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Old May 14, 2006, 09:28 PM
Dave (a.k.a. Kawika)
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Canada, MB, Division No. 1, Unorganized
Joined Jan 2006
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From gas to electric conversions for big planes.

Hi,

I have two planes I would like to convert from gas to electric, but I'm not sure what brushless motor, ESC, prop size and battery power I should use, or if it is even possible.

The first plane is a Great Planes Seawind Amphibian ARF .60,71"

SPECS: Wingspan: 71" (1805mm)
Wing Area: 676sq in (43.6 sq dm)
Weight: 10.25 - 12.25lb (4620 - 5555g)
Wing Loading: 35 - 41 oz/sq ft (106-127 g/sqdm)
Length: 56" (1410mm)

The second plane is a Cessna Skylane 182 ARF .40 to 52, 63" (with intent to add floats)

Technical Data:
Wingspan: 1600 mm (63)
Overall Length: 1168 mm (46)
Wing Area: 38.0 sq dm
Flying Weight: 2.5 - 2.65 kg
Engine Size: .40 - .46 (2 stroke), .52 - .65 (4-stroke)

I would like to here from anyone who has made one of these conversions or a similar likeness. Or anyone with suggestions if you have knowledge of gas/electric comparable power equivalents.

Also, If you are biulding a plane that was designed for gas but intend to use electric power, I would like to here about the modifications and how the motor was installed.

Also, if you are flying a gas to electric conversion, how does the performance compare to gas and what noticeable difference did you immediately experience.

Thanks for your time and trouble.
Dave
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Old May 15, 2006, 07:42 AM
Registered User
Ft. Lauderdale, Fl
Joined Feb 2004
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AXI 4130 at 6S-9S depending on other equipment (both the high and the low kv version works) for .60
AXI 4120 at 6S both the high and the low kv version works for your plane
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Old May 15, 2006, 08:18 AM
Jeff Carr
Ft. Mill SC / Charlotte NC
Joined Mar 2001
2,710 Posts
JR / Horizon now makes it easy. You can get the electric motor just like a nitro engine. They have a 40 size 60 size and soon 110 size. 6s2p should be good. All rotating can motors

Jeff
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Old May 17, 2006, 10:43 PM
Dave (a.k.a. Kawika)
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Canada, MB, Division No. 1, Unorganized
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Hi, Franz

The Axi 4130 would be for the Seawind? What ESC and prop would you match that with?
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Old May 18, 2006, 12:00 AM
Dave (a.k.a. Kawika)
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Canada, MB, Division No. 1, Unorganized
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Hi Jeff,

JR/Horizon? Where can I find this?
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Old May 19, 2006, 05:32 PM
1.21 Gigawatts!
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Irvine, CA, USA
Joined Oct 2000
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What kind of prop woould you use for 4130/16 with a 8S setup? what kind of amp would it pull?

Thanks.
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Old May 19, 2006, 09:48 PM
Jeff Carr
Ft. Mill SC / Charlotte NC
Joined Mar 2001
2,710 Posts
Here is the site for Horizon http://www.horizonhobby.com/ Here is the direct link

http://www.horizonhobby.com/Stores/P...d=52&CatId=APK
I run a 15x10 or 16x8 prop on my 4130/16 with 6s. Not sure what it would be with 8s

Jeff
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Old May 19, 2006, 10:14 PM
"I passed on the kool-aid"
Waco, TX
Joined Jan 2004
3,884 Posts
I suspect the cessna you mentioned is the fiberglass CMP skylane. Check out the glow/electric conversion forum for a thread discussing this plane.
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Old May 19, 2006, 10:53 PM
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Fayetteville Municipal, Arkansas, United States
Joined Sep 2004
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8S is too much voltage for a 4130/16. I have a 4130/16 that I run on 6S. I use a 17x10 APC-E Prop and it pulls 51A static and makes 1200watts with 2 ThunderPower ProLite 3S2P 4,000mah's in series. I have this in a Fliton Extra 330 FreeStyle. Rocket power. The power to weight ratio is excellent.

With 8S you would have to run a small prop. Probally a 14" at the maximum. The pitch speed would be fine for a pylon racer but nothing else.

Norman Ross Jr.
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Old May 28, 2006, 02:54 PM
Dave (a.k.a. Kawika)
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Canada, MB, Division No. 1, Unorganized
Joined Jan 2006
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Hi,
Papasmurf, here is a link to the cessna I am working on.
http://www.raidentech.com/cesk18263arf.html

I haven't worked out all the details on the size of floats, prop and batteries but I'm 99% sure I will be going with an Axi 4130 motor, that way I can use it in the Seawind as well.

I have a few HS-322HD servos, thought I'd use them if they're strong enough.

I have spent a few hours searching the forums for a similar build, found one but the end result wasn't too good, there is something about crashes and total distruction on maiden flights that make you wonder.

Anyway I'll keep searching, there is so much more to read and learn.

And thanks guys, you've given me things to ponder.

Dave
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Old May 31, 2006, 09:28 PM
Dave (a.k.a. Kawika)
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Canada, MB, Division No. 1, Unorganized
Joined Jan 2006
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Hi,

Has anyone had any expierence with Hyperion Z40 brushless motors?

Below is link where I found them.
http://aircraft-world.com/prod_datas...z40/z40all.htm

Also, I have two "3cell 4000mah lypo batteries", would these be enough to run the 4130 motor and if so how do they hook up? I have never used more then one battery on a motor.

Thanks for your time.
Dave
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Old May 31, 2006, 09:38 PM
Idle up!
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USA, VT
Joined Nov 2004
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neumotor 1912 2y-400 with 12x10 9s2p CC45HV

this setup draws 42amps

WOT airtime is about 6mins.. so I bet ya would get nearly 12-15 depending on how you flew.

This is a direct drive setup..

you could go 6s2p with this setup but you will need a cc85hv and 16 size prop..
http://brantuas.com/ezcalc/dma1.asp
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Old Jun 01, 2006, 06:58 AM
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marshall , va
Joined Jul 2003
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Prop to fuse clearance on the seawind is small, so you are limited to 13" props

a high rpm prop is your only choice, makes using an outrunner a poor choice (10/12k limit)

A tough conversion ecpecially if you limit your motor choices to outrunners.

at 10/11 lbs you need 1600/1800 + watts to take off water. 1600 watts thru a 13x10
2 blade or a 13x8 3 blade maybe.
an 8s/9s setup
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Old Jun 01, 2006, 08:18 AM
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Massachusetts
Joined Jan 2006
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Quote:
Originally Posted by kmp647
Prop to fuse clearance on the seawind is small, so you are limited to 13" props

a high rpm prop is your only choice, makes using an outrunner a poor choice (10/12k limit)

A tough conversion ecpecially if you limit your motor choices to outrunners.

at 10/11 lbs you need 1600/1800 + watts to take off water. 1600 watts thru a 13x10
2 blade or a 13x8 3 blade maybe.
an 8s/9s setup
Way too much pitch speed with a 13x10. I'd use a 13x6.5 on the Cessna Skylane with just a BM3520 motor and 5S/6S for float TOs. - No overkill needed here.

The 13x8 3 blade is perfect for the Seawind since clearance is the issue and again you don't want so much pitch speed. I'd use the AXI 4130 for the lower rpms of a 3 blade. And the 4130 can handle bursts of 2000W to get off the water.

Newt
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Old Jun 01, 2006, 01:29 PM
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USA, VT
Joined Nov 2004
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erm 1600watts for 11lbs? I disagree.. you need 100/lb for above avg performance.. 125watts if ya want better than 1:1 thrust to weight.

Your prop size limitations make it difficult on the motor selection.

Try the motor calc i posted with the 1521/2Y-780.. this can do it! but it is gonna suck about 70 amps with a 10 x 6.. that can push 196oz with a pitch speed of 103mph.. that is with a 9s2p.

You can do it with a 6s2p on a 13 x 10 prop.. but the amps are even higher.. this motor does have a gearbox available.. but I didn't check on those.

I think anyway ya look at it.. your setup is gonna run hot! oh and you wont get much flight time.. maybe 10min if you are gentle with it.
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