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Old Apr 21, 2006, 08:17 AM
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Pretoria, RSA - 35MHz
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Noob question on jargon

I've just read the review on Hyperion's Yak-54 and the author says "...so be sure to use some expo on all of the surfaces for that first flight...".

Can somebody explain what "expo" is, please? He goes on to say, "...I prefer 30% expo on low rates, and 70% on the higher 3D rates..."
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Old Apr 21, 2006, 09:22 AM
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Joined Apr 2006
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Exponential is a programmable setting in a nice computer radio transmitter that makes the airplane a little less twichy and easier to keep steady (less prone to overcontrol). The way it works is a little technical and if I tried to explain it, it would be corrected by numerous other posters, so I will leave it up to them to add more detail if they want.
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Old Apr 21, 2006, 09:30 AM
Master of 1 point landing
Naperville, IL
Joined Jul 2005
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Quote:
Originally Posted by Barry2
Exponential is a programmable setting in a nice computer radio transmitter that makes the airplane a little less twichy and easier to keep steady (less prone to overcontrol). The way it works is a little technical and if I tried to explain it, it would be corrected by numerous other posters, so I will leave it up to them to add more detail if they want.
Certainly not correcting, just expanding. Exponential controll means that the control surface will not move linearly with the stick. Positive expo means that small throws on the stick around neutral move the control surfaces a great deal, negative exponential means small throws around neutral move the control surface very little. I typically use some negative expo in my TX for all my models. Just makes it a bit more sluggish around neutral for my heavy thumbs. Full throw on the stick is allways max deflection regardless if expo is + or -. Expo comes from 'exponential curve'
hope that helps
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Old Apr 21, 2006, 09:33 AM
fly more...build less
Calgary AB
Joined Mar 2005
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Exponential is a function on computer radios that allows you to move the control stick half way and have the actual control surface move less than half way.

The percent entered determines how much less the control surface moves compared to the transmitter stick.

BTW when you move the stick to full the control surface moves to full too.

I am sort of oversimplifying.
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Old Apr 21, 2006, 10:37 AM
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Expo and more at http://www.futaba-rc.com/glossary.html
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Old Apr 24, 2006, 05:58 AM
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Pretoria, RSA - 35MHz
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Ok, I got it! Thanks!

Next question: can somebody explain the differences between pattern flying and 3D?
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Old Apr 24, 2006, 12:24 PM
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AFAIK, pattern flying is doing a specific set of recognized manoevers - Cuban 8's, Immelmanns, etc. 3D is free form.
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Old Apr 24, 2006, 12:52 PM
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Yes, and much of 3D is done at full stall, hanging from the prop thrust, or at extremely high alpha. Stuff that you are not likely to see a real airplane do. The hover is the classic example, and executing a loop while flying in knife edge is another. The difference is sometimes described as flying on the prop vs. flying on the wing.
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Old Apr 24, 2006, 01:35 PM
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Princeton NJ
Joined Dec 2003
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Quote:
Originally Posted by EchoZuluRomeo
can somebody explain the differences between pattern flying and 3D?
Night/Day, man/woman, catsup/mustard....

Pattern involves flying through a series of pre-determined maneuvers. The judges look for how precisely youve done it and score you accordingly.

3D involves very little flying and an astounding amount of flips, rolls, tumbles and hovering. 3D competitions are typically indoors because the planes really dont travel very far.
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Old Apr 25, 2006, 02:57 AM
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Thank you all so much for your input!

I've seen quite a few shock-flyers do all that hovering stuff which, personally, doesn't really appeal to me. Now that I understand what the official terminology is, I'd say I'm more interested in pattern flying.
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Old Apr 25, 2006, 10:03 AM
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http://www.nsrca.org/d7/practice.htm has the majority of patterns AND videos so you can see what they are and how they are done! Pretty cool.
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