0679

MAKE: SynchroLite ~ Rotor - Blade - Composite - VR-7b - Tip

Drawing:

Notes:

Weights

Atomic Weights: Uranium = 238.030, Lead 207.190, Tungsten = 183.850, Nickel = 58.710, Iron = 55.847, Aluminum = 26.982, Carbon = 12.011.

0.6315" diameter rod x 5.25" long 2 weighs =	0.4663 lbs in steel	1.1206 lbs in tungsten
(0.6315" half round x 5.25" long) / 2 weighs =	0.1166 lbs in steel	0.2801 lbs in tungsten
1.5" x 0.3318" x .75) x 1.9410" weighs =	0.2054 lbs in steel	0.4937 lbs in tungsten
Total	0.3220 lbs	0.7738 lbs

Idea: Do as Ultrasport does and put oversize leading edge weight in outboard 50%.

Tip weight:

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Rotor Blade Tip Weights... what good are they?

Mickey Nowell provided us with an excellent detailed answer to this, and in his brief summary he stated: " Tip Weights slow down the control response, dampen rotor speed variations, increase spin up time. Other than the increased spin up time the results are all good for models."

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Heli blades are symetric (neutral lifting) for a powered rotor. A heli blade, turning at high RPM tends to experience a "resonance" or vibration of the blade as it flexes, much as a plucked guitar string dokes if the natural resonance of the rotor blade falls into a range that could occur within the normal operating range of the engine. A tip weight reduces such flexing by increasing the tension on the blade and therefore raising its natural resonance frequency...

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Date: August 11, 1999 10:07 AM

Author: CA BEATY (cabeaty@worldnet.att.net)

Subject: Tip Weights

Tip weights Doug, increase the dampening provided by the rotor. Because a rotor with tip weights tends to "stay put" during turbulence, there is a stronger restoring force on the fuselage. This is of course at the expense of more "sluggish" control response.

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Last Revised: May 20, 2000