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GP extra 300s .40

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Old 12-06-2004, 12:25 PM
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odyssey6661
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Default GP extra 300s .40

I've been building the Great planes Extra 300s Kit plane for some time now. I was orginaly going to make it a glow engnie plane but I really want to make it an electric. I'm looking at the knontronik fun 500 w/ gear box for a motor. Can any one give me advice for an esc and battery option. I want to use Li-po, and I'm looking for the longest flight time possiable. Thanks for your help.

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Old 12-06-2004, 03:25 PM
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Greg Covey
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Default RE: GP extra 300s .40

If this is your kit [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJ580&P=ML]here[/link] then it is meant for a .60-.90 2-stroke glow engine.

I would recommend using the Kontronik [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXGCW7&P=7]Fun 600-17[/link] brushless motor for only $20 more.

Use it with a [link=http://www.hobby-lobby.com/jetiblue.htm]Jeti Advance 77-amp Opto[/link] ESC and an APC 14x7 or 14x10 e-prop depending upon desired top end speed.

You can use either a 20-cell CP2400 NiCd or GP3300 NiMH battery pack or even a 6s configuration of Lithium cells that can deliver 50amps continuous.

Good luck!
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Old 12-06-2004, 03:37 PM
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Default RE: GP extra 300s .40

Long flight times means that you need to pop in a larger motor to get it to stay cool.

I would how ever recomend setting it up for 7-10min flights, then a lighter motor and smaller pack can be used, which also leads to a cheaper total.

don´t know much about the Kontronics spec, geard motors work very well when you need a light yet powerful setup. I would use a Hacker C50L 6.7:1 and 6s3p TP6000 lite, assuming it is in the 7.5-8lb range. (maybe kontronik works as well, but I have flown lot´s of Hacker and know how they work)
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Old 12-06-2004, 05:09 PM
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Default RE: GP extra 300s .40

My plane is the 40 size one. That is why I'm deciding on the Kontronik 500 geared. The specs say the weight of the plane should be 5.75 but that is with a glow motor. Do yall think a 500 is still to small?

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Old 12-07-2004, 11:33 AM
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Default RE: GP extra 300s .40

Ok, I see your .40-size kit [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJ579&P=7]here[/link].

Yes, the geared 500 should work here. Unfortunitly, Hobbico doesn't seem to sell the Jazz-55 by itself because that would work for you. I would still recommend the Jeti 77-amp Opto ESC over the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXGCW2&P=7]Kontronik Jazz 40-6-18[/link] ESC.

Ok, it looks like I lied but Tower recently added the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXHYK6&P=7]Jazz 55-10-32[/link] ESC to their individual sale links. Previously, it was only available as part of the 600 Brushless Set. This ESC would work fine on your 500 motor. My reservation is with using it on the 600 motor because it cuts out around 800 watts.

Note that the [link=http://www.hobby-lobby.com/jetiblue.htm]Jeti 77-amp[/link] ESC is about $100 less.

Henke,

The Kontronik Brushless 600 motor appears to be similar size to the Hacker B50XL motor.
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Old 12-07-2004, 02:21 PM
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Default RE: GP extra 300s .40

Would a Castle creations phoenix 60 or 80 be a good choice? I'm looking hard at the TP 5S3P 6000mah battery. Is that too much battery? If not, witch esc would you recommend for this battery? Let me also mention I very very new to the electric community. Understanding how power systems work is difficult for me to understand right now, that is why I'm researching as much as I can now before I fudge something up. Trust me, I appreciate everything you guys are helping me with.

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Old 12-07-2004, 04:47 PM
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Default RE: GP extra 300s .40

5s3p is pretty good I think. I would personally use a 4s3p and try to get it light, same performance and flight times, just a bit lighter. smallar pack, smaller motor, lighter ESC smaller servos, cut away some wood... light is good.

I have a 4.18lb Kyosho CAP, which flies just as well at 8lb but land so slow and nice at only 4.18lb

no need to have 2:1 thrust to weight ratio on a non 3D plane, better get it to fly nice instead.
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Old 12-08-2004, 10:38 AM
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Default RE: GP extra 300s .40

I agree with Henke on using the 4s3p instead of the 5s3p pack.

Part of the confusion comes from the different offerings of the Kontronik 500 motor. If you choose the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXGXV2&P=7]Kontronik Fun 500-27 w/5.2:1 Gear Drive[/link] then a 4s pack will work fine with a 14"-15" prop.

You won't even be taxing the motor at 40amps full throttle.
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