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Helicopter Discusssion
#91

Yes, what Kieran said. Also, ensure that with throttle at 1/2 stick (according to your curves..80% throttle & 50 pitch) that your actual pitch on the blades is 0. That's where your pitch gauge comes in.

Initially I'd tend to go for a linear throttle curve and your number 2 pitch setting around 42. this gives a gentle increase in pitch from your - 2 or 3' at 0 stick to 0' pitch at 50% stick, otherwise it might jump a bitfrom the 35 to the 50 that you have. Having a linear throttle curve (or one that's less steep) may make it a bit more docile without the head speed being too low.

As Kieran rightly said, you won't know fully until you fly it.

3 Useless things for a Pilot:
Air above you, Air in the tanks, Runway behind you.

EFLIGHT Blade 400, Inside a Jet Ranger Fuse
HK 500GT, Inside an EC-135 Fuse
ALIGN Trex 600
Durafly Spitfire
DX6i
Blade MCPx
Mavic  2 Pro
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#92

One thing that really surprised me at the instructors course is the RPM they were flying the training copters at. Nowhere near 80% throttle/1700rpm suggested by Align etc.

The things seemed like they were just barely ticking over and where really quiet. Trading the lower rpm for higher pitch seemed to make them nice and docile.

Seems counter-intuitive because you usually want those gyroscopic forces
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#93

Damn it..... This is just confusing the buggery out of meConfused

Now the swash plate goes down when i throttle up? Is that right?

I'm bringing this down on the weekend, along with a plane....

Dynam Pitts 12 EPO
Eflite Advance 25e
HK P-51D Mustang
3D Reaktor
Pitts Python S12 EP 54inch EPO
Kinetic 800

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#94

On a standard hk450 head the swash should lift up to increase collective
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#95

The only heli I know of that moves the swash DOWN for increased collective is the Blade 400.

Peter, go into your "Swash Mix" settings on your TX. Check the values of "Pitch". It will be either a + or a -. Whichever it is, it needs to be the opposite.

eg, if it's - 75....select it & make it +75. This will reverse the direction of the swash for you.

Hope that helps.

3 Useless things for a Pilot:
Air above you, Air in the tanks, Runway behind you.

EFLIGHT Blade 400, Inside a Jet Ranger Fuse
HK 500GT, Inside an EC-135 Fuse
ALIGN Trex 600
Durafly Spitfire
DX6i
Blade MCPx
Mavic  2 Pro
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#96

Gday Fellow Rotor Heads

I just has a minor mishap with the 500GT and stripped a little chunk out of the pinion that meshes with the main gear and powers the drive belt. Note to self, nose in hovering and landing is HARD. I landed with a bit of rear motion and the tail rotor did some brief lawn mowing. It appears that I am going to have to fundamentally pull the thing apart to be able to pop the replacement in. Is there an easy way to access that part to swap it over when the new one arrives?

Cheers
Rob B
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#97

No Rob

Tail strikes during landing with Helis with torque shafts will regularly strip those gears to.
Happens with the Trex 600.
The short answer is NO.
You have to strip the rear end of the heli to replace it.
When you order a spare get 3 or land nose heavy.

Gazz


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Don't ever let the fear of landing keep you from taking off!
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#98

Thanks gazz
Should I go the torque tube upgrade seeing as I will be gutting her?
Cheers
Rob b
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#99

Thats entirely up to you Rob.

There are pros and cons for both systems.

The torque shaft is less likely to fail during flight and will probably only fail after an impact.

The rubber band drives can handle an impact because they have inbuilt give, But they can also fail at any time particularly during flight.

If you can afford the expense I know what system I would use.

Gazz

Parkzone Stryker 27 Evolution
E flite Ultra Stick , T 28 Carbon Z
Skyartec Skyfun Scorpion,Skyfun 90 EDF
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Jet Teng L-39 HPAT Stumax 90
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FliteWork Extra 300 LPX 2.6M
Spectrum DX9i , DX6

Don't ever let the fear of landing keep you from taking off!
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(09-12-2010, 09:49 AM)brotherblonde Wrote:  The only heli I know of that moves the swash DOWN for increased collective is the Blade 400.

Peter, go into your "Swash Mix" settings on your TX. Check the values of "Pitch". It will be either a + or a -. Whichever it is, it needs to be the opposite.

eg, if it's - 75....select it & make it +75. This will reverse the direction of the swash for you.

Hope that helps.

Gday Andrew

FYI the Twister Storm 3D that I got off Gazz also has a downward moving swash for pitch up.

Cheers
Rob B
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Just got back from the field, gave my Trex 600 Airwolf its maiden flight.
Very very happy with the first flight,trim was almost spot on and only have to give 2 clicks of aileron right to get it into a beautiful neutral hover.
See pics in Maiden flight reports post.
Yeeeehaaaaa!!!!!!!

Gazz

Parkzone Stryker 27 Evolution
E flite Ultra Stick , T 28 Carbon Z
Skyartec Skyfun Scorpion,Skyfun 90 EDF
Hobbyking Voltigeur, Funfighter T28, Mirage 2000, Minimoa 2.4m Glider
Jet Teng L-39 HPAT Stumax 90
Pheonix Tiger 50
FliteWork Extra 300 LPX 2.6M
Spectrum DX9i , DX6

Don't ever let the fear of landing keep you from taking off!
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Exclamation 

For those of us that have (or might be considering) the Align 3G flybarless control system for helicopters, there is an important modification that has been developed in the field to overcome bobbing of the tail boom during fast forward flight (FFF). It involves dismantling the 3-axis gyro sensor and using electronic grade silicon to eliminate vibrations from reaching the sensitive SMMD sensors. Apart from the modification itself, it is also important to mount the 3G sensor away from vibrations - the tail rotor gearbox mount being the most vibration prone position.

Please visit: http://www.helifreak.com/showthread.php?t=249378 for full information and independent feedback.

I have done this modification myself. It is simple and very effective.


Dave
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After a few bearing and shaft replacements on the current motor, its time for a new motor.. 1600W in a motor the size of a golf ball!! Gotta watch my ESC (60A) and the batteries now. It can pump out 2300W if called on. Might have to tame down the pitch settings to keep the current spikes under limits so I don't go "supernova" mid-air. Fun, fun, fun. Thumbup

Next investment will have to be a 75A or 100A Castle Creations Phoenix ICE ESC and higher "C" rated batteries. The viscous circle!

http://www.align.com.tw/shop/product_inf...Path=22_67&products_id=3639

Specification:
●Input voltageBiggrinC11.1V-25.2V 3-6cell Li-Po
●Max continuous current:75A/110A(5sec)
●Max output power:1600W/2300W(5sec)
●KV value:1600KV
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For all you Trex 600 owners this is how your heli flys in the hands of an expert. I personally like this flying style as there are many moves with perfectly timed transitions. Not at all like the "angry mozzie" style that many younger 3D heli pilots follow where they constantly "just miss" the ground (called "smackdown").

http://www.youtube.com/watch?v=XPB19tIQSUo&playnext=1&list=PL397A7958FF59A55F
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Hot off the press. The new Logo XXtreme is coming (no, I am not going to get one). It is probably the biggest RC heli someone can buy.

This heli is "800" size to put things in to perspective. There is a shot in video where Kyle Dahl (the pilot) puts the new Logo 'extreme' next to his Logo 600. It is one big heli (I'd hate to pay for the batteries it feeds on).

http://vimeo.com/22929247?ab


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800 size!! Man that's HUGE, considering a 700 is the same as a 90 nitro machine! That would fit a BIG turbine too. Smile

3 Useless things for a Pilot:
Air above you, Air in the tanks, Runway behind you.

EFLIGHT Blade 400, Inside a Jet Ranger Fuse
HK 500GT, Inside an EC-135 Fuse
ALIGN Trex 600
Durafly Spitfire
DX6i
Blade MCPx
Mavic  2 Pro
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Niiice, I'll take 3 Wink
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At about the 40-second mark, Mr Dahl says that it's "big, beefy and indestructable". Hmm - reckon there'd be a few of us at PRCAC who would be able to severely test that last assertion Wink

Steve Murray
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(04-05-2011, 04:38 PM)yarrumevets Wrote:  At about the 40-second mark, Mr Dahl says that it's "big, beefy and indestructable". Hmm - reckon there'd be a few of us at PRCAC who would be able to severely test that last assertion Wink

Definitely destroyable.
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Gday Fellow Heli Heads

Have you guys seen the bad arse looking heli drone that the US stacked whilst getting Bin Laden?
Now THAT'S an rc model from hell, probably got Mikado written on the side of it somewhere? Presuming this is the Mikado Logo "If you can see me your Fu#$ed" version for those who are bored with the XXtreme's capabilities.
Awesome stuff!

Cheers
Rob B
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It wasn't a A160T Hummingbird. Forum I'm on reckons it was a blackhawk with stealth bodykit. Tail is very different though
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Gday KV

Blackhawk? You're joking right? From the scale of the wall it is leaning against + the people standing around it I would say that it is not more than 4 or 5m long, has very short high rpm main rotor blades and is a unmanned drone of some description. Looking at the design and the size I speculate that this puppy is small enough to be spun up and launched off the ramp of a Combat Talon C130 and is controlled remotely. Looking again at the main rotor design I would hypothesize that it does not have a high degree of hover capability hence the "wings" and also large horizontal stabilisers around the tail area. That theory would also tie in with the very early reports that stated it crashed because it "stalled".
To be honest I feel quite "blessed" that I have been able to see a very specialised and highly unique machine that has never been seen before. I am sure that this design was not intended to be seen by joe public. Interestingly the very first photos of this that came out had the aircraft largely concealed by a temp fence made of cloth or something, all you could see was the top of the tail.

Stay tuned on this one.

Cheers
Rob B
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But why would a Drone need to land? Presumably they'd be using them for oversight and stand off fire support?

I think the reports of stalling are mis-interpretations of getting caught in a vortex ring, could easily happen with all those walls.

I haven't done it myself but 2 forums I read have compared the scorch marks to the size of a Blackhawk.

Then there is this recently released pic, what ever it was, it wasn't THAT small. Very stubby blades though!
   

This is cool stuff.

http://www.secretprojects.co.uk/forum/in...9e70f4db19&topic=12597.0;all

http://www.militaryphotos.net/forums/sho...aid/page24
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A concept mockup:
   

I want to believe!!!! Wink
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Aaaand a good summary if you don't want to trawl through pages of forum posts:
http://www.wired.com/dangerroom/2011/05/...pter/all/1
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Gday KV

I am too seeing a lot of Blackhawk interpretations however it makes no sense. In the picture you posted there is a guy with his hand on one of the stubby little wings. A Blackhawks dimensions state a length of 64ft 8inches, as per the scale of the picture the guy looks a bit under half the size of the length of the heli which would make him about 30 feet tall?
Rotor diameter is also stated as 53 feet, these blades look like they are about 6 to 7 foot long max.

Good call on the vortex ring state....

With a very small high rpm rotor vortex ring state could be quite likely if the heli was allowed to enter a high rate of descent. My previous post stating that this heli would probably not have a great hover performance (if any) could indicate that it was allowed to get below translational speed thus descended and entered it own downwash inducing the vortex ring, or as the media reported "stalled". The presence of the walls would have no influence on the induction of a vortex ring. I am pretty sure it was never intended to land on this mission. Not that you could call it's position as "landed". Hope to catch up with you at the field and discuss this further, as stated earlier this is a rare and cool as opportunity to see the absolute cutting edge of military aviation.

Cheers
Rob B
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(06-05-2011, 01:06 PM)robair Wrote:  In the picture you posted there is a guy with his hand on one of the stubby little wings.

Rotor diameter is also stated as 53 feet, these blades look like they are about 6 to 7 foot long max.

Picture believed to show part of the tail-plane and tail-rotor assembly only, not the entire craft.

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Gday Claudius

Now that make a bit more sense, will re-scale using that philosophy, still feel the overall geometry does not support that.

Cheers
Rob B
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Yeah the remaining wreckage is the tail rotor, I reckon the heli came down across the wall and sheared the tail off. Since they didn't leave the compound on foot, could never torch the tail.

More fuel for the fire
[Image: nessie.jpg]
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Gday KV

I stand corrected.
You wanted "to believe". Now it seems you can.
Good Stuff.

Cheers
Rob B
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