Rules question...

puddingwrestler · January 22, 2009, 10:04:33 PM

I assume that entries into this GB must have rotors. I ask because I want to know if I can make something like the police gunships from G-Police.

It's helicopter shaped, behaves a lot like one, but is driven by gimbaled thruster pods. I was thinking about building something like that outof a Eurocopter Tiger (cause I have one!)

puddingwrestler · January 24, 2009, 08:57:11 PM

Anyone? Anyone? Bueller?

Weaver · January 27, 2009, 04:50:34 AM

Well it's not my decision, but I would guess not: it's more of a vectored thrust vehicle than a helicopter/autogyro/gyroplane type craft, as far as I can tell.....

As a rough suggestion, I would venture that a rotary-winged aircraft is one where the overwhelming majority of the air which lifts the craft is NOT heated by having fuel burnt in it. Thus a tilting ducted fan is as eligible as a conventional helicopter, but a tilting turbojet or turbofan isn't. Of course, this opens the question of tilt-rotors/tilt-fans whose engines are co-located with them (such as the V-22) whose exhausts point downwards when hovering. The solution here is one of proportion: in the V-22, the vast majority of the engine's power is absorbed by the rotor, and the exhaust contributes only a tiny percentage of thrust. With a tilting turbofan, on the other hand, a significant proportion of the thrust comes from the core.

Again, just my thoughts and not my decision......

anthonyp · January 27, 2009, 06:53:11 AM

Been meaning to address this, just keep forgetting.

Yeah, Weaver pretty much hit it on the head. Put blades on it, and it's acceptable (heck, even folding blades for once it's airborne), but in it's current form, it's not eligible.

jcf · January 27, 2009, 01:03:34 PM

So tilt-duct machines like the DOAK 16, X-22 and Nord 500 would be eligible?
http://prototypes.free.fr/vtol/vtol-7.htm

DOAK 16

Nord 500

Jon

puddingwrestler · January 27, 2009, 01:25:49 PM

Fair enough, that's basically what I was expecting. Just thought I'd throw it out there and see.
Now to think of something else to do...

Mossie · January 27, 2009, 01:46:06 PM

Don't let that stop you building it, Pudding! The G-Police games are a good source of inspiration, the Havoc & Venom gunships being particularly do-able.

anthonyp · January 27, 2009, 07:57:32 PM

Yeah, if you could mod them into ducted fans, that'd work too!

Yeah, Jon, ducted fans are welcome in this one! They got props that some sane person put guards around

nev · February 04, 2009, 10:09:07 AM

Quote from: anthonyp on January 27, 2009, 06:53:11 AM
Been meaning to address this, just keep forgetting.

Yeah, Weaver pretty much hit it on the head. Put blades on it, and it's acceptable (heck, even folding blades for once it's airborne), but in it's current form, it's not eligible.

So, uh, does that mean the V-22 is eligable or not? :confused:

Edit: nevermind, Antonys 1st post in the main thread says they are in!

Weaver · February 05, 2009, 10:00:05 AM

Quote from: nev on February 04, 2009, 10:09:07 AM
Quote from: anthonyp on January 27, 2009, 06:53:11 AM
Been meaning to address this, just keep forgetting.

Yeah, Weaver pretty much hit it on the head. Put blades on it, and it's acceptable (heck, even folding blades for once it's airborne), but in it's current form, it's not eligible.

So, uh, does that mean the V-22 is eligable or not? :confused:

Edit: nevermind, Antonys 1st post in the main thread says they are in!

V-22 is in because the thrust from the exhausts when hovering is a negligible part of the total thrust.