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10-15-2005 05:12 PM  12 years agoPost 1
spork

rrVeteran

Mountain View, CA

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I have the Align carbon blades (black with yellow graphics). I'm interested in removing the yellow graphics (top of blades) without destroying the blades. Has anyone done this? Any tips?

Thanks.

RC

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10-15-2005 11:29 PM  12 years agoPost 2
TheX

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Newport Beach, California

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That should be fine, it's the bottom that actually serves a purpose.

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10-16-2005 12:13 AM  12 years agoPost 3
AnnihilaT

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The Netherlands

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unless you are flying inverted.

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10-16-2005 01:41 AM  12 years agoPost 4
MikeInMobile

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Mobile, Alabama

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Leave the stickers on the blades. Black blades become invisible when spinning. I don't know if you have ever been hit by a spinning blade, but it is not pleasant! The top of the blade MUST have some type of "not-black" marking on it !

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10-16-2005 03:21 AM  12 years agoPost 5
spork

rrVeteran

Mountain View, CA

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Hmmmm.... I was actually hoping to hear *how* to remove the graphics without damaging the blades - not *if* I should remove them. We used to run all black blades on the .60 nitro helis without any problem. Maybe because they're bigger it's less of an issue.

In any event it's no longer an issue for me anyway. My heli had a fairly abrubt arrival today and is now in need of new blades. This will give me the chance to try the 335 woodies that I wanted to try anyway. Plus, they're all white which is my preference as well.

Thanks for the tips.

RC

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10-16-2005 05:28 AM  12 years agoPost 6
TheX

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Newport Beach, California

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AnnihilaT, the top isn't covering any holes like the bottom is so why would flying inverted make any difference? As far as all black blades are concerned I use to fly straight carbons but I would much rather see the disk. I put bright orange on top of the blades if I'm flying at any large distance just in case. Don't want to lose orientation.

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10-16-2005 09:57 AM  12 years agoPost 7
AnnihilaT

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The Netherlands

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Oh i was responding to the comment that it was " the bottom of the blade that did anything useful". Was just being a smart ass

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10-16-2005 10:04 AM  12 years agoPost 8
OICU812

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Edson, Alberta, Canada

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Black blades become invisible,, thats a good one, lol. I have used Rotor Techs "Completely black" on my Raptor and I have not seen this magic show you speak of. ....Weird........

...Once upon a time there were Nitros, flybars and frequency pins...

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10-16-2005 03:40 PM  12 years agoPost 9
spork

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Mountain View, CA

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That should be fine, it's the bottom that actually serves a purpose.
I'm curious. By "serves a purpose" do you mean visibility, or aerodynamically? The top surface is more important aerodynamically, but I suppose you normally (or at least often) look at the bottom.

RC

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10-16-2005 04:02 PM  12 years agoPost 10
MikeInMobile

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Mobile, Alabama

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In a semisymetrical blade, the upper surface of the blade IS more important, but when using a symetrival blade, neither surface of the blade is more important than the other as far as generation of lift is concerned. ALL lift generated by a symetrical blade is a function of the angle-of-attack for the blade. At neutral (0 pitch), a symetrical blade generates NO lift. Conversly, lift generated by a semisymetrical blade is a function of the natural lift due to the airfoil PLUS the lift generated by the angle-of-attack. At neutral (0 pitch), a semisymetrical blades DOES generate lift.

Either surface of the blade CAN disrupt the flow of air, and therefore increase drag on the blade, thus increasing the amount of energy required to turn the blade.

The covering on the bottom of the blade covers holes in the structure of the blade (old style Align carbon blades). I haven't checked the newest release of blades .... they may be different !

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10-16-2005 04:38 PM  12 years agoPost 11
spork

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Mountain View, CA

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but when using a symetrival blade, neither surface of the blade is more important than the other as far as generation of lift is concerned. ALL lift generated by a symetrical blade is a function of the angle-of-attack for the blade.
True (sort of), but the "top" of the blade is still more critical in creating lift. Essentially, at non-0 AOA the blade is no longer symmetrical. By "top of blade" I mean the surface towards which the blade is lifting (which could be any direction relative to gravity - depending on the maneuver).

RC

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10-16-2005 04:47 PM  12 years agoPost 12
Ozydego

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Westerville, Ohio

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I would have to agree with Mike, on a symmetrical blade both surfaces have the same airfoil, therefore one doesn't cause any more negative air pressure than the other at any AOA, When changing the AOA, speed is creating the negative air pressure coupled to the angle, not the blades themselves. Speed in this case is what causes changes in the negative air pressure which causes more or less lift...

But Honey, I can't live with just stock.....

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10-16-2005 04:59 PM  12 years agoPost 13
spork

rrVeteran

Mountain View, CA

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on a symmetrical blade both surfaces have the same airfoil, therefore one doesn't cause any more negative air pressure than the other at any AOA,
All you have to do is look at a symm foil in a wind tunnel with smoke streams. At non-0 AOA it sure looks a lot like a non-symm airfoil (and to the wind - it is). By definition the "top" of the blade has a lower pressure profile, than the bottom in this configuration.

RC

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10-16-2005 05:06 PM  12 years agoPost 14
Ozydego

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Westerville, Ohio

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Technically speaking, the blade does not change shape when you change the AOA, the airfoil does not warp as you apply an angle... therefore the blade does not "become" an asymetrical airfoil, it just "acts" as one because of physics, the symmetrical blade does not change into an asymmetrical blade magically.

But Honey, I can't live with just stock.....

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10-16-2005 05:52 PM  12 years agoPost 15
spork

rrVeteran

Mountain View, CA

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Technically speaking, the blade does not change shape when you change the AOA, the airfoil does not warp as you apply an angle...
True. I certainly didn't mean to suggest otherwise.
the blade does not "become" an asymetrical airfoil, it just "acts" as one because of physics,
That's all I'm saying.
the symmetrical blade does not change into an asymmetrical blade magically.
Of course not. But at non-0 AOA it IS asymmetrical w.r.t. the flow, and thus behaves as an asymmetrical foil - thereby causing lift.

I will now try to bow out of this discussion (gracefully - if it's not too late) before any feelings are hurt.

RC

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10-16-2005 08:17 PM  12 years agoPost 16
Ozydego

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Westerville, Ohio

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Actually, we are now in total agreement

Question, Do your blades have the holes in the bottom?? I am wondering this, because the older styles did, I was wondering if they have changed the design...

But Honey, I can't live with just stock.....

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10-16-2005 10:13 PM  12 years agoPost 17
spork

rrVeteran

Mountain View, CA

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Question, Do your blades have the holes in the bottom?? I am wondering this, because the older styles did, I was wondering if they have changed the design...
Mine do have holes in the bottom - covered by decals. One of mine now has gaping air-gap in the middle (i.e. it's broken in half) - so now I get to try the 335 woodies. I'm not sure how old my blades are. I bought the whole thing used (with most of the upgrades already installed).

This is just as well since I was debating whether to replace them with the woodies anyway. I'm really impressed with how this little electric flies with one exception. Mine has a strong tendency to nose up in FFF. I have several things I want to try to correct this:

- Try the woodies
- Increase head speed (I think I'm running below 2K)
- Maybe put a touch of negative pitch in the paddles
- Add weights to the paddles if necessary
- Change the Bell-Hiller mixing ratio if all else fails.

I'm open to any other ideas as well. This forum is great for saving lots of time and money experimenting. I've learned a ton about the electrics in a short time. Still plenty left to learn though : )

RC

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