If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Soundwaves Boost Wing Lift
Here's some news that recently came out:
http://www.newscientist.com/article.ns?id=dn7867 http://abc.net.au/science/news/stories/s1439827.htm Apparently, soundwaves can help airflow stay near the wing and increase lift. This can help smaller aircraft to avoid stalling at lower airspeeds. Is this a technology that could be usefully applied to existing small aircraft? Or would it require some totally new design thinking? |
#2
|
|||
|
|||
" wrote in message ups.com | Here's some news that recently came out: | | http://www.newscientist.com/article.ns?id=dn7867 | | http://abc.net.au/science/news/stories/s1439827.htm | | Apparently, soundwaves can help airflow stay near the wing and | increase lift. This can help smaller aircraft to avoid stalling at | lower airspeeds. Is this a technology that could be usefully applied | to existing small aircraft? Or would it require some totally new | design thinking? It would also require heavy metal music. Well _somebody_ had to say it. -- Cheers Dave Kearton |
#3
|
|||
|
|||
I was thinking perhaps at least drones could benefit from this
technology, since they tend to be smaller and might have to travel at lower speed to do ground surveillance. Hmm, or what about at least toy RC hobby aircraft? Comments? |
#5
|
|||
|
|||
In article . com,
" wrote: Here's some news that recently came out: http://www.newscientist.com/article.ns?id=dn7867 http://abc.net.au/science/news/stories/s1439827.htm Apparently, soundwaves can help airflow stay near the wing and increase lift. This can help smaller aircraft to avoid stalling at lower airspeeds. Is this a technology that could be usefully applied to existing small aircraft? Or would it require some totally new design thinking? Here's a quote from the article in New Scientist (first reference above): "In wind tunnel tests, Salmon stuck sections of plastic piezo-electric film to wing segments. This film vibrates when an electrical signal is applied, producing sound." This sure sounds (no pun intended) like aftermarket stuff to me. It might find its way into production eventually, but it sounds like you could go stick some tweeters on your Cessna tomorrow and start landing at 35 knots. That'd raise a few eyebrows among the line judges. Of course, the best way to avoid stalls is to learn how to fly. No technology in the world is going to render pilot error obsolete. OK, I'll make one concession, for wind shear on final. It would be nice to stay airborne when dropping through the bottom of a 20 knot headwind layer. |
#6
|
|||
|
|||
On Sat, 20 Aug 2005 20:05:57 -0700, Richard Riley
wrote: On 20 Aug 2005 19:32:02 -0700, " wrote: :I was thinking perhaps at least drones could benefit from this :technology, since they tend to be smaller and might have to travel at :lower speed to do ground surveillance. : :Hmm, or what about at least toy RC hobby aircraft? He he he. It'd drive the people writing the requirements nuts. I just read an RFP for UAV's. One requirement was that it couldn't be detected by the human ear from directly below at 4000 AGL. But another was that it have all the necessary equipment to operate in the airspace. And THAT meant strobes and position lights. So when the bad guys can see strobes in the sky and can't hear it, they know for sure it's one of the drones. The Stealth Fighter and the Stealth Bomber both have position lights, strobes, and landing lights. This isn't to say they leave them on all the time.... Ron "Activate cloaking device" Wanttaja |
#7
|
|||
|
|||
Richard Riley wrote:
In the airspace for this program, they had to leave them on all the time, along with their transponder - which had to have a mode that I'd never seen before, mode 3. This program wasn't for a battlefield, it Um, serious question: are you being serious that you have never seen Mode 3? You probably have, but by a different name. Mode 3 is your plain vanilla 0000-7777 transponder (if it has altitude reporting technically is is Mode 3/C). Modes 1,2 and 4 are military systems (in the free world anyway). 1 and 2 are similar to 3, and 4 is also known as IFF (identify friend or foe, although in function it is more like identify friend and everyone else is a regular radar blip). |
#8
|
|||
|
|||
Well, could this technology be used to augment the performance of
canards? We know that aerobody designs that are optimized for high-speed supersonic flight may unfortunately not be so efficient for low-speed flight around takeoff and landing. Could this sonic lift technology be used instead of canards, or maybe to boost the lift from canards? Then maybe you could have smaller canards at least, although I'm not sure liability canards pose to begin with. Also I don't know what you'd do in the event of an unpowered landing. I was also thinking about how stubby-winged re-entry vehicles like the old X-15 or even the new SpaceshipOne might benefit from that 20% increased lift. What about using this technology for something more exotic, like a martian aeroplane? With the thinner atmosphere producing less lift, perhaps this sonic boost might make a crucial difference. |
#9
|
|||
|
|||
"Richard Riley" wrote in message
... I can see it now, Threshold numbers - 140 kt dash speed, 16 hours endurance, 1500 AH available power, 300 lb payload, 500 watt surround sound system, 5g flash memory with Ozzy Ozborn's Greatest Hits. Oh Lord, let it be so. Let Thy lift elevate that *&^%$ in the Mitsubishi, with the 16" bass speaker, that drives by my house at 2 am, unto Thy bosom and keep him forevermore. Selah. Rich "Ever hopeful" S. |
#10
|
|||
|
|||
There is one other significant fact not mentioned. Turbulent drag,
basically a fluid flow is highly unstable. There is the classical statement of the butterfly in Japan causing a hurricane in the Gulf. This represents the control of chaos. Stalling represents the complete breakdown of laminar flow. So it will not only improve stall performance, it will (potentially) reduce fuel consumption. Turbulent drag is caused by vorices in an unstable fluid flow. Fewer vortices = more kilometers, fewer liters. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Who does flight plans? | Michael 182 | Piloting | 158 | July 4th 05 02:50 AM |
Lift Query | Avril Poisson | General Aviation | 8 | April 21st 05 07:50 PM |
Tamed by the Tailwheel | [email protected] | Piloting | 84 | January 18th 05 04:08 PM |
A Level 1 AOA clarification | Ramapriya | Piloting | 64 | January 9th 05 01:19 AM |
Props and Wing Warping... was soaring vs. flaping | Wright1902Glider | Home Built | 0 | September 29th 03 03:40 PM |