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Old Nov 07, 2008, 11:14 AM
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lrplin's Avatar
Stockton CA.
Joined May 2007
800 Posts
Help!
Can I conver the Giant Scale 83" CMPro Cessna in to Brushless?

Hi guys,
here is the plane: http://www.raidentech.com/gisccmceskar.html
As the title said, is that doable?
Can this motor replace the suggested 2 stroke engine? http://www.hobbycity.com/hobbycity/s...idproduct=5144
Thanks.
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Old Nov 07, 2008, 11:42 AM
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Lynxman's Avatar
Troms, Norway
Joined Jan 2004
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No problem. A friend of mine flies a CMP Cessna with an Axi 5320. The motor you link to looks like it should be perfect for the plane with a 10S lipo and 16x8 or 16x10 prop if the specs are remotely accurate.
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Old Nov 07, 2008, 03:25 PM
It's me Glacier Girl
Joined Aug 2004
868 Posts
Yep those are great motors for the money. I had em in both my NitroPlanes and VQ P38's. One's now residing in my Agri Duck, and one's going in my new Gee BeeR-3.

I spun 15x13x3 APC's on 6 cells in the 38's. The Duck's running a 20x8 MAS on 6.

I have the Cessna, but "Termite" thru in a Mega motor when I bought his, so I'll be using it.

Make sure you read up the builds on the Cessna, couple of things to look out for. Like don't trust the stock nose gear. Go with a Robart or similar strut set up.
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Old Nov 07, 2008, 11:17 PM
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Stockton CA.
Joined May 2007
800 Posts
Thankyou both. It is my first time using more than 3cells lipo. Is that any thing I need to be aware of when connecting 6cells or 10cells together?
And I am going to use this 100A ESC plus a BEC for the Rx.
http://www.hobbycity.com/hobbycity/s...imple_100A_ESC
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Old Nov 11, 2008, 12:32 PM
It's me Glacier Girl
Joined Aug 2004
868 Posts
You can use the 3 cell packs, if they are a sufficant capacity, by using a series connector, or wiring your own. (Voltage doubled, capacity same as a single pack)

If your 3 cell packs aren't big enough capacity, you would wire up 4 of them, in a series/parallel connection. (Double the voltage and capacity of a single pack)

or just get the correct cell count pack.

Hobby Lobby used to sell some really slick parallel/series connectors with the Deans plugs already on them. Was a quick easy way to rig up different combos. 17th and 18th items on this page.

http://www.hobby-lobby.com/connectors.htm
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Old Nov 12, 2008, 10:24 AM
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Thanks Shelby1
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Old Feb 28, 2009, 09:34 PM
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WreckRman2's Avatar
United States, FL, Apopka
Joined Mar 2002
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I've had one of these kits sitting on the shelf for about a year and decided I might change it up and go electric. Did that motor work out well for you?
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Old Mar 01, 2009, 04:54 AM
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United States, AZ, Scottsdale
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Irplin, if you don't want to pay the $$$ for axi, check out the HXT 63-64-A over at hobbycity. I found a youtube vid of a guy flying a 11-pound 76-inch corsair on 6S lipo with that motor. Looks like it flies great! Should have no problem pulling your cessna.

Also, the supersimple 100A esc is only good to 8 series lipo cells. However, many users report it frying on 8S lipos, so i'd say 6 series is the safe maximum for that ESC.

Also, you can save the hassle of wiring packs together by just getting one of these 6-cell packs: http://www.hobbycity.com/hobbycity/s...0mAh_6S1P_20C_

CMP F4U Corsair (6 min 21 sec)


hope this helps...
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Old Mar 01, 2009, 05:43 AM
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Christchurch, New Zealand
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That's the BIG CMPro Cessna... they fly on 26cc petrol motors, so about 1900W should do it. 100A on 6s is over that, so you should be fine with 6s (of enough capacity of course) if you can find a suitable motor.
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Old Mar 01, 2009, 10:38 AM
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United States, AZ, Scottsdale
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just to clarify, are we looking to make this cessna go vertical or just cruise around? If irplin wants his cessna to go vertical (and no,there's nothing wrong with that), then 1900 watts would be perfect. 20C on that 6S 5000mah pack is 100 amps. The airplane should weigh 11.5-pounds according to manufacturer, maybe a little less with a lightweight electric power system, so 1900 wats is about 165 watts per pound. I fly my 3D airplane with that same number.

Please don't think i'm trying to sound arrogant; I'm just taking what i know from previous e-conversions, and applying it to this airplane. I'm curious though, did the big cessna go vertical with the 26cc gasser? seems like it should with that much power.

There's also the problem of prop efficency... a bigger, slower prop is much more efficent than a small, fast spinning prop. And yes, i speak from experience here too had a .60-size plane spinning a 10-inch prop on 6S, and it would barely stay up. Went down to 4S with a 14-inch prop, same watts (600) and the thing will torque roll now!

I electrified the smaller version of the cessna for a guy, and it flew fine on 100 watts/pound and 3S 5000mah lipo.

Please, power it up however you want. Sometimes it's good to have excess power to get you out of trouble. For me, excess power usually gets me into trouble

best of luck!
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Old Mar 01, 2009, 03:45 PM
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Christchurch, New Zealand
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Well, the small one seems about right with 1100 or so... mine's overpowered at almost 1300.

I don't know how it flies with 26cc, I've not seen that and only own the smaller version.
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Old Mar 01, 2009, 06:16 PM
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jfetter's Avatar
Miramar, Florida
Joined Jul 2007
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Quote:
Originally Posted by lrplin
Hi guys,
here is the plane: http://www.raidentech.com/gisccmceskar.html
As the title said, is that doable?
Can this motor replace the suggested 2 stroke engine? http://www.hobbycity.com/hobbycity/s...idproduct=5144
Thanks.
No problem to make this electric, I have 4 planes a little larger than this. My first opinion would be to go with an Axi 5330/18 (not the 5320/18 someone else recommended, max voltage is 6 cells and it has to high a kV rating for 10S) and 10S. You can turn a 3-blade 16" or a 2-blade 17" or 18" on that setup and have huge power. If you are looking for scale flight, go with an Axi 5320/18 on 6S, you'll save on the ESC since it won't have to be high voltage and you'll still have plenty of power for scale flight...

Jack
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Old Mar 01, 2009, 08:15 PM
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United States, AZ, Scottsdale
Joined Feb 2008
344 Posts
Quote:
Originally Posted by jfetter
No problem to make this electric, I have 4 planes a little larger than this. My first opinion would be to go with an Axi 5330/18 (not the 5320/18 someone else recommended, max voltage is 6 cells and it has to high a kV rating for 10S) and 10S. You can turn a 3-blade 16" or a 2-blade 17" or 18" on that setup and have huge power. If you are looking for scale flight, go with an Axi 5320/18 on 6S, you'll save on the ESC since it won't have to be high voltage and you'll still have plenty of power for scale flight...

Jack
Yup, Those axi 5330-18's are very good motors. There's a vid on youtube of a guy flying a 50cc-size yak with one of those, and it goes vertical on 10S lipo. it goes 50 feet from take-off, then he does 3 rolls going vertical

but yes, the 5320-18 or HXT 63-64-A on 6S lipo would fly it just fine, and would be real cheap. Here's a test report of that motor on 8S and 6S lipo. He reports 5356 grams thrust with a 21X14 APC-E. Don't know about the prop clearance for that plane tho..

http://www.bungymania.com/imageshome...erf1.php?id=36

Jack, what large airplanes do you have? I'm going to do a 1/4 scale wagstaff extra e-powered soon, and would love to see what kind of power setups you have.
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Old Mar 01, 2009, 09:28 PM
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Miramar, Florida
Joined Jul 2007
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Quote:
Originally Posted by parkfly27
Jack, what large airplanes do you have? I'm going to do a 1/4 scale wagstaff extra e-powered soon, and would love to see what kind of power setups you have.
I've had good luck with Axi, you'll note a common theme in my larger setups;

> Hanger 9 Sundowner F1, Axi 5330/F3A, 12S, Spin 99, Mejzlik 20 x 10
> C-ARF Impact F3A, Axi 5330/F3A, 12S, Spin 99, Mejzlik 18 x 10 3-Blade
> Sebart Sukhoi 29S 140E, Axi 5330/F3A, 12S, Spin 99, Mejzlik 20 x 10
> CAModel Genesis 3D, Neu 2115/2Y, 12S, Spin 99, Mejzlik 20 x 12 3-Blade
> KMP Pilatus PC-21, Axi 5330/F3A, 12S, Spin 99, Mejzlik 18 x 10 3-Blade

Some smaller stuff includes;

> Fliton Inspire 60, Hacker A50 12L, 6S, Spin 75, APC 17 x 10
> Fliton Inspire 90, Hacker A50 12L, 6S, Spin 75, APC 17 x 10
> Thunder Tiger Rare Bear, Axi 5320/18, 6S, Spin 75, APC 17 x 10
> Sebart AngelS EVO, Hacker A50 12L, Spin 75, APC 17 x 10

And some smaller stuff, my blog has more details...

Jack
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Old Mar 09, 2009, 09:34 AM
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Manila, Philippines and Burlingame, CA
Joined Jul 2007
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Very interested in e-conversion for the CMP Cessna as well. Please keep me posted
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