Lift fan VTOL aircraft

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8 years 5 months

Posts: 13

There are two new lift fan designs. One is the Boeing Phantom Swift, which uses two internal lift fans and two wing tip ducted fans.Here is the picture:

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQJ1eti53Fdm0hl3boEoH_eV3D7Ia6O6-5wG1m0R7uF1Wyke49UbQ

Another one is an annular ducted lift fan VOTL aircraft, which uses one annular duct:

https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcTs6TIucq8R95gUU1gdaFYJM6DHshzBgAUQ-h4wbJdIcZ54AsEh

http://www.mdpi.com/2226-4310/2/4/555/htm

Which design is better?

Original post

Member for

9 years 8 months

Posts: 584

The first one. If one wing tip fan fails then control would be rather labour intensive. The Kestrel/Harrier series had the thrust-lines close to the centre-line to reduce assymetry. Even then, they could be a handful at times.

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14 years 7 months

Posts: 3,094

what's new
https://s-media-cache-ak0.pinimg.com/736x/bf/bc/0d/bfbc0deadba5e1b01c224342dd4b6de1.jpghttp://xplanes.free.fr/omni/images/vanguard_2c_02.jpg

Member for

9 years 8 months

Posts: 584

The top picture, I think the fiscal number is a bit of a clue.

Member for

15 years 5 months

Posts: 6,983

There are two new lift fan designs. One is the Boeing Phantom Swift, which uses two internal lift fans and two wing tip ducted fans.Here is the picture:

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQJ1eti53Fdm0hl3boEoH_eV3D7Ia6O6-5wG1m0R7uF1Wyke49UbQ

Another one is an annular ducted lift fan VOTL aircraft, which uses one annular duct:

https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcTs6TIucq8R95gUU1gdaFYJM6DHshzBgAUQ-h4wbJdIcZ54AsEh

http://www.mdpi.com/2226-4310/2/4/555/htm

Which design is better?

i rather like the simplicity of the 2nd design, i hope its built so we may see how it perform, and how it can be improved

Member for

8 years 6 months

Posts: 906

Well what's the requirement ? that's when things can get fair.

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Design wise though im not really a fan of "In body" ducted fan as it's awkward and somewhat limiting payload.

The second design, well.. Hiller VZ-1 anyone :3 ?

[ATTACH=CONFIG]242082[/ATTACH]

Control for 2nd design might be similar as VZ-1

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Member for

9 years 8 months

Posts: 584

It has 'pop-up'and 'look-down' features.

Member for

15 years 5 months

Posts: 6,983

i'm in awe, i didnt know it was built already

Member for

17 years 7 months

Posts: 4,951

Imagine what Hiller's design would look with three axis tilting ring rather than its two dimensional paddles. Can't be any less efficient than a one-man helicopter.

Member for

8 years 5 months

Posts: 13

Hiller's design can go up and down. It cannot fly forward quickly.

The TriFan has three fans. How to balance the torque of the third fan?

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14 years 3 months

Posts: 3,259

make it double counter-rotative and you have no torque to fight against

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24 years 2 months

Posts: 1,732

Don't forget the Airmule:
http://www.tech2date.com/wp-content/uploads/2011/05/israeli-flying-car.jpg

Member for

15 years 5 months

Posts: 6,983

the first design is junk from start to finish, Osprey already exist and does it better,
however i want to see how the 2nd design perform, with the outer frame counter balance the propeller.

Member for

8 years 5 months

Posts: 13

The 2nd design has a double counter rotative fan in the annular duct. The turbofan jet engines on the outer frame provide forward thrust.

Member for

24 years 2 months

Posts: 755

There are two new lift fan designs. One is the Boeing Phantom Swift, which uses two internal lift fans and two wing tip ducted fans.Here is the picture:

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQJ1eti53Fdm0hl3boEoH_eV3D7Ia6O6-5wG1m0R7uF1Wyke49UbQ

Another one is an annular ducted lift fan VOTL aircraft, which uses one annular duct:

https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcTs6TIucq8R95gUU1gdaFYJM6DHshzBgAUQ-h4wbJdIcZ54AsEh

http://www.mdpi.com/2226-4310/2/4/555/htm

Which design is better?

Definitely the first one:

[ATTACH=CONFIG]242224[/ATTACH]

Attachments