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Old 05-06-2014, 02:50 AM   #1
fpveric
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Default Hobby Guys 1/4 scale Piper Cherokee

Building out an electric, Hobby Guys 1/4 scale Piper Cherokee. I'm using a Eflight power 160 (2500 watts) and a Castle Ice 100 esc with 2, 4c 5200mah bats in series. I had a DLE 55 on it with electric start and it had insane power, but I need the motor for a mustang I'm building and this seemed like a good fit for an electric conversion.

What do you guys think? is this gona have enough power to swing a 20 x 10 prop and pull out of a stall or will I have to fly it scale?

I'll let you know how it turnd out next week.
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Old 05-06-2014, 02:55 AM   #2
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BTW, I've found that the power 110's have a lot more power than a 30cc but can't say about the 160 and a 50cc
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Old 05-07-2014, 03:11 AM   #3
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Originally Posted by fpveric View Post
Building out an electric, Hobby Guys 1/4 scale Piper Cherokee. I'm using a Eflight power 160 (2500 watts) and a Castle Ice 100 esc with 2, 4c 5200mah bats in series. I had a DLE 55 on it with electric start and it had insane power, but I need the motor for a mustang I'm building and this seemed like a good fit for an electric conversion.

What do you guys think? is this gona have enough power to swing a 20 x 10 prop and pull out of a stall or will I have to fly it scale?

I'll let you know how it turnd out next week.
fpveric,
I don't know enough about large electrics to offer any advice but I will give you a bump and request, "Please post pictures as your build continues!"

What do you think the AUW will be?

Please call me John. I came up w/ Max2112 when I thought you were all internet predators after me Lucky Charms!!
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Old 05-07-2014, 03:34 AM   #4
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Originally Posted by fpveric View Post
Building out an electric, Hobby Guys 1/4 scale Piper Cherokee. I'm using a Eflight power 160 (2500 watts) and a Castle Ice 100 esc with 2, 4c 5200mah bats in series. I had a DLE 55 on it with electric start and it had insane power, but I need the motor for a mustang I'm building and this seemed like a good fit for an electric conversion.

What do you guys think? is this gona have enough power to swing a 20 x 10 prop and pull out of a stall or will I have to fly it scale?

I'll let you know how it turnd out next week.
The Eflight Power 160 can be run up to perhaps 2000 Watts, comparable to a DLE 30 cc gasser. The DLE 55 cc is good for about 3500 Watts or so.

Putting 2000 Watts on a 18 pound Piper should haul it up fairly well. I'm running 2500 Watts on a Giant Scale Big stick that has 72 inch wingspan, and 18 pounds. That power system hauls that model straight up.

This thread will provide a comparison between glow/gasser and electric power systems.

http://www.wattflyer.com/forums/showthread.php?t=73275

And several other Giant scale models I've put together with the same Hacker A60-16M And Hacker A60-5S motors, running around 2500 Watts or so, on a 19X12 prop.

Great Planes Giant Big Stick Electric Conversion
http://www.wattflyer.com/forums/showthread.php?t=65052

Giant Scale Cessna Model
http://www.wattflyer.com/forums/showthread.php?t=66414

Redwing MXSR Model
http://www.wattflyer.com/forums/showthread.php?t=72225

I've got 27 flights on that MXSR model now, and the Hacker A60-5S power system with the 10S2P A123 pack and a 19X12 wide blade APC-E prop will fly straight up, out of sight. That always impresses the club members flying that same model with a 30 cc DLE gasser up front.

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Old 05-07-2014, 03:52 AM   #5
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Default The build is coming along..

I had to build a 2 3/4' x 4' box for a motor mount. The DLE 55 was longer than the electric motor. I'll epoxy it all in and run 3/16' x 4' bolts through the new box and firewall to mount it. Everything is just tacked on with a few drops of CA for now, to ensure a good cowling fit. the ESc will mount on the right side of the box and the nose wheel servo will go on the right.

Once I find the new CG point I'll just build a simple battery box and add Velcro. It looks like the plane is gonna go from about 19 pounds, down to about 14 pounds. That should give it an almost 1:1 thrust to weight ratio. It won't 3D but should fly just fine. It's not a 3D plane anyway.

I think the hardest thing about the conversion is going to be taking the old gasser off the plane.


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Old 05-07-2014, 04:10 AM   #6
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Default I'm hoping for closer to 2250 watts.

It's a 108' wingspan plane. If I end up with only 2kw, I might be a little underpowered.
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Old 05-07-2014, 05:11 AM   #7
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Originally Posted by fpveric View Post
It's a 108' wingspan plane. If I end up with only 2kw, I might be a little underpowered.
Back in the late 1990's I had a 1/4 scale Piper Cub powered by an Astroflight geared 90 brush motor. Power was about 1000 watts, wingspan was nearly 10 feet.

It was not overpowered, taking off from a grass field in about 50 feet. It could do loops, but not a lot more than that.

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Old 05-08-2014, 12:04 PM   #8
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Default Well, it's done in therory..

I don't think it's gonna be underpowered anymore. It blew an unopened beer off my bench 6 feet away but I've still gotta weigh it and get a real static thrust measurement to be Shure.

I've still got to set my center of gravity. the manual is kind of vague as to where it should be. I didn't build it with the gasser so I'm not Shure where it was b4 either.

I'll work on that stuff tomorrow and maiden it on sat. I'll let you guy know how it goes. So, far this plane looks like it's an almost ideal giant scale electric. OO. I also converted the canopy over to a magnetic hatch. It was super easy and works great.
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Old 05-08-2014, 01:49 PM   #9
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Eric

Very interested in your conversion.
A maiden video would be nice?

GOOD LUCK!
Jimmy
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Old 05-08-2014, 02:00 PM   #10
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Default Maiden..

I'm Shure someone will have a cam going. I'm a notoriously bad pilot anytime I maiden a plane someone films it, hoping to get the crash on youtube,,,
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Old 05-08-2014, 10:41 PM   #11
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Eric

Think positive!!!!
With a build looking that GREAT,
it's going to be a good maiden!!

Regards
Jimmy
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Old 05-09-2014, 01:16 AM   #12
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Originally Posted by fpveric View Post
I don't think it's gonna be underpowered anymore. It blew an unopened beer off my bench 6 feet away but I've still gotta weigh it and get a real static thrust measurement to be Shure.
Yeah
You've got to be real careful powering up those multi-kilowatt motors in your home!

But the important part, did your can of beer survive without springing a leak? :

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