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Old Apr 07, 2014, 09:47 PM
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hog2soar's Avatar
Central California
Joined Jan 2010
919 Posts
Help!
Need help fiding a 28mm Dia. motor for my 58 oz sailplane

I need some help finding a motor to fit in my scratch built 3M, 58 ounce sailplane.

I have a Hyperion 2218-10 out-runner in another similar sailplane running I believe a 10x6 folding prop. It works fine, but no one has them. They are either not stocked or they have been back ordered for a long time.

The motor needs to be 28mm in Dia. or less to fit inside the fuselage. But it needs to be powerful enough for a 58 ounce plane.

Does anyone know of such a beast?

I could use an in-runner with a gear drive I guess, but I don't understand them, as far as what gear for what motor etc.

Any help would greatly be appreciated.

Here's a picture of the plane it's going in.

Eddie
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Old Apr 08, 2014, 12:21 AM
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The best 28mm motor I have used so far is a HobbyKing 2834 1250 kv. I have three of them and have used them in both gliders and 3D models. I used one, to start out, in a 2.5meter DG 1000 that weighs 47 ounces. The performance, with a 11X6 prop, was decent but it seemed to run a bit hot for my tastes. I could have made it run cooler but I decided to go to a different motor. I think one would need to spend a whole lot of money to find a more powerful 28mm motor.

http://www.hobbyking.com/hobbyking/s...bbyking%202834
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Old Apr 08, 2014, 10:25 AM
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Maryland
Joined Dec 2002
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If you are not worried about money:
http://www.soaringusa.com/Powerline-...025-Motor.html

http://www.rcgroups.com/forums/showthread.php?t=1903663

Or
http://www.soaringusa.com/NEU-Motor-...9-Gearbox.html
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Old Apr 08, 2014, 11:24 AM
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Ireland, County Kerry, Kerry
Joined Dec 2005
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http://www3.towerhobbies.com/cgi-bin...?&I=LXLWX9&P=6
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Old Apr 08, 2014, 06:38 PM
If it flies - I want one!
Petem's Avatar
Werribee, Victoria, Australia
Joined Jul 2008
960 Posts
Turnigy SK3?

The Turnigy SK3 Gliderdrive series might be worth a look, from HK.
They are priced in the mid $30s are 38mm diameter in a max power range from 500 to 850W and have a fixed outer case with the contacts on the rear of the motor - so easy install and no clearance problems with wires.
I have a couple and have run them up to check function, but not yet installed in a model. Another thread in this forum is discussing prop sizes and max loads.
Cheers,
PeteM
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Old Apr 08, 2014, 08:34 PM
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hog2soar's Avatar
Central California
Joined Jan 2010
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Quote:
Originally Posted by Petem View Post
The Turnigy SK3 Gliderdrive series might be worth a look, from HK.
They are priced in the mid $30s are 38mm diameter in a max power range from 500 to 850W and have a fixed outer case with the contacts on the rear of the motor - so easy install and no clearance problems with wires.
I have a couple and have run them up to check function, but not yet installed in a model. Another thread in this forum is discussing prop sizes and max loads.
Cheers,
PeteM
Thanks Pete, I'm going to see if I can fit that in the fuse. If I can, that will work perfect.

Also thanks to the rest of you for the info. I'm going to save all of it for future reference.

Eddie
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Old Apr 09, 2014, 01:49 AM
If it flies - I want one!
Petem's Avatar
Werribee, Victoria, Australia
Joined Jul 2008
960 Posts
Or MVVS?

Eddie,
Or, if you like a bit of real quality and are prepared to pay for it, the MVVS hard-case outrunners have the same layout and diameter - lovely motors, I have one in my Pulsar.
Hard to argue four times the price of the semi-clones, though. The differences are likely to be in bearing quality, shaft metallurgy (TGY tends to use a cunning alloy of aluminium and cream cheese!), and overall build quality (magnets, fits, winds, balance etc). Having said all that, I am happily running quite a few from HK with few grumbles.
Pete
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Old Apr 09, 2014, 11:02 AM
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United States, CA, Grass Valley
Joined Dec 2009
590 Posts
How about the Hyperion 2213?
I have bought from both of these vendors.
http://www.aircraft-world.com/shopdi...que+outrunners
http://www.allerc.com/brushless-moto...-7_76_165.html

or this Cobra motor 280 watts, I have this in a Oly 2 which is a bit lighter.
http://www.rcdude.com/servlet/the-24...s-Motor/Detail
Gary
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Old Apr 09, 2014, 06:17 PM
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United States, NJ, Pennsville
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Headsup Hobby has a bunch of 28mm motors.
http://www.headsuphobby.com/Power-Up...otor-F-745.htm
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Old Apr 09, 2014, 06:33 PM
Balsa addiction since age 3
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Upstate NY
Joined May 2005
1,200 Posts
At 60oz.... I can't imagine an outrunner 28mm that will meet your needs... An Great Planes Ammo inrunner with gearbox = yes.
http://www3.towerhobbies.com/cgi-bin...?&P=8&I=LXWVT4
http://www3.towerhobbies.com/cgi-bin...&I=LXLWY5&P=ML
Scott
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Old Apr 09, 2014, 07:27 PM
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Central California
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I'm going to try the new Turnigy SK3 Gliderdrive, "Outrunner in a can" and see how it works. If it works as it's suppose to then it will be well worth the $38. If not I'll go to the in-runner and gear drive. In fact I have two other sailplanes I may swap the motors out and use the "Outrunner in a can" if it works.

Scott,

Your right. The Ammo inrunner and gear drive is the way to go. And I'll definitely be using it in the future. Thanks. Now if "Uncle Sam" didn't want to take all of my money (taxes) I would by 3 Ammo's and geardrive's

I have a 70 ounce 3.2M sailplane with a Hyperion 2218-10 that's 28mm diameter that works fine. It's not a rocket ship, but it will get it to 200M in 30 seconds. The problem is no one has them anymore. I would have used one of those because I really like that motor. The current motor that's in the 60 ounce plane I'm talking about has a 28mm Hyperion 2213-16 with a 11x6 folding prop. That motor will get it to altitude with little wind 5mph or less, but it's really working hard to get the plane up and gets quite warm, but not hot. I don't think that motor would last very long if I tried to fly it more than 30 seconds for launch.

Anyway, thanks everyone for all the help.

Eddie
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Old Apr 09, 2014, 08:50 PM
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United States, CA, Grass Valley
Joined Dec 2009
590 Posts
Eddie:
Maybe you missed it or is too much money but Aircraft World had the ZS2218-14 turn for $65.
http://www.aircraft-world.com/shopexd.asp?id=6233

Good luck
Gary
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