PDA

View Full Version : Super Cub Outrunner Brushless Conversion


Hack73
10-11-2007, 01:21 PM
Motor is a outrunner Towerpro BM2409-18T mounted on the stock motor mount that had the gear box & shaft removed and sanded down. The circuit board is from an old PC controller card I had laying around (I cut the square piece from part of the card that barely had any chips or other electronics). The circuit board is secured using the stock bolts that hold the stock motor mount. I found a piece of wood that had the correct width to extend my motor up to the innermost part of the cowl. It is secured to the circuit board using (2) screws. Finally, the motor is mounted to the wood using (3) small wood screws.
Motor is connected to the TowerPro BEC:
BESC: 25A (programmable)
Current: 25-30A
Voltage: 6-12V
BEC 3 Cell Lipo
Size: 45x38x10mm 24.5grams
http://img2.putfile.com/thumb/10/28108340518.jpg (http://www.putfile.com/pic.php?img=6828187)
I got the whole setup here: http://www.unitedhobbies.com/UNITEDHOBBIES/store/uh_viewItem.asp?idProduct=4711

http://img2.putfile.com/thumb/10/28106545237.jpg (http://www.putfile.com/pic.php?img=6827778) http://img2.putfile.com/thumb/10/28106545135.jpg (http://www.putfile.com/pic.php?img=6827772)
http://img2.putfile.com/thumb/10/28106545186.jpg (http://www.putfile.com/pic.php?img=6827777) http://img2.putfile.com/thumb/10/28106545159.jpg (http://www.putfile.com/pic.php?img=6827775)
http://img2.putfile.com/thumb/10/28106545028.jpg (http://www.putfile.com/pic.php?img=6827765) http://img2.putfile.com/thumb/10/28106544941.jpg (http://www.putfile.com/pic.php?img=6827764)
http://img2.putfile.com/thumb/10/28106545158.jpg (http://www.putfile.com/pic.php?img=6827773) http://img2.putfile.com/thumb/10/28106545088.jpg (http://www.putfile.com/pic.php?img=6827771)
http://img2.putfile.com/thumb/10/28106545074.jpg (http://www.putfile.com/pic.php?img=6827769) http://img2.putfile.com/thumb/10/28106545023.jpg (http://www.putfile.com/pic.php?img=6827768)
http://img2.putfile.com/thumb/10/28106545049.jpg (http://www.putfile.com/pic.php?img=6827767) http://img2.putfile.com/thumb/10/28106545062.jpg (http://www.putfile.com/pic.php?img=6827770)

Hack73
10-11-2007, 01:22 PM
I am currently having trouble with the pitch. It wants to pull and roll to the right. Will update when I have the correct angle with this motor.

newjak
10-12-2007, 09:13 PM
I am currently having trouble with the pitch. It wants to pull and roll to the right. Will update when I have the correct angle with this motor.

Dont forget to recheck your CG. You are now using parts that are much lighter than the originals.

Hand-Eye-Guy
10-14-2007, 09:05 AM
I am currently having trouble with the pitch. It wants to pull and roll to the right. Will update when I have the correct angle with this motor.

I just finished our SuperCub brushless conversion with an EFlite Park 450 with STOCK thrust and it flies great! Yes it does gain altitude quickly with throttle only applied, but tracks straight as an arrow.

I used an exterior grade MDF for the mount & held it in place with some Gorilla Glue & packing tape. I also installed some wings struts fabricated from carbon rod and 1/8 scale buggy sway bar links. I've got to say that the structural integrity of the plane is greatly improved, so much that she almost doesn't need elastics to hold the wing!

I honestly couldn't of installed this set up without the help of this boards members!

grubbyjeans
11-12-2007, 07:03 PM
I'm adding ailerons to one of my SC planes and will then convert to brushless. Should I also convert to LiPo or will the stock batteries work until I gain some experience with aileron flight?

I don't want to spend ALL my piggy bank on the SC.
grubby.

Fly Time
11-12-2007, 11:03 PM
I'm adding ailerons to one of my SC planes and will then convert to brushless. Should I also convert to LiPo or will the stock batteries work until I gain some experience with aileron flight?

I don't want to spend ALL my piggy bank on the SC.
grubby.

For best performance you should convert to lipo, but you don't have to. Most brushless ESC's come pre-programed for lipo low voltage cutoff, so you will have to re-program it for the proper NiMH cutoff (lower than lipo).

As an alternative, you could upgrade the battery first which would give the stock brushed motor a boost in power. There is a jumper on the ESC that you remove to run lipo - a very easy upgrade I'm told (mine is still running stock).

You will burn up the motor quicker, but by then you may have $ to upgrade the motor and ESC too. Or just buy a new brushed motor for $10 and save up for your next airplane.

grubbyjeans
11-13-2007, 12:21 AM
For best performance you should convert to lipo, but you don't have to. Most brushless ESC's come pre-programed for lipo low voltage cutoff, so you will have to re-program it for the proper NiMH cutoff (lower than lipo).

As an alternative, you could upgrade the battery first which would give the stock brushed motor a boost in power. There is a jumper on the ESC that you remove to run lipo - a very easy upgrade I'm told (mine is still running stock).

You will burn up the motor quicker, but by then you may have $ to upgrade the motor and ESC too. Or just buy a new brushed motor for $10 and save up for your next airplane.

This is the SC with the failed system in it (remember the video) so I'll have to replace the tx/rx anyway. I have a set of micro servos that I'll be installing also. That is a lot of money in this plane. If I can fly it successfully with the brush motor that is currently in it, I will. I'm just thinking that a more power might be required.

Fly Time
11-13-2007, 12:32 AM
This is the SC with the failed system in it (remember the video) so I'll have to replace the tx/rx anyway. I have a set of micro servos that I'll be installing also. That is a lot of money in this plane. If I can fly it successfully with the brush motor that is currently in it, I will. I'm just thinking that a more power might be required.

Yes I remember. I also recall that you already got a new brushed ESC. That won't work for a brushless motor, so there goes more $$$ if you want to upgrade the motor too!

You might want to consider how many servos you can run off your BEC. If it came with any documentation at all it should say. But then again you got it from Raidentech, so maybe not. 4 servos shouldn't be asking too much of it, but if not you could have a Rx failure.

This can be an expensive hobby! Just don't tell my wife that. I keep bragging about how cheap electric ARF's are! She doesn't need to know about all the other stuff you have to buy ;)

grubbyjeans
11-13-2007, 01:09 AM
Yes I remember. I also recall that you already got a new brushed ESC. That won't work for a brushless motor, so there goes more $$$ if you want to upgrade the motor too!

Yes, I wanted to power the plane without changing the electronics any more than necessary and thought the current setup should suffice while I climb the learning curve. :<: I'm only considering more power as I don't know how the plane is going to be affected with the two extra servos.

You might want to consider how many servos you can run off your BEC. If it came with any documentation at all it should say. But then again you got it from Raidentech, so maybe not. 4 servos shouldn't be asking too much of it, but if not you could have a Rx failure.

It turns out that the ESC doesn't incorporate BEC, so I'll be exchanging it for one that does. The servos are micros so I don't expect too much extra current draw. They are only used momentarily anyway. The rx is a Futaba 7ch and I'll only be using 3 most of the time so I don't think it will overload the BEC.

This can be an expensive hobby! Just don't tell my wife that. I keep bragging about how cheap electric ARF's are! She doesn't need to know about all the other stuff you have to buy ;)

UNNERSTAND THAT! When I decided to go flyin' I sold off a pretty large HW/Matchbox collection as well as several rc and remote wired cars so I had a pretty good piggy for starters.

I've always tried to have my hobbies pay for themselves so I may be restarting a couple of them.;-)

Fly Time
11-13-2007, 01:44 AM
I'm only considering more power as I don't know how the plane is going to be affected with the two extra servos.

All you need is more voltage. Cheapest way to go is an 8 cell NiMH. That will give you and extra 1.3 volts over the stock 7 cell. You can use the same wall charger I believe and no other mods are necessary. With new Rx, ESC and servos, it is possible that the net effect of your mods would be a reduction in weight in which case you got nothing to worry about. But that has never happened in the history of this hobby that I'm aware of :D

It turns out that the ESC doesn't incorporate BEC, so I'll be exchanging it for one that does.
Did they really substitute an ESC w/o BEC for an out of stock one that was supposed to have it??? Sure hope they are takin' care of you on that one!


The servos are micros so I don't expect too much extra current draw. They are only used momentarily anyway. The rx is a Futaba 7ch and I'll only be using 3 most of the time so I don't think it will overload the BEC.


I'm not sure about that. Not saying you are wrong - I just don't know how much current a servo at rest draws. I also don't know what happens if you exceed the max number of servos. Does the Rx quit? Does the whole ESC start smokin'??? Whatever happens, I'm sure it would only happen with your plane at least 100' off the ground! Murphy's law of model airplane flight.

I've always tried to have my hobbies pay for themselves....

Would like to figure that one out for myself! Most "hobbies" that fit that category are illegal! :roll:

cbatters
11-13-2007, 02:28 AM
Is 2409-18 the best BL choice for SuperCUb or would you be better off with a 2409-12 with larger - slower spinning prop?


Clint

antione
11-13-2007, 11:54 PM
I used a HXT 35 36c motor and the HT brushless mount for a SC before and a 10 X 6 prop and 35 amp esc, the plane was super fast and flew great. I'll find the web site where I got the stuff and post it latter for you.