Search found 286 matches

by new horizon
December 3rd, 2011, 4:06 pm
Forum: Helicopters C
Topic: Designs
Replies: 127
Views: 21161

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: 21161

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: 21161

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: 29562

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: 29562

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: 10758

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: 29562

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: 29562

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: 3082

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: 3082

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...

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