Adding ailerons to bnf SC

[mybad]

OK. I'm confused. Perhaps I'm reading too many posts talking about different versions of the plane and stock vs scratch built.

I have the BNF. The ESC/receiver has a port for ailerons. Can I just buy two more servos that came with the bnf and be done with it?

Are the brownout problems due to off-brand servos that take too much power?

If I CAN'T do this, then why is there an aileron port?

What do I really need to upgrade my bnf to ailerons? I will keep the stock motor

[iflyforfun]

Sure you can!!!! If you are willing to take that chance!!!!
Thats how I started out!!!! I did the aielron mod and used 2 micro servos from HK and hooked them to the Aielron channel on the stock RX. Of course you must then move the rudder(right now that should be plugged into the Aielron channel) over to the rudder channel!!

It worked fine for me for tons of flights and I never had a brownout!! The fact of the matter is that you are pushing the capabilities of the ALL IN ONE ESC/Bec

Maby another member knows the exact technical specification for the stock Esc/bec.
I think flydiver has mentioned around 18amps for the Esc? Not sure about the bec???

It all comes down to this, its a chance and you MAY get away with it like lots of other members and I have. Or, you may loose your plane. ;D

[mybad]

Sure don't want to lose the plane, but don't want to throw out the baby with the bathwater either. That's why I was wondering what really HAS to be done vs what would be nice to do.

Sure is confusing

Do people lose their planes simply adding two additional servos of the same kind? If so, then it seems like a defective product?

[iflyforfun]

I think it's a great question. I would do it!!!! This is based on my limited experience and most importantly my short amount of time on this forum.

Other members like Dill,ging and flydiver may have a different perspective. They have been around the block a few times. Wait and see if they post or send them a PM.

[flydiver]

I'm not familiar with the BNF ESC. No one knows their true specs.

I suspect in their usual manner Horizon 'cut corners'. The part that runs the servos is the BEC portion. The AMP draw portion is not the critical component for the servos. It IS for the MOTOR.

If the BEC 'fails' due to overload then you get the dreaded brown out and everything goes down.
To know if you are overloading the BEC you need to know the amp capability of the BEC (good luck-Horizon NEVER gives that info on RTF equipment) and the draw of the servos. I have no idea what the stock servos draw or even what they actually are. The cheap ones (9gm size for $3-4) everyone likes from Hobby King or HeadsUpRC draw about 2x what a Hitec HS-55 does. If I were a gambling man I'd put in the HS-55. You really won't use the rudder much anyway, it's almost worthless on a flat wing/aileroned Cub so you probably won't be stressing the BEC too much. My guess is it's a 1A and good for 2 servos-but that IS a guess.

Note: ran across this today by fortuitous chance.
secure.hobbyzone.com/itemmultimedia/HZ/HBZ7380/SuperCubLPUpgradeInstructions.pdf

It's the instructions you were asking about. It downloaded 'odd' for me and I had to rename it and add the [pdf] ending for it to open right in case you have problems.

[tattooist]

i have added ailerons to mine i used 2 micro servo's with a y harness and it has worked for me with no worries i fly at high altitude all the time with a cam on board and the stock receiver works fine for me

[wattman]

WHAT , I did not know there could be a problem ?
I added a wing that I already had added ailerons to with two small servos , and put it on my new DSM RTF Super Cub , just plugged the aileron servos Y connection in the Receiver and moved the rudder servo to rudder plug in . I did have to reverse the aileron switch on the transmitter .
I have been flying the plane a LOT , in fact it stays in my van [ but not in hot weather ] all of the time , I just bring out my transmitter and lipos and go fly .
I was not aware that there could be a problem , dumb luck I suppose . Lucky so far .

[flydiver]

People get away with stuff a lot, sometimes for a very long time. I did, 4 cheap servos, cheap ESC with low rated linear BEC.
back then I didn't even know what a linear BEC was, did, or why I should care.
It changes your outlook a little when you watch you plane go straight down from 200 feet, no control at all, and literally bouncy back up 10 feet. In my case a 4-cell LiFe (A123) battery pack (steel cans) tried to go through a $90 Mega motor to the serious detriment of both.
WHA happened?!?!

I had flown that exact same power package well over a dozen times with no problem. My buddy didn't believe me about BEC overload condition (too many servos, not enough BEC support) until he watched his new balsa plane roll over on take off and auger in, no response to TX at all.

Both of us were flying 72MHz. 2.4GHz Spektrum is worse, it has brown out.