Minimono Upgrade Drive Shaft DIY

[gyrotron]

No problem, let me know if you have anymore questions. As far as cutting the flex shaft goes, I used a dremel with a cutting circle on it. I didn't solder the end that I cut as I didn't feel the need to but you could if you wanted to.

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What is the overall length of the flex shaft?

[yoffer]

I'm not sure, I just measured what needed from the stock wire drive and then I cut 2 inches more so I test fit it and from there I cut small sections off until it fit perfectly

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[Sobie2]

What motor for upgraded minimono?

I am upgrading my minimono with the .098 shaft, prop, and either the seaking 35a or 60a esc. The 60a esc can run 4s battery if I can find one that fits. Either esc and prop and driveshaft is $100. I am very new to the lipo thing. So I am looking for suggestions of an upgraded motor. Can the stocker run 4s? Or is there a drop in motor that is better than the stock one for 3s?

I am interested in really spending less than $60 on a motor.

Thx,
Sobie2

[boogityman]

I'm fairly new to this game as well but from my experience working with the Mini Rio there's a fine line between fast & fun and fast & constantly flipping, so I would watch out with that combination. That said, I think you will have difficulty finding a 4s that fits... at least one that'll give you decent run times anyways. I cram a bigger 3s in there to be able to keep it out there longer so its a tradeoff. I have still yet to rebuild mine with this shaft upgrade but am considering using a 3200kv outrunner I have laying around, but that would give me 35k rpm unloaded so its on the higher end of things. If you managed to cram a 4s in there its my understanding that you wouldn't want to put much more than a 2200kv motor on there.

Anyways just my 2 cents

[USMC247365]

Awesome advise

All, new to the boating world, last time I played with toys it was in the 80's. I have been doing alot of getting shot at and barely made it back home. I picked up RC's as a way of decompressing and it worked, but it is in depth to say the least. I bought the minimono and it striped the coupler and sucked as bad as you all said it did. I tried this drive upgrade and not only did it haul %ss but it is going to be my pet project. I also got my hands on a Spartan, I love the fact that you guys have answers for every situation, I am happy to be home, God Bless the US and RC I am obsessed. Please let me know tha best battery setup for the Spartan....

[USMC247365]

I took advice and spent a little on upgrade ESc's and put the Lipo power behind it. I truely think that you have to listen to the posts, modify yours, and get some.... As I am a Combat Water Survival instructor I do swim after my flips... and I caught 2 pompanos last night and got diner and a movie..... You guys are AWESOME... Thankx again

[Mr Camil]

Thinking about doing this but completely new to rc boats. What glue would you guys recommend?

[MiniMorris]

How did you drill out the tube holder? It seems there's no way to get a drill bit in there? Also, did you use just regular epoxy to secure the new tube? Thanks

[MAMBA2200]

Grab it with pliers and twist it back and forth it will break loose

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[MiniMorris]

Grab it with pliers and twist it back and forth it will break loose

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So you break out the tube holder, drill it, then glue it back in? What glue should I use?

[tlandauer]

MiniMoris,
Since you are getting excellent advice already, I am not trying to confuse the way you want to fix it, but in your other thread, you said the motor is not center/straight when run at low RPM, you mentioned vibration. To me it seems that there can be two issues, one is mis-alignment, the other is the motor is damaged, the shaft is not straight.
If the motor is good, you should be able to tell if it is aligned with the stuffing tube , the reason I ask is that you only mentioned about this observation when the motor is running.
IMO, a bit of mis-alignment would not cause vibration where as if the motor shaft is damaged/bent would cause some vibration. Granted it is unusual for a shaft to be "bent of out of shape" so to speak, may be that the motor wasn't assembled right to begin with. You also mensioned Not centered: are you saying the shaft doesn't look centered in relationship to the stuffing tube or it just doesn't look centered on the motor by itself?
I would examine all possible causes before doing surgery on the stuffing tube, this is just my opinion if I were faced with this problem, in no way am I putting other's advice down, this being the New Year, last thing I want is misunderstanding.
Cheers!

[tlandauer]

How is your coupler? is it machined correctly? These aluminum things are cheaply made, if itself is out of round, then you don't stand a chance.

[MiniMorris]

MiniMoris,
Since you are getting excellent advice already, I am not trying to confuse the way you want to fix it, but in your other thread, you said the motor is not center/straight when run at low RPM, you mentioned vibration. To me it seems that there can be two issues, one is mis-alignment, the other is the motor is damaged, the shaft is not straight.
If the motor is good, you should be able to tell if it is aligned with the stuffing tube , the reason I ask is that you only mentioned about this observation when the motor is running.
IMO, a bit of mis-alignment would not cause vibration where as if the motor shaft is damaged/bent would cause some vibration. Granted it is unusual for a shaft to be "bent of out of shape" so to speak, may be that the motor wasn't assembled right to begin with. You also mensioned Not centered: are you saying the shaft doesn't look centered in relationship to the stuffing tube or it just doesn't look centered on the motor by itself?
I would examine all possible causes before doing surgery on the stuffing tube, this is just my opinion if I were faced with this problem, in no way am I putting other's advice down, this being the New Year, last thing I want is misunderstanding.
Cheers!

Well, to clarify the motor shaft is straight it's when I put the coupler on motor, if you look at the end of the coupler where the prop shaft attaches you can tell, at low rpm, the coupler isn't on straight be because if you hold a nail against it, the nail will vibrate and bounce, where as it is smooth on the motor shaft side of the coupler. It looks as the motor shaft is straight inline with the stuffing tube. Also, the stuffing tube surgery is so I could use a flex shaft and not have to lose $20 in parts (a wire shaft, prop, prop nut.) everytime a grub screw backs out...... Which is every time it gets put in the water for me.

[MAMBA2200]

those stock couplers are made out of a very soft metal the set screws are junk i tossed mine never used it if you want it i will send it to you

[MiniMorris]

How is your coupler? is it machined correctly? These aluminum things are cheaply made, if itself is out of round, then you don't stand a chance.

Umm ... Well ima newb to the whole boat thing so I'm not sure, it looks alright?