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| General RC Aircraft Discussion Discuss anything RC related |
Topic Review (Newest First)
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| 09-28-2015 08:12 PM | ||
| OLD PRAIRIE RED NECK |
Re: Aerodynamics trivia questions [quote=moo;2561602] Quote:
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| 09-28-2015 11:01 AM | ||
| moo |
Re: Aerodynamics trivia questions [QUOTE=Mike Sebastien;2561066]Here is what I found. Noise reduction and improved lift/drag Like owl wings, clever |
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| 09-28-2015 10:59 AM | ||
| moo |
Re: Aerodynamics trivia questions Quote:
look up Coandă, von Kármán, and Micheal Selig for theories only decades old |
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| 09-28-2015 06:55 AM | ||
| OLD PRAIRIE RED NECK |
Re: Aerodynamics trivia questions Thanks Mike! Some interesting reading there. I wonder if it has been incorporated into aircraft design. I also am thinking there could be something to gain by modifying props this way. |
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| 09-27-2015 11:02 PM | ||
| Mike Sebastien |
Re: Aerodynamics trivia questions Here is what I found. Noise reduction and improved lift/drag http://www.google.com/patents/US5088665 |
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| 09-27-2015 07:54 PM | ||
| OLD PRAIRIE RED NECK |
Re: Aerodynamics trivia questions Not much action on this thread lately so I thought I would try waking up the inquiring minds with this puzzle. I was driving by some wind charger blades today and I understand what vortex generators do but the little triangles on the trailing edges near the tips have me a bit puzzled. Are they for efficiency gains or is it some noise suppression device? The last picture shows them and they run from the tip to about 1/2 the way to the root. |
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| 05-20-2015 01:26 PM | ||
| Flydynamics |
Re: Aerodynamics trivia questions Quote:
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| 05-20-2015 01:11 PM | ||
| bcsaltchucker |
Re: Aerodynamics trivia questions Quote:
The Rutan Vari-EZ was the first to put winglets into practice. What a genius that guy is. Now he is working on a seaplane with huge shock absorption system. |
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| 05-20-2015 12:16 PM | ||
| CF105 |
Re: Aerodynamics trivia questions The Soviets did a lot of work with "Wing in Ground Effect" designs. Google "Caspian Sea Monster" or "ekranoplan" (my spelling of that is dodgy!). Interesting stuff. |
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| 05-20-2015 09:24 AM | ||
| kip51035 |
Re: Aerodynamics trivia questions The total effect of ground effect is when the wing is half its span or less from the ground. Beyond that it diminishes quite quickly. With a rotary wing aircraft it is effective at 1/2 the main rotor span. It has the effect of extra lift and makes the aircraft float until speed bleeds off and lift diminishes. I was in a hotel room in Toronto, my room faced the airport and I could see the runway clearly. The aircraft were landing every five minutes. It was snowing lightly I could clearly see the wing tip vortices. The initial effect on the vortices was to flatten the bottom. I could clearly see the the ground effect and at touch down the aircraft would disappear in a cloud of snow. The ground effect was first noticeable in the flap area and quickly spread to the wing tips. The ground effect on a high wing aircraft was a lot less noticeable. Believe it or not the DC9/ MD11 style aircraft made the largest vortices. It was quite the thing to see. |
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