Fa 223 Drache - Why was the construction so strange?

Dec 2017
307
Poland
#1
Fa 223 Drache - Why did this helicopter have rotors on its sides? I understand that if a helicopter has two rotors, it does not have to have a tail rotor. But CH-47 Chinook looks different.
 

Chlodio

Ad Honorem
Aug 2016
3,239
Dispargum
#2
They started with a traditional airframe and changed the wings from fixed to rotary. It's more obvious if you look at the earlier FW-61. The traditional airframe was designed to be supported by wings on either side. If they had attached the two rotors front and back like a Chinook, the airframe probably would have folded up and collapsed since it wasn't designed to bear weight and stress that way. Innovation usually evolves one step at a time. The first evolution was to change the wing from fixed to rotary. Changing the wing's point of attachment came later.

Focke-Wulf Fw 61 - Wikipedia
 
Likes: Zbigniew
Dec 2017
307
Poland
#3
If they had attached the two rotors front and back like a Chinook, the airframe probably would have folded up and collapsed since it wasn't designed to bear weight and stress that way.
Indeed, I forgot about it! And how was the engine cooled in Fa 223 Drache? In the FW-61 there was an engine in the front and the propeller was pushing the cold air into the engine.
 

Willempie

Ad Honorem
Jul 2015
4,378
Netherlands
#4
Compare it with current drones. It is much easier to control with 2 (or in the case with drones 4) horizontal rotors. Further advantages:
-All power goes up
-Liftoff is easier (big problem with early helicopters)
-You can set the two rotors up so that they are in sync.

of course this became a bit obsolete when they found out that if you tilt the a single horizontal rotor things become much easier with a tail-helicopter.
 
Likes: Zbigniew