.60-size Graupner Extra 300S Conversion  
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All Forums >> Electric Aircraft Universe >> Glow to Electric Conversions >> .60-size Graupner Extra 300S Conversion
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.60-size Graupner Extra 300S Conversion - 7/8/2003 1:25:00 AM   
Greg Covey



Posts: 4445
Joined: 5/24/2003
From: Rochester, NY, USA
Status: offline 		Hi,

Here is one of my latest e-conversions. It is a .60-sized Graupner Extra 300S ARF converted to electric power.

The new Graupner Extra 300S was designed for glow power but easily converts to electric flight with very few changes. The Extra 300S has a large 63” wingspan, 46” overall length, 639 sq. in. wing area, and is meant to fly at around 105 oz. (6.6lbs) with glow fuel.

I choose to power my Extra 300S with a MaxCim 13D brushless motor. It mounted easily using the 0.8oz MaxCim motor mount and the hardware that came with the plane.

A secondary goal I had for this project was to use some of the latest battery technology and build an impressive Lithium-powered high performance aerobat!

To supply power to the system, I decided to initially try a 14-cell, HR-SC2600mAh NiMH from Diversity Model Aircraft. I would then use that as my baseline to test out the advantages of using some new high-discharge Lithium Polymer cells from Kokam USA.

You can read more about it [URL=http://www.gregcovey.com/graupner_extra_300s.htm]here[/URL].

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.60-size Graupner Extra 300S Conversion - 7/23/2003 9:47:21 PM   
Henke Torphammar



Posts: 569
Joined: 10/9/2002
From: Ljungby, SWEDEN
Status: offline 		Greg,

Did you get to fly it on the Kokam 1200HD?

thinking of a Etec setup for my Kyosho CAP replaceing a 9cell
3000HV with 3s4p

_____________________________

/Henke
http://www.electric-airshow.com

(in reply to Greg Covey)
       Post #: 2

.60-size Graupner Extra 300S Conversion - 7/23/2003 9:54:30 PM   
Greg Covey



Posts: 4445
Joined: 5/24/2003
From: Rochester, NY, USA
Status: offline 		Henke,

Yes I did, many times.

In fact, if you look in my link above, you'll see that I added a power upgrade near the bottom of the page for a 5s4p pack so I could switch to a 15x10 prop for better knife edge.

I love this plane!

Regards.

_____________________________

Visit my Web Hangar at www.gregcovey.com/rc.htm

(in reply to Greg Covey)
       Post #: 3

.60-size Graupner Extra 300S Conversion - 7/23/2003 11:02:37 PM   
Henke Torphammar



Posts: 569
Joined: 10/9/2002
From: Ljungby, SWEDEN
Status: offline 		Looks very nice!!

does´t the motor vibrate if only mounded in the back?

Just rememberd, be careful not to fly it too fast... my friend lost his Extra, half the stab broke off in a dive, as I understood it he pushed it full throttle 45degree down

_____________________________

/Henke
http://www.electric-airshow.com

(in reply to Greg Covey)
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.60-size Graupner Extra 300S Conversion - 7/24/2003 12:39:19 AM   
Greg Covey



Posts: 4445
Joined: 5/24/2003
From: Rochester, NY, USA
Status: offline 		No vibration problems with the APC 15x10 e-prop. This setup also now uses an aluminum TruTurn spinner so there is no wobble either.

My ShowFlyer setup uses a 20x11 prop. It is much larger than my Extra prop and it doesn't have any vibration or torque problems.

I think the front mounting scheme is nice but a bit heavy and overkill.

Graupner fixed the tail strength issue with a brace kit that now comes with the model.

_____________________________

Visit my Web Hangar at www.gregcovey.com/rc.htm

(in reply to Greg Covey)
       Post #: 5

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