriver in subject line) The Warbird's Forum www.warbirdforum.com The Piper Cub Forum www.pipercubforum.com Viva Bush! weblog www.vivabush.org |
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