DescentBB

That guy must be a D3 pilot *click* (14MB, WMV)

Sorry if this is a double post..

that dude has sick skillz. No doubt about that.

Old, but good. I'm pretty sure he's using gyroscopes to help him out (look what he does in the beginning of the video. My guess is he spins the helicopter around several times to get them going).

Na man, that's Ace in his life flight bird.

heh I was gonna make an Ace joke/comment but I figured someone else would later in the thread... I was right

That was cool!

Sweet!! One wouldnt think you could fly a pyro like that, let alone a RC copter

It sort of looks like a dragonfly flying, until you realize dragonflies can't fly nearly that good. I don't even want to think about how much money he's spent on crashed choppers

Dedman wrote:Na man, that's Ace in his life flight bird.

screw you too....


HOLY SHIZ!!! that was friggin sweet. and i thought cutting someone's small front yard with a R/C Helo was impressive.


thats one thing i wish real helo's could do.......fly sustained inverted flight. that was a bada$$ auto-rotation landing he did too.

AceCombat wrote:

Dedman wrote:Na man, that's Ace in his life flight bird.

screw you too....

Sorry Ace, couldn't resist.

Thing is, I wonder how many heli's he went through to get this good?

Alan Jr. (the pilot) might make the 2005 FAI F3C USA team. He's that good.

There is a gyro being used. But, only to stabilize the yaw movement (tail).

Crash costs are nominal unless you really f'up. I've crashed 3 times in the past 3 years and total cost to repair is less than $100 US combined (flying every weekend). Total cost to buy a new, average 90-size heli is between $2000 and $3000 US (plus transmitter, insurance, pit gear, etc.).

Alan is lucky; he gets all his s#it for free since he is fully sponsored by Thunder Tiger and Airtronics. Although I'm sure he (meaning Alan Sr., his dad) spent a lot before Jr. became a factory pilot.

There are several Descent players I know of who also fly helis. Anyone with about $1000 US to burn (typical trainer cost) really aught to give it a try. Tip of The Day: A simulator really does wonders to your skill level.

More heli videos: http://www.augustoheli.com/

My favorite heli forum: http://runryder.com/

has this been posted before?

i ask coz i don't wanna (56k) download it again if i already have it. but otherwise i'll grab it coz this kinda icy hot heli stunta rocks!

Unreal ...

ok g8, now explain to me how a gyro would reverse the flight dynamics of a heli? I'm sorry but the lift is generated by a lower air pressure above the craft if I'm not mistaken...


How the hell did this guy flip the chopper upside down without burrying the rotor into the ground? (reversable rotor turn, sure, but that kind of setup would cost waaaay too much... not to mention it would be extremely slow, ie: LAG!!!)
"just for fun" as the video title implies doesn't seem to fit.

Simple...

The blades are usually in this position : /

In inverted flight, the blades are turned, so they are in this position :
Hence, when the chopper goes upside down, it still has lift in the correct direction.

Basically they just flip the blades as soon as the chopper goes upside down.


....well, i think that's the case anyway, i'm just assuming based on my own reasoning, heheh.

yep.

the choppers in this scale model flight sim "FMS" can do it too, the engine keeps spinning the same way, and the BLADES themselves tilt the other way, reversing the airflow.

i'm unco though, i keep crashing (it's hard!!)

(ps: can someone PLEASE tell me if this video has been posted here before, so i don't doubleup my downloads)

Yes, it has been posted before cause I remember it.

No idea roid.
Yeah, don't quote me on this, but I believe most R/C heli's run at a constant RPM pretty much the whole flight. Vertigo was talking about rotor pitch. If you study fluids, you will see that it isn't just the air foil shape that creates lift, it is a airfoil at a certain angle with the airflow. As you tilt the leading edge up in the airflow, the wing produces buko lift as compared to being straight or tilted down. Most airplane props and all helicopter rotors have that. Actually, helicopters are quite complex- the way they control going forward, backward, side to side, up and down is all with pitch. Each blade will change pitch as it goes around in a circle, such that they all produce the most pitch when they are in a certain spot (I.E. the back) and the least opposite, thus tending to tip the heli. (I guess most of you know all about this stuff)

Gammaray wrote:ok g8, now explain to me how a gyro would reverse the flight dynamics of a heli? I'm sorry but the lift is generated by a lower air pressure above the craft if I'm not mistaken...


How the hell did this guy flip the chopper upside down without burrying the rotor into the ground?

Vertigo wrote:Simple...

The blades are usually in this position : /

In inverted flight, the blades are turned, so they are in this position : \

Hence, when the chopper goes upside down, it still has lift in the correct direction.

Basically they just flip the blades as soon as the chopper goes upside down.

Vertigo, answered it as pure as it can be with a slight error. a R/C Helo because of its very light weight and the rotor's extreme RPM (unlike a real helo which has a much slower Rotor RPM) the neutral position of the rotor blades is infact negative in relation to normal lift operation. the blades generate lift even if they are in a "--" state. this is simply because rotor blades are basically aircraft wings, this combined with the much higher RPM's and factor in the light weight......it would take off without any input from the transmitter....just spin up the engine...VROOOOOOOMM!! up she goes. to counter this, a R/C Helo's main rotor blade neutral pitch, for a Counter-Rotating direction looking at the nose of the helo the blade is travelling --> the pitch would be \ in relation to -- "Zero Pitch". a real helo this is not needed simply because the helo itself weighs enough to keep itself on the ground and the rotors at neutral pitch do not produce enough lift alone to sustain flight.

snoopy wrote:Actually, helicopters are quite complex- the way they control going forward, backward, side to side, up and down is all with pitch. Each blade will change pitch as it goes around in a circle, such that they all produce the most pitch when they are in a certain spot (I.E. the back) and the least opposite, thus tending to tip the heli. (I guess most of you know all about this stuff)

i never knew that. i always just thought the pivot rotated across 2 axis. vectored thrust if you will.

roid wrote:

snoopy wrote:Actually, helicopters are quite complex- the way they control going forward, backward, side to side, up and down is all with pitch. Each blade will change pitch as it goes around in a circle, such that they all produce the most pitch when they are in a certain spot (I.E. the back) and the least opposite, thus tending to tip the heli. (I guess most of you know all about this stuff)

i never knew that. i always just thought the pivot rotated across 2 axis. vectored thrust if you will.

the device that controls this pitching is called the "Swash PLate"

The video was made around February of 2004. I don't know if it's been posted here before.

Gammaray wrote:ok g8, now explain to me how a gyro would reverse the flight dynamics of a heli? I'm sorry but the lift is generated by a lower air pressure above the craft if I'm not mistaken...

Eh? There's a gyro on the tail, that's it. Scale birds with 3 or more blades (i.e. without the bell-hiller affect we have with flybars and paddles) sometimes do have 2 gyros to stabilize the cyclic.

Gammaray wrote:How the hell did this guy flip the chopper upside down without burrying the rotor into the ground? (reversable rotor turn, sure, but that kind of setup would cost waaaay too much... not to mention it would be extremely slow, ie: LAG!!!)
"just for fun" as the video title implies doesn't seem to fit.

Most setups, including mine, can go from full positive pitch (about 10 deg.) to full negative pitch (about -10 deg.) in about 1/10th of a second. Is that slow to you?

As far as cost... it does not cost any more to go from 0/10 deg. to -10/10 deg. pitch.

The title "just for fun" is just... as long as you don't crash.

snoopy wrote:No idea roid.
Yeah, don't quote me on this, but I believe most R/C heli's run at a constant RPM pretty much the whole flight.

You are correct. RPMs range from 1200 for scale birds to 2200 for smaller, hi-performance birds. I normally run 1800 rpm. And for reference, full-scale runs from 400 to 600 rpm (to the best of my knowledge).

snoopy wrote:... helicopters are quite complex- the way they control going forward, backward, side to side, up and down is all with pitch. Each blade will change pitch as it goes around in a circle, such that they all produce the most pitch when they are in a certain spot (I.E. the back) and the least opposite, thus tending to tip the heli. (I guess most of you know all about this stuff)

Adding pitch at the back will not cause an r/c heli to tip forward. Instead, it will cause the heli to tilt left. That's why we change the phase of the inputs so that they are about 90 degrees ahead of where we want the heli to go. (That's just a technical thing since it is setup so that you still give forward stick to tilt forward.) Most of you know all this stuff.

AceCombat wrote:Vertigo, answered it as pure as it can be with a slight error. a R/C Helo because of its very light weight and the rotor's extreme RPM (unlike a real helo which has a much slower Rotor RPM) the neutral position of the rotor blades is infact negative in relation to normal lift operation. the blades generate lift even if they are in a "--" state. this is simply because rotor blades are basically aircraft wings, this combined with the much higher RPM's and factor in the light weight......it would take off without any input from the transmitter....just spin up the engine...VROOOOOOOMM!! up she goes. to counter this, a R/C Helo's main rotor blade neutral pitch, for a Counter-Rotating direction looking at the nose of the helo the blade is travelling --> the pitch would be \ in relation to -- "Zero Pitch". a real helo this is not needed simply because the helo itself weighs enough to keep itself on the ground and the rotors at neutral pitch do not produce enough lift alone to sustain flight.

Huh? Does this also apply to the symmetrical airfoils? No r/c heli uses asymmetrical blades unless the bird needs the extra lift (and won't be going inverted).

And quit calling full-scale helicopters "real". That's implying what I fly isn't "real". When one slams into the ground or catches fire, it sure looks real to me.

[MS]Instig8 wrote:

AceCombat wrote:And quit calling full-scale helicopters "real". That's implying what I fly isn't "real". When one slams into the ground or catches fire, it sure looks real to me.

ill call them what i want to.

No dead people = not real.

Wow. I swear that guy did barrel rolls with that thing!

Heh,
The $$ needed to replace a crashed r/c helo is real enough

snoopy wrote:No dead people = not real.

That's sad. There are plenty of people who get killed by r/c stuff. Most recent, Ron Kyle in Houston Texas died of trauma due to a helicopter incident. He was training a new pilot when the new guy lost control and the blades ended up attacking Ron's neck.

Real == real. r/c == real. full-scale == real. Fake == ???? (maybe a simulator)

[MS]Instig8 wrote:Fake == ???? (maybe a simulator)

Yep and that's the type AceCombat uses ...since if you notice he knows nothing of flight physics!