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by new horizon
December 3rd, 2011, 4:06 pm
Forum: Helicopters C
Topic: Designs
Replies: 127
Views: 19463

Re: Designs

Thanks chalker! I was having difficulty understanding that. twofortwenty, http://www.freedomflightmodels.com/paypal.htm is the kit that most teams used last year, it's 50 dollars per kit. Though it's not optimized for this year so you would have to do some adjustments like changing the size of the r...
by new horizon
December 1st, 2011, 8:56 pm
Forum: Helicopters C
Topic: Designs
Replies: 127
Views: 19463

Re: Designs

What exactly is a helical design? Is there a certain shape of the rotors it has to be, or is it just a higher angle near the shaft that decreases as one moves along the rotor? (So pitch would be consistent throughout the rotor)
by new horizon
September 8th, 2011, 5:41 pm
Forum: Helicopters C
Topic: Designs
Replies: 127
Views: 19463

Re: Designs

For the Chinook helicopter, you have to keep the counter rotating rotors. You have one rotor that spins CW and one that spins CCW, and assuming both have the same torque, they will theoretically cancel each other out. It's very similar to having two free rotors. If you don't cancel the torques out t...
by new horizon
May 24th, 2011, 5:24 pm
Forum: Helicopters C
Topic: Duration
Replies: 305
Views: 27148

Re: Duration

What type of balance are you referring to? Balance of the mass of the rotor? Pitch?
by new horizon
May 23rd, 2011, 1:54 pm
Forum: Helicopters C
Topic: Duration
Replies: 305
Views: 27148

Re: Duration

Was anyone successful in building a tandem rotor design or were all the helicopters coaxial? Also were there any kit designs that placed in the top 6 at nationals?
by new horizon
May 23rd, 2011, 1:53 pm
Forum: 2011 Invitationals, Regionals, and States
Topic: New Jersey 2011
Replies: 54
Views: 9643

Re: New Jersey 2011

Congratulations! That's quite an achievement. :D
by new horizon
May 11th, 2011, 7:06 pm
Forum: Helicopters C
Topic: Duration
Replies: 305
Views: 27148

Re: Duration

For bending balsa, bending the wood along a form and completely drying it out so there's little to no springback and then slicing it with a balsa stripper will make a really good rib that's pretty strong. I'm pretty sure it's to do with the grain of the grain is going with the rib. The only drawback...
by new horizon
April 17th, 2011, 6:39 pm
Forum: Helicopters C
Topic: Duration
Replies: 305
Views: 27148

Re: Duration

To my knowledge that's mostly due to a high CoG, adding ballast to the bottom of the helicopter will help with most of those issues. Though I'm not sure if flat bladed helicopters circle more during their flight, ours did. Perhaps that is due to the fact that our flat bladed rotors had a very low pi...
by new horizon
April 17th, 2011, 3:59 pm
Forum: Helicopters C
Topic: Height of flight
Replies: 10
Views: 2773

Re: Height of flight

Yeah that specific design that hovered well followed that trend, the rotors were balsa and rather narrow. The pitch wasn't extremely high but it was slightly overweight so when it hovered the time was around 28 or so seconds. For our competition, we used a different helicopter that didn't hover so w...
by new horizon
April 16th, 2011, 4:57 pm
Forum: Helicopters C
Topic: Height of flight
Replies: 10
Views: 2773

Re: Height of flight

I'm sorry if this is late, but it seems everyone is advocating a tether because it's difficult to control altitude. It is not, management of the torque on the rubber by dewinding and trimming allowed us to control the altitude of our flights at regionals where the girders were very unforgiving. Sure...
by new horizon
April 16th, 2011, 4:54 pm
Forum: 2011 Invitationals, Regionals, and States
Topic: New Jersey 2011
Replies: 54
Views: 9643

Re: New Jersey 2011

Sorry this is a late reply, but that is very true. Flight events have been normally like that with kits, but for helicopters you have more of a design flexibility, if you will, compared to wright stuff. I believe the top 6 teams for wright stuff all used the freedomflight kit, and it came down to mo...
by new horizon
April 16th, 2011, 4:48 pm
Forum: 2011 Nationals
Topic: Will/Did you make it to nationals?
Replies: 467
Views: 34018

Re: Will/Did you make it to nationals?

Yeah, I think a lot of the people on here are pretty dedicated. However, the rest of their team may not be. I'm lucky I'm from a pro district. This year at states, the top two in both divisions were schools from our district. But, I don't know ANYONE here from Community (the NJ Div B powerhouse tha...
by new horizon
April 14th, 2011, 7:38 pm
Forum: Helicopters C
Topic: Duration
Replies: 305
Views: 27148

Re: Duration

Thank you Jeff and chalker, the information posted in this thread is really useful to me and probably many other people. Thank you for sharing your insights! I'm really excited for starting to build new helical rotors. :D
by new horizon
April 13th, 2011, 5:49 pm
Forum: Helicopters C
Topic: Duration
Replies: 305
Views: 27148

Re: Duration

Most likely the distance from the most top point to the most bottom point on a rotor.

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