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Old Apr 10, 2012, 11:41 AM
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Carl Petersen's Avatar
United States, AZ, Quartzsite
Joined Mar 2002
1,630 Posts
Quote:
Originally Posted by dbgood View Post
Ok so i ordered the omega 130g,870kv for my plane.
Also have a 11x8.5 apc prop,and on the motorcalc,it
says prop may stall
hope it will be fine..
DB
On a 4S battery you're going way over 700 watts. Make sure your battery and ESC are up to the task.

I fly mine with an 11x7 and it's still too fast. I'm going to try the 12x6 next, as Neil suggested.
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Old Apr 10, 2012, 09:37 PM
scratch-built
Jim Lee's Avatar
United States, WA, Port Orchard
Joined Apr 2007
999 Posts
Quote:
Originally Posted by dbgood View Post
Ok so i ordered the omega 130g,870kv for my plane.
Also have a 11x8.5 apc prop,and on the motorcalc,it
says prop may stall
hope it will be fine..
DB
dbgood, A motor calc is only an approximation, You really need a Watt Meter to get a good Idea of whats going on with your Motor, ESC and Battery.The Omega is rated for 50A max or 700 Watts in. You wouldn't get 700 Watts at the prop because none of the current crop of outrunners are 100% efficient. Most are about 80 to 85%

I figure about a thirty percent loss, But.that may be a little high. On my set-up I'm getting 630 Watts in so I subtract 30% to get the approximate watts to the prop. 630 - 30% = 441 Watts more or less. Thats still over 200 Watts per pound. That's in 3D range and the 47" Osiris with the throws set to the Max will 3D.

The 11x8.5e APC prop may be a bit too much, If you hook up a watt meter and you're drawing over 50A, Then you need to prop down in pitch.. Props that I have used on my Omega are the APC 11x7e, 11x8e and a Xoar 12x6. I settled on the 11x8e as it flew the Osiris the way I wanted it to fly.

Some talk about the speed being too fast and that's what the throttle is for, I very seldom use full throttle and I fly the AMA Advanced and the Masters Pattern Sequences. About the only time I use full poweer is in knife edge pulling the bottom of the figure M.

The Set-up in my 47" Osiris is
130g Omega 870Kv Motor
4s 30c 2650mAh Lipo
Cobra 60A ESC w/6.0v SBEC
11x8e APC Prop
Hyperion Atlas DS-11 AMB Digital Servos
I'm pulling 45A on the 11x8e prop 45x14= 630 Watts.

J
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Old Apr 10, 2012, 10:45 PM
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dbgood's Avatar
scotia ,NY
Joined Jul 2008
627 Posts
Quote:
Originally Posted by Jim Lee View Post
dbgood, A motor calc is only an approximation, You really need a Watt Meter to get a good Idea of whats going on with your Motor, ESC and Battery.The Omega is rated for 50A max or 700 Watts in. You wouldn't get 700 Watts at the prop because none of the current crop of outrunners are 100% efficient. Most are about 80 to 85%

I figure about a thirty percent loss, But.that may be a little high. On my set-up I'm getting 630 Watts in so I subtract 30% to get the approximate watts to the prop. 630 - 30% = 441 Watts more or less. Thats still over 200 Watts per pound. That's in 3D range and the 47" Osiris with the throws set to the Max will 3D.

The 11x8.5e APC prop may be a bit too much, If you hook up a watt meter and you're drawing over 50A, Then you need to prop down in pitch.. Props that I have used on my Omega are the APC 11x7e, 11x8e and a Xoar 12x6. I settled on the 11x8e as it flew the Osiris the way I wanted it to fly.

Some talk about the speed being too fast and that's what the throttle is for, I very seldom use full throttle and I fly the AMA Advanced and the Masters Pattern Sequences. About the only time I use full poweer is in knife edge pulling the bottom of the figure M.

The Set-up in my 47" Osiris is
130g Omega 870Kv Motor
4s 30c 2650mAh Lipo
Cobra 60A ESC w/6.0v SBEC
11x8e APC Prop
Hyperion Atlas DS-11 AMB Digital Servos
I'm pulling 45A on the 11x8e prop 45x14= 630 Watts.

J
Im not gonna beat up the motor that much with the 11x8.5Apc E prop,if it does pull more then 50 amps and 700 watts,
like you said thats what the throttle is for off,and on..
I do love speed though and i think the Osiris is gonna be a fast plane with my setup,i have a ICE 75,and a 4s,3300 mah ,but i'll get it to balance just fine.
I cant wait to build it its coming from Espirit models this thursday,plus i start my vacation that day...Cant wait to fly her!!
DB
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Old Apr 11, 2012, 12:18 AM
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Jim Lee's Avatar
United States, WA, Port Orchard
Joined Apr 2007
999 Posts
dbgood,
You're not going to believe how well the little Osiris flies.It's the best flying F3A pattern plane in it's class. Andrew hit it out of the park with this one.

J
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Old Apr 11, 2012, 07:21 AM
It's just a plane.
ZackJones's Avatar
USA, SC, Goose Creek
Joined Aug 2010
2,104 Posts
Quote:
Originally Posted by dbgood View Post
Ok so i ordered the omega 130g,870kv for my plane.
Also have a 11x8.5 apc prop,and on the motorcalc,it
says prop may stall
hope it will be fine..
DB
I flew mine with the 11x7 APC prop. I've seen other guys recommend 12x6 or ever 13x4 to slow her down a bit. You're gonna love it.
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Old Apr 11, 2012, 11:53 PM
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dbgood's Avatar
scotia ,NY
Joined Jul 2008
627 Posts
Omega 870kv

Hi Guys,
I just got in the Omega 130g,870 kv motor in today.
I have a question,how put a spinner on it?
It has the bolt on propadapter that comes with the motor.
I was also thinking of using a collet but it didnt screw in enough
to tighten up the prop to it..
Thanks,
DB
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Old Apr 12, 2012, 12:18 AM
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dbgood's Avatar
scotia ,NY
Joined Jul 2008
627 Posts
I just ordered a Extreme flight 40mm spinner from 3dhobbyshop,
i hope it fits on the Omega motor!!
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Old Apr 12, 2012, 12:34 AM
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Jim Lee's Avatar
United States, WA, Port Orchard
Joined Apr 2007
999 Posts
dbgood,
You shouldn't have any trouble putting a spinner on your Omega motor. I can show you a couple of photo's of mine with a 40mm Hyperion aeroSpinner on it'

http://www.rcdude.com/servlet/the-61...r--dsh-/Detail

J
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Old Apr 12, 2012, 12:35 AM
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Jim Lee's Avatar
United States, WA, Port Orchard
Joined Apr 2007
999 Posts
Oops, It looks like My Post was too late.

J
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Old Apr 12, 2012, 12:54 AM
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dbgood's Avatar
scotia ,NY
Joined Jul 2008
627 Posts
Quote:
Originally Posted by Jim Lee View Post
Oops, It looks like My Post was too late.

J
So mount the spinner on the bolt on prop adapter that came
with my Omega 870kv motor?
Thanks Jim
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Old Apr 12, 2012, 01:49 AM
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Jim Lee's Avatar
United States, WA, Port Orchard
Joined Apr 2007
999 Posts
Quote:
Originally Posted by dbgood View Post
So mount the spinner on the bolt on prop adapter that came
with my Omega 870kv motor?
Thanks Jim
dbgood, That would be a yes.

When you mount the cowl, You might have to inlarge the opening in the nose of the cowl with a Dremel drum sander or equivalent, As the prop adapter that bolts onto the Omega was larger then the cowl opening on my Osiris.

If you look at the photo that I posted, You can see the prop adapter sticking through the front of the cowl.

J
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Old Apr 12, 2012, 02:45 PM
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dbgood's Avatar
scotia ,NY
Joined Jul 2008
627 Posts
Quote:
Originally Posted by Jim Lee View Post
dbgood, That would be a yes.

When you mount the cowl, You might have to inlarge the opening in the nose of the cowl with a Dremel drum sander or equivalent, As the prop adapter that bolts onto the Omega was larger then the cowl opening on my Osiris.

If you look at the photo that I posted, You can see the prop adapter sticking through the front of the cowl.

J
I wonder if i can just fly the my new Osiris with the prop adapter,and
nut that came with my Omega 870 kv,hope it wont hit the cowl,
the spinner i ordered wont be here till tuesday,and i want to have it built
up and ready to fly this weekend!!
DB
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Old Apr 12, 2012, 02:46 PM
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scotia ,NY
Joined Jul 2008
627 Posts
Also looked all in the box and no instruction manual
with my kit ,already starting off bad
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Old Apr 12, 2012, 03:20 PM
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LanceMc's Avatar
Delta BC
Joined Jul 2008
356 Posts
Quote:
Originally Posted by dbgood View Post
I wonder if i can just fly the my new Osiris with the prop adapter,and
nut that came with my Omega 870 kv,hope it wont hit the cowl,
the spinner i ordered wont be here till tuesday,and i want to have it built
up and ready to fly this weekend!!
DB
^This is the way I built mine^.

Quote:
Originally Posted by dbgood View Post
Also looked all in the box and no instruction manual
with my kit ,already starting off bad
The manual can be found online here.
http://www.3dhobbyshop.com/assets/im...RIS-MANUAL.pdf

Lance
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Old Apr 12, 2012, 06:08 PM
Registered User
United States, CA, Sunnyvale
Joined Mar 2011
522 Posts
Quote:
Originally Posted by dbgood View Post
Also looked all in the box and no instruction manual
with my kit ,already starting off bad
Iirc there was a piece of paper that said the manual is available online. Or maybe it was on the box somewhere. Has been a while
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