tag:blogger.com,1999:blog-4352001774241033758.post8088418382885276903..comments2024-02-11T21:32:26.411-08:00Comments on Quadcopter Flight School: Vortex Ring State (The Wobble of Death)Unknownnoreply@blogger.comBlogger15125tag:blogger.com,1999:blog-4352001774241033758.post-44194580693998117532017-02-02T20:17:30.341-08:002017-02-02T20:17:30.341-08:00this is great stuff Q101, thanks for your dedicati...this is great stuff Q101, thanks for your dedication and time to this! consider me enrolled! Regards from FLorida <br /><br />-goosey Anonymoushttps://www.blogger.com/profile/10687571958206230588noreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-44664514412655330012017-01-31T03:21:33.177-08:002017-01-31T03:21:33.177-08:00ThanksThanksAnonymoushttps://www.blogger.com/profile/04571828795230778384noreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-43296686721286060472016-06-27T11:31:08.518-07:002016-06-27T11:31:08.518-07:00This comment has been removed by the author.rcgldrhttps://www.blogger.com/profile/02879556894377738829noreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-78091403658718699212016-06-27T04:07:40.863-07:002016-06-27T04:07:40.863-07:00Part of a vortex ring state condition involves upw...Part of a vortex ring state condition involves upwash near the hub (inner portion) of the rotors. This results in a stalled condition near the hub, and combined with the vortex ring at the outer edge of the props, there's insufficient lift to stop the descent.<br /><br />http://en.wikipedia.org/wiki/Vortex_ring_state#Description<br /><br />In the case of high power to weight ratio 3d models (or a full scale Sky Crane helicopter), there's enough excess power so that a high powered strong induced downwash at the outer portions of the props combined with viscosity result in the downwash quickly moving inwards, overcoming the upwash, eliminating the stalled condition by literally powering their way out of vortex ring state. This is why high powered 3d models can perform rapid collective transitions without any lateral movement.<br /><br />However as pointed out in the video, many models don't have sufficient power to power out of vortex ring state, so lateral motion is needed to reduce the induced downwash related tip vortices so there's enough lift to overcome the stalled condition at the hub of the prop.rcgldrhttp://rcgldr.netnoreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-59336791434186152612016-04-16T02:26:11.213-07:002016-04-16T02:26:11.213-07:00It has happened to me once. A small, very light, o...It has happened to me once. A small, very light, overpowered micro quad smashed in to the ground even when I applied full throttle for at least 20 meters. That throttle would have normally pushed it to orbit :) I was standing close and heard that the motors were operating at max.<br /><br />Usually it's just heavy shaking though on very small quads.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-10131322806578898622016-03-08T00:19:40.460-08:002016-03-08T00:19:40.460-08:00Excellent explanation!
I wanted to ask for permi...Excellent explanation! <br /><br />I wanted to ask for permission to copy and translate this video to spanish in order to reach the audience at my country. Not sure if through subtitle or a spanish audio. The credits would go to you and your site as I would only be the translator and if someone wnatsto see any other of your videos and feels fluent at english he could come here and watch any of the other videos. Would this be ok?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-91644373531720187652015-08-30T16:59:22.937-07:002015-08-30T16:59:22.937-07:00small rotors and low weight make them less suscept...small rotors and low weight make them less susceptible, but as long as it has rotors it can enter vrs.Unknownhttps://www.blogger.com/profile/11023686724285326515noreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-16331311644554995352015-08-30T16:57:09.485-07:002015-08-30T16:57:09.485-07:00it can, but shouldn't be very common.
you'...it can, but shouldn't be very common.<br />you'd probably have some very unfortunate wind conditions though, or if you're descending while moving forward at just the right speed to let the "rear" rotors get caught in the turbulence of the "front" rotors.Unknownhttps://www.blogger.com/profile/11023686724285326515noreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-17462321619330983622015-04-28T05:30:42.046-07:002015-04-28T05:30:42.046-07:00Is this possible on just 1 or 2 props while turnin...Is this possible on just 1 or 2 props while turning causing a flip instead of a decent?<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-11480115716796474492015-02-18T15:12:53.608-08:002015-02-18T15:12:53.608-08:00Brilliant, that's why that happened to my heli...Brilliant, that's why that happened to my helicopter! Thank you for sharing that. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-33053551601830609632015-01-14T19:07:17.406-08:002015-01-14T19:07:17.406-08:00Looking into this a bit more, I found that rotatin...Looking into this a bit more, I found that rotating blades are just one of many things that can produce Vortex Rings. Sea mammals, volcanos, humans, cannons, etc. can also make them. Here's an interesting video titled: Extraordinary Toroidal Vortices (aka Vortex Rings). https://www.youtube.com/watch?v=mHyTOcfF99o<br />From what I understand, the only difference is that a rotating blade can produce a sustained vortex. <br />More info on Wikipedia: http://en.wikipedia.org/wiki/Vortex_ring<br />Thanks for an very interesting chapter.<br />Doug in AZ<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-53973223184388536842014-12-25T09:57:10.107-08:002014-12-25T09:57:10.107-08:00This makes sense even to a novice who knows the ba...This makes sense even to a novice who knows the basics of 'lift' (pressure under a wing greater than above it) in an airplane wing, kite, or blades of a copter. The 'vortex ring' is turbulence right where your copter blades are ... so to get air under the blades that is not turbulent, glide away to some side (any direction) into undisturbed air. To me, it's somewhat like what you should do in 'undertow' that takes you down the beach. Gradually glide with it to save energy and think straight but to an angle to get out of the water current 'stream' that is towing you away. I hope this helps. Blackdoghttps://www.blogger.com/profile/06981455853819606656noreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-4884426553225260002014-12-25T01:07:02.829-08:002014-12-25T01:07:02.829-08:00Hello, i would like to share your articles on my b...Hello, i would like to share your articles on my blog with a link to your blog.<br />please contact me at: henryberker@gmail.comAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-27588525215567404182014-12-24T17:40:15.293-08:002014-12-24T17:40:15.293-08:00Yes it can, especially if it's overloaded. Vie...Yes it can, especially if it's overloaded. <a href="https://www.youtube.com/watch?v=1zR4LHe7ufk" rel="nofollow">View micro overloaded with camera.</a> Camera Repairhttps://www.blogger.com/profile/01260622716502547900noreply@blogger.comtag:blogger.com,1999:blog-4352001774241033758.post-59715369817859610132014-12-24T11:27:24.492-08:002014-12-24T11:27:24.492-08:00Does this happen to small quads?Does this happen to small quads?Anonymoushttps://www.blogger.com/profile/09268921759421593454noreply@blogger.com