Nemeth Designs Sikorski CH-54 Skycrane released

[michael davies]

Colin, thanks for a great looking model! Bought it yesterday and flew it a bit on my laptop and noticed it kept tilting to the right, normal or am I doing something wrong? Admittedly using the mouse, which sucks, but not at home so can't enjoy completely.

Matt

This is normal in helicopters, the Skycrane rotor rotates counter clockwise from below which will induce torque yaw to the left and a roll to the right, the Seaking rotates the other way and will torque yaw to the right and naturally roll to the left, its about 3 degress, Seakings always land left wheel first, I suspect the Skycrane will always land right wheel first. The roll right is a good sign that some one spent some time on the FDE, naturally those who usually fly fixed wing will find this trait pretty annoying to begin with , but it is correct. On the Mil-24 Hind they tilted the whole rotor mast so that the fuselage is actually level in flight but the rotor mast and disc is tilted to overcome this natural roll trait, as far as I know Sikorsky only tilt the mast in the longitudal direction (usually 5 degrees) not the lateral as well like Mil.

Hope that helps

Michael

 

[Roadburner440]

Can only speak for the H-60, but on all ours the main rotor is tilted 5 degrees forward giving it a sloped appearance when the disc is spinning. The tail rotor is also canted 20 degress to provide a small amount of lift to try and keep the tail up during hovers cause it has a tendancy to nose up during a hover. That is interesting that the Russians thought to do that though. It is usually good habit though to set one wheel down in fully articulated rotor aircraft so in case you experience ground resonance you can quickly get the weight back off the wheels before it destroys the aircraft. Also I would love to see someone take a steel pole to a rotor system. Rotor blades are pretty resilient and resist a lot of damage. One of the HS squadrons here actually had 2 H-60 collide rotors in flight and both landed safely. I think more damage would come from it whacking the pole out of someones hand and it slamming into the airframe than actual damage to the blade itself.

 

[michael davies]

Steve, correct, like the Seaking the H-60 has a tilted main rotor longitudually, much of that I ma told is to present a rotor disc that has some forward lift componet as welll as the vertical lift component, the upshot of a tilted mast longitudually is that the fuselage is reasonably level at cruise. A good way to check to see if N-60s or Seakings are pushing on is the fuselage atitude, if they are nose down then they are generally in a hurry. The down side is that they tend to hover tail heavy, the Seaking is most certainly tail heavy as unlike the H-60 does not have the canted tail rotor to generate lift. Conversely the CH-53 flies nose up, even though the main rotor is tilted 7 degrees forward, one if not the only helo to actually ptich up the faster it goes, consequently the Stallion tail hangs very low in the hover, it also slows down pretty quick too from forward flight.

Kindest

Michael

 

[flewpastu]

Nemeth just released service pack 1.01 at thier website, fixes some of the problems people were complaining about.

http://nemethdesigns.com/

Bill

 

[Cag40Navy]

When you fly the S-64E for the first time, you can really feel the natural tilt of the aircraft. After a few flights i got used to it. But for some reason you can feel it more in Erickson's than in Evergreens.

I tried the pole idea, worked. Should have seen the look on his face!

 

[10lrrp]

Patch 1.1 out at Nemeth's website.

 

[XLR8]

After flying this helo around for a couple of days now I can say its a nice chopper . But I have a question ? Is it normal for the sky crane to pitch forward and constantly have a forward movement .It make hovering difficult . Is there a auto hover/trim function that helps . Thanks