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RE: Aurora 60 Build Thread - Electric Power - 2/7/2007 5:28:54 PM   
Trisquire


 

Posts: 339
Joined: 1/13/2005
From: Columbus, OH, USA
Status: offline 		Would A123 cells have adequate discharge rates for this type of plane?

Tom

(in reply to rainedave)
       Post #: 101

RE: Aurora 60 Build Thread - Electric Power - 2/8/2007 12:51:45 PM   
chronos333


 

Posts: 26
Joined: 10/8/2004
From: longueuil, QC, CANADA
Status: offline 		A123's voltage drop is too important above 40amps to be useable.
You have to run them 9or10S2P which almost equates nimh's weight!

(in reply to Trisquire)
       Post #: 102

RE: Aurora 60 Build Thread - Electric Power - 2/8/2007 5:07:07 PM   
Trisquire


 

Posts: 339
Joined: 1/13/2005
From: Columbus, OH, USA
Status: offline 		It might equate nimh's weight, but the flights would be a lot longer than nimh.

Tom

(in reply to chronos333)
       Post #: 103

RE: Aurora 60 Build Thread - Electric Power - 2/8/2007 5:59:43 PM   
rainedave



Posts: 5200
Joined: 7/21/2005
From: Greensboro, NC, USA
Status: online 		From the little I've read about A123 cells, their advantage lies in the fact that they can tolerate higher charge rates. The recommended safe rate for the average lipo is a 1C charge rate. A123s can supposedly be charged safely at 2C or higher, if I'm not mistaken. Ounce for ounce they have a lot more capacity than NiMHs but a bit less than lipos, so it's the higher charge rates that make them attractive compared to lipos.

< Message edited by rainedave -- 2/8/2007 6:00:51 PM >

(in reply to Trisquire)
       Post #: 104

RE: Aurora 60 Build Thread - Electric Power - 2/8/2007 7:08:03 PM   
chronos333


 

Posts: 26
Joined: 10/8/2004
From: longueuil, QC, CANADA
Status: offline 		But weight/performance wise, nothing beats the lipo these days.
I hope it will change

(in reply to rainedave)
       Post #: 105

RE: Aurora 60 Build Thread - Electric Power - 2/8/2007 7:49:54 PM   
Trisquire


 

Posts: 339
Joined: 1/13/2005
From: Columbus, OH, USA
Status: offline
quote:

ORIGINAL: rainedave

................it's the higher charge rates that make them attractive compared to lipos.


And the price.

Tom

(in reply to rainedave)
       Post #: 106

RE: Aurora 60 Build Thread - Electric Power - 2/9/2007 12:56:26 PM   
chronos333


 

Posts: 26
Joined: 10/8/2004
From: longueuil, QC, CANADA
Status: offline 		And most of all safety...

(in reply to Trisquire)
       Post #: 107

RE: Aurora 60 Build Thread - Electric Power - 2/10/2007 4:40:28 AM   
can773



Posts: 1655
Joined: 1/25/2002
From: Calgary, AB, CANADA
Status: offline 		Re: Power Supplies,

There is not much that can beat the Iota DLS-55, 740W for $100ish US. A single supply can handle two 10s packs at 5A and a third at 4A. The 55A is probably overkill, but they also do a 30A and 45A.

Plus it doubles as a very good charger for the 12V batteries if you charge at the field



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Chad Northeast

(in reply to chronos333)
       Post #: 108

RE: Aurora 60 Build Thread - Electric Power - 2/10/2007 2:06:41 PM   
chronos333


 

Posts: 26
Joined: 10/8/2004
From: longueuil, QC, CANADA
Status: offline 		that's right, but a coswell PS @ 15$ ain't bad either

(in reply to can773)
       Post #: 109

RE: Aurora 60 Build Thread - Electric Power - 2/12/2007 4:24:37 AM   
Bootalini


 

Posts: 147
Joined: 9/5/2006
From: Ottawa, ON, CANADA
Status: offline 		Well, it was back to the wings this weekend. A busy couple of days but I still managed about 3 hours of 'model' time which was enough to cut the ailerons out of the wings, cap and hinge them to the wing panels and then sand everything flush. As per the stab halves I used 1/4" balsa to cap the wing portion just ahead of the aileron and 1/2" to cap the front of the aileron itself. The 1/2" wood ensures a lot of area remaining after beveling the ailerons and provides a good anchor for the aileron horns.

Next on the 'to-do' list is to cut the tips and tack glue them into place. I'll then carve them and sand to a rough finish before I break them off so I can hollow them out.



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Jeff L

(in reply to chronos333)
       Post #: 110

RE: Aurora 60 Build Thread - Electric Power - 2/23/2007 6:27:23 AM   
Atlanta 60



Posts: 1084
Joined: 2/15/2003
From: Cartersville, GA, USA
Status: offline 		Bump...

How's it Going?? Hope all is Well!!

Chuck

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"A Superior Pilot uses his Superior Judgment to avoid using his Superior Skills." - astronaut Frank Borman

(in reply to Bootalini)
       Post #: 111

RE: Aurora 60 Build Thread - Electric Power - 3/10/2007 9:57:25 PM   
Bootalini


 

Posts: 147
Joined: 9/5/2006
From: Ottawa, ON, CANADA
Status: offline 		I'ts been a while since I last posted. I've had a lot on the go lately.

As you can see in the 1 photo, I now have 2 cowlings which are lighter and a better quality than the original MK product. Anyone seeking additional info on this can PM me.

Wings are nearing completion with only the wheel wells and servo bays to be trimmed. Next on the list is attaching the new cowl and shaping the lower fuselage. I'll soon be ready to start applying the 1/2oz cloth. I'm going to use MinnWax Polycrylic to apply the cloth and and the same with corn starch to fill the weave. For paint, I've pretty much decided on Auto-Air water based paints for the color coats and I'll use a standard automotive clear to seal the whole mess . Anyone have recomendations on what I should use as a first coat on the bare wood as a sealer before I apply the cloth and water based Polycrylic??? Dope maybe?

I'm also in the process of designing a new motor mount which PTXMan will fabricate for me. The mount supplied with the motor package is quite good but it's "X" shape centers on the back of the motor which would normally be fine for most airplanes. The issue with the Aurora is that it was designed for beam mounts and as such it has a minimalistic firewall. Two of the mounting points on the Hyperion aluminum mount would be left hanging with nowhere to attach to. My solution is a larger rectangular mount with the holes for the motor bolts being offset as required. Anyway, have a look at the attached photo and it will become clear. The stock mount is next to the draft CAD drawing for reference.

Jeff L

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Jeff L

(in reply to Atlanta 60)
       Post #: 112

RE: Aurora 60 Build Thread - Electric Power - 3/10/2007 10:25:58 PM   
Atlanta 60



Posts: 1084
Joined: 2/15/2003
From: Cartersville, GA, USA
Status: offline 		Woot!! Your going again!! Great!! Looking Good!!

Chuck

_____________________________

"A Superior Pilot uses his Superior Judgment to avoid using his Superior Skills." - astronaut Frank Borman

(in reply to Bootalini)
       Post #: 113

RE: Aurora 60 Build Thread - Electric Power - 3/11/2007 3:39:05 AM   
mmattockx


 

Posts: 2205
Joined: 4/28/2005
From: Calgary, AB, CANADA
Status: online
quote:

ORIGINAL: Bootalini
Wings are nearing completion with only the wheel wells and servo bays to be trimmed. Next on the list is attaching the new cowl and shaping the lower fuselage. I'll soon be ready to start applying the 1/2oz cloth. I'm going to use MinnWax Polycrylic to apply the cloth and and the same with corn starch to fill the weave. For paint, I've pretty much decided on Auto-Air water based paints for the color coats and I'll use a standard automotive clear to seal the whole mess . Anyone have recomendations on what I should use as a first coat on the bare wood as a sealer before I apply the cloth and water based Polycrylic??? Dope maybe?

Jeff L


Jeff,

Good to see you back on the Aurora project... I have no first hand experience with the PolyC (yet), but I am planning on using it for a number of upcoming builds, so I have been researching and paying attention to posts about it. A number of people have used Deft sealer with good results and it seems any laquer based sealer works OK. At least one person used nitrate dope with good results as well. You must use something before the PolyC or the wood will warp and swell because of the water base.

Mark

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Waco Brotherhood #4

(in reply to Bootalini)
       Post #: 114

RE: Aurora 60 Build Thread - Electric Power - 3/26/2007 3:16:37 AM   
Bootalini


 

Posts: 147
Joined: 9/5/2006
From: Ottawa, ON, CANADA
Status: offline 		It's been a while since my last post but I had some time this weekend to hit the shop and get going again. PTX Man and I spoke about a week ago ref fancy motor mounts and the problem (in this case) of access to the upper 2 bolts. The front of the motor has a rather large flat area which makes getting at some of the motor mounting bolts very difficult. In the end, I decided to scrap the elaborate plan and go with the very simple solution of building a second firewall and positioning it forward so that it sat 1/4" behind the motor which minimized the length of any mounting pillars while allowing some air flow between the mount and motor for cooling purposes. See the photos....all will be clear.

After fabricating the second firewall and trimming it to size, I once again mounted/suspended the motor and spinner from the fuselage nosering which provided the required alignment and thrust angle. I then nudged the firewall (from behind the motor) up against the X shaped aluminum mount and then bolted everything together. I tacked the firewall to the fuse sides with a few drops of Zap and then pulled the motor out. After that, I re-mounted the motor to the new firewall as per normal (not using the fuse nosering). This was to double-check that the firewall positioning was in fact good.....funny how I've learned to double and triple check things!! Anyhow, all works well with the motor being able to be dropped-in and mounted quickly and easily.

Check out those MK Magic 60 plans I got from Willy. Might be my next project using my YS .61RE......hmmmmmm. Thanks Will!

Jeff

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Jeff L

(in reply to mmattockx)
       Post #: 115