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Old 01-01-2015, 11:04 PM
huvaljohn is offline
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Quote:
Originally Posted by Fidi View Post
Hello,

I am flying a 88" and a 104" Extra Electric.
The 88" has a Hacker Q80-7M a 10S 5000mAh battery and a 170Amp controller it cost the same like Gas with Pipes
The 104" has a Plettenberg PRedator 30/8 evo a 14S 8000mAh battery and a 220Amp controller and its more expensive than Gas but it has much more Power 77lbs thrust or 12KW (428w per pound)
On our Airfield we have 12/24V for the chargers and 3 Solar Panels.

Friedrich
Any video of that 104 in action?
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Old 01-02-2015, 06:57 AM
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Hello,

Not yet because it's winter

Friedrich
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Old 01-03-2015, 11:32 AM
mchadwick63 is offline
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They're all opinions!
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I have gone all electric. Doing a build log on in this forum. The 76" Redwing Slick. This plane is perfect for electric. There is nothing to modify. Just bolt it up.
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Old 01-09-2015, 07:58 AM
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I am setting up a carden baby edge that had a da100. It has a hacker 150 with a spin pro 200 and it will run on 14s. I have lots of experience with these and they run just fine.

I too think it is a financial issue. I love a gasser and I like having the plus side of the electrics. As the cost migrates, I will be using more electric.
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Old 01-11-2015, 02:33 PM
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[QUOTE=Panther45;2226793]I am setting up a carden baby edge that had a da100. It has a hacker 150 with a spin pro 200 and it will run on 14s. I have lots of experience with these and they run just fine.

What prop size will you be using then ?
I have the same setup in a sebart Sukhoi 2.6m but 12s and its got loads of power
just wondered why 14s that's all
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Old 01-11-2015, 09:24 PM
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He could be using the lower kv version: lower kv= more torque, more voltage= more torque. It's easier on the connectors with the lower amps, and higher voltage packs can be a easier way to get more flight time than adding more packs.
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Old 01-11-2015, 10:06 PM
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Quote:
Originally Posted by AEAJR View Post

So, what is your opinion? When do they get too big for electric power to be practical?
As soon as they are big enough to put a gas motor in.
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Old 01-13-2015, 06:40 AM
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I am setting up the carden with things that I have on hand. As you all know, the batteries are a large part of the cost when we are talking 4 to 6 lipo 5000mah batteries. I am using 14s because I have the batteries and that makes it easy. I am sure the 12s system would be just fine with this big motor.

The conversion is pretty simple and that is another factor is deciding to make the change. I added a fire wall with 2.5" standoffs and the motor lined up well with the cowl. The speed control went into the tunnel for the canisters so that it will get air. The batteries are just over 9 lbs -- Turnegy 7s 5000 mah and they will fit where the tank was. The added weight is very close to the CG and these planes tend to be tail heavy so I expect it will come out pretty well.

I have not looked at the prop question as yet. This will be an imac sort of plane and I will try different props to see what works best. This motor has impressive torque compared to the large EDF motors I work with every day. A big Scuuebeler fan will turn 30,000 rpm but is not designed to do torque like the prop motors are.
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Old 04-06-2015, 06:51 AM
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So, what is your opinion? When do they get too big for electric power to be practical?[/QUOTE]
IMHO, There is no practical size limit any longer for electric powered model aircraft. Heck, they're testing 1:1 scale electric powered aircraft.
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Old 04-06-2015, 10:58 AM
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Biplanes, Twice the fun!
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I'm pretty sure it just depends on how deep you pockets are. Some people see a 6S setup out of there price range, some thats standard lineup for there planes. I personally have had up to 50cc size electric, but that is a personal preferance. I have seen 150cc size electric perform really well. With the technology out there I don't see a limit.
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Old 04-13-2015, 11:03 PM
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Crash test pilot!
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My bro and I are just finishing up a 1/3 scale clipped wing cub. Will post a video of how that flies. I think the charge times start to become a pain in the ... at the 50cc size. But that prop rip makes a plane sound more scale then a two stroke twin screaming. The other point of big electrics is you can fly them at clubs with tree hugging neighbors and strict noise limits.
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Old 04-13-2015, 11:43 PM
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At 50cc class, what sort of charge times do you consider a PITA? 15 minutes to charge a 12S/5000/60C pack isn't all that bad... Double them up on a para-board, and 4 flight packs can actually keep you flying and charging nonstop... 8 minute flight times per pack, 15 minutes to charge a pack or two... It usually takes longer than a minute to remove and hang fresh packs...

- Case
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Old 04-14-2015, 07:16 AM
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I have replaced my 12s 5300mah (2 6s packs) with 12s 2p 6600mah (6 4s 3300mah packs). I get more duration because the packs run cooler and can be recharged immediately. Each cell only sees 1/2 the current that the 12s 1p cells get and the plane uses less capacity for the same duration. Another advantage is lower cost for 6-4 cell packs ($200) compared to the 2-6 cell packs ($300). The 6s 5300mah packs are not stocked in large quantities by dealers so if a cell fails that whole 12s pack is done. Wiring 12s 2p is a chore but only has to be done once. I have one 4 pack charger and 2 older single pack charges so can fly about as often as when I only had gas. After a year of only electric I am reluctant to return to the air, gas, starter, routine necessary for a flight. I charge batteries the day before the event and can fly as often as I like.
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Old 06-22-2015, 10:47 AM
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Until they are too big for this motor

eGull Joby 20 KW Electric Motor Test on Earthstar Ultralight Aircraft JOBY101-D2 (2 min 11 sec)
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Last edited by Aeroplayin; 10-09-2015 at 05:42 PM.
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Old 06-29-2015, 05:58 AM
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NASA has announced full scale tests of a full scale electric plane as the prototype of a short range commuter 60 seat electric plane. Size is no longer a limitation:
http://motherboard.vice.com/read/nas...es-in-20-years
With size limits out of the way it is more about personal preferences and practicalities like vehicle size, budget and field size. I only fly electrics. My biggest plane is 30 pounds; 12s and plenty of power. 60-120 size is my perfect sweet spot. Flight times are less than 7 minutes but frankly I am toast at the end of those flights and need to rest my head. I don't want to fly for 10 or 20 minutes. And the silence of electric flight is golden. Our field is surrounded by deep woods in a nature preserve. Not a building in sight. Quiet electric flight allows one to enjoy their surroundings and absorb the day. I watch my fuel powered buddies and I don't think they have any more/less hassles than I do. Our aerial systems are time sponges no matter what is up front turning the prop.
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