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Old Jul 18, 2013, 09:33 PM
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USA, NY, Middletown
Joined May 2008
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Help!
RC Guys Cessna 150 Aerobat Gas to Electric Conversion

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Hello, I am new to the electric side of RC and I think a little introduction is in order. Having always flown glow and gas engines, I have recently discovered the performance and benefits of flying electrics. It started with a used Mini Funtana that I traded for to be able to fly during my lunch hour. It was small, easy to fly, and required no liquid fuel or support equipment to carry around in my truck.

Greatly impressed by this little powerhouse, I recently acquired a Pacific Aero Models Clipped Wing Monocoupe already set up with an Eflite 160, a Castle Creations Ice2 HV160, and running 10S. This setup has impressive power and really flies that plane with plenty of punch to do almost any maneuver you can throw at it, vertical is almost unlimited. This is now my favorite plane to fly!

Having been electrified by this new "ride", I have an RC Guys Cessna with a Zenoah G26 that I want to convert to electric. I have searched the electrics forums but cannot find any threads on a conversion of that plane. I am thinking about using the same exact setup as the one I have in the Monocoupe, but I am not sure if this will be enough power to give the Aerobat spirited performance.

I have no experience in choosing setups for electrics and would like to get some input from the forum. I plan to sit the batteries in the space where the fuel tank presently resides on an adjustable and removable platform to allow the adjustment of the CG, and also mount the ESC up front with the motor to ensure it keeps cool. I am not sure if the batteries will require some venting for cooling as well, this would require cutting some holes in the firewall, something I am not too big a fan of. I also have questions of what size 3 blade prop to use with this setup.

Any recommendations and guidance is greatly appreciated. I just ask that the forum be patient as I have limited free time due to work and personal commitments (10 month old son) so the conversion will be a bit slower than I would like it to be.

Thank you in advance for your time.

Regards,

Cesar
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Old Jul 19, 2013, 11:19 AM
jrb
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Edina, MN, USA
Joined Oct 1999
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I peaked at what came up via Google for the 2 planes; looks to me like a replicate set-up should do fine.

W/o know you current prop; guessing drop the diameter by an inch @ same pitch for 3 blader.
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Old Jul 19, 2013, 01:35 PM
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Thank you

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JRB,

Thank you for your reply. I will verify the propeller I currently have on the Momocoupe and will adjust accordingly.

Regards,

Cesar
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Old Jul 31, 2013, 12:01 PM
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United States, FL, Orange Park
Joined Oct 2006
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Pacific Aero Models Clipped Wing Monocoupe

You sir are a lucky man, I have tried to find one for a couple of years. Keep me in mind if EVER want to sell. Your present set up will work fine. Just mount the motor on stand offs so its same distance to prop hub as called for, for the gasser. If you can, drill some holes around the perimeter of the firewall. Defiantly try to mount the motor controller on the firewall. Before building a battery box set the plane up on its C/G and move the batts around till you find the right spot. Post some phots of those beautys. It will help us to help you + we love photos.lol. Welcome to the wonderfull world of electrics also make sure to make some outlet holes for incoming air to escape. Sorry if you already know all this, hope it helps.Big Lacy
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Old Aug 02, 2013, 03:01 PM
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Thank you

Big Lacy,

Thank you very much for your reply. I am very happy with the Monocoupe and will definitely keep you in mind if things change.

I did not think that holes in the firewall would be necessary, but after giving it some more thought, those are big batteries and can definitely use the cooling. I have been busy at work and getting home too late to work on it this week but I hope to move the project along this weekend, I will post pics of both planes over the weekend.

Regards,

Cesar
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Old Aug 03, 2013, 07:07 PM
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USA, NY, Middletown
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Progress Pics

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I figured I would post some pics of the conversion I am doing on the RC Guys Cessna 150 Aerobat.

Picture-1 is of the rail system I installed to support the battery tray. It consists of two rails on each side to keep the tray locked in place. Next time I will rip a couple of pieces of pine and make slot down the middle so that it is a single piece. Something I thought about afterwards so it will go on my next project.
The tray is held in place by a screw that will go through the tray in the front and into a blind nut I installed into the rail that spans across the space.

I will be installing a piece of solid foam and some acorn nuts on the screw that protrude through the firewall into this space to keep the batteries safe should they get slammed into the firewall for any reason.

Picture-2 is of the Futaba 3305 metal gear servo I installed in the rudder. I had a Futaba 3010 in there originally but wanted to get a little more power back there. I will also be changing out the 3004 servos I have in the ailerons for more powerful ones as well.

Picture-3 is of the Hitec metal gear servo I installed for the steering. I wanted something sturdier up there to be able to withstand the shock of the strut a bit better.

Picture-4 is a head-on shot f the business end of the plane. That E-flite 160 sure is a sweet motor!

Picture-5 is a side shot of the setup. I hope to get some eye-popping performance out of this setup. It should give much greater pulling power than the G-26 I had in there originally.

Picture-6 is of the batteries mounted in the tray. I had the shave down two small indentations in the front piece of the rails to allow the tie wraps to slide in. I will also be installing some velcro onto the bottom of tray to keep the batteries from sliding front to back.

Picture-7 is of the tray itself. I made it from lite-ply but feel it may be a bit weak. I may double up on the wood or I may buy some 1/8" aircraft grade ply and make up a new tray. I'll wait until I maiden her to see if it is necessary.

Please feel free to comment or make suggestions, I am always looking for ways to improve my builds.
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Old Aug 10, 2013, 10:32 AM
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USA, FL, Clearwater
Joined Dec 2007
695 Posts
Balance is the Key..As Long as the plane is Balanced, that's the 1st step.
2. check out this web site..this should be helpful in deciding if you should use those Electronics in that plane.

http://www.centralhobbies.com/electr...t/powerch.html

http://www.ultimaterc.com/forums/sho...d.php?t=106557

Let us know how it works out.

Reggie
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Old Aug 28, 2013, 12:36 PM
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United States, MN, Elk River
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Have you got that bad boy done yet? I have one of these on order and my big question is how much room is there for your hand and the batteries when installing them. I am using the same setup with a 3 blade Biela 18x10. It pulled my 17 lb Storch like nobodys buisiness so this bird should be no different.
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Old Aug 28, 2013, 12:39 PM
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United States, MN, Elk River
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I am digging your motor mount too!
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Old Aug 28, 2013, 04:22 PM
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United States, ID, Shelley
Joined Dec 2011
445 Posts
What is your expected flying weight? Or its original weight as a gasser?
If we know the weight and the desired flying style, we can certainly fine tune the power system to be efficient and sufficient so as to not damage batteries and other expensive componants.
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Old Sep 30, 2013, 10:45 AM
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United States, MN, Elk River
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Not to steal the thread, but I am assembling mine now. I am running the power 160 with the Castle 120 on 10s. I had this setup in a 17 pound plane already using a Biela 18x10 3 blade prop and I never needed to go over half throttle. This plane is unbelievably awesome looking. However, the covering is cr#*p. Some of the sheeting on the fuse separates because it isnt glued well. The supplied z bend control rods are not even close to being the right length. Mine came with no mounting blocks for the engine cowl, and the mounting location for the control horn on the flaps is hollow. I hope it doesnt pull out. I also peeled the lettering off of the fuse because you cant get the wrinkles out of the covering unless you remove them. I hope it flies as good as it does on all of the youtube videos. Have you flown your conversion yet clandestoy?
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