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Re: Helicopters C

Posted: May 19th, 2018, 11:25 pm
by alylam
Lotta crashes into the walls. I did not get many times, as I was in WS most of the day.

Our team won with 3:11. I had heard that Troy was right at 3, maybe slightly better than that, and they took third.

Chuck
Albuquerque Area home Schoolers
Apparently they were 2:55, we were 2:54 :<

Re: Helicopters C

Posted: May 19th, 2018, 11:27 pm
by Unome
Lotta crashes into the walls. I did not get many times, as I was in WS most of the day.

Our team won with 3:11. I had heard that Troy was right at 3, maybe slightly better than that, and they took third.

Chuck
Albuquerque Area home Schoolers
6th was around 2:40

Re: Helicopters C

Posted: May 20th, 2018, 7:32 am
by vjindal
Lotta crashes into the walls. I did not get many times, as I was in WS most of the day.

Our team won with 3:11. I had heard that Troy was right at 3, maybe slightly better than that, and they took third.

Chuck
Albuquerque Area home Schoolers

What was the ceiling height?

Re: Helicopters C

Posted: May 20th, 2018, 8:18 am
by coachchuckaahs
It was a standard racquetball court. 20 feet?

The width was an issue for many teams. We had same for region and state.

I believe biggest factor was altitude, but that was advantage for us as we live at same altitude.

Coach Chuck

Re: Helicopters C

Posted: May 20th, 2018, 5:12 pm
by daydreamer0023
It was a standard racquetball court. 20 feet?

The width was an issue for many teams. We had same for region and state.

I believe biggest factor was altitude, but that was advantage for us as we live at same altitude.

Coach Chuck
I can confirm that width was an issue - an imperfect launch caused the heli to pin itself to the side wall and slide down, resulting in slightly less than a minute. We ended up with 32nd...which goes to show just how many teams had some sort of struggle like this.

On another note, congrats on the win to your students, Coach Chuck! I honestly wasn't too surprised to see your team perform so well. :)

Re: Helicopters C

Posted: May 20th, 2018, 7:48 pm
by coachchuckaahs
Thanks. They responded well to difficulty, borne out by much testing. The primary heli hit the wall and went to the corner on the first flight, the dreaded 1-minute wall slide. They both immediately said to each other "heli 2". The backup heli was 15 seconds off the primary, but goes up very straight. That got them the 3:11. The primary was doing 3:15 in the hotel room, landing on the bed, but the rise was a bit of a risk, which did happen.

I am proud of my kids. They worked hard, built 10 sets of rotors with various changes, and at least 6 fuselages (more, depending on where you draw the line between repair and build). They tested a LOT of rubber combos, pitch changes (by heating the blade slightly) and other factors. We logged several hundred flights with about 18 columns in our log book. We totally destroyed both Nats fuselages Monday night before Nats, and they built new ones (well, 1-1/2, one motor stick survived) in 3 hours on Wednesday before we left Thursday morning. We test flew at the hotel!

Man, I'm glad its over!

Coach Chuck

Re: Helicopters C

Posted: May 20th, 2018, 7:57 pm
by seadog
did anyone see a decrease in times at the competition? I think the air density was a factor of the lower times. At home in a 9 foot ceiling my partner and I were consistently getting times of above 3:10 however at the competition we got a time of 2:40.

Re: Helicopters C

Posted: May 21st, 2018, 12:00 am
by glouthan
Thanks. They responded well to difficulty, borne out by much testing. The primary heli hit the wall and went to the corner on the first flight, the dreaded 1-minute wall slide. They both immediately said to each other "heli 2". The backup heli was 15 seconds off the primary, but goes up very straight. That got them the 3:11. The primary was doing 3:15 in the hotel room, landing on the bed, but the rise was a bit of a risk, which did happen.

I am proud of my kids. They worked hard, built 10 sets of rotors with various changes, and at least 6 fuselages (more, depending on where you draw the line between repair and build). They tested a LOT of rubber combos, pitch changes (by heating the blade slightly) and other factors. We logged several hundred flights with about 18 columns in our log book. We totally destroyed both Nats fuselages Monday night before Nats, and they built new ones (well, 1-1/2, one motor stick survived) in 3 hours on Wednesday before we left Thursday morning. We test flew at the hotel!

Man, I'm glad its over!

Coach Chuck
Dang, 3:11, impressive time and a coincidence because I believe that is the exact same time that won the nationals helicopter event in 2012!

Did your team use the Freedom Flight kit or a homemade design? Would you mind posting a picture now that the season is over because I am really curious to see the design! Congrats to your team!

Re: Helicopters C

Posted: May 21st, 2018, 6:05 am
by coachchuckaahs
It was our own design. But we are on the road for a week. Yellowstone, then college visits. I'll see what I can do after that

Coach Chuck

Re: Helicopters C

Posted: May 21st, 2018, 8:22 pm
by Ten086
It was our own design. But we are on the road for a week. Yellowstone, then college visits. I'll see what I can do after that

Coach Chuck
Congrats to you and your team! Was it a triple rotor Chinook by any chance? I was hoping to see one of those at the tournament, but it seems like everyone in my time block just had the kit. Are your students willing to post a picture of their helicopter on the Best of 2018 builds page after the trip? Hope you all have fun!

Re: Helicopters C

Posted: May 21st, 2018, 10:15 pm
by coachchuckaahs
Two rotor. Lots of carbon features to get under 3g

Can you send a link to that best of page?

Coach Chuck

Re: Helicopters C

Posted: May 21st, 2018, 10:18 pm
by PM2017
Two rotor. Lots of carbon features to get under 3g

Can you send a link to that best of page?

Coach Chuck
Here you go: https://scioly.org/wiki/index.php/The_Best_of_2018

Re: Helicopters C

Posted: May 30th, 2018, 7:09 pm
by glouthan
Not sure if anyone is still on these forums but since the 2018 season is over I decided to compile a video showcasing our helicopter designs from the 2018 season, including a TRIPLE ROTOR chinook helicopter! Check out the video to see it!

https://www.youtube.com/watch?v=CTTWWlr ... e=youtu.be

Re: Helicopters C

Posted: May 31st, 2018, 8:12 am
by CrayolaCrayon
I love that three rotor design. I wish I had tried something like that. How did you pull that off (with winding, construction, etc.)?

Re: Helicopters C

Posted: May 31st, 2018, 11:09 am
by glouthan
I love that three rotor design. I wish I had tried something like that. How did you pull that off (with winding, construction, etc.)?
Construction used the same principles as the 2 rotor as in we needed to keep the rotors on the bottom so the center of mass would be lower (more stability) and of course we had to use some sort of stability vane in order to keep the flight variance down. My thinking process behind this design was that it would be more efficient to use a triangle stabilizer instead of the "X" shaped one with 2 rotors as we could get the weight lower per rotor (3g for 2 rotors = 1.5 g/rotor, but with 3 rotors we could try getting the overall weight down past 4.5g, reducing the weight per rotor). As for the rotors 2 were spinning clockwise and one spins counter clockwise - we never had any issues with this configuration and our flights were stable meaning that even over the approx. 100' height ceiling at state the helicopter would remain only a few horizontal feet from where we launched.

Winding was the tricky part. We eventually started using mini binder clips attached onto the motor sticks to hold the rotors in place so that we could wind the next motor without having to hold the other rotor in place. This was especially helpful when all 3 motors were on as only one of us would have to carry it over to our launch spot then we would we would undo the binder clips and release. It would be difficult moving the 3 rotor device while both of us were holding the rotors - risk of breaking the motor sticks would be high!