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  #11  
Old 05-05-2011, 12:34 PM
zog139 zog139 is offline
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Servos 4.4 gram each
2 Cell Lipo 250 mAh 17 grams
Receiver Hitec Micro 05S 9.4 grams
Speed Control GWS 2Amp 6 grams Used as a BEC



OK someone help the new guy ! What is the purpose of the Speed Control ? And the reference to "used as a BEC" ?
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  #12  
Old 05-05-2011, 12:52 PM
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ghrocketman ghrocketman is offline
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BEC can stand for one of two things here:

Bussed Electrical Center
or
Battery Eliminator Circuit
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  #13  
Old 05-05-2011, 01:51 PM
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JumpJet JumpJet is offline
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I am using a 2-cell Lipo battery for the radio. The receiver I am using likes to have a working voltage more in the five to six volt range while the Lipo produces over 7.4 volts when fully charge. The speed control with a built in BEC will drop the battery voltage down to a level the receiver can use. You can buy a BEC unit all by itself but since I had this micro speed control laying in my draw I used it instead.


John Boren
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  #14  
Old 05-07-2011, 04:30 PM
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JumpJet JumpJet is offline
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I test flew my glider two times today.

The first thing I know I did wrong was to launch the model vertically. I was way too lazy to build a custom launch rail for it but will do this for my next outing. Instead I simply stuck a ¼” Diameter lug on the top of the motor pod and put it on one of our mid power pads.

The second thing I learn is that I probably should have NOT touched the controls on boost, since the model may have been better off.

Thirdly I will most likely need to put tons of expo on the elevator for boost or use a Duel Rate and set it on low. What I really want to happen is for the model to boost hands off but since this project is just for fun I may never spend the needed time to get all the bugs worked out. I do however believe by just switching a custom pad set at a angle the model will most likely boost much better.

On the bright side even though both boost were far from straight up I got a 44 second flight on my first attempt and 57 seconds on the second attempt.


I have uploaded a video to both flights. You can see it at this site.

http://www.johnboren.com/html/c_eng...ket_glider.html


John Boren
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  #15  
Old 05-07-2011, 04:42 PM
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tbzep tbzep is offline
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Quote:
Originally Posted by JumpJet
The first thing I know I did wrong was to launch the model vertically.

The second thing I learn is that I probably should have NOT touched the controls on boost

Thirdly I will most likely need to put tons of expo on the elevator for boost


After reading the above three events, it sounded like a disaster in the making. It was good news to read the bright side....

Quote:
On the bright side even though both boost were far from straight up I got a 44 second flight on my first attempt and 57 seconds on the second attempt.
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  #16  
Old 05-09-2011, 02:16 PM
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kevinj kevinj is offline
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Dual rates, or better yet- a flight mode for boost and another one for glide.

From the video it looked like the model pitched up (on it's back) during boost, which to me seems to be an issue with not enough angle on the motor pod, or too much incidnece on the tail.

Unless that was the reaction to a downward pitch? Hard to tell.

One of the things that I've been taught to do with a new RCRG is to get it in the air (tow, catapult or DLG) and then set it in a dive. Trim the dive so the model doesn't try and pull out or tuck it's nose under, and that's your starting boost trim.

Scott and I managed to get our Vapor-brick controlled model to boost almost hands off (needed a little push over at burn out) on A and B motors. I think a C would have been too much for that little glider.

Let us know if you plan on making parts sets available. I'd certainly purchase one.

kj
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  #17  
Old 05-26-2011, 05:39 PM
jeffk813 jeffk813 is offline
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That's inspiring! I've actually got plans on my bench for an RC BG utilizing this system:



It's a Spektrum AR6400L receiver. 6-channels, two built-in linear servos, ESC (not utilized), measures roughly 1 inch square, and weighs in at 0.14 Oz. For power, it runs on a single-cell LiPo battery that is a quarter the size of the receiver and weighs only 0.15Oz

The only drawback is that it's made for the Spektrum 2.4GHz radio. Not a big deal for me as those are what I use in my RC helis and planes, but a suitable transmitter can be had for about 60 bucks. Less if you do your homework on eBay.

I wonder if one could be made small and light enough for mini motors?
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  #18  
Old 05-26-2011, 09:23 PM
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kevinj kevinj is offline
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Yes Jef. Several folks have made models with the spektrum bricks down to 1/8A.
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