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Rotor Blades R/C Helicopter Rotor Blade Discussions


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Old 09-06-2017, 06:06 AM   #1 (permalink)
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Default Main blades overlap tail blades

I have by mistake 600mm blades that is overlapping the tail blades by nerly half (30-40%). Will this be ok or will it effect the flying performance of the heli?
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Old 09-06-2017, 06:19 AM   #2 (permalink)
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There's a good tip in the latest RotorHeads. Take a picture from the side, and draw arcs around the blade paths to find the interference.

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Old 09-06-2017, 06:28 AM   #3 (permalink)
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Originally Posted by richardv View Post
There's a good tip in the latest RotorHeads. Take a picture from the side, and draw arcs around the blade paths to find the interference.
Or simply rotate the head until the main and tail grips are at their closest position. Now measure the diagonal distance between the centre of the main and tail blade grip bolts.

This dimension is the maximum combined length of main and tail blades (allow 5mm for clearance). If the blades are any longer there is risk that they will clip each other.
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Old 09-06-2017, 08:55 AM   #4 (permalink)
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Not fully understand, you say centre of the main blades, that should be the middle of the main shaft?. So from the main shaft middle to the tail blade bolt? Or am I lost here ?
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Old 09-06-2017, 11:12 AM   #5 (permalink)
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The important thing is that the tips of the main blades can't touch the tail blades when the mains are flexing down ( as they do sometimes). So it's important that the distance between the grip pivot bolts is greater than the combined blade length, as I described.
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Old 09-06-2017, 11:18 AM   #6 (permalink)
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Originally Posted by Grumpy_Old_Man View Post
Or simply rotate the head until the main and tail grips are at their closest position. Now measure the diagonal distance between the centre of the main and tail blade grip bolts.

This dimension is the maximum combined length of main and tail blades (allow 5mm for clearance). If the blades are any longer there is risk that they will clip each other.
That's too generalized, as the main blade bolts mostly aren't the point about which the blade pivots.

For a dampened head with rigid grips and blades, use the hub center as your pivot.

The stiffer the dampeners and the softer the blades, the farther out move that pivot from center. For a completely rigid rotor, use the point of the blade where the root section ends and transitions into a constant thickness spar.
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Old 09-07-2017, 01:04 AM   #7 (permalink)
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That's too generalized, as the main blade bolts mostly aren't the point about which the blade pivots.

For a dampened head with rigid grips and blades, use the hub center as your pivot.
The way i suggested works fine. Even a soft damped head only moves a few degrees which doesnt make a significant difference to the measurement, the 5mm clearance I suggested more than looks after it.

But if you prefer to make it very complicated feel free!
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Old 09-25-2017, 12:55 AM   #8 (permalink)
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Don't risk it, the damage if something happens will be much more than if you just sell them and get the right blades.
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