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Old Aug 24, 2012, 11:17 AM
You down with EPP?
johnnyrocco123's Avatar
Houston, Tx
Joined May 2009
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What would you guys say is the best Neu/28mm/4S motor for a Viper????


1115/1y ??
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Old Aug 24, 2012, 12:36 PM
making my own planes...
decones's Avatar
Curitiba - Brazil
Joined Oct 2007
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Quote:
Originally Posted by johnnyrocco123 View Post
What would you guys say is the best Neu/28mm/4S motor for a Viper????


1115/1y ??
4S I would say 1115/1.5D
5S would be around 1115/2D and 1115/1Y
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Old Aug 24, 2012, 01:13 PM
Livin it UP when Im goin DOWN
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Norway, Telemark, Skien
Joined Feb 2010
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Originally Posted by decones View Post
4S I would say 1115/1.5D
5S would be around 1115/2D and 1115/1Y
Which props would you choose for those motors and cells?
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Old Aug 24, 2012, 01:27 PM
making my own planes...
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Curitiba - Brazil
Joined Oct 2007
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Quote:
Originally Posted by decones View Post
4S I would say 1115/1.5D
5S would be around 1115/2D and 1115/1Y
Quote:
Originally Posted by Arcteryxxx View Post
Which props would you choose for those motors and cells?
I would start with APC 4.7x4.7 and check the amps, temps, etc
if you have good cooling on motor you can MAYBE go at 5.2x5.2 graupner

I will start running my 1115/2D - 2600KV using 4.7x4.7 on 5S, unfortunately I don't have unilog and my esc nis not the logging version, will reamin in the "thinkable" area

What I already run was 1112/1.5Y - 2350kv on 5S and 5.2x5.2 prop, the result is very good as well the speed
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Old Aug 24, 2012, 06:45 PM
You down with EPP?
johnnyrocco123's Avatar
Houston, Tx
Joined May 2009
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Quote:
Originally Posted by decones View Post
4S I would say 1115/1.5D
5S would be around 1115/2D and 1115/1Y
4.7x4.7 on 4S 3500kv. Isn't that a bit much in an airframe that gets very little airflow? Especially when others are running 5s/2100kv with 5x5. Wouldn't you want more prop diameter on this size model? 5.25in?

I am just trying to understand, not arguing.
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Old Aug 24, 2012, 08:16 PM
making my own planes...
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Curitiba - Brazil
Joined Oct 2007
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Quote:
Originally Posted by johnnyrocco123 View Post
4.7x4.7 on 4S 3500kv. Isn't that a bit much in an airframe that gets very little airflow? Especially when others are running 5s/2100kv with 5x5. Wouldn't you want more prop diameter on this size model? 5.25in?

I am just trying to understand, not arguing.
lot of guys use mega 16/35/1 - 3600KV on 4S and 4.7x4.7 gives 300km/h,
others use range of 2300KV to 2800KV on 5S and same 4.7x4.7 or big depending what KV did you choose.
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Old Aug 25, 2012, 02:22 AM
"The Judge"
sebbe's Avatar
Sweden
Joined Feb 2006
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I would say mega 16/35/1 on 4s with 4.75x4.75 prop gives 200mph, not 300km/h

As always, cooling is important, and is depending even more if you fly WOT all the time...at least for the motor..
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Old Aug 25, 2012, 05:34 AM
Speed Demon
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Antioch,CA,USA
Joined Dec 1999
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Originally Posted by sebbe View Post
.......
As always, cooling is important, and is depending even more if you fly WOT all the time...at least for the motor..

..... and if not using WOT all the time the cooling is then needed for the ESC.
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Old Aug 25, 2012, 04:38 PM
You down with EPP?
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Houston, Tx
Joined May 2009
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Originally Posted by GregG View Post
..... and if not using WOT all the time the cooling is then needed for the ESC.
I like to do 30 sec. WOT runs and then kill motor for 20 sec. REpeat until my timer gets to 2:30 or 3 min.


I do have two cooling holes carved into my nose like KRProton's, but not sure that that is enough. These motors get hot ..in Texas
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Old Aug 26, 2012, 07:05 PM
You down with EPP?
johnnyrocco123's Avatar
Houston, Tx
Joined May 2009
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I would love to prop up and increase the speed on my Viper. It's a dog with the current setup Neu 1115/2.5D APC 5x5, 4S 2650 40C.

The only problem is that it is really warm here, and the motor is coming down scorching hot, the point where you can't touch the motor at all without burning yourself. I need to run some static tests, I've been lazy. I hope the motor is running to spec.
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Old Aug 27, 2012, 11:55 AM
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Canada, SK, Prince Albert
Joined Jan 2006
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Johnny - I've been lurking here because am considering an F5D airframe as next build. In my F3S planes (much larger airframe/motors) I have found through testing that these ( http://www.truturn.com/cgi-bin/store...ics130&maxp=30 )spinners dramaticly reduce the motor temps.

I have found in my applications that air on the outside of the motor (ie holes on the side of the airframe around the motor) do not cool as well as getting air "through" the motor. These spinners (TT Turbo Cool) put the ram air directly into the front of the motor.

I have reduced motor temps in my Big inrunners by over 50 degrees F using these spinners with good exit vents just behind the motor. What I don't under stand is why guys making the newer spinners for F5D (carbon) don't design in some type of Turbo design to get air through the spinner and into the front of the motor.

I know it is tougher to control heat in a smaller airframe.
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Old Aug 27, 2012, 12:14 PM
"The Judge"
sebbe's Avatar
Sweden
Joined Feb 2006
5,761 Posts
Quote:
Originally Posted by johnnyrocco123 View Post
I would love to prop up and increase the speed on my Viper. It's a dog with the current setup Neu 1115/2.5D APC 5x5, 4S 2650 40C.

The only problem is that it is really warm here, and the motor is coming down scorching hot, the point where you can't touch the motor at all without burning yourself. I need to run some static tests, I've been lazy. I hope the motor is running to spec.
that is strange, my mega 16/40/1 which is a 3150kv motor on 4s with apc 5x5 prop barely gets warm, your

2100kv motor should not even get any warmer then cold

What esc, and settings ?
And I knew, you fly where there is hot,, but still, a 2100kv motor should not get burning hot on 4s with 5x5 prop, not that big motor.. if its only related to cooling problems and hot weather, make bigger holes in front and behind the wing...
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Old Aug 27, 2012, 01:32 PM
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Joined Oct 2003
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I use mega 16/40/1 with 5s 2200 and graupner 4,7x4,7 and apc carbon 4,75x4,75...
Best choice
Neu with 5s, 1115/1y with 4,7x4,7 or best 5,2x5,2 graupner...
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Old Sep 02, 2012, 08:30 PM
You down with EPP?
johnnyrocco123's Avatar
Houston, Tx
Joined May 2009
6,675 Posts
Propping up on 4S

Today I flew an APC 5.25x6.25 on 4S.

It was very sluggish, couldn't tell for sure but looked like around 140mph tops to me.

Immediately upon landing the motor temp was 113 degrees.

Anyone opposed to trying a 6x6 or better yet a 6.5x6.5???

Also, on a Neu 1115 what is the max motor temp I want to push?

Thanks in advance
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Old Sep 03, 2012, 05:48 AM
Tim Lampe; Hobbico R&D
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Champaign, IL
Joined Dec 2009
3,644 Posts
I bet your Viper was going faster than it looked - that's how it is for me at least even on 5S (until you get a pass right down on the deck aligned with the centerline of the runway right in front of your self!).

If it can take a 5.25 x 6.25 on 5S don't see why it couldn't take a larger prop on 4S. On 5S I get about 95A - 100A static, so I guess that should be a safe number to shoot for on 4S.

Don't know what the max temp should be. 150?

Tim
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