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Old Jul 19, 2012, 09:43 PM
Registered User
USA, KY, Lexington
Joined Dec 2007
640 Posts
Hi,

I currently have my Sundowner setup with the following.

Turnigy SK3 50-55 430 kv
12x10 APc
Cc Ice 100
8s (2 4s 3300 30c)

On a 12x10 it is at about 1800w iirc and 79a.

For giggles I put a 14x12 on and got 2600w at 92a. Yeah I know that's not going to last!

Anyway I'm interested in the scorpion motors and it's obvious that the ticket is the 40-35 460kv.

However what's the difference between that and the 40-25 440kv?

I would like to stick to 8s (don't need to break speed records but want more than I have now). As well could I use a 6s on the 4025 and keep the amps below or around 100?

Thanks.
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Old Jul 21, 2012, 11:08 AM
olllian
olllian's Avatar
United States, AZ, Chandler
Joined Nov 2011
608 Posts
Quote:
Originally Posted by emillard View Post
Hi,

I currently have my Sundowner setup with the following.

Turnigy SK3 50-55 430 kv
12x10 APc
Cc Ice 100
8s (2 4s 3300 30c)

On a 12x10 it is at about 1800w iirc and 79a.

For giggles I put a 14x12 on and got 2600w at 92a. Yeah I know that's not going to last!

Anyway I'm interested in the scorpion motors and it's obvious that the ticket is the 40-35 460kv.

However what's the difference between that and the 40-25 440kv?

I would like to stick to 8s (don't need to break speed records but want more than I have now). As well could I use a 6s on the 4025 and keep the amps below or around 100?

Thanks.
I would go with a 4035-400kv its a sweet moter and low in price! U can run 8s and if you feel like it u can bump it up to 10s-12s down the road. When u go up to a 460+kv ur amps go way up! As your set up now i would go with a 12x12 apc prop. I am running 12x14 and i love that prop!

http://www.scorpionsystem.com/catalo...5/HK-4035-400/

But i would get the moter from http://www.innov8tivedesigns.com but u have to call them!
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Old Jul 22, 2012, 10:22 AM
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Joined Jul 2012
5 Posts
Hi Guys Just wanted to say thanks for ur help. Took my SD 50 from 6cell to 8cell (old junk lipos) and that was the ticket. Finally broke 100 mph mark ! Here is the setup

eflite power 52 590kv
CC ice 100 amp ESC
8 cell lipo
11x11 apc gas prop
Garmin onboard gps

logging data at the end of a pass

76.6 amps
1929. watts
12516 rpm
Motor and battery temps under 105 deg after landing
onboard gps 123.3 mph

I'll start working with diffrent props to see what i can get it up to thanks agian for ur help
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Old Jul 24, 2012, 11:31 AM
Watt me worry?
Madmax1965's Avatar
Florida
Joined Mar 2006
3,808 Posts
I have a Hyperion HS 4020-910 which can handle 8s 3000mah packs. Looking for a plane to fit it in. Which prop?
I tried using Motorcalc on this motor but I couldn't come up with anything usable.
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Last edited by Madmax1965; Jul 24, 2012 at 11:46 AM.
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Old Jul 26, 2012, 11:03 AM
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Branford, Florida
Joined Jun 2010
602 Posts
Quote:
Originally Posted by Madmax1965 View Post
I have a Hyperion HS 4020-910 which can handle 8s 3000mah packs. Looking for a plane to fit it in. Which prop?
I tried using Motorcalc on this motor but I couldn't come up with anything usable.
If the Kv on that motor is 910 I dont think you'll be able to get anything to work on 8s. You MIGHT be able to get something going on 6S but it will need to be a tiny prop.
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Old Jul 26, 2012, 11:25 AM
Watt me worry?
Madmax1965's Avatar
Florida
Joined Mar 2006
3,808 Posts
I ran it up on 6s using an 11-5.5 prop...........Installed it in a Revolver 59(the small one). I do believe it is gonna be fast. I might need to go to an even smaller prop. I have had this motor sitting around forever and didn't have anything I could use it in. The stats say it will run on 6s to 8s but I don't believe it needs 8s and might run hot.

Thanks.....I will post the results later after I do a couple flights.

Hyperion tech said I could use it in their small 25e Mustang on 4s.......they said it would be very fast in that plane. So lets say 200 watts per pound .....That plane weight right around 3.5 lbs, so 3.5 X 200 = 700 watts. That motor is rated @ 1820 watts so I should be able to fly it like a rocket. Or I could go with a 40 size (around 7 lbs) and would be slightly underpowered as it suggest a 4025 motor -- although by the 200 watts per pound it should be OK.
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Old Jul 26, 2012, 02:58 PM
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Quote:
Originally Posted by Madmax1965 View Post
I ran it up on 6s using an 11-5.5 prop...........Installed it in a Revolver 59(the small one). I do believe it is gonna be fast. I might need to go to an even smaller prop. I have had this motor sitting around forever and didn't have anything I could use it in. The stats say it will run on 6s to 8s but I don't believe it needs 8s and might run hot.

Thanks.....I will post the results later after I do a couple flights.

Hyperion tech said I could use it in their small 25e Mustang on 4s.......they said it would be very fast in that plane. So lets say 200 watts per pound .....That plane weight right around 3.5 lbs, so 3.5 X 200 = 700 watts. That motor is rated @ 1820 watts so I should be able to fly it like a rocket. Or I could go with a 40 size (around 7 lbs) and would be slightly underpowered as it suggest a 4025 motor -- although by the 200 watts per pound it should be OK.
Sundowner 50.mpg (1 min 32 sec)
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Old Jul 26, 2012, 04:25 PM
Watt me worry?
Madmax1965's Avatar
Florida
Joined Mar 2006
3,808 Posts
Thank you for the video Quadmad. Sounds like my plane. I am using the Revolver as a test plane to see how the motor will work and intend to go to such as a Sundowner later on.
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Old Jul 27, 2012, 09:55 AM
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Oxnard, Ca
Joined Oct 2008
1,796 Posts
Quote:
Originally Posted by Madmax1965 View Post
I ran it up on 6s using an 11-5.5 prop...........Installed it in a Revolver 59(the small one). I do believe it is gonna be fast. I might need to go to an even smaller prop. I have had this motor sitting around forever and didn't have anything I could use it in. The stats say it will run on 6s to 8s but I don't believe it needs 8s and might run hot.

Thanks.....I will post the results later after I do a couple flights.

Hyperion tech said I could use it in their small 25e Mustang on 4s.......they said it would be very fast in that plane. So lets say 200 watts per pound .....That plane weight right around 3.5 lbs, so 3.5 X 200 = 700 watts. That motor is rated @ 1820 watts so I should be able to fly it like a rocket. Or I could go with a 40 size (around 7 lbs) and would be slightly underpowered as it suggest a 4025 motor -- although by the 200 watts per pound it should be OK.
Hey Mad,

XPC / Adrian started with a 890kv Hyperion back a while ago. He also used the 11x5.5 prop. He was pulling some crazy amp numbers on 6S, I believe 140A. I don't think you want to run the 11x5.5 on the 4020 910kv on 6S. My big issue with running an 11x5.5 is that your pitch speed is not too good, only at ~109mph, even though the prop is spinning at 20K RPM. Not useable IMO and really hard on the batteries (but thrust is awesome!).

I also toy'd with the idea of running a turnigy T600 880kv 5020 motor on 8S, but when I ran the calcs, I noticed that the motor / batts were going to get pushed really hard, so I went with a mid 400kv motor instead. I found that with the T600, the 9x7 or 9x8 would work, as there is a Jett 60 equip't SD50 a couple years back on a 9x7 APC doing 130mph and keep the amps under 100. Problem is a 9" prop on the SD50 will take forever to get up to speed but it will be easier on batts and motor.

I am attaching some calcs I ran on your setup, I think you should stick to your 6S batts since your motor is smaller for the useable prop range for the SD50. I tried running a simulation on 8S, but the calcs said the motor is unuseable in that range. Note, 6S and 10x7 prop might be your best bet, it would be what I would choose as it has good thrust and 122mph PS. Should get you over 100mph.

Good luck!
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Old Jul 28, 2012, 08:53 AM
Watt me worry?
Madmax1965's Avatar
Florida
Joined Mar 2006
3,808 Posts
Thanks for the info hawk........I believe you are right about the 11 x 5.5 drawing too many amps. I am going to hook up my amp meter today and see what I am pulling. I buttoned everything up on the plane yesterday and did a full power run-up........was danged scary. I don't remember ever having a motor sound like this...........WOW! I am using a GensAce 5300mah 6s packs and they do really good so far......on the run up the battery was only warm. I use these same GenAce packs on my large scale EDF Hawk so they work on both planes. I fly mostly EDF but since I had this motor sitting round decided to mount it in a small Revolver I had on hand. By the way I am using a 99 Amp controller and it handled the run-up so I must be pulling amps around 100Amps or so as there is usually a little head-room on the controllers. I might need to change out the controller to a 125Amp setup.

I have some 10 inch props of different pitch I will try today...first flight on Monday.

I tried to figure this motor/prop setup on MotoCal and came up with nothing which would work. All I know is this motor spins up the 11 x 5.5 like crazy...........this plane might out run my Hawk.

It is funny as I draw high amps on my EDF planes all the time.....just a fact of flying EDF. It just seems weird pulling high amps on a prop plane. Most of my flying on prop has been pattern/sport flying.....no high speed flying.
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Last edited by Madmax1965; Jul 28, 2012 at 09:04 AM.
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Old Aug 17, 2012, 08:01 AM
Watt me worry?
Madmax1965's Avatar
Florida
Joined Mar 2006
3,808 Posts
Well I ran the Revolver today using 6s 2900Mah lipos and the Hyperion hp-hs4020-0910 motor. The plane flew well and was very fast...I think about 80mph.. I am pleased with the setup and will use it in my Hyperion 40E P-51 Mustang. Funny thing is Motorcal would not let me use the 4020-910 in any setup I tried.............but in real life the plane/motor was great although I think you need at least 40c lipos to supply power for this motor.
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Old Aug 17, 2012, 01:02 PM
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USA, GA, Atlanta
Joined Nov 2008
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Quote:
Originally Posted by Madmax1965 View Post
Well I ran the Revolver today using 6s 2900Mah lipos and the Hyperion hp-hs4020-0910 motor. The plane flew well and was very fast...I think about 80mph.. I am pleased with the setup and will use it in my Hyperion 40E P-51 Mustang. Funny thing is Motorcal would not let me use the 4020-910 in any setup I tried.............but in real life the plane/motor was great although I think you need at least 40c lipos to supply power for this motor.
What kinda flight times are you putting up with the 2900mAh battery packs?
I am up to 4000-5000mAh packs on mine, but still come down early at a 4:30 timer.
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Old Aug 19, 2012, 11:23 AM
Watt me worry?
Madmax1965's Avatar
Florida
Joined Mar 2006
3,808 Posts
I am getting about 3:00 minutes so I will be going to 4000mAh packs @ 6s and 45C Gen Ace packs. The lipos I ran were 20C and they just did not do the job I wanted...........45C should work.
By the way i did run the 11x5.5 prop...........the lipos did get pretty warm but not to the point they were too hot. I can tell you at WOT this thing scares me and no way would I get in front or to the side of the prop.
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Old Aug 19, 2012, 11:52 AM
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United States, CO, Longmont
Joined Nov 2011
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Quote:
Originally Posted by Madmax1965 View Post
I am getting about 3:00 minutes so I will be going to 4000mAh packs @ 6s and 45C Gen Ace packs. The lipos I ran were 20C and they just did not do the job I wanted...........45C should work.
By the way i did run the 11x5.5 prop...........the lipos did get pretty warm but not to the point they were too hot. I can tell you at WOT this thing scares me and no way would I get in front or to the side of the prop.
If you are getting 3min flights on those 2900 packs then you are pulling around 45amps
so you will see much more speed and better flight times with the bigger packs
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Old Aug 19, 2012, 11:58 AM
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USA, GA, Atlanta
Joined Nov 2008
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I am using 4000mAh and 5000mAh batteries, all are either 35/70c or 45/90c Nanos
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