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Old 11-03-2015, 12:05 AM   #1
Roberta
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Default Electrifying a Great Planes Little Toni

In the process of building my Little Toni and going electric power. I'm using a medium size Great Planes motor mount and a Rimfire .55 motor. I won't tie up this thread with the actual plane build but will focus on what I'm doing to convert it to electric.

My plan is to use what was intended as the fuel tank mount as the battery mount. There is a hole in the firewall where the tank and piping would have exited. I will enlarge that for more air flow and run the ESC leads into the fuselage. The ESC will be mounted on a "bow" that came with the mount. So far I started making some parts for the battery mount. Rather than paint myself into the proverbial corner, I decided to get the motor mount on now before I make things more cramped than they are.

Here are some pics of what I have done so far.

One shows the area where the fuel tank would have gone and will now hold the battery. The cowl is just set in place and spinner attached. Things look pretty well aligned. The hole in the firewall will be enlarged to increase airflow.

Roberta


Attached Images
File Type: jpg Battery and motor mount 001.jpg (76.9 KB, 143 views)
File Type: jpg Battery and motor mount 012.jpg (75.8 KB, 158 views)
File Type: jpg Battery and motor mount 014.jpg (73.3 KB, 139 views)
File Type: jpg Battery and motor mount 009.jpg (75.7 KB, 144 views)
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Old 11-03-2015, 12:26 AM   #2
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Nice mount! I use those for projects as well. Flexible as far as size and spacing yet very strong too.

Looks great so far!

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Old 11-03-2015, 01:51 PM   #3
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Thanks, Bill!!! Maybe post more pics later. Golfing later this AM.

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Old 11-03-2015, 02:41 PM   #4
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Golf... good waste of space for a flying field! lol

Have fun.

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Old 11-03-2015, 05:27 PM   #5
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Default Hum......nice! What type of batteries and capacity category?

Originally Posted by Roberta View Post
In the process of building my Little Toni and going electric power. I'm using a medium size Great Planes motor mount and a Rimfire .55 motor. I won't tie up this thread with the actual plane build but will focus on what I'm doing to convert it to electric.

My plan is to use what was intended as the fuel tank mount as the battery mount. There is a hole in the firewall where the tank and piping would have exited. I will enlarge that for more air flow and run the ESC leads into the fuselage. The ESC will be mounted on a "bow" that came with the mount. So far I started making some parts for the battery mount. Rather than paint myself into the proverbial corner, I decided to get the motor mount on now before I make things more cramped than they are.

Here are some pics of what I have done so far.

One shows the area where the fuel tank would have gone and will now hold the battery. The cowl is just set in place and spinner attached. Things look pretty well aligned. The hole in the firewall will be enlarged to increase airflow.

Roberta

Hi Roberta,

Nice project you got there!

The Cowling looks almost identical to one certain "Electric Version" that I had known as the KYOSHO Kelly F1 Reno 70 Racer It had a 55 inch wing span (1400mm) and weigh-in at around 6lbs.

I recall that it was in the box for a long time and had hesitation because it required a very long Smooth Runway run to make it worth while since it was just as heavy as the one you got.

Needless to say it was before the time that we had all kinds of various selections of Brushless Outrunners and mounts "and" watching all those Videos of it needing so much area to slow it down I then decided to SELL and got pretty much all the $$$ I paid for it as it was in high demand.

I was trying to make it as LIGHT as possible (again, at the time it was not possible) and using the least amount of Lithium Polymer Cells with a capable Brushless motor with enough RPMs and be able to swing the appropriate diameter size propeller.

I see that you selected the RIMFIRE .55 which has 480-Kv and wondering how many Cells are you thinking of using and what capacity category?

By the Way, here is the picture of the KYOSHO Kelly F1 Reno 70 Racer:



Here is the Little Toni for comparison:

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Old 11-03-2015, 05:52 PM   #6
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Default RIMFIRE .55 is the ticket!

Roberta,

Seems like a very good selection on that RIMFIRE .55

Here is a video of the Kyosho Kelly F1 70 Racer with the Scorpion S-4025-10 (515Kv) and 6-Cells!

https://youtu.be/bi4pfvl-7Ck
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Old 11-03-2015, 05:59 PM   #7
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Our Greg Covey converted a Great Planes Little Toni using the older Brushless Motor & older battery technology and you can find it half way the page at:

http://www.gregcovey.com/electric_conversions.htm
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Old 11-04-2015, 12:30 AM   #8
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Great Video!! Thanks for sharing. Greg's article is what got me interested in electrifying the Little Toni. I'm using a 6S 4000ma 40C pack in it. I have a Gecko 85A SBEC 8A ESC for it. I'm starting out with a 14X7 Xoar prop.

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Old 11-05-2015, 10:39 PM   #9
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Been working on the battery and ESC mounts. I wanted to make it easy to get the big battery in and out, yet make sure it was secured and somewhat movable for balancing the plane. It was a little tight trying to get down in the front of the plane behind the firewall and mount something to hold the front end of the battery. I finally came up with a "U" shaped fixture I was able to hold in place with my fingers through some air flow holes I cut in the "cheeks" along side the firewall. Got this idea looking at Greg Covey's site.

I was able to use one of the fuselage bulkheads to hold the platform that supports the battery when inverted. A tripler was made of 1/4" ply that was glued to the bulkhead that also supports the platform. The front end of the platform was epoxied to the back side of the firewall. A Velcro strap will hold the aft end of the battery while the fixture up front and the bulkhead in the middle will hold the rest of it.

I made a mount for the ESC that is attached to the firewall and the bulkhead. A tie wrap will hold that in place.

Look's like everything will work out OK. I also set the motor and cowl today. Lot's to do this weekend so I probably won't be working on the plane 'til next week.

Roberta


Attached Images
File Type: jpg engine install 002.jpg (73.2 KB, 103 views)
File Type: jpg engine install 005.jpg (57.4 KB, 98 views)
File Type: jpg engine install 004.jpg (66.6 KB, 102 views)
File Type: jpg engine install 015.jpg (59.8 KB, 101 views)
File Type: jpg engine install 012.jpg (64.0 KB, 102 views)
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Old 11-05-2015, 11:29 PM   #10
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Looking good!

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Old 11-12-2015, 10:01 PM   #11
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Thanks, Bill!! Some more update. Been playing with the radio and servos. Mounted the aileron servos and set the flaperon thingy. Put in the elevator and rudder servos and set the RX battery and RX. Also set up the mount for the ESC.

I was attempting to solder the 12 ga wire to the Deans plugs to make a harness for the arming plug. I do not solder well. Probably not the correct iron and that wire was too big for me. I did not like the snap associated with plugging the battery in anyway, so I ordered that arming switch with the cap switch in it to prevent arcing. Should have that in a few days.

Here are some pics of the install in the fuselage. Everyone knows what wing servos look like.

Roberta


Attached Images
File Type: jpg radio install 002.jpg (81.0 KB, 85 views)
File Type: jpg radio install 005.jpg (83.9 KB, 150 views)
File Type: jpg radio install 006.jpg (85.6 KB, 81 views)
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Old 11-12-2015, 10:10 PM   #12
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Nice! Clean installation.

Question, on your radio switch which direction is on? Forward or aft? I always set mine up to where on is aft, that way if something were to hit it in flight, (no matter how minute that chance may be), if it hit the switch it wouldn't inadvertently turn off the radio system.

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Old 11-12-2015, 10:16 PM   #13
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Thanks Bill!!! Great minds think alike!! On is aft.

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Old 11-12-2015, 11:08 PM   #14
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Originally Posted by Roberta View Post
Thanks Bill!!! Great minds think alike!! On is aft.

Roberta
Good move!

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Old 11-12-2015, 11:11 PM   #15
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On is aft because of habit from glow power. If your hand slides down the side of the fuselage as you let go of the plane you don't want the radio to turn off.

This was a COMMON issue with glow...
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Old 11-12-2015, 11:25 PM   #16
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Originally Posted by fhhuber View Post
On is aft because of habit from glow power. If your hand slides down the side of the fuselage as you let go of the plane you don't want the radio to turn off.

This was a COMMON issue with glow...
Well I started out electric, it just made sense to do it that way for me.

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Old 11-13-2015, 03:49 AM   #17
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Hand launched a sailplane one time on a "High Start" and had the switch mounted the wrong way... and it turned off as I let go.

Fortunately it stayed within 1/4 mile.
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Old 11-13-2015, 03:57 AM   #18
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I even mounted all three switches, 2 radio and ignition in my quarter scale Cub that way, and they are inside the fuselage. lol

That had to be a bad feeling to watch that plane fly away with no radio!

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Old 11-13-2015, 04:33 AM   #19
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Originally Posted by Roberta View Post
Thanks, Bill!! Some more update. Been playing with the radio and servos. Mounted the aileron servos and set the flaperon thingy. Put in the elevator and rudder servos and set the RX battery and RX. Also set up the mount for the ESC.

I was attempting to solder the 12 ga wire to the Deans plugs to make a harness for the arming plug. I do not solder well. Probably not the correct iron and that wire was too big for me. I did not like the snap associated with plugging the battery in anyway, so I ordered that arming switch with the cap switch in it to prevent arcing. Should have that in a few days.

Here are some pics of the install in the fuselage. Everyone knows what wing servos look like.

Roberta
Roberta,

It is nice to see very good progress!

Just have a question (not that you are doing anything wrong):

Q: Why the selection of what appears to be a Ni-MH Receiver Pack?

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Old 11-13-2015, 01:46 PM   #20
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The Ni-MH battery came with the radio set. I am using it as the main power source for the RX. I'm using a Li-Po for the motor and have an 8A SBEC in the ESC. There is a blocking diode in the lead from the ESC to the RX to block current flow from the RX battery to the SBEC, but allow flow to the RX from the SBEC. This gives me some extra power and redundancy. Is there some problem or incompatibility? Or are you wondering why I didn't go Li-Po with the RX battery? Thanks.

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Old 11-13-2015, 02:19 PM   #21
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The Nimh will be fine. A lot folks are going with other options nowadays, Li-FE, Lipo, 6v Nimh etc.

I use a variety and mostly 2s Lipo's on a BEC or Voltage regulator. Again personal preference. I still use 4.8v Nimhs on my smaller glow powered planes and haven't had any issues. I wouldn't run a Nimh more than a couple of season though as I've had a few that have dropped a cell around that time span.

In this hobby I think two of the most valuable tools you can have is a Wattmeter for checking motor power so you don't over amp your esc or motor. And a voltage load tester to make sure your Rx packs will hold there power under a load.

http://www.horizonhobby.com/digital-...ltmeter-han171

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Old 11-13-2015, 02:42 PM   #22
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Good tools to add to my arsenal. I will be getting that load tester and a Watt Meter to test the load of the motor. I assume the motor load test is done static on the ground with prop mounted.

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Old 11-13-2015, 03:36 PM   #23
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Yes, short runs only. Don't want to overheat the motor or ESC.

Also keep in mind the motor will unload slightly in flight as it is not being held back but the differences are nominal.

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Old 11-13-2015, 03:52 PM   #24
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Thanks, Bill!!! This forum has been very helpful with a lot of good ideas, information, and discussion. There is so much new stuff out there and things to be learned. These more powerful electric planes have way more to be concerned about than the simple RTF foamies I have more recently flown. The more sophisticated batteries, motors, ESCs, and radios can be very overwhelming and confusing. I was heavily into RC back in the mid 80s moving from mid size Glo to giant scale gas engines. Back then, electric was new and pretty much for very small things. I was out of RC pretty much for about 25 years, being into full size flying and boat building. Now electric power has become the way to go, but not without it's need for precaution and it's own inherent dangers. Lots to know. Not just put in some batteries and go.

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Old 11-13-2015, 04:02 PM   #25
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Very true, and you are going about it the right way. Just keep asking and posting. We're here for you!

It is all good info even for me, gentle reminders of things I have overlooked, forgotten, and just didn't know as well. Always good to keep the mind fresh on all this stuff.

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