Micro Mogli motor/flexshaft question

[lincpimp]

Ok, so I have a micro mogli : http://www.toughracing.com/zc126d/in...products_id=13

It has a feigao 380 9s (4400kv) and a 432 octura prop. Speed is fine, but I bent the motor shaft earlier today when I was trying to figure out why I had excessive vibration. Turns out the stock coupler is WAY out of balance.

So I have a crapped motor (it happens) and I doubt that I can get the shaft straight, I will try.

My only other motor choice on hand is an aveox 28mm motor, 2000kv, and quite a bit longer than the 380s. The aveox is at least as long as a 380l can, so it should make more power and will have more torque. Plus it is 4 pole. Or I can order a new motor from Steven when I pick up some other parts that I need, only 32 bucks...

Now, I am currently running 3s with the 380s, but can run 4s with the aveox. Since I am happy with the speed right now, what prop would I go to with the slower spinning motor. Motor rpms will got down to 30k rpm from over 50k with the feigao... Big difference.

Also, I would like to replace the coupler. Not sure what diameter the flexshaft is, but the motor side needs to be 1/8" (3.17mm) to fit either motor.

I did get this boat used, and it does need some work on the strut and stuffing tube as it drags slightly once per revolution. This may have caused the shaft to weaken... Binding of any sort is bad... Mmmmkay.

So any help or advise (or criticism) will be greatly appreciated!

[lincpimp]

Looking at the OSE store this looks like the best bet in a coupler, hope it is not too big in diameter. I am thinking the shaft is .130, but it may be .150...

http://www.offshoreelectrics.com/pro...rod=ose-str-ci

Does anyone know how big these beasts are?

[lincpimp]

Just thinking... I run a pair of 3s lipos in parallel in this boat. I could go with a 6s esc and the mentioned aveox 2000kv motor and run those lipos in series. Higher voltage is better, and I am not adding weight...

[HOTWATER]

Cheesesteak!

[lincpimp]

Cheesesteak!

Missed the boat on this one...

[lincpimp]

So, I might as well pad my post count here... Just in case anyone is reading I will add some info.

Figured out the slight binding was between the prop shaft and the strut, specifically the bronze/whatever bearing surface. A few mins with fine valve lapping paste and the cordless drill, and voila, smooth spinning.

I also decided to try "unbending" the motor shaft... My previous experience with this has been less than successful, but the feigao motor shaft must be made of lead, bends very easily. If I keep this boat I may swap out to a medusa, or something with a stronger shaft.

Anyways, I have also decided to use a castle creations sidewinder esc to run this turd. Why? Cuase I have 5 of them, and 3 are not doing anything right now. So I removed the fins off the heatsink, and plan to epoxy a few tubes to the remaining flat al that is directly epoxied to the fets. I will use arctic silver epoxy. I will also waterproof the esc, or at lease make it water resistant...

And I am doing some custom paint work to the boat. Green, yellow, white and some silver accents. Kinda gonna have a tiki inspired theme. Not sure why, but that is what I found in the paint shop as old paint (I own an auto body shop) so free is free! Plus I have some stencils that look pretty good, I guess. We will see how it turns out.

Feel free to post whatever you want, you can even call me a doofus if you like.

[Rumdog]

got any vid of her running?

[lincpimp]

Not yet, all of the actually running I have done is shake down stuff, a few mins here and there. I will get some pics up in the next few days, and hope to have a vid soon.

[Rumdog]

Nice! I've seen vids of that little guy, and it looks like it handles awesome! Good luck, and looking forward to the pics

[lincpimp]

From my limited experience with the boat on the water it has a very responsive rudder, but only when it is moving at about 3mph or more. I ran it 1st with some sort of crap esc and 2 3s 1800mah lipos in parallel for 3600mah total. Not too bad, but it was a bit fast for the canal by my shop.

Took it to the pond a few days ago and ran it with the sidewinder on 1 2100mah 3s flightpower lipo. Much better in a larger area, and the sidewinder gave noticeably better throttle control. The boat did take on some water, but I think an improperly placed stuffing tube (not fully engaged to the strut) is the cause of that issue. (Damn used boats!) Plus the single pack was giving some balance issues... When I got it on plane it ran straight, but at 20mph or so it was pulling to the battery side quite a bit. Running a pair of packs will help with the balance issue, and some tweaking of the strut should get it running well. Also the esc was not watercooled and thermaled after 5mins... It does have some power, and the slight binding could have caused the heat issue. Plus pulling that 1 pack was causing some voltage drop, so that can account for the added heat as well. Should be back out next week with a watertight hull with a watercooled esc and the right battery setup. Plus the driveline is nice and smooth.

[Rumdog]

tyr some shrinkwrap between the strut and stuffing tube to waterproof it.

[lincpimp]

The way the strut fits on the transom mount precludes the use of shrink. But the transom end of the strut has a recess that appears to be there for the stuffing tube to slide inside, maybe 1/8-3/16 of an inch. The guy that setup the boat put the stuffing tube flush with the transom, and the other end floats in the motor mount extension tube. So I will break it free and move it a bit.

One question, what type/brand of epoxy should I use? Or can I get away with something like kitty hair to hold the transom end of the stuffing tube in place? I figured something with a thicker consistency would be better...