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RE: Aurora 60 Build Thread - Electric Power - 4/20/2007 11:11 AM   
Eggert


 

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From: Slangerup, DENMARK
Status: offline 		Sorry if i'm not making myself clear ! That was not the intention. Flying outrunners demonstrates the peculiar phenomenon that the motor allways gives good performance on a plane that has a weight exactly 10 times the weight of the motor !

Example : Typical shock flyer and AXI 2204 54. Motor is 20 gramme and shockflyer is 200 gram including two 640 lipo cells. Gives good performance.
Flitons "Rogue" and AXI 2808. Motor is 76 gramme and the plane is ca 750 gramme with 3s 2100 cells. Also gives good performance
My own "Elaine" ( Search the electric pattern threads ) Cocaine with 553 gramme of Hyperion 4045 14 and 5400 gramme of model with 10 s Hyperion 5000 cells. Also has very good power. Funny, right ?

You should be able to put a much smaller motor, and benefit from the lower overall weight, on your Aurora. Something around 400 gramme would be fine !





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RE: Aurora 60 Build Thread - Electric Power - 4/21/2007 12:02 AM   
Bootalini


 

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Status: offline 		Eggert, I've got it now. You're probably right in that 1200ish watts might be plenty for this airplane (maybe comparable to having a traditional .60 up front?) but if I can get the advertised 1500-1600W out of this set-up, I'll take it even though I could maybe have saved a few ounces up front using a smaller motor. Better to over-do it than come up short....IMHO.

Jeff

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RE: Aurora 60 Build Thread - Electric Power - 4/21/2007 1:13 AM   
Eggert


 

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Status: offline 		I see your point, the plane will be ballistic, but you also have to consider power conservation i.e the length of flights. The smaller motor will make it easier to have long air time and the Aurora deserves to stay as long as possible in the sky .

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RE: Aurora 60 Build Thread - Electric Power - 4/22/2007 8:02 AM   
chronos333


 

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Status: offline 		For your information I tried the 13X13 today with a more rearward cg...
A lot less thrust but a lot more speed... I even had to reduce the throws...
Landing is also faster (less prop brake)
Snap are a lot more violent (cog)

This setup is running well believe me a 4035 would be pushed to its limits thus by putting 150g more of iron your are buying reliability.
Moreover the weight of the 4045 is exactly the same as a YS61

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RE: Aurora 60 Build Thread - Electric Power - 5/5/2007 3:56 AM   
danno-RCU


 

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Status: offline 		Hello Jeff,
Good to see you are back at it. Jess Desrosiers wants me to tell you he has an Aurora for sale if your interested. It was my last Aurora that I had started but never finished.
Have you flown yours yet?
Dan Venables

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RE: Aurora 60 Build Thread - Electric Power - 5/5/2007 9:09 AM   
Bootalini


 

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Status: offline 		Dan, PM sent.

Jeff

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RE: Aurora 60 Build Thread - Electric Power - 5/27/2007 2:59 AM   
Bootalini


 

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Status: offline 		It's been a while since my last post. To update eveyone, the entire aircraft has been glassed with multiple coats of Polycrylic applied. I've sanded a few areas just to get a feel for the Poly and it seems to sand just fine.

Unfortunately I have to stop there for a while as I'm moving back to Canada in about 3 weeks. I'm having to direct all my energy and attention preparing for the move so no modeling time! The good news is that generally speaking, the RC scene in Ottawa, Ontario (where I'm moving to) is good...the bad news is pattern in eastern Canada is in a bit of a lull. Anyhow, I expect to be back at it late in the summer and I'll continue to post my progress as I apply the finish to what I'm hoping will be a beauty.

Jeff

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RE: Aurora 60 Build Thread - Electric Power - 8/6/2007 7:20 PM   
Bootalini


 

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Status: offline 		These last 2 months for me have been spent moving to Ottawa, Canada. Now that the dust is settling, I'm continuing where I left off.

After installing all 3 retracts/wheels and assembling the airplane, I adjusted the nosewheel height to achieve an approximate zero degree wing incidence wrt the ground. After establishing this reference, I then proceeded to rough-in the nosegear retract cut-out in the belly pan.

It's good to be building again!!!

Jeff L

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RE: Aurora 60 Build Thread - Electric Power - 8/6/2007 7:27 PM   
Atlanta 60



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Status: offline 		Excellant!!

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RE: Aurora 60 Build Thread - Electric Power - 8/6/2007 7:55 PM   
mmattockx


 

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quote:

ORIGINAL: Bootalini
I then proceeded to rough-in the nosegear retract cut-out in the belly pan.


Does anyone else think that may be the nicest job of "roughing in" a cut out ever? There are a lot of guys in the gas forum that can't FINISH their ARF cowls that nicely. Beautiful work, Jeff.

Welcome back.

Mark

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RE: Aurora 60 Build Thread - Electric Power - 8/6/2007 9:58 PM   
Nathan King



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quote:

ORIGINAL: mmattockx


quote:

ORIGINAL: Bootalini
I then proceeded to rough-in the nosegear retract cut-out in the belly pan.


Does anyone else think that may be the nicest job of "roughing in" a cut out ever? There are a lot of guys in the gas forum that can't FINISH their ARF cowls that nicely. Beautiful work, Jeff.

Welcome back.

Mark


I second that!! That looks as good as my finish jobs.

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RE: Aurora 60 Build Thread - Electric Power - 8/7/2007 12:03 AM   
Atlanta 60



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quote:

ORIGINAL: Nathan King


quote:

ORIGINAL: mmattockx


quote:

ORIGINAL: Bootalini
I then proceeded to rough-in the nosegear retract cut-out in the belly pan.


Does anyone else think that may be the nicest job of "roughing in" a cut out ever? There are a lot of guys in the gas forum that can't FINISH their ARF cowls that nicely. Beautiful work, Jeff.

Welcome back.

Mark


I second that!! That looks as good as my finish jobs.


I think he "Photo Shopped" it...Have you seen what they can do for magazine models with photoshop?? Yeah...He must have doctored the pic...lol (JK!!!!!)

We have CNC Machined parts at work that don't look that good!!

Glad your back at it!!

Have Fun...

Chuck

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RE: Aurora 60 Build Thread - Electric Power - 8/7/2007 12:50 AM   
Bootalini


 

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Status: offline 		http://www.youtube.com/watch?v=0VOiPiwFmTE

A video from a fellow in Montreal (Chronos 333) flying an Aurora with the identical electric set-up that I'll be using. No lack of power there!!!

Jeff

< Message edited by Bootalini -- 8/7/2007 12:52 AM >

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RE: Aurora 60 Build Thread - Electric Power - 8/7/2007 1:47 AM   
Nathan King



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Status: offline 		I've never heard an electric setup sound like that before. We have a few guys with electric 2x2 pattern ships that are almost as quiet as a foamy.

That's a pretty rough landing area. I wouldn't think those gear would hold up well over time. All he needs to do now is to actually fly pattern!!

It doesn't seem to need more power though.

< Message edited by Nathan King -- 8/7/2007 1:49 AM >

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RE: Aurora 60 Build Thread - Electric Power - 8/7/2007 4:23 AM   
Atlanta 60



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Status: offline 		That almost sounds like a piped engine...lol...Kinda suprising...

Defiantly no lack of power!! Very Kewl!!

Have Fun...

Chuck

< Message edited by navav2002 -- 8/7/2007 4:24 AM >

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RE: Aurora 60 Build Thread - Electric Power - 8/7/2007 4:54 AM   
chronos333


 

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Status: offline 		Hi guys,

Cool you like it, love its sound... that's all prop noise and wood resonance. A sheated wing won't make as much noise...

The grass is a bit long at our field, I may change field for saving my retracts...
If you look carefuly, Iam not that rough with my dear, the field IS!

If you think my Erora is overpowered, look at this:
http://www.youtube.com/watch?v=tHmyHKZ_eUc


To me my erora has just enough power. the 14X12 eprop was cool (lots of thrust, less amps)... but I really like the speed of the 13X13. If we were flying on a paved runway I would put the 14X12e back...
The 14X14 glow prop was INSANE... like the bart hotliner in a way...

See ya


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RE: Aurora 60 Build Thread - Electric Power - 8/7/2007 5:26 AM   
chronos333


 

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Status: offline 		I forgot to mention, before playing the 2nd vid, crank up your speakers so you can hear the noise during the dives.
It is trully addictive

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RE: Aurora 60 Build Thread - Electric Power - 8/7/2007 5:27 AM   
Nathan King



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quote:

ORIGINAL: chronos333

The grass is a bit long at our field, I may change field for saving my retracts...
If you look carefuly, Iam not that rough with my dear, the field IS!



I agree that your landing was fine, the grass is just long. That model has a lot of energy to dissipate when landing, and as you know, the faster you dissipate energy the more stress you put on the model. I'm actually a bit surprised that they don't get damaged since I've had a few airplanes that would have required repair after something like that.

What method do you use to mount your retracts? It's nice and sturdy.

EDIT: WOW that is a cool sound in the dives!!

< Message edited by Nathan King -- 8/7/2007 5:28 AM >

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RE: Aurora 60 Build Thread - Electric Power - 8/7/2007 5:48 AM   
chronos333


 

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Status: offline 		The lg mounts: It'a a secret method held by the one who fly bad like me (aka who don't fly pattern )!
14X12 had a far better prop brake, I was able to land a lot slower with it... when it was glow the 11X12W was stressful to land... 1991 I was 12 yrs old at the time ... the paved runway was less than 150ftX12ft ... surrounded by grapes... had to land engine cut to come in slow enough everytime.
My new cg (1st flight with a rx battery in the tail on the vid) is too rearward:
- stall turns are next to impossible (they usually are my fav as I do them in less than 1/2 wingspan diameter without engine help ... I am no cheater)
- snaps give you 3/4 turn for free and are really nasty (check them out on the vid they are really really nasty)
- plane is twitchy and laterally unstable (as you can see from the way I correct it with the ailerons)
Yet I still lack ailerons throws, 4 pointers have to be with the stick in the corner!
Yes I don't fly pattern anymore, competition brought all the fun out of the hobby when I was young.
Now I fly the way I like, the way I feel.

< Message edited by chronos333 -- 8/9/2007 4:49 AM >

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RE: Aurora 60 Build Thread - Electric Power - 8/12/2007 3:52 AM   
chronos333


 

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Status: offline 		Hi guys,

2 flight today.
First flight, loss of power after 6min30
Second flight, not much power after 2min and no more after 4 min
Charged them back at home @ 0.5C = 2200mah (they were 3700mah originally)
So I guess my lipos are officialy DEAD!

They didn't last the advertised 200 cycles (in fact I am closer to 70 cycles)
They survived a fire (when the esc caught fire last year) and 1 deep discharge (cell balooned slightly but came back to normal) over 2 years.They were always carefuly balanced and discharged to 80% not more. Another mistake I did with them is to store them fully charged during the winter, consequently they developped higher IR and started to heat a bit more.

Chronos

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RE: Aurora 60 Build Thread - Electric Power - 8/12/2007 5:51 AM   
Nathan King



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Status: offline 		That set of mistakes is enough to kill the batteries after less than half of their rated lifetime.

Store at 3.8 Volts per cell.

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RE: Aurora 60 Build Thread - Electric Power - 8/12/2007 7:41 PM   
chronos333


 

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RE: Aurora 60 Build Thread - Electric Power - 8/12/2007 7:42 PM   
chronos333


 

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Status: offline 		I may change to a 9S setup and a 12X12 (a la red head OS61 H prettner edition...)

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RE: Aurora 60 Build Thread - Electric Power - 8/14/2007 12:26 AM   
chronos333


 

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Status: offline 		... but I will lower the amp draw to keep the same power to weight ratio (which is enough to me)

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RE: Aurora 60 Build Thread - Electric Power - 11/11/2007 4:13 PM   
Bootalini


 

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Status: offline 		For those wondering, I've not completely abandoned my project. Work and other competing interests have made it difficult. The radio installation and retract rigging is pretty much done and I'll be taking everything out soon so I can continue with applying the finish. I anticipate good progress between now and the end of the X-Mas holiday.

As an aside, any of you following the indoor pattern F3P stuff?.....it looks plenty challenging and fun. I just purchased a 'Clik' pattern foamy and will be flying this winter with the indoor crowd here in Ottawa.

Jeff

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