Brushless motor in stock gearbox?

[boogienm]

Has anyone tried to use the Six-Series Brushless 2000Kv Motor (28mm) by E-flite in the stock gearbox. i understand the full swap with esc, bec and receiver. I have most of the parts to do this other than the motor. It would seem easier to me to do this proposed swap than change motor mount ect. Or would this be just too much motor for the Super cub LP. BTW i have had the same common problem with the ESC/Receiver failure in mid flight and am interested in upgrading.

[flydiver]

It's a tad lighter and a LOT more powerful.
www.e-fliterc.com/Products/Default.aspx?ProdID=EFLM2000

If you can find a pinion gear that works it should be a good match and a bit over the top. But, that's what that stick on the left is for.

[boogienm]

I'm going to explore the option and try to keep up the post. If anybody else wants to chime in i am more than happy to listen to ideas. Thanks

[flydiver]

The vast majority of people opt for outrunners to avoid the complexity and problems of gearboxes. They are more sophisticated. People that are familiar with them and have higher end GB can change the ratios to suit their purpose and prop sizes. If you just stay with the stock 3:1 that doesn't matter much. I don't know if the stock GB is up to that significant jump in power.

Did you notice this part?
[5x4 to 6x5.5 direct drive or 10x6 to 12x6 props with 2:1 to 3:1 gearbox]
If you stay 3:1 your effective KV is ~ 650 (low). You can swing a pretty big prop. Not many outrunners that would fit in the Cub can do that.....if you want to do that.

[boogienm]

I see your point on the gearbox complexity, I'm going to stay with the stock motor for a while and may still explore the inrunner option as an alternative. I did not see the parts you were describing on the bottom of the post but do understand the kv part. I'm new to the airplane world, most of my experience is with cars and CP Heli's. To me the gear reduction should make the motor run more efficient, but in looking at the parts of the stock gearbox more closely i think that the main gear would just turn on the spline the first time full power was applied. I don't have a LHS anymore and have to travel 2-4 hours to be able to match up parts. I have reservations about blindly buying parts i ultimately won't need. Thank you for your reply and insight, very helpfull

[flydiver]

The stock LP is good for 9-13A. It's fine at 9A, at 13A+ folks have variable success with the ESC. Frying is not uncommon. It was never designed for the lipo load.
The stock power plant is heavy. Going brushless/lighter makes CG issues. Going BIG brushless is common to deal with this.
Going to new electrics and keeping the stock motor runs against issues with brushless ESC-the majority of them being not terribly satisfactory.

[boogienm]

I currently have a Great Planes 35 C coming in for the brushed motor, im going to have to watch the LVC as i have read the min cut off is 2.75 v per cell. also a CC bec to power the receiver and Servos(Aileron mod). Also another quick question, has anyone powered the stock receiver from a bec and not used the esc portion. my preliminary test seems to work fine but without the esc from GP in yet i can't fully test my theory.

[ginginho]

Dec 13, 2010 20:24:43 GMT 1 flydiver said:

{Snipped}
Going to new electrics and keeping the stock motor runs against issues with brushless brushed ESC-the majority of them being not terribly satisfactory.

Corrected for the sake of accurate info, I'm not being picky, honest.

[boogienm]

I had figured it out. Thanks tho

[flydiver]

Thanks.
Can't help with that part of the project. I've not heard of anyone using an external BEC. You still end up relying on the LVC built into the ESC.

With the jumper pulled the LVC is 8.8-8.9v. A tad better than you indicated but still too low IMO.

[boogienm]

I am planing on using only the DSM2 portion of the stock unit by powering it externally(utilizing the BEC). By Installing an aftermarket ESC and BEC i hope to reduce the load on all the components and not overheat them again. Darn scary when the plan enters a death spiral because of thermal shutdown. If it works i will post pictures to help clarify my intentions and it may be a way to save some money on a DSM2 receiver for those interested. at the end of this little project i will have a fully stock Super Cub Lp and a very modified Super Cub LP .