Future Aviation Events

retired1
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Re: Future Aviation Events

Postby retired1 » August 19th, 2012, 11:16 am

Quite simple. I provide some equipment and materials for the teams that I mentor. Last year it was $1500 that I kept track of. It will hurt if I wasted $250.

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Re: Future Aviation Events

Postby mrsteven » August 19th, 2012, 7:07 pm

retired1 wrote:Quite simple. I provide some equipment and materials for the teams that I mentor. Last year it was $1500 that I kept track of. It will hurt if I wasted $250.

... 250 is about my entire budget last year for all the engineering events for me to cover.
Mhm, thats very nice that you provide that to the team you mentor!
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Re: Future Aviation Events

Postby retired1 » August 19th, 2012, 7:15 pm

Well, last year was 2 HS and 3 MS teams and a total of 9 events. Being retired has some benefits, time being one.

Robot arm is going to wipe out the budget this year.

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Re: Future Aviation Events

Postby mrsteven » August 19th, 2012, 8:41 pm

oh, well thats pretty cool. I hope I can still stay involved in S.O. after I graduate this year with helping out teams.
I hear you on that one. Since I'm doing at it with the intention of trying to medal, the rest of my events are suffering significantly in funding where I might not even be able to get a competitive boom or g-vehicle out there and still dig in a few hundred in my pocket.

Anyway, rules come out soon! Glad to hear that so I can get the ball rolling with getting materials and finishing up designs to the new specs.
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Re: Future Aviation Events

Postby illusionist » August 20th, 2012, 3:55 am

Honestly, a decent robot arm isn't going to cost you hundreds of dollars. An operational one can be built for under $100. A really competitive one can easily be built for $175. After a certain point, the ability of the arm becomes less important and the ability of the student who controls the arm rises.
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Re: Future Aviation Events

Postby mrsteven » August 20th, 2012, 10:52 am

Thats true, just that I'm a little weird and want to do things the difficult way. I dont want a run-of-the-mill craw arm and remotes i want to do something more interesting and challenging to build and control.
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Re: Future Aviation Events

Postby Orange714 » August 20th, 2012, 6:08 pm

Anyone have the articles from the website saved and could you send me? I really do hope that the site comes back up...otherwise it would be very very bad.

Thanks in advance :D

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Re: Future Aviation Events

Postby twototwenty » August 20th, 2012, 7:07 pm

Orange714 wrote:Anyone have the articles from the website saved and could you send me? I really do hope that the site comes back up...otherwise it would be very very bad.

Thanks in advance :D


I, while writing the ELG page on the wiki, did end up summarizing a lot of those articls, so you should check the wiki pages out; it might be helpful.

If the page still isn't back by the time school starts, I will scan and upload the plans I have printed out from the site to the wiki (pending approval from the wiki mods).

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Re: Future Aviation Events

Postby _HenryHscioly_ » August 24th, 2012, 2:06 pm

I've broken two planes, where the fuselage ripped off from the wing when I launched.
The wing to fuselage connection was flat, 1/8"x2".
I used loctite super glue gel.

Is the glue no good for that kind of joint? something else like woodglue or modelcement glue?

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Re: Future Aviation Events

Postby fozendog » August 24th, 2012, 2:34 pm

_HenryHscioly_ wrote:I've broken two planes, where the fuselage ripped off from the wing when I launched.
The wing to fuselage connection was flat, 1/8"x2".
I used loctite super glue gel.

Is the glue no good for that kind of joint? something else like woodglue or modelcement glue?

CA Glue might work. Your wings might also be inclined too much so that force rips it off.
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Re: Future Aviation Events

Postby retired1 » August 24th, 2012, 8:32 pm

Look at the glue joint on the wings. I suspect that you will find tiny slivers of the fuselage there. A remote possibility is it is the wing grain pulling out. If you look at the fuselage, you might find the slivers there. This is because gel does not penetrate into the balsa deep enough and you are only gluing the outer ring of the balsa grain and it is failing. I have seen this on towers. I would make a new fuselage and rotate it 90 degrees from the way you made the two. An alternative is to go to a thinner CA glue. Ambroid or Duco airplane glue might work better, but take a full day to cure.
Which model are you building?
If that does not work, add a bead of glue on both sides of the fuselage at the wing joint. You might try adding a doubler of say 1/16 balsa at that joint. I do not care for this idea as it adds weight, but will strengthen the joint.

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Re: Future Aviation Events

Postby twototwenty » August 25th, 2012, 4:55 am

Also, make sure that it is the glue joint...that it isn't the wings hitting the launch handle. I know this seems unlikely, but it has happened to me once or twice when I was launching with poor technique.

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Re: Future Aviation Events

Postby _HenryHscioly_ » August 25th, 2012, 3:16 pm

how does duco and ambroid glues work?
is this similar?

http://www.walmart.com/ip/Henkel-NB-Mul ... escription
The walmart near me has a lot of these, and they are only $1 each.
It is translucent and the glue becomes gel-like really soon after i squeeze out.

Would wood glue work? It seems kinda thin and not viscous.
I tried to laminate 3 long pieces with wood glue this summer, and it ended up really bent...

I have been making random planforms and parts based on what scrap balsa I have.

Maybe I should get thinner rubber and/or use longer piece.. Not sure how thick, I think i used .125", 6" loop
Is .125" okay..? Because that's the rubber I have most of. Dug through my fridge and found a foot or two of thinner rubber.
When I launched, I was only halfway to stretching my arms all the way. xD

And there were no dents on the wings, so shouldnt have been hitting the handle.

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Re: Future Aviation Events

Postby twototwenty » August 25th, 2012, 4:08 pm

Yeah, I'm sure you would've known if the wings were hittng the launch handle.

Honestly, wood glue is going to be far too thick and heavy for this event...CA glue is really the way to go. The thinnest CA glue is less viscous than water, and the balsa should really soak it right up. I actually have been using extra thick Ca glue, which is a little thicker than water, and I haven't had any problems with it yet, although I haven't tried particularly vigorous launches yet.

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Re: Future Aviation Events

Postby retired1 » August 25th, 2012, 7:05 pm

Ambroid and some Duco glues are acetate (or similar) dissolved in a solvent. Typically acetone. They offer the advantage of easily being thinned as desired and then a tiny amount used. Most of the glue weight evaporates so is lighter than CA. It takes quite a while to set which allows you a bit of time to reposition stuff if needed. It can be dissolved with acetone easier than CA and will re-glue by softening with a touch of acetone and more glue added if needed. CA joints that were taken apart with acetone should be scraped or sanded to remove the old glue to get a good glue job. It is the difference of evaporation and internal setting.

Everybody has their likes and dislikes and some are very adamant on it. Techniques will be a bit different for each. Go to the new area "glue" for more discussion. The secret is in using just the right amount.

My tower students went to CA because of time.

When you laminate wood, it must be clamped--regardless of the type glue used or it will warp.

Based on what I have read, rubber will be 6-7" loop and a bit bigger than 1/8". Some people are using 1/4". That is probably a bit much for low ceilings and light gliders.

I have never kept rubber in the fridge. I use a cool dark place. Light is the killer.


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