Interesting concept in the new Nano main blades.....

[NCcraig]

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.



I'll have to wait until tomorrow to give them a spin. I'm curious to see how they fly.

[PauloG]

Interesting... Thanks for sharing it!


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[timox72]

I guess you can comb your hair with that after a windy day at the flying field

[NCcraig]

Originally Posted by timox72

I guess you can comb your hair with that after a windy day at the flying field

If I had hair to comb!

[feralaero]

I bet those will sound interesting!

[AWDsylez]

Has anyone from Linx said why this was done? I wonder if it was for better performance or for noise reduction.

[asodestrom]

MSRX blades have a ridge on them.

[TheMark]

Reminds me of a school ruler, they prob have a very good reason

[edjo69]

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.

[daneger21]

Originally Posted by asodestrom

MSRX blades have a ridge on them.

Look closer at the nano blades, teeny tiny ridges.

[boofy]

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.

[daneger21]

Originally Posted by boofy

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

[Rocketman777]

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".

[daneger21]

Adding ridges to rotor blades could improve helicopter agility...http://www.theengineer.co.uk/sectors/aerospace/news/adding-ridges-to-rotor-blades-could-improve-helicopter-agility/1011588.article

[tchilds]

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]

[superjet112x]

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

[feralaero]

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.

[tchilds]

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.

[feralaero]

Originally Posted by tchilds

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

[BunkerLizard]

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.