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Old Apr 08, 2013, 04:04 PM
A man with too many toys
United States
Joined Feb 2001
17,354 Posts
Help!
Need help with 60 size motor selection.

What’s the wattage equivalent of a 61 glow with a tuned pipe. I have a couple of 70’s era pattern/sport airplanes that I would like to convert to EP.

From what I have read I think a 6s LiPo would be about right. Would a 6s 5000 be too heavy?

The other potential problem is prop clearance. I think the glow engines used mostly 11 and 12 inch props. Maybe a 13 would fit but that would be the max.

Any thoughts or useful links would be appreciated.

.
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Old Apr 08, 2013, 06:04 PM
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TripleW's Avatar
Prescott, Arizona
Joined Feb 2010
6,759 Posts
You need a High Kv motor for small prop size.
Something like this.
http://www.hobbyking.com/hobbyking/s...ner_700kv.html
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Old Apr 08, 2013, 06:18 PM
A man with too many toys
United States
Joined Feb 2001
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Quote:
Originally Posted by TripleW View Post
You need a High Kv motor for small prop size.
Something like this.
http://www.hobbyking.com/hobbyking/s...ner_700kv.html

Not sure if that will be enough power. I was thinking of something about 100 amps and 2200 W. So that goes back to my original question of how many watts is equivalent to a tuned pipe 61?



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Old Apr 08, 2013, 06:34 PM
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TripleW's Avatar
Prescott, Arizona
Joined Feb 2010
6,759 Posts
2hp is almost 1500 Watts.
How much Hp is your 61 with a tune pipe.

60 equivelent motor
G60-300 1425 watts
http://www.hobbyking.com/hobbyking/s..._60_Glow_.html
G60-500 1500 watts
http://www.hobbyking.com/hobbyking/s..._60_Glow_.html

Looks like it's in the ballpark to me. And that other motor can take up to 8s.
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Old Apr 08, 2013, 09:16 PM
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Doug Bartley's Avatar
Canada, ON, Owen Sound
Joined Oct 2008
2,704 Posts
1500 watts is 2.01hp. The problem with the motors shown is they are grossly overrated. Much safer at 1000-1100watts.
I ran a Scorpion 4020-12 with a 12/12 Apc E on 6s, it produces 1720watts/77a and 124.6mph on gps at 10,200rpm. Thats far faster than any tuned pipe 61 ever went with their 6" pitch props. The motor came down from 6 minute flights almost cold, can't say the same about the 15 and 20C batteries I was using back then. The newer style 30-40c batteries are much better at delivering these power levels without overheating.
Best to forget about glow engines when looking to set up a hot electric. Weigh the plane, estimate AUW including batteries, pick a power level, anything over 200w/lb is ballistic. Most planes will fly very well at 100w/lb, be acrobatic at 125w/lb, and go up from there for more performance at the expense of flight time and the blue smoke trails. Top of the line motors like Scorpion, Hacker can take this use, HK cannot, at least not for long!! JMHO FWIW Doug B
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Old Apr 11, 2013, 10:13 PM
Registered User
Tucson
Joined Nov 2009
899 Posts
Get the weight of your plane. You should always size electric systems to haul the weight of the plane. Then allow at least 150 watts per pound (more is better, as you can fly at less than close to max throttle.

Personally, I would pick a 2,200 watt motor rated for 6-8S, and run it on the cheaper 6S batteries with a 15-16 inch prop. A 60 size plane should be able to carry 7,500 - 10,000 mAh of 6S batteries, along with a switching BEC for the RX and servos and a 1500mAh battery for that. 11 lbs of thrust on an 8 lb plane would be nice.
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Old Apr 12, 2013, 05:09 AM
A man with too many toys
United States
Joined Feb 2001
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Quote:
Originally Posted by wuest3141 View Post
Get the weight of your plane. You should always size electric systems to haul the weight of the plane. Then allow at least 150 watts per pound (more is better, as you can fly at less than close to max throttle.

Personally, I would pick a 2,200 watt motor rated for 6-8S, and run it on the cheaper 6S batteries with a 15-16 inch prop. A 60 size plane should be able to carry 7,500 - 10,000 mAh of 6S batteries, along with a switching BEC for the RX and servos and a 1500mAh battery for that. 11 lbs of thrust on an 8 lb plane would be nice.

15” Prop ???????????

Their is no way that anything larger than a 13” prop will ever have enough ground clearance!

Besides such a large prop is really going to look goofy?????????????????????????


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Old Apr 12, 2013, 05:57 AM
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edbu1's Avatar
United States, FL, Sanford
Joined Feb 2007
227 Posts
A 15 inch prop probably would hit the ground unless you modify the landing gear. But as for looking goofy?!!!??? Have you not ever noticed how small our propellers are, scale-wise, compared to full size airplanes? Every the larger electric motor props are way too small out of scale compared to full size airplanes.
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Old Apr 12, 2013, 12:13 PM
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LawnDartMike's Avatar
United States, OR, Salem
Joined Jan 2012
287 Posts
So what is the weight of the planes? I'm running this motor on a 5.5 lb P-47 and with a 4s and 14x7 prop it is way over powered. On 5s you can get about 7 lbs of thrust with an 11x7 prop. I have had good luck with the four large Emax motors I'm running.

http://www.headsuphobby.com/Emax-GT4...otor-F-211.htm
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Old Apr 13, 2013, 03:32 PM
A man with too many toys
United States
Joined Feb 2001
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Rimfire 60

I have been looking at lots of motors. I usually buy Scorpion but I found that the Rimfire 60 has the specifications I am looking for and is $30 cheaper than a Scorpion. Does anyone have any comments of this motor? Are Rimfire motors good or bad?
http://www3.towerhobbies.com/cgi-bin...&I=LXLWV8&P=ML

.
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Last edited by RC Man; Apr 13, 2013 at 03:59 PM.
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Old Apr 14, 2013, 09:13 AM
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Kimber's Avatar
USA
Joined Mar 2005
4,359 Posts
Quote:
Originally Posted by RC Man View Post
I have been looking at lots of motors. I usually buy Scorpion but I found that the Rimfire 60 has the specifications I am looking for and is $30 cheaper than a Scorpion. Does anyone have any comments of this motor? Are Rimfire motors good or bad?
http://www3.towerhobbies.com/cgi-bin...&I=LXLWV8&P=ML

.
Rimfire motors are top of the line, just over priced.
Check Headsup or Hobbypartz. Bigfoot.



Tacon 46



http://www.hobbypartz.com/96m606-big...030-400kv.html
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Old Apr 14, 2013, 03:41 PM
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Tulsa Int, Oklahoma, United States
Joined Oct 2003
242 Posts
Check out this build in the Classic Pattern forum: http://www.rcgroups.com/forums/showthread.php?t=1436652

The whole thread has good info, but check out the last page first.
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Old Apr 14, 2013, 04:36 PM
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scottc39's Avatar
USA, MN, Shakopee
Joined Sep 2004
1,190 Posts
Quote:
Originally Posted by Kimber View Post
Rimfire motors are top of the line, just over priced.
Check Headsup or Hobbypartz. Bigfoot.



Tacon 46



http://www.hobbypartz.com/96m606-big...030-400kv.html
I agree with Kimber on the rimfire motor great power, have the .46 in my escapade.
if your go to headsuprc be careful as they test there motors with very c rated batterys that most folks dont use, iam not bashing them just a note to be informed about.
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Old Apr 14, 2013, 04:51 PM
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Kimber's Avatar
USA
Joined Mar 2005
4,359 Posts
We have a 32 size Rimfire in a Tower 40 trainer, great performance
on 4s.
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Old Apr 14, 2013, 05:00 PM
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scottc39's Avatar
USA, MN, Shakopee
Joined Sep 2004
1,190 Posts
i also have rimfire .32 in my stinger 2 plane, i get over 700 watts on 4 cells to and again great performance to.

Quote:
Originally Posted by Kimber View Post
We have a 32 size Rimfire in a Tower 40 trainer, great performance
on 4s.
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