Materials/Kits

cdemoura
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Materials/Kits

Postby cdemoura » September 19th, 2015, 10:00 am

Where can I buy materials kit for Elastic Launch Glider? Please help and give your advice. Thanks! ;)

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bernard
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Re: Materials/Kits

Postby bernard » September 19th, 2015, 10:27 am

Freedom Flight Models sells a kit used by many students; the new kit hasn't been released, but I'd expect it to be released early November.

If you aren't using a kit or want extra materials...

Balsa can be found at your local hobby shop and you can inspect each piece of wood before purchasing. Online suppliers I've used include Specialized Balsa and National Balsa; If ordering online, I like Specialized Balsa better since I can specify densities/grain.

Glue can be found at your local hobby shop or online (National Balsa also sells this).

Carbon tow can be found online (e.g. The Composites Store).

Sand paper can be found at your local home improvement store or hobby shop or online.

Clay can be found at your local arts and crafts store, hobby shop, or online.
"One of the ways that I believe people express their appreciation to the rest of humanity is to make something wonderful and put it out there."

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Re: Materials/Kits

Postby retired1 » September 20th, 2015, 1:56 pm

I saw the prototype of the Freedom Flight ELG on Friday. Dave is a good builder and it is a beautiful bird. Flew it outside to a launch height of 30 + feet. Beautiful turn to glide. Flew for 25 seconds until it hit the side of the house about 10+ feet up. (closer to 15')
His glider will do better than 1 second per foot in most venues. My kids last year could not build that well
He is trying out another source for laser cutting, but I would expect the kit to be available in Oct. (Wright stuff will be a bit later)

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Re: Materials/Kits

Postby seadog » September 24th, 2015, 5:15 am

What are the major changes in the rules this year? Anyone know?
We don't have the rules as yet :(
Thanks in advance..

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Re: Materials/Kits

Postby retired1 » September 24th, 2015, 8:13 am

The major changes were reduction of the wingspan from 32 to 30 cm and min weight is now 3.5 grams.
Some very minor wording changes to the launch apparatus.

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Re: Materials/Kits

Postby seadog » September 24th, 2015, 2:30 pm

Thank you so much. 3.5 gm - that will be the hard part.
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Re: Materials/Kits

Postby Daquan » October 1st, 2015, 3:52 pm

I am having trouble understanding how to make a testing apparatus can someone please explain this to me?
Thank You

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bernard
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Re: Materials/Kits

Postby bernard » October 1st, 2015, 3:55 pm

Daquan wrote:I am having trouble understanding how to make a testing apparatus can someone please explain this to me?
Thank You

What is this testing apparatus you are referring to? To the best of my knowledge there isn't one that teams use. Unless you are referring to the launching apparatus...
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Re: Materials/Kits

Postby Daquan » October 1st, 2015, 4:20 pm

bernard wrote:
Daquan wrote:I am having trouble understanding how to make a testing apparatus can someone please explain this to me?
Thank You

What is this testing apparatus you are referring to? To the best of my knowledge there isn't one that teams use. Unless you are referring to the launching apparatus...

Sorry for the misunderstanding i meant launching apparatus.

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Re: Materials/Kits

Postby bernard » October 1st, 2015, 4:42 pm

Daquan wrote:
bernard wrote:
Daquan wrote:I am having trouble understanding how to make a testing apparatus can someone please explain this to me?
Thank You

What is this testing apparatus you are referring to? To the best of my knowledge there isn't one that teams use. Unless you are referring to the launching apparatus...

Sorry for the misunderstanding i meant launching apparatus.

A launching apparatus can be as simple or complicated as you want. For a simple one that can do just as well as a complicated one, take a wooden dowel, drill a hole near the end, thread a rubber band through, and tie a knot in the rubber band. Super simple.

You can make a slightly more complicated one like the one posted by fifty_missions last season. You could also add a plumb bob to measure angle and a ruler to measure how far you're stretching the rubber band before launch. Not sure how useful the ruler or plumb bob would be since I've never used them, just some ideas.
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Re: Materials/Kits

Postby akersbaker » October 21st, 2015, 2:27 pm

Hi. We are new to Science Olympiad and I'm confused that it's ok to use a kit. As a parent (and teacher) it seems there's more benefit to building from scratch. But would that necessarily mean our team's glider would always lose out to the kit teams? Is the challenge supposed to be in the technical details involved in tweaking the glider and designing the launcher?

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bernard
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Re: Materials/Kits

Postby bernard » October 21st, 2015, 2:32 pm

akersbaker wrote:Hi. We are new to Science Olympiad and I'm confused that it's ok to use a kit. As a parent (and teacher) it seems there's more benefit to building from scratch. But would that necessarily mean our team's glider would always lose out to the kit teams?

No, kits aren't necessarily better than self made gliders. If you're starting out, kits are very helpful because it can help you get a plane built and flying quicker. A great design doesn't help unless you've got the tweaking step down.
akersbaker wrote:Is the challenge supposed to be in the technical details involved in tweaking the glider and designing the launcher?

Yes, design is a factor you don't really have to care about unless you've trimmed your glider to perfection.
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Re: Materials/Kits

Postby jander14indoor » October 21st, 2015, 7:01 pm

The reason kits are allowed is because design is NOT the point of this event. The designs are well understood and all you'd have to do is find a design as good as any of the kits is to spend some time exploring the internet. They exist.

The point of this event is test and evaluation. Thus the flight logs. The point is to test, take data, adjust, take data, adjust, etc to optimize any given design.

Thus kits are not a 'magic' solution to the event. You still need to put in the time and effort to gather data on that design and optimize the performance. The kits that are available are perfectly good, but not beyond what a reasonably competent student can build. And its far cheaper to build from scratch.

I make the claim when I'm coaching that I can hand you my plane/glider/helicopter in pieces (so you don't just start with the ideal settings I've already determined) and you couldn't succeed without putting in that time and effort to test, take data, and find the optimum settings. Haven't been proven wrong yet. Even by experienced flyers. They just get there faster because like me they have years of data in their heads and know where to start.

Gliders/Wright Stuff/Helicopter are just convenient non-linear systems with a reasonable number of variables to test and evaluate.

Besides, they're fun.

Jeff Anderson
Livonia, MI

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Re: Materials/Kits

Postby akersbaker » October 22nd, 2015, 8:23 am

Thanks very much for the helpful advice. It's appreciated!

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Re: Materials/Kits

Postby bjt4888 » October 24th, 2015, 7:43 pm

akersbaker,

Having coached this event for Division C for a couple of years and for Division B last year, i have found the Stan Buddenbohn "SO Littl Sweep" kit to be the easiest to build for the quality of results it gives. Stan is the reigning world champion in F1N glider for ceiling category IV and his kits show excellent attention to detail. The students I have coached using this glider (previous year's rules) typically get flight times of 24 seconds or more in gyms with ceilings of about 30 ft. (launch heights usually a few feet under the ceiling). Best results with this glider, when built to minimum weight are about 1.0 seconds per foot of altitude. I believe that results will be similar with this year's rules as they are not much different than the High School rules from a few years ago.

Stan's kit glider is a very good flying and easy to build airplane. However, it is not the ultimate best flying glider. A "flapper style" glider, under the current SO rules, if properly constructed and trimmed will fly in the neighborhood of 1.1 seconds per foot of altitude. The best my high school students were able to do with a flapper glider under a 27 ft. ceiling was 27.8 - 28.5 seconds. My best was usually between 28.5 and 29.8 seconds. I posted a plan for a flapper style glider on the Hip Pocket Aeronautics, Builders Plan Gallery, along with some instructions on wood selection and sanding technique (very important). Although this plan is for a previous rule set, it can be easily scaled for this year's rules.

I have no affiliation with Stan's company, I'm just a SO coach that is interested in students having fun and flying a good glider. Here is the link to Stan's catalog:

http://www.discuskid.com/Pages/BUddenbohmProducts.aspx

Also, here is the link to a video of a glider pro building Stan's kit.

http://www.amaglider.com/?p=view&a=so-l ... p-building

Good Luck and good science. Practice, practice and practice some more and take lots of data regarding launch bank angle, inclination angle and amount of launch rubber stretch.

Brian T.
AMA since 1972 (off and on)


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