Search found 11 matches

by talicoa
March 3rd, 2013, 2:48 pm
Forum: Helicopters B
Topic: Pitch of Rotors
Replies: 5
Views: 2484

Re: Pitch of Rotors

For the highest efficiency, they should be flatter at the tip and steeper towards the center. The rotor spins faster at the tip. Look at a real aircraft propeller. It seems like this would be hard to build, but it pretty much comes naturally when you make blades with the leading and trailing edges r...
by talicoa
March 3rd, 2013, 2:37 pm
Forum: Helicopters B
Topic: Motors
Replies: 3
Views: 2046

Re: Motors

We tie an overhand knot and then place a small amount of super glue between the two ends near the knot. We haven't had one fail yet if the knot is pretty tight to begin with. It lets you cut the ears pretty close to the end too. Works good even with lube. Does anyone soak their motors in Armour-All?...
by talicoa
March 3rd, 2013, 2:13 pm
Forum: Helicopters B
Topic: Duration
Replies: 57
Views: 11705

Re: Duration

If you can stop the top rotor, you can get better flight times. The torque in the rubber band is only able to drive the rotor at a certain speed. It won't spin twice as fast. The rubber motor unwinds at a slower rate due to higher drag. With both blades spinning they more efficiently use up the wind...
by talicoa
May 24th, 2010, 6:02 pm
Forum: Wright Stuff B
Topic: Nationals results
Replies: 43
Views: 11077

Re: Nationals results

I don't think any planes made it near the top. Maybe some hit the side. Here are a few photos from Nationals to give some perspective. http://farm5.static.flickr.com/4064/4637506262_5211d2cd94.jpg The toss. http://farm4.static.flickr.com/3373/4636895975_8cf43054e5.jpg The Armory. http://farm5.static...
by talicoa
May 24th, 2010, 4:03 pm
Forum: Wright Stuff B
Topic: Nationals results
Replies: 43
Views: 11077

Re: Nationals results

Booth had 3:47 seconds if my brain and calculator work correctly. I watched them a number of times in practice and I could swear they got over 4 minutes a few times. They did have a tough first run almost flying it into the ground. Very nice recovery from this for their second run. It made it all th...
by talicoa
May 24th, 2010, 6:48 am
Forum: Wright Stuff B
Topic: Nationals results
Replies: 43
Views: 11077

Re: Nationals results

Booth did great, but not 8 minutes. I didn't time them other than looking at a clock on the wall, but I believe they were around 4:30 prior to factoring in the bonus.
by talicoa
April 14th, 2010, 5:10 pm
Forum: Wright Stuff B
Topic: Flight Times
Replies: 175
Views: 24373

Re: Flight Times

The best time was 4:00 on the state bonus wing. Calculated out it was 4:48. It was very impressive to watch. AA winner was around 4:30 also impressive. Our best time was 4:05, in practice :-) 3:25 when it counted. It was enough for 4th place AA.
by talicoa
March 4th, 2010, 6:53 pm
Forum: Wright Stuff B
Topic: Flight Times
Replies: 175
Views: 24373

Re: Flight Times

eta150 wrote:How tall was the gym?
It was between 26' and 28' without too much hanging down. We got lucky and only tapped the beams up top a couple of times.
by talicoa
March 3rd, 2010, 6:23 am
Forum: Wright Stuff B
Topic: Flight Times
Replies: 175
Views: 24373

Re: Flight Times

Our team flew 2:39 for both flights last weekend at the New Trier regional in North Eastern Illinois. It was good enough for third place. The winning time was around 2:52. The Gym was very narrow, and a lot of people made contact with the walls, and backboards.
by talicoa
December 1st, 2009, 7:49 pm
Forum: Wright Stuff B
Topic: Airfoils
Replies: 18
Views: 7294

Re: Airfoils

Thinking about this with a simple airfoil, the benefit seems to be in part driven by the different velocities of air over the top wing and the slower air under the wing. That's where the comment of putting covering on the bottom of the wing comes from. Keep that air in a straighter line and there is...

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