Interesting concept in the new Nano main blades..... - HeliFreak
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nano CP X Blade nano CP X Helicopters Information and Help


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Old 12-07-2012, 03:19 PM   #1 (permalink)
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Cool Interesting concept in the new Nano main blades.....

I got my new green main blades for Lynx today. They seem like well constructed blades. Flat out of the package and the color is vivid. First thing I noticed is that the root is just a bit large and binds up with the nut side of the feathering shaft. Nothing a bit of sandpaper didn't resolve. The thing that really stuck out is that the blades are not smooth. The have parallel ridges molded into them down the entire lenght of each blade. Never seen that before.

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I'll have to wait until tomorrow to give them a spin. I'm curious to see how they fly.
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Old 12-07-2012, 03:28 PM   #2 (permalink)
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Interesting... Thanks for sharing it!


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Old 12-07-2012, 03:30 PM   #3 (permalink)
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I guess you can comb your hair with that after a windy day at the flying field
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Old 12-07-2012, 03:55 PM   #4 (permalink)
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Quote:
Originally Posted by timox72 View Post
I guess you can comb your hair with that after a windy day at the flying field
If I had hair to comb!
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Old 12-07-2012, 04:03 PM   #5 (permalink)
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I bet those will sound interesting!
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Old 12-07-2012, 06:43 PM   #6 (permalink)
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Has anyone from Linx said why this was done? I wonder if it was for better performance or for noise reduction.
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Old 12-07-2012, 07:02 PM   #7 (permalink)
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MSRX blades have a ridge on them.
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Old 12-07-2012, 07:28 PM   #8 (permalink)
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Reminds me of a school ruler, they prob have a very good reason
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Old 12-07-2012, 08:04 PM   #9 (permalink)
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Just a guess, but I bet the ridges break up the air on the blade and create a sheet of smooth air that surrounds the blade.
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Old 12-07-2012, 09:39 PM   #10 (permalink)
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Quote:
Originally Posted by asodestrom View Post
MSRX blades have a ridge on them.
Look closer at the nano blades, teeny tiny ridges.
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Old 12-08-2012, 02:11 AM   #11 (permalink)
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looks like a wing profile. that should create lift just like a wing does. i think it speeds up the air going over the top of it creating the lift.
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Old 12-08-2012, 03:08 AM   #12 (permalink)
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Quote:
Originally Posted by boofy View Post
looks like a wing profile. that should create lift just like a wing does. i think it speeds up the air going over the top of it creating the lift.
^^^Bernoulli Effect
Common, but doesnt explain the ridges
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Old 12-08-2012, 03:13 AM   #13 (permalink)
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The ridges are most likely added for boundary layer control especially when the blades active higher angles of attack where laminar separation is prevalent. This will keep the air attached to the blade much longer and reduce the onset of suction drag and airflow separation while increasing lift over a larger range of AOA for a constant head speed. The concept is similar to the use of dimples on golf ball which achieves the same thing thus, reducing the "Magnus Effect".
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Old 12-08-2012, 03:53 AM   #14 (permalink)
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Old 12-08-2012, 06:18 AM   #15 (permalink)
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The ridges are there for same reason a golf ball has dimples. Laminar airflow.

By trapping a boundary layer of air against the blade it creates a foil shape in effect even though the blade is actually flat. It also allows the blade to glide through the air like its made out of air. Creating the foil shape with a tiny ridge instead of using twice as much material is pretty clever. A layer of air is always going to be lighter than adding a layer of plastic to achieve the shape of a foil.

That ridge creates a foil shape out of layers of air pressure, in short.

I got this from wiki:
For example, consider the flow of air over an aircraft wing. The boundary layer is a very thin sheet of air lying over the surface of the wing (and all other surfaces of the aircraft). Because air has viscosity, this layer of air tends to adhere to the wing. As the wing moves forward through the air, the boundary layer at first flows smoothly over the streamlined shape of the airfoil. Here the flow is called laminar and the boundary layer is a laminar layer. Prandtl applied the concept of the laminar boundary layer to airfoils in 1904.[6][7]
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Old 12-08-2012, 06:59 AM   #16 (permalink)
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The ridges are from the way they are made, Dylan explained it to me I have a set of Lynx blades on one of my mcpxs
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Old 12-08-2012, 07:09 AM   #17 (permalink)
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Ridges designed for boundary layer control would run spanwise (perpendicular to the flow). These ridges are chordwise, so I doubt there is an aerodynamic purpose.
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Old 12-08-2012, 08:14 AM   #18 (permalink)
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Its totally a theory just saying there's a reason they didn't design that ridge OUT of the foil. Its either good or of no consequence. If it wasn't taken out and made them easier to manufacture or cheaper or more profitable then w/e that works too in theory from our side of things.
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Old 12-08-2012, 08:19 AM   #19 (permalink)
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Quote:
Originally Posted by tchilds View Post
Its totally a theory just saying there's a reason they didn't design that ridge OUT of the foil. Its either good or of no consequence.
Are you talking about the ridge that runs the span of the blade, at about 1/4 chord? My guess would be that it's cheaper to manufacture than a nice, smooth airfoil. At this Reynolds number it's probably about as efficient.

I thought OP was referring to the many chordwise ridges, which look cool
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Old 12-08-2012, 09:10 AM   #20 (permalink)
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Does this mean I can use Ruffles potato chips on my nano. Those thongs have the best ridges!

Alright, alright... that stank. I'll go back to lurking.
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