Kip Powick Posted March 31, 2018 Share Posted March 31, 2018 Video of a new type of aircraft...lots of info on the builders website. Must be a thrill to fly and aircraft where the service ceiling is about 21 -22 feet !!! Wonder how long it will be until someone does a steep turn....... unless the controls are locked out so that can't happen... Website and many videos................... http://www.wigetworks.com/airfish-8/ Link to comment Share on other sites More sharing options...
Guest Posted March 31, 2018 Share Posted March 31, 2018 2 hours ago, Kip Powick said: Video of a new type of aircraft...lots of info on the builders website. Must be a thrill to fly and aircraft where the service ceiling is about 21 -22 feet !!! Wonder how long it will be until someone does a steep turn....... unless the controls are locked out so that can't happen... Website and many videos................... http://www.wigetworks.com/airfish-8/ seems that they tested for that: http://www.wigetworks.com/wing-tip-strike/ Link to comment Share on other sites More sharing options...
J.O. Posted March 31, 2018 Share Posted March 31, 2018 It’s interesting but I don’t know how practical it can be. Link to comment Share on other sites More sharing options...
Guest Posted March 31, 2018 Share Posted March 31, 2018 55 minutes ago, J.O. said: It’s interesting but I don’t know how practical it can be. Fast water taxi comes to mind or perhaps a replacement for short haul float plane operations such as Vancouver to Victoria etc. Link to comment Share on other sites More sharing options...
Kip Powick Posted March 31, 2018 Author Share Posted March 31, 2018 1 hour ago, Malcolm said: Fast water taxi comes to mind or perhaps a replacement for short haul float plane operations such as Vancouver to Victoria etc. The moment you get high winds and rough water....you may have a problem ..... Link to comment Share on other sites More sharing options...
Guest Posted March 31, 2018 Share Posted March 31, 2018 2 hours ago, Kip Powick said: The moment you get high winds and rough water....you may have a problem ..... same landing and taking off on floats..... But of course once airborn the plane doesn't need to worry about following seas etc, I bet you could draw up a list of items this boat/plane needs to overcome. I see one of the videos shows it operating in fairly rough water (into rainstorm 1). But it would be interesting to see it's operating limits. It always amazing me what can be found on the internet. Quote The ability of a ground effect (air)craft to able to fly with (small) perturbations in height from the ground is called height stability. In general, height stability is achieved if the derivative of the lift coefficient with increasing height is negative. In this case, a decrease in height (due to waves etc.) causes an increase in lift. As a result, the aircraft is returned to its original height due to the increased lift (with the opposite happening when height is increased). As the ground effect increases as the height decreases, designing the ground effect aircraft with height stability is not very difficult and most of the ground effect aircraft designed and operated have height stability. A good example is the Lun Ekranoplan, which returned to its height after the height was altered by approximately 0.5m (due to missile launch). "Lun Ekranoplan" by Soviet Navy - Stock Archives of Soviet Navy. Via Wikipedia. Also, the Sea state limitations are a scale phenomenon — the larger the ground effect aircraft, rougher the seas it can handle. The Russians (Soviets) have the most experience in operating ground effect vehicles and according to them, sea state limit for a 500-tonne aircraft is around 2.5 m and the safe operating heights in terms of mean wave heights is given by, h=1.54H 13 2 +0.1c h=1.54H132+0.1c where, h h is the vertical height measured from the mean wave height, c c is the chord, H 13 H13 is the average of the 1/3 highest wave. When this height exceeds the ground effect height the craft operates as an aircraft at a lower efficiency. The main problems in case of operating a ground effect aircraft in choppy waters (as you noted, they are mostly operated in 'calm' seas) are twofold: Takeoff and landing are dangerous in rough seas, due the impact loads on the hull and wings. This is the most important limitation for operating in rough seas. Stability — The wing is already unstable, and near the ground in high lift region, it is more so; this is the reason most of the ground effect vehicles have proportionally larger tail surfaces compared to the conventional aircraft. A good example is the Soviet -90 'Orlyonko', which had tail surface nearly 50% of that of the wing. "A-90 Orlyonok" by Kaboldy - Own work. Licensed under CC BY-SA 3.0 via Commons. The main problem with waves (or in general, variations in height) is that the pitch stability changes with height. This results in the requirement of a large amount of control power in order to maintain trim — another reason for large tail control surfaces. Generally, the aircraft is stable in roll (the dipping wing generates more lift and the aircraft corrects itself). Another thing to note is that the maneuverability of the ground effect aircraft is pretty limited if it's unable to fly in OGE (Out of Ground Effect). Soviet GE aircraft could fly in OGE for clearing obstacles. References: Wing in Ground Effect Craft Review by Michael Halloran and Sean O'Meara share|improve this answer edited Sep 11 '17 at 19:58 Nathan Tuggy 2331313 answered Nov 8 '15 at 23:44 aeroalias 81.2k4205345 for clarification: the height h is the lower safe height, the craft operates in a band between h and the ground effect height that's roughly the wingspan? (so when h > wingspan, it's an inefficient plane)? What does "the wing is already intsable" mean? What does OGE mean? This answer looks great, I just want to understand a few more details! – mart Nov 9 '15 at 6:56 @mart When h>wingspan, the aircraft operates just like any other conventional aircraft. The advantages due to ground effect are lost. Compared to ground effect aircraft, they are inefficient. Wing alone configuration is unstable. That is the reason for having a horizontal stabilizer- to make the aircraft stable. OGE means Out of Ground Effect. – aeroalias Nov 10 '15 at 3:39 Link to comment Share on other sites More sharing options...
Super 80 Posted March 31, 2018 Share Posted March 31, 2018 4 hours ago, Malcolm said: Fast water taxi comes to mind or perhaps a replacement for short haul float plane operations such as Vancouver to Victoria etc. You first. Link to comment Share on other sites More sharing options...
Seeker Posted March 31, 2018 Share Posted March 31, 2018 I can't see the machine costing any less than a proper airplane and it's greatly hobbled in what it can do so why bother. It's funny watching the company videos - the guy in the left seat is wearing airline-style epaulettes. Is he a pilot? What training does he have? What licence to operate the machine? If he is a pilot why not just get a C-208 and if he isn't a pilot how is he insured/checked/trained? Link to comment Share on other sites More sharing options...
Guest Posted March 31, 2018 Share Posted March 31, 2018 1 hour ago, seeker said: I can't see the machine costing any less than a proper airplane and it's greatly hobbled in what it can do so why bother. It's funny watching the company videos - the guy in the left seat is wearing airline-style epaulettes. Is he a pilot? What training does he have? What licence to operate the machine? If he is a pilot why not just get a C-208 and if he isn't a pilot how is he insured/checked/trained? and why do we care except for having inquiring minds. Link to comment Share on other sites More sharing options...
st27 Posted March 31, 2018 Share Posted March 31, 2018 Or get one of these: https://www.google.ca/search?rlz=1C9BKJA_enCA725CA725&hl=en-US&q=rescue+hovercraft+for+sale&sa=X&ved=2ahUKEwjNx8v81ZfaAhUCCawKHYfUBj0Q1QIoBnoECAcQBw&biw=1024&bih=748#imgrc=2xFjvQtuxId2RM: Link to comment Share on other sites More sharing options...
boestar Posted April 3, 2018 Share Posted April 3, 2018 Wing in Ground effect is nothing new. as posted above the Caspian Sea Monster has been around for a long time. there are smaller versions already in service. WIGE is a very efficient method of flying. Link to comment Share on other sites More sharing options...
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