Designs

Taran
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Re: Designs

Postby Taran » April 27th, 2010, 10:44 am

Probably something that looks like a Leading Edge or Freedom Flight would work.

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Re: Free Leading Edge Download

Postby wlsguy » April 27th, 2010, 11:04 am

I received an email fro A2Z aka Peck Polymers for a snow sale (it snowed in Denver this week) with a note that you could download for free the Leading Edge plans. The link is

http://www.a2zcorp.us/freedownload/Lead ... nePlan.pdf

You may note on the plans the caveat about the tip plates consistent with Jander's warning to me--the plates must be glued on at exactly 90 degrees.
A common design is available above.
Yes, I can be built rather quickly (2~3 hours) if you have the materials

I will say that 2 days before the State Competition is very late to be building.
Unless you have time to practice, don't expect great results. (and don't blame the design because it is one of the better ones out there)

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Re: Designs

Postby jander14indoor » April 27th, 2010, 11:38 am

2-3 hours build needs a lot of experience building these models as well as materials to complete a Leading Edge design.

OK, if goal is 45 seconds, take that design and SIMPLIFY.
Select fairly light balsa, say 7-8 lb/ft3.
Reduce wing size to 10 cm chord. Use 3/32 by 1/16 inch sticks on edge for spars. Same for ribs, don''t worry about curve. Don't use fins, crack the spars and kick up the outer 10 cm of each tip by 3 cm or so. Glue cracked spars to lock in dihedral. Cover with light tissue or light plastic grocery bags.
Glue a 1/8 by 1/4 hard balsa stick along the chord 1 cm to right of center line so it sticks out beyond wing about 1 cm. Glue a 1/8 inch riser under the leading edge. Make sure the wing is flat or left leading edge is twisted higher than right a little. NOT the right leading edge higher than left.

Tail, build a flat rectangle 5 cm longer than the max span the rules allow by say 5-6 cm chord. Again, build it flat, but with 1/16 inch square. Cover same as wing. Crack the spars and kick up the outer 2.6 cm of both tips by 90 degrees.

Motor stick, 10 inchs long by 1/4 by 3/8 light balsa. Tail boom 8-12 inches 1/4 by 1/8 tapering to 1/8 by 1/8. Offset tip of tailboom to centerline of motorstick about 1/2 inch to the left. Add tail hook and prop hanger, reinforce with thread wrapping coated by glue.

Glue the rear stab on with a 1/16 inch riser under the rear spar. Make sure it tilts to the right so left tip is 1/2 or so higher than right.

Attach wing to motor stick with dental bands front and back. Slide wing to balance with prop, motor, everything at about the rear spar to start.

Test glide with a couple hundred winds in a 3/32 1.5 gm motor. It should fly level with a slight descent. If stalling move wing back. If diving, move wing forward or raise leading edge by wedging a piece of wood under the attachment stick at front. Add winds to start climbing. WIND it. Lube your motors.

If you are under 10 grams and trim it right, such a plane can hit 45 seconds. With two days, your goal should be to finish your plane and trim it well enough to fly at least level in a 30 foot diameter circle. Any more is gravy in that short time, unless you have a mentor on hand.

Oh, and spend some time reading the 800 or so messages in this forum.

Good luck

Jeff Anderson
Livonia, MI

calgoddard
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Re: Designs

Postby calgoddard » April 27th, 2010, 1:46 pm

Cezar Banks' 2010 WS airplane is a very good design. Built correctly, trimmed properly, and with the proper rubber and winds, it can win Nationals.

That being said, I have a fair amount of experience and it would take me 8 - 12 hours to build Cezar's 2010 WS airplane correctly, and then at least that much time to trim it properly and figure out the best prop, rubber, winds, etc. for the expected flight venue.

With only two days time available, Jeff Anderson has given you good advice given the fact that your goal is a 45 second flight.

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blue cobra
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Re: Designs

Postby blue cobra » May 4th, 2010, 12:46 pm

Would anyone be interested in seeing a picture of my plane? I'm just wondering, since I don't find it that impressive, but it's not the Leading Edge, so that alone kind of makes it unique this year :lol:
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Re: Designs

Postby leetx » May 5th, 2010, 8:12 am

Yes, please post a picture of your plane!

I will do the same.

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Re: Designs

Postby leetx » May 8th, 2010, 7:52 am

I posted a picture of my student's plane

Image

http://gallery.scioly.org/details.php?image_id=2228

It's a Freedom Flight model.

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Re: Designs

Postby new horizon » May 9th, 2010, 6:54 am

I think most people use freedom flight over leading edge. At states I found quite a few freedom flights.

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Re: Designs

Postby jcollier » May 9th, 2010, 7:25 am

I think most people use freedom flight over leading edge. At states I found quite a few freedom flights.
That's what I saw at Regionals. At PA States, there were more Leading Edge and its varieties. I will post a pic of our planes. Bad luck at States, but the planes fly very well.

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Re: Designs

Postby new horizon » May 12th, 2010, 1:12 pm

I think most people use freedom flight over leading edge. At states I found quite a few freedom flights.
That's what I saw at Regionals. At PA States, there were more Leading Edge and its varieties. I will post a pic of our planes. Bad luck at States, but the planes fly very well.
I think it's probably because @ regionals people put together planes rather quickly because they're focusing on other events.
our regional plane was an absolute mess. I wasn't part of the team but they ran out of mylar or something and used tissue paper, and then the day of the competition the plane broke. It was really messed up and assembled the day before.

after regionals, i was put on the team and we ended up using freedom flight cause we're all wright stuff newbies so I ended up building the backup plane and doing some testing with the main plane. I'm pretty sure we got 4th. I don't remember, though. According to one of my teammates the motor snapped and they didn't make a proper backup motor. >_>

Anyway, I was still kinda mad that a 7th grader who really didn't do anything competed in wright stuff and battery buggy, and I was too lazy to find the gym so I didn't watch. I did end up watching some of the bridges, which was so much better.

Also, are any of you familiar with those aircrafts used in the military that use their bodies to produce lift? Do you think it'd be possible to make one of those into a SO plane? just throwing it out there.

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illusionist
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Re: Designs

Postby illusionist » May 12th, 2010, 1:39 pm

That would definitely be a great challenge! I think i'll try that sometime...
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new horizon
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Re: Designs

Postby new horizon » May 12th, 2010, 1:41 pm

I'm thinking it'd probably be unstable, but I think it'd be pretty cool. I'm not sure if you can make it work, I don't know enough about the design.

And is wright stuff going to be an event next year?

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illusionist
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Re: Designs

Postby illusionist » May 12th, 2010, 3:39 pm

Probably not because the events are cycled every 2 years, and Wright Stuff has been here for the last 2 years, it will most likely be Helicopter Duration for Division C, and Bottle Rockets for Division B...
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Re: Designs

Postby jcollier » May 13th, 2010, 7:30 am

Yeah, sad that WS is cycling out. After helping with my older son since '05 through BLG and 2 years of WS in B, I am going to miss the flying events for sure. The Helicopter duration should be fun though.

The Leading Edge kit has opened up a new possibility this year, though we used to have the option of Harlan vs. Freedom Flights in earlier years. As JAnder, Calgoddard, and others have said, ANY of these plans, or a scratch build, can fly well enough to win a state or national competition if you put your time in, and wring out the possibilities of rubber, prop, and adjustments. Then, all you have to do is fly close to your best time in that 8 min. window.

For the question of the body of the plane being used for lift, it is an interesting thing. Our H.S. coach gave us a kit called the "Flying Wing" which was advertised as producing 5 min. flights. It technically conformed to the rules for the last two years. We could only get about 30-40 sec. out of it, though.
It would be interesting to try something else, but after messing with WS and BLG for this long, I doubt there is anything that would drastically increase flight times over the ones designed by multiple national champion designers.

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blue cobra
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Re: Designs

Postby blue cobra » May 13th, 2010, 2:02 pm

Making a body that produces lift does sound like a challenge, and would be quite interesting. However I think that to do that properly would be beyond the building range of most MS and HS competitors, and keeping weight down would be a problem. So it may not be practical for SO, but it definitely sounds like fun!
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