Can't solve the vibration!! Need some help

[bikergreen]

So I have a DF mini Storm which was my first build and I only have one issue I can't solve. There is something going on in the driveline which is causing a very annoying sound and some vibration. I have tried it with and without the teflon liner with no real change. It sounds like a bad bearing to me and maybe it is, but the motor was new when I got it and runs fine when not connected to the flex. That being said the first collet I had was badly out of balance and could have caused some damage to a bearing. There is some for and aft play in the shaft and a barely noticable amount of side to side play.

Check out the vid and let me know what you think

Thanks

http://s732.photobucket.com/albums/ww323/bikergreen/?action=view&current=2AFB4652-9BA6-47FA-BDCF-1F1FECC3968E-61276-00000B092242E2B7_zpsa7eede47.mp4

[photohoward1]

The shaft is whipping in the stuffing tube. Is the tube sized correctly for the cable? also is there any bend in the tube? Without it it will whip.

[iridebikes247]

Does it make noise like that when in the water? Might just need load but not 100%. Also when you run the boat like that touch the strut and also stuffing tube see which is heating up the most!

[Fluid]

Never ever run a boat at near full throttle out of the water! Forget about your "problem", it isn't one. Or at least it wasn't until you tried a "bench test". Under load the cable will not whip and the noise will not be a problem. This is a typical newbie issue and is posted about often. Listen and learn grasshopper.


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[bikergreen]

The shaft is whipping in the stuffing tube. Is the tube sized correctly for the cable? also is there any bend in the tube? Without it it will whip.

That makes sense and I did wonder about that - there is only a slight bend in the stuffing tube and its near the transom so I could see that being the issue. Certainly what I that was happening but didn't know exactly why. The tube sizing is all correct - thanks for the info, I may have to pull the stuffing tube and try a different configuration.

[bikergreen]

Never ever run a boat at near full throttle out of the water! Forget about your "problem", it isn't one. Or at least it wasn't until you tried a "bench test". Under load the cable will not whip and the noise will not be a problem. This is a typical newbie issue and is posted about often. Listen and learn grasshopper.


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I have seen those posts for sure! I didn't go past 50% throttle in that vid and only bench tested it to demonstrate the sound. I didn't bench test it before its first run in the water and that is when I first heard the noise. It makes exactly the same sound when its in the water under load and has since the first time it was wet.

[bikergreen]

The fact that it happens under load in the water is what makes me think its a bearing in the motor. I don't have another motor to try at the moment unfortunately.

[RacerX]

Grease the flexy and stut. ALOT!!! at first. Keep stuffin the grease in the tube and turn the flexy as you insert it. That will help. Free run the motor without flex and listen to bearings.

[TristanJones]

check the motor to end of stuffing tube alignment. failing that my $$ are on bearing.

[bikergreen]

Grease the flexy and stut. ALOT!!! at first. Keep stuffin the grease in the tube and turn the flexy as you insert it. That will help. Free run the motor without flex and listen to bearings.

I have done all of that already and it didn't solve it - I have those tricks dialed as its not my first boat, just my first build.

[bikergreen]

check the motor to end of stuffing tube alignment. failing that my $$ are on bearing.

I'm thinking the same - wanted to try a different motor anyway so I might just make that happen sooner to help me trouble shoot.

[lenny]

Hi,
What is the setup and what cells are you using with it ?
Sounds like a motor bearing to me,
Try lubing the bearings with a little oil on the front and back shaft of the motor.
Than just run the motor very slow to work it in some,
Now do a couple test runs and work up to high speed.

[ray schrauwen]

This is the answer to your problem...

If it makes this noise in the water too it can be because the boat is so light compared to a 29"++ boat that sits deeper in the water to dampen the sound

The only other reasons are slight mis-alignment of motor to shaft you stuffing tube has no bend as already stated above too. The coupler you are using is a possible source also.

It could be one or more of the above but, I'll say for 99% certain that it ISN'T the motor bearings.

Never ever run a boat at near full throttle out of the water! Forget about your "problem", it isn't one. Or at least it wasn't until you tried a "bench test". Under load the cable will not whip and the noise will not be a problem. This is a typical newbie issue and is posted about often. Listen and learn grasshopper.


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