Rotors
- lucwilder42
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Re: Rotors
Instead of two flat blades, the rotors start vertical at the axis and then gradually transition into more of a horizontal orientation. check out the image gallery for many examplesthsom wrote:What is meant by helical shaped rotors?
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- mrsteven
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Re: Rotors
Essentially what you see most people use. They have curved ribs to conform with the shape.lucwilder42 wrote:Instead of two flat blades, the rotors start vertical at the axis and then gradually transition into more of a horizontal orientation. check out the image gallery for many examplesthsom wrote:What is meant by helical shaped rotors?
Elliptical is the same idea, but in an egg type shape to reduce drag
edit: usually has a film or paper covering to make the transition from the horizontal to vertical and curved to have a kind of air foil type thing
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Re: Rotors
Is this an example:
http://gallery.scioly.org/details.php?image_id=3291
or this:
http://gallery.scioly.org/details.php?image_id=3327
http://gallery.scioly.org/details.php?image_id=3291
or this:
http://gallery.scioly.org/details.php?image_id=3327
- mrsteven
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Re: Rotors
first one.thsom wrote:Is this an example:
http://gallery.scioly.org/details.php?image_id=3291
or this:
http://gallery.scioly.org/details.php?image_id=3327
2nd is either elliptical or just flat blades depending on if the egg shape is contorted or not
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Re: Rotors
Ok, well I have built both and gotten a significantly better time with the non-helical one (not eliptical either, the one I linked to at sciencenc.com). I am not sure why, but it may be due to the lack of skill I have and no jig for building those rotors. I'll stick with the other one, (with my modifications I was able to get a 2:27).
- mrsteven
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Re: Rotors
I'd be interested in hearing about this helicopter getting a 2:27 without a jig, thats quite a feat for a novice builder (even for some of us veterans).thsom wrote:Ok, well I have built both and gotten a significantly better time with the non-helical one (not eliptical either, the one I linked to at sciencenc.com). I am not sure why, but it may be due to the lack of skill I have and no jig for building those rotors. I'll stick with the other one, (with my modifications I was able to get a 2:27).
Especially from such an elementary design as the NC SO site you posted before had.
Do you use a large cord length or a specifically odd rubber width?
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- Frogger4907
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Re: Rotors
are you talking about the one on this page? http://www.sciencenc.com/event-help/helicopters.php you confused me when you said "The one I linked to"thsom wrote:Ok, well I have built both and gotten a significantly better time with the non-helical one (not eliptical either, the one I linked to at sciencenc.com). I am not sure why, but it may be due to the lack of skill I have and no jig for building those rotors. I'll stick with the other one, (with my modifications I was able to get a 2:27).
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