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Old Dec 12, 2006, 03:51 PM
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What do you think of this setup?


Motor: Mega ACn 16-25-3; 1700rpm/V; 1.9A no-load; 0.017 Ohms.
Battery: Sanyo CP-1700SCR; 12 cells; 1700mAh @ 1.2V; 0.0055 Ohms/cell.
Speed Control: Generic Brushless ESC; 0.006 Ohms; High rate.
Drive System: SKYCAT; 12x8 (Pconst=1.08; Tconst=1) geared 2.3:1 (Eff=95%).
Airframe: SKYCAT; 558sq.in; 53.3oz; 13.7oz/sq.ft; Cd=0.043; Cl=0.06; Clopt=0.39; Clmax=0.89.
Filter: 80% min efficiency.
Stats: 121 W/lb in; 102 W/lb out; 22mph stall; 33mph opt @ 60% (16:31, 109F); 88mph level; 1989ft/min @ 42.9; -510ft/min @ -10.

Now as you can see this was for my skycat....it was a pig...and this setup made it fly very nice...just almost hover.

This time I will use lipos..any thoughts?
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Old Dec 12, 2006, 05:55 PM
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Airdrie, AB Canada
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Motor is about the right weight. (110g) You still have to add a gearbox on that, but should be in the ball park.

According to motocalc that rig is pulling 400w or so (121w/lb*3.3). That is also right in the ball park. But you have 14v using 12 cells. Closer to 4s than 3s.

Effective KV geared 2.3:1 is 739. The 800KV motors do very nicely in this plane on 3s and a 12x6 or 13x6.5 ... The slightly lower kv and a 12x8 should be fine and put you squarely in the 350-400w range.

Passes the quick and dirty sanity check for me. Don't know how much of a pain it will be to mount. But it should balance and work fine. Wouldn't be my choice but if it's there... why not? Should be much nicer on a 33oz plane than 50oz.

Mike
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Old Dec 12, 2006, 06:25 PM
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Would the E-flite 480 work for this plane?
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Old Dec 12, 2006, 08:21 PM
Fly Fly Fly Crash
Dragon 2's Avatar
Montrose Co
Joined Aug 2005
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trexflyr

If your talking about the 480 bl outrunner, I think it will be to small. that motor is for 3D planes from 550 to 850 grams and the acro master comes in around 1100 grams. The Himax 3516/1130 is what is recommended
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Old Dec 12, 2006, 09:51 PM
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Airdrie, AB Canada
Joined Sep 2004
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The Power 10 is almost identical to the recommended system. The 480 is a little small, but it will certainly get it up in the air. Lots of 30oz planes i.e Brio flying on it.
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Old Dec 13, 2006, 09:12 AM
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Wheaton, IL
Joined Nov 2004
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How well will a Mega RC600/20/8 work on the AM? It's an 885 rpm/v outrunner that weighs 4.7oz 136g. It runs about 350 watts.

http://www.megamotorusa.com/Brushles...Cn600-20-8.htm

How would this compare to the best motors out there, the Torque and maybe Hyperion and HiMaxx?
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Old Dec 13, 2006, 03:57 PM
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Quote:
Originally Posted by mjws
Motor is about the right weight. (110g) You still have to add a gearbox on that, but should be in the ball park.

According to motocalc that rig is pulling 400w or so (121w/lb*3.3). That is also right in the ball park. But you have 14v using 12 cells. Closer to 4s than 3s.

Effective KV geared 2.3:1 is 739. The 800KV motors do very nicely in this plane on 3s and a 12x6 or 13x6.5 ... The slightly lower kv and a 12x8 should be fine and put you squarely in the 350-400w range.

Passes the quick and dirty sanity check for me. Don't know how much of a pain it will be to mount. But it should balance and work fine. Wouldn't be my choice but if it's there... why not? Should be much nicer on a 33oz plane than 50oz.

Mike
*I ran the motocalc number last night when I got home..if I did it right this setup (which is already sitting waiting for a plane) with an 11x5.5 prop on 3s or 4s will out perform the recommended Himax motor (higher output watts/lb).

The only problem I have is (as you mentioned) I dont know how easy it will be to mount up the superbox (http://www.modelelectronicscorp.com/.../superbox.html) to the motor mount.
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Last edited by Lightnin; Dec 13, 2006 at 04:03 PM.
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Old Dec 13, 2006, 04:06 PM
How low can you Go??
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England
Joined May 2004
94 Posts
Hi guys, just finished painting my acromaster, hopefully get her in the air in the next week or so.
a few pics.

Cheers
Simon
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Old Dec 13, 2006, 04:15 PM
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Nice Paint Job.
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Old Dec 13, 2006, 04:36 PM
AMA 506547
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United States, CA, North Highlands
Joined Sep 2004
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Very nice! Me likie
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Old Dec 13, 2006, 06:35 PM
'FPV'er...not a "LOS'er
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Las Vegas, NV
Joined Sep 2003
18,389 Posts
Love the 'star bursts' on the canopy. What kind of paint did you use and how well does/is it sticking?
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Old Dec 13, 2006, 07:25 PM
How low can you Go??
simon 3D's Avatar
England
Joined May 2004
94 Posts
The paint i am using is AutoAir colours from createx, they are superb!, i gave the model a rub down with fine wet and dry, to get a good key, and the paint went on well, must be carefull when masking over painted surface as anything other than ultra lowtac tape will fetch off the colour.

Cheers
Simon
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Old Dec 14, 2006, 12:45 AM
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Chino Hills, CA
Joined Jan 2005
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simon 3D,
That work is superb. Only You and Blucor seem to know what's up with this foam. Mine is all white with black canopy. Easy to see, but not a justified look for our birds of paradise. Maybe I can get my neighbor to spray her up....
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Old Dec 14, 2006, 01:09 AM
SD_Raptor
San Deigo, CA
Joined Mar 2006
685 Posts
Quote:
Originally Posted by punkindrublik
Yeah, stay away from epoxy...

Brian
I have used epoxy for repairs and mods on my Magister with no problems. The trick is to properly prepare the surfaces - sand them with 300 grit to get a nice 'suede' finish and the epoxy adheres perfectly well. If something breaks there again, the epoxy will bring only a layer of elepor beads with it.

I have now decided to do more than reinforce, I am going to glass the nose with two plies of very lightweight fiberglass and use finishing resin. A test on an old piece of a 'boneyard' Magister gives excellent results. The finishing resin is a polyimide that will remain slightly flexible but with very high shear strength, complimenting the glass which adds high tensile strength. Very thin CF cloth would also work but I do not have any and it is a bit more tricky to work. The glass is nearly transparent and hides mistake much more easily - if you goof with CF, everyone can see your incomptence.

Once I have the nose glassed, I will begin applying the metallic iron-on covering. I have red, green, blue, purple and white to play with. Since I have zero artistic abilities, I probably won't post any pics (unless by some miracle it looks really nice).

Randy
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Old Dec 14, 2006, 12:12 PM
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Portugal
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...
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Last edited by jalves; Dec 16, 2006 at 12:24 PM.
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