gambit
PROFESSIONAL
- Joined
- Apr 28, 2009
- Messages
- 28,569
- Reaction score
- 148
- Country
- Location
There are four classes of helos:
* Single
* Coaxial
* Intermeshing
* Tandem
The single main rotor is the most well known type, from the venerable Huey to the other Bells popular with civilians in news organizations, police forces, and medical transports.
The coaxial type is practically unheard and unseen today. This type has two rotors atop each other. The main performance issue with the coaxial is that the wash from the top rotor affects the lower. If the two rotors are close enough to each other, they can interfere in flight, resulting in a catastrophic failure.
The intermeshing type is when there are two rotors in the same plane and their rotating blades weaves between each other in motion. Obviously, the engineering for the intermeshing type must be complicated and precise enough. The main advantage for the intermeshing type over the single and coaxial is superior lift for slightly greater rotor area. Unfortunately, the greater mechanical complexity and maintenance demands of the intermeshing type offset the superior lift advantage, leaving the single type the most affordable and easiest to maintain.
The tandem type is where the Chinook and the new Osprey belongs. The Chinook has the advantage over the Osprey in that its longitudinal, or fore-aft, rotor arrangement with the aft rotor in a higher plane than the fore allow both rotors to overlap each other in motion without the mechanical complexity of the intermeshing type. The Osprey's lateral, or side-by-side arrangement, must have both rotors in the same plane, resulting in a greater total rotor area. It is noteworthy that the Osprey is fully capable of all flight modes with a single engine.
Note -- To date no one has yet to come up with an odd number rotors helo, except for the single main type. If there is going to be more than one, so far there are two and four rotors. And if there is going to be more than one rotor, the pair must rotate in opposite directions.
* Single
* Coaxial
* Intermeshing
* Tandem
The single main rotor is the most well known type, from the venerable Huey to the other Bells popular with civilians in news organizations, police forces, and medical transports.
The coaxial type is practically unheard and unseen today. This type has two rotors atop each other. The main performance issue with the coaxial is that the wash from the top rotor affects the lower. If the two rotors are close enough to each other, they can interfere in flight, resulting in a catastrophic failure.
The intermeshing type is when there are two rotors in the same plane and their rotating blades weaves between each other in motion. Obviously, the engineering for the intermeshing type must be complicated and precise enough. The main advantage for the intermeshing type over the single and coaxial is superior lift for slightly greater rotor area. Unfortunately, the greater mechanical complexity and maintenance demands of the intermeshing type offset the superior lift advantage, leaving the single type the most affordable and easiest to maintain.
The tandem type is where the Chinook and the new Osprey belongs. The Chinook has the advantage over the Osprey in that its longitudinal, or fore-aft, rotor arrangement with the aft rotor in a higher plane than the fore allow both rotors to overlap each other in motion without the mechanical complexity of the intermeshing type. The Osprey's lateral, or side-by-side arrangement, must have both rotors in the same plane, resulting in a greater total rotor area. It is noteworthy that the Osprey is fully capable of all flight modes with a single engine.
Note -- To date no one has yet to come up with an odd number rotors helo, except for the single main type. If there is going to be more than one, so far there are two and four rotors. And if there is going to be more than one rotor, the pair must rotate in opposite directions.
obviously we are thankful to support by us on the matter but really what kind of ally is that that does not gives us helicopters or air defence and we have to deal with drones ?
