Rotors

[lucwilder42]

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).

Perhaps this is a miscommunication? Like others, I can't believe that a non-helical design would get a time as good as 2:27--it just seems to defy physics; otherwise, I think national times would be incredibly high compared to what they are now. I mean no disrespect but maybe 2:27 is supposed to be 2.27 seconds or something like that?

Nats copters were non-elliptical but helical.

[thsom]

Oh no, it is 2:27. I just tested another one however (still with non-helical rotors) but it had cured rotors and it got a time of 2:49.

[illusionist]

Oh no, it is 2:27. I just tested another one however (still with non-helical rotors) but it had cured rotors and it got a time of 2:49.

You sure you aren't trolling?

[thedoctor]

Oh no, it is 2:27. I just tested another one however (still with non-helical rotors) but it had cured rotors and it got a time of 2:49.

You sure you aren't trolling?

There has to be some sort of miscommunication between thsom and everyone else...didn't Mr. Anderson build a non-helical helicopter last year but still get a much better time with a helical one?

[illusionist]

thsom, do you understand what helical means? Does your helicopter look something like this: http://gallery.scioly.org/details.php?image_id=3315 ?

And you also said your new one has "cured" rotors. Did you mean "curved" so that they're shaped like an egg, or "curved" as in twisted?

[mrsteven]

Oh no, it is 2:27. I just tested another one however (still with non-helical rotors) but it had cured rotors and it got a time of 2:49.

You sure you aren't trolling?

There has to be some sort of miscommunication between thsom and everyone else...didn't Mr. Anderson build a non-helical helicopter last year but still get a much better time with a helical one?

i believe it was a elliptical. the thought is that theyre better if made correctly, but very hard to make correctly. I would stick with a heliptical design. The 'flat' blade design i havent seen but some say it works- but I personally wont spend any time working on it.

Until proven otherwise, I think its trolling. However, Ill be having a few of my friends recording times at COD's regionals so I guess Ill see for sure then if thsom's claims are backed up

[thsom]

thsom, do you understand what helical means? Does your helicopter look something like this: http://gallery.scioly.org/details.php?image_id=3315 ?

And you also said your new one has "cured" rotors. Did you mean "curved" so that they're shaped like an egg, or "curved" as in twisted?

Yes it does look like that one you linked to and I understand what you mean by helical, they are not helical in that picture and nor are they in mine. When I said curved I meant with air foils so literally curved rotors but still that design in the link (just with foils in the rotors).

Edit: Mrsteven, what school are you from?

[mrsteven]

I'm from BG (it even says it in my location on the left <--- )

My regional is CLC but I've got friends on teams at your regional
Hope to hear about that time- its quite an interesting time, + seeing stevenson/new trier at my regional. Should be a fun day!

edit: the 'flat' blades with an 'air foil' is essentially heliptical from how I'm visualizing this....

[Bob8372]

Would having rotors at the top of the copter cause a higher or lower center of gravity?

[thedoctor]

Would having rotors at the top of the copter cause a higher or lower center of gravity?

Well...most people have two rotors--one on top and one on bottom so that you have more lift. By the way I see you're from NC; what regionals are you in?