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YODI
02-02-2003, 10:49
Hi guys,

Im big in the RC model scene, own a couple of cars and a couple of planes.

Recently I got my hands on the Simulator which is apparently the best and have been practising my flying skills and just for a laugh I have been using choppers with no luck but my mate whos an expert can fly upside down.

So Question is, can a REAL helicopter hover upside down??

Cheers, Yodi
Ian D
02-02-2003, 10:57
don't think they can hover upside down, but can do loops and stuff.

so can RC heli's HOVER upside down? i thought the blades would be pushing air the wrong way for it to hover?
YODI
02-02-2003, 11:01
RC choppers can deffo fly upside down, seen it with my own eyes in real life, on the simulator and on Sky digital a programme called remote madness.

Cheers, Yod
Doug
02-02-2003, 11:02
a helicopter CANNOT hover upside down... if you think about it the blades would have to spin the other way to produce lift, even if it could get upside down.. it aint gonna happen basically :P

some can do loops and rolls, but those are only the small manoeuverable ones, like our own Navys Lynx..
YODI
02-02-2003, 11:04
Is that definate that they cant then?

Also I assume your only talking about real choppers.

Do you own a chopper then?

Yodi
Chris
02-02-2003, 11:05
Originally posted by Doug_200SX
a helicopter CANNOT hover upside down... if you think about it the blades would have to spin the other way to produce lift, even if it could get upside down.. it aint gonna happen basically :P

some can do loops and rolls, but those are only the small manoeuverable ones, like our own Navys Lynx..

cant adjust the trim of the blades then can you :p
Doug
02-02-2003, 11:07
you can adjust trim, but they cant pitch the blades down enough to generate the required lift to keep it in a hover if it were upside down
Chris
02-02-2003, 11:12
Originally posted by Doug_200SX
you can adjust trim, but they cant pitch the blades down enough to generate the required lift to keep it in a hover if it were upside down

ever heard of modification ????

CANNOT is a dangerous word
Doug
02-02-2003, 11:14
modification ??

i thought we were talking about REAL helicopters not RC ones here ??

i challenge you to name one chopper that can hover upside down, be it civvy or military ;)
Chris
02-02-2003, 11:23
easy sfuff --------------- flymo !

seriously tho theoretically it is possible but only if you find someone skillled enough to mod the chopper and somebody stupid enough to try it :D
Chimp
02-02-2003, 11:24
surely if you adjust the blades to enable upside down hovering, it wouldnt be able to lift off in the first place :D
Doug
02-02-2003, 11:30
i disagree Chris.. i dont think its possible... although the concept of pitching the blades to produce lift in the opposite direction is valid, you have to take into account the massive instability of the aircraft once it is upside down.. it would be like balancing a cricket ball on a needle and expecting it to stay there..
YODI
02-02-2003, 11:32
So my conclusion is that its not possibly without some serious mods but even thats not guaranted.

Wheres as an RC Chopper can fly upside down in standard form?

Yodi
Doug
02-02-2003, 11:38
Well Chris and I have different views about whether it would work or not, i certainly wouldnt want to be in the thing when someone tried it that for sure.:rolleyes: :eek: :o

i can only assume the only way an RC chopper can do it is down to its lack of weight

its like the Cessna vs 747.. try and do a loop in a jumbo and youre dead, where as you can pull them off easily in a Cessna, innit :D
Jezz_S13
02-02-2003, 12:47
You'd have eto swtich the pitch from positive to negative very fast to do it.

4 Kg of model it's quite easy, 4 ton of proper chopper bit scarier i imagine.

I used to be well into planes, but kinda grew out of it, went to college now can't be arsed. Car instead now.
Actual_Ben_Taylor
02-02-2003, 13:24
Ask Richie, he fixes helicopters for a living...
amcluesent
02-02-2003, 14:23
>So Question is, can a REAL helicopter hover upside down<

They have them in Australia, so I suppose the answer must be yes...
Alan
02-02-2003, 14:49
These guys seem to know some answers

http://www.rcuniverse.com/rcarchive/23/2002/06/1/31540
vega
02-02-2003, 17:17
Originally posted by amcluesent
They have them in Australia, so I suppose the answer must be yes...

.............boom boom..............
YODI
03-02-2003, 01:58
basically the answer is No then, but its been done before.

Thanks for that link, a very helpfull site, shame there in the US.

Cheers, Yodi