Teeter Stops

[Udi]

Is there a "standard" for teetering limits? I guess a standard would be measured in degrees???

Thanks

Udi

[Aussie_Paul]

Udi, Bensen used a total of 18 degrees measured from one teeter stop to the other. This is required for hand starting. If you have a pre rotator you don't need a lot. I usually use around 16 degrees total, but I have been as low as 12 degrees. If you can find Chuck Beatys rotor performance spread sheet it will tell you approx the amount of teeter at certain speeds.

The smaller the amount of teeter the harder it is to stop the blades in a heavy wind

Can anyone help with that program for us?

Aussie Paul.

[Aussie_Paul]

Always have some "softer" material for the hub bar to stop at, rather than alloy to alloy. No chance of a stress riser then. It just goes to show you how tough the hub bars are. All those marks that end up on the hub bar from tying the rotors against the teeter stop, and I din't think that there has ever been a failure due to that.

Aussie Paul.

[Udi]

Paul,

Chuck's HP3 spreadsheet indicated 4.5 deg flapping angle at 100 mph for my setup. 9 degrees does seem excessive.

How do you suggest to install a "soft" stop on top of my Air Command teeter stop plate?

Udi-

[Udi]

Steven - where do you get a quarter inch thick delrin plate?

Thanks

Udi

[rehler]

It is helpful to be able to bring the blades to level, so if the rotor head is 9 degrees tilted back in normal cruise flight along with the mast, then 9 degrees forward would be needed to bring the blades level. And 18 degrees from level (9 degrees back) is often good for spinning up the blades while on the ground. So, the "standard" 18 degrees (9 forward and 9 back) is good both in flight and on the ground.

18 degrees is well proven, so why change it.

[Udi]

Ken - the question was not about cyclic range, it was about teetering range... Both happen to be +-9 degrees in the Bensen standard.

Udi-

[KenSandyEggo]

Wait....I'l answer for "Texas Ken"..........."Never mind."

[Aussie_Paul]

Ken R. the Raf problem of the prop able to hit the rotors is a major reason to change it on a Raf. I agree though, 9X9X9X9 for teeter and control movement works well.

Aussie Paul.