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HomeAircraftHelicopterHelicopter Main Discussion › jet ranger head
03-12-2012 02:21 AM  6 years agoPost 1
helibeli

rrApprentice

wales.uk

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How do the mechanics set the blades at 180 degrees apart,what is the method?What is the function of the 2 weights on springs on top?

I'm suprised that nobody has duplicated that head for model helis(flybarless) it looks so simple.

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03-12-2012 02:28 AM  6 years agoPost 2
Mike Fortin

rrElite Veteran

USA

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I'd say that looks pretty darn close to what we have.

Have Rotors, Will Fly!

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03-12-2012 04:51 AM  6 years agoPost 3
JasonJ

rrKey Veteran

North Idaho

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The main reason you wouldn't want that head is because it is a teetering head. Go find the thread on mast bumping and you'll see why that wouldn't be good for aerobatic/3D rc helicopters. Now scale, that would be badass.

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03-12-2012 05:27 AM  6 years agoPost 4
jgunpilot

rrKey Veteran

Pollock, LA

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They set the blades 180 degrees apart by two methods, either using string or using mirrors. The springs let weights sling outward with RPM to allow greater flapping or teetering while in flight. As the rotor slows down, springs deploy stops so that the teetering isn't dangerous while on the ground.

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03-12-2012 05:51 AM  6 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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BELL 206 – PHI PILOT TRAINING MANUAL
JAN 2003
FOR TRAINING PURPOSES ONLY
11 -3
Two blade grip hub assemblies are fitted to the yoke.The blade grips are retained on the yoke by means of tension torsion straps. Changes in blade pitch angle are made by rotating the grips on the yoke journals.Each grip has two grease lubricated pitch change bearings.Pitch horns, mounted to the blade grips, receive pitch change inputs from the swashplate via two adjustable pitch change links. The blades are mounted in the hub assembly grips with through bolts which have hollow shanks for installation of weights to balance the hub. Blade alignment is accomplished by adjustment of blade latch bolts, which engage the root end of the blades. A flap restraint mechanism is installed on the main rotor hub to prevent excessive flapping of the main rotor during starting and shut down.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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03-12-2012 09:55 PM  6 years agoPost 6
helibeli

rrApprentice

wales.uk

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Thanks for the info.What is the theory behind allowing greater teetering/flapping in flight?

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03-12-2012 10:02 PM  6 years agoPost 7
jgunpilot

rrKey Veteran

Pollock, LA

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In a semi-rigid system, if the head teeters far enough to contact the mast (mast bumping) the rotor usually separates with catastrophic results. So, in flight the designer wanted the greatest possible teetering - which would be dangerous to passengers or ground crew around the helicopter with the rotor turning at flight idle. At flight idle the springs allow the weights to pull in the rotor is restricted from tipping down so far it would cut off someone's head.

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