Helicopter payloads

[jcf]

There's another factor allowing the increases in weight- airframe and payload,
as they've gone up so has the number of rotorblades and available engine power.

The two 3-bladed rotors of the Chinook are less effective than the single
7-bladed rotor of the CH-53E, the abandoned Boeing XCH-62 was to use
two 4-bladed rotors. The 4-blade concept was tested on the Model 347
"winged Chinook" and the primarily composite Model 360 technology
demonstrator, in the latter case wide chord blades were also tested.




As large as the Mi-6, Mi-10, and Mi-10K are, they only have 5-bladed
rotors, relying on blade size and sheer engine grunt, the massive Mi-26
has an 8-bladed rotor.

[jcf]

Speaking of Boeing heli-cranes the early Model 298 design
and the Chinook Crane.

[NARSES2]

Interesting illustrations Jon 

Maybe a naive question, but when a helicopter has "winglets" as has that "winged Chinook" at what point does it cease to be a helicopter and become a VTOL aircraft ?

[Old Wombat]

Interesting illustrations Jon 

Maybe a naive question, but when a helicopter has "winglets" as has that "winged Chinook" at what point does it cease to be a helicopter and become a VTOL aircraft ?

No expert but I'd say when the majority of the lift/propulsion is no longer being provided by rotary wings.

[jcf]

Interesting illustrations Jon 

Maybe a naive question, but when a helicopter has "winglets" as has that "winged Chinook" at what point does it cease to be a helicopter and become a VTOL aircraft ?

It remains a helicopter with auxiliary wings that partially off-load the rotor,
but do not provide the majority of lift. It's not a convertiplane, in that case
the wings do provide the majority of the lift allowing higher fwd speeds.
The wings on the 347 rotated on their long axis so the rotor wash
didn't beat down on them.

[NARSES2]

Thanks gents 

[PR19_Kit]

The wings on the 347 rotated on their long axis so the rotor wash
didn't beat down on them.

So it took off with the wings vertical? Very clever............ 

I wonder if I could do that with a later version of the Rotocrane?

[jcf]

The wings on the 347 rotated on their long axis so the rotor wash
didn't beat down on them.

So it took off with the wings vertical? Very clever............ 

I wonder if I could do that with a later version of the Rotocrane?

[PR19_Kit]

That does look an awesome piece of kit. 

Thanks JCF.

[jcf]

 

[NARSES2]

That does look an awesome piece of kit. 

Thanks JCF.

Does indeed and one I wasn't even vaguely aware of