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Author Topic: Another electric success story  (Read 7940 times)

Online Crist Rigotti

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Re: Another electric success story
« Reply #50 on: September 07, 2009, 08:56:11 PM »
I was just about to ask how did you do.  You did well.  1st time in advanced and you placed about mid field is very good.
Crist
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Offline Archie Adamisin

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Re: Another electric success story
« Reply #51 on: September 08, 2009, 08:25:34 AM »
Jason,

Great job on the 5th place.  The great thing about ECL is that you can concentrate more on flying than worrying about your set-up as it will continue to run consistent.  Just keep practicing and take care of that pretty airplane!!

Archie Adamisin
Muncie, Indiana
Archie Adamisin
Burlington, KY

Offline Jason Greer

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Re: Another electric success story (phoenix ice log file added)
« Reply #52 on: November 04, 2009, 10:22:47 AM »
Guys,

I've installed a Phoenix Ice 50 in my model and here is a screen shot of the first full pattern.  I replaced the 12x6 with a 12x4.5 pusher(13x4.5 cut down).  RPM is set at 9400.  I also went to 60' .015 braided instead of the 64' x .012 solids I was using.  Solids are too much of a headache...Lap times are still around 5.3 seconds.

After one flight, i'm pretty happy with the results.  

The Ice 50 is a bit of overkill.  The phoenix 35 will go back into this model and the Ice 50 will go into my new model that will be larger, heavier, and significantly more power.

Jason
El Dorado, AR
AMA 518858

Alan Hahn

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Re: Another electric success story
« Reply #53 on: November 04, 2009, 11:07:43 AM »
Interesting that you are getting ~90% of max available power in the peaks near the end of the flight.

I see you are starting out at ~70% in level flight and ending up at ~86% in level at the end.

Offline Jason Greer

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Re: Another electric success story
« Reply #54 on: November 04, 2009, 11:51:10 AM »
I found that interesting too.  Have you analyzed the throttle percentage on any of your electric models to see how much increase you get through the flight? 

Jason
El Dorado, AR
AMA 518858

Alan Hahn

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Re: Another electric success story
« Reply #55 on: November 04, 2009, 12:04:50 PM »
I found that interesting too.  Have you analyzed the throttle percentage on any of your electric models to see how much increase you get through the flight? 

Jason

No,
I haven't even soldered the connectors on my ICE50 lite yet!

I would think you are pretty optimized right now. The question (for me too) is how long the current battery can hold that curve. Once you hit 100%, that battery becomes a practice battery at best, or fodder for a RC plane!

Alan

Offline Igor Burger

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Re: Another electric success story
« Reply #56 on: November 04, 2009, 12:10:28 PM »
depends what is written on that battery ... 3.7V or 3.3V  VD~

Offline Jason Greer

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Re: Another electric success story
« Reply #57 on: November 04, 2009, 12:14:08 PM »
Have you weighed your 50 lite yet?  I got the hv 50 for the heatsink.  Probably totally unnecessary, but I just feel better having it.  The hv 50 weighs 60 grams which is a little heavier than I had hoped for.
El Dorado, AR
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Alan Hahn

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Re: Another electric success story
« Reply #58 on: November 04, 2009, 12:48:09 PM »
Jason,
Actually I haven't weighed it either. The lite is definitely heaver than my Phoenix 45 for example.  A lot of the weight is in the heavy gauge wires, so I am thinking about shortening them where it is possible. I usually don't need that length on the ESC-Motor side, but usually do use all I can get for the ESC-battery--mainly because I install a break in one side and put a bullet connector to act as an arming switch.

I didn't realize until I got it that a lot of the physical size is due to the BEC and its heatsink---even in the lite. Then I understood why the lite version only goes to 6s and the normal "big" heatsink version goes to 8s--it is just that the BEC has better cooling with the big heatsink which it needs to deal with the higher voltage on the 8s version. Of course we could almost care less in CL since we only need a little for out timers.

On the other hand, if we start putting in g-sensors and onboard computing power to handle the calculations for the vertical loads and the wind, maybe we will give the BEC a better workout! S?P

Offline Jason Greer

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Re: Another electric success story
« Reply #59 on: November 06, 2009, 12:43:12 PM »
Here is a new log file from today.  I went back to the 12x6 tractor at 8400 rpm and 64' .015 stranded lines.  This combo seems to perform better than the 12x4.5 pusher on 60' lines.  Both setups are setup to fly at 5.3 second laps, but I think the higher flying speed of the longer lines seems to help.  Line tension is definately better.  Winds were about 7 mph.  You can really see the fluctuation of the motor power going into and with the wind.
El Dorado, AR
AMA 518858

Online Dennis Adamisin

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Re: Another electric success story
« Reply #60 on: November 06, 2009, 04:14:47 PM »
5.3 sec on 64' line will out perform 5.3 on 60' every time - the higher airpseed and "bigger sky" really help.  The 4.5" pitch prop is going to have to run about 1300-1500 RPM faster than the 6" pitch to generate the same airspeed. 
Denny Adamisin
Fort Wayne, IN

As I've grown older, I've learned that pleasing everyone is impossible, but pissing everyone off is a piece of cake!

Offline Jason Greer

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Re: Another electric success story
« Reply #61 on: November 10, 2009, 02:06:38 PM »
Dennis,

I agree, a faster flying model on longer lines just seems to be a little more predictable also.  The reason I went back to the 12x6 was I just didnt have the throttle headroom to jack the rpm up much higher without running out of power towards the end of the flight.  After looking at the log files with the ice controller I found I was up around 93% with the 12x4.5 at 9500 rpm at the the end of the flight.  The 12x6 keeps me under 90% throughout the flight. 

On another note, the Omega won first place in advanced in its second outing this past weekend. 

Jason
El Dorado, AR
AMA 518858

Online Dennis Adamisin

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Re: Another electric success story
« Reply #62 on: November 10, 2009, 02:18:11 PM »
On another note, the Omega won first place in advanced in its second outing this past weekend. 

Jason

2 words: YEE HAW!  WTG Jason!   H^^  8)
Denny Adamisin
Fort Wayne, IN

As I've grown older, I've learned that pleasing everyone is impossible, but pissing everyone off is a piece of cake!

Offline Dean Pappas

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Re: Another electric success story
« Reply #63 on: November 10, 2009, 04:37:02 PM »
Hi All,
Yup, nothing beats having headroom: a 6" pitch prop on a motor with a 900 Kv (890 maybe?) and a 4S battery still gets to peaks of 90% throttle near the end of the flight on moderately long lines. A 1200 or 1300 Kv would be fine for a larger 4S set up with the 4-1/2" pitch.

That's what I think,
Dean
Dean Pappas

Online Crist Rigotti

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Re: Another electric success story
« Reply #64 on: November 10, 2009, 04:42:40 PM »
Well done Jason!
Crist
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Waxahachie, TX
Electric - The Future of Old Time Stunt

Offline Jason Greer

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Re: Another electric success story
« Reply #65 on: November 11, 2009, 06:46:24 AM »
Thanks guys!
El Dorado, AR
AMA 518858


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