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Lets hope smash replies
This calls for a Vertical flight system rather than a Horizontal flight system as far as lift is concerned.
Looks like you're preparing for the Shaastra Aerobotics competition.....I personally feel that the Problem statement is a little too superfluous for a student project. As usual, the competition will end up with no true contenders and the rules will be changed impromptu.Let us examine the problem: Since no dimensions are posted, lets assume the shaastra event as the base:-1. Line following is difficult for a flying object- the more it is above ground the more unreliable it will be.2. Normal Line following techniques with conventional sensor systems become incompetent , as the distance up from ground increases.3. The machine must have a very fast reaction time indeed.Since the dimensions have not been mentioned, we must assume that the Flying object should be as small as possible. If it is small, then it should be quite powerful to take the payloads of sensors and the additional electronics for line following/ flight control. As the dimension of the line is not known, one must consider the possibility of a " Line " < 10% of the bot size, or a " Path " which is >25% of the bot width.In general, Flying objects - whether Plane, Heli or G effect machines are highly unstable in nature. So, the maximum effort is towards the construction and control of the machine, before sensor management techniques.To summarise::You need a Bot that must do these things-- Small , Light , Powerful and VERY stable. - capable of slow flight- fast sense and control designThis calls for a Vertical flight system rather than a Horizontal flight system as far as lift is concerned.A Hovercraft fits the bill quite nicely indeed and is the only easy way our for an amateur/ student implementation.Reasons??1. It has natural Height control and will maintain it quite accurately. 2. Similar to a Ground vehicle so the wheeled line following techniques are enough.3. Weight and size does not matter at all4. The problem is the Skirt- but it may not matter....Good Luck !!!