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Old Feb 02, 2011, 12:53 PM
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Longmont, Colorado, United States
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I have a few tenderfoot questions too:
What RTF weight should I expect ?
How much power I need for "just flying" ?
Which servos fit Orion ?
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Old Feb 02, 2011, 01:59 PM
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Empty weight is right around 34 oz. Probably want to use a geared Neu 1105/1107 or Hacker B40, or equivalent, and 3S 2200mah battery is at the lower end of the power scale. I estimate 65 oz. RTF for mine. The only servo that may present a challenge is for ailerons. 9mm thick is what will fit easily. I think Lenny has managed to get a 10mm thick servo in there but, without a raised servo cover, I don't think you can go any thicker.
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Old Feb 02, 2011, 02:30 PM
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I have a few 4S packs and would like to build power system around them.
I would like to make some estimation using MotoCalc, but I don't know how many watts I need.
How many watts per pound I need for "sport flying" ?
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Old Feb 02, 2011, 04:11 PM
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I don't think the sport flying watts/pound guideline is really important for a glider. The reason for this is most electric gliders use the motor only to climb. You can fly it like a hotliner as shown in Bob's video or climb and cruise around like a thermal glider. Aside from weight increases, you can use a variety of power systems. How big are your 4S packs?
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Old Feb 02, 2011, 04:15 PM
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I have 2650 mAh 4S packs. Too big ?
I would like to fly it like a thermal glider.
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Old Feb 02, 2011, 04:24 PM
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That's about the same size batteries I will use. You will probably want a 14-17" prop. I will start with a Hacker B50-9S geared 6.7:1. That's way more power than needed though. Hope this helps some?
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Old Feb 02, 2011, 04:34 PM
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Yes, it helps, thank you.
Right now it seems "too much of motor" (I mean B50).
I will make some estimation today and will ask some new questions tomorrow.
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Old Feb 02, 2011, 05:12 PM
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I think if you go down just a little from Bob's setup (info earlier in this thread), that would be a good lighter setup. Good place to start anyway.
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Old Feb 02, 2011, 05:29 PM
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Go down in power ?
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Old Feb 02, 2011, 11:44 PM
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Thanks Lenny, I wasn't accurate before when I said 3S 2200 as you can use a total battery capacity of 6600 mAh. So a 2S 3300 is OK too. Would that change your motor preference much, with another choice of battery?
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Old Feb 03, 2011, 10:22 AM
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I am a little bit scared...
Both systems (Neu 1110/1Y and Hacker B50-9S ) have input around 1000w and thrust around 120 oz on 4S pack.
Do you really use these setups ?
Do I need so much power to fly it like a thermal glide?
RTF weight 65-70 oz.
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Old Feb 03, 2011, 10:53 AM
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Very good settup info here:

http://www.acemodel.co.uk/electric-m.../prod_289.html

My model has simillar power and it is good to fly. Pretty fast climb and thermals well.
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Old Feb 03, 2011, 11:19 AM
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Quote:
Very good settup info here:
http://www.acemodel.co.uk/electric-m.../prod_289.html
My model has simillar power and it is good to fly. Pretty fast climb and thermals well.
It's about 500W input and 65 oz of thrust.
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Old Feb 03, 2011, 05:12 PM
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Quote:
Originally Posted by bananaman View Post
Thanks Lenny, I wasn't accurate before when I said 3S 2200 as you can use a total battery capacity of 6600 mAh. So a 2S 3300 is OK too. Would that change your motor preference much, with another choice of battery?
Not really. I'd prefer a 3S setup over a 2S setup, unless you already have a 2S motor on hand and wanted to use it.

Lenny
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Old Feb 03, 2011, 05:19 PM
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Quote:
Originally Posted by bastun View Post
I am a little bit scared...
Both systems (Neu 1110/1Y and Hacker B50-9S ) have input around 1000w and thrust around 120 oz on 4S pack.
Do you really use these setups ?
Do I need so much power to fly it like a thermal glide?
RTF weight 65-70 oz.
No, you don't need that much power. This model would fly very well on 400-500 watts.
Many people enjoy having more power though. It's more fun to shoot up to soaring altitude in 5 seconds than climbing for 10-15 seconds to get to the same place.
The amount of energy (watt-minutes) used is roughly the same, it's just that the higher power model uses it in less time.

Lenny
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