My Ultrex 80 is pushing 5yrs old and has had allot of learning bumps and bruises, while at slow speeds vibration isn't "bad" anything higher then 6 vibrating gets bad, sharp turns also vibrate bad.

Speed seems about same in the past maybe .2mph slower then new.

like 2.9 from 3.1mph

Spot lock seems to be the smoothest.

I just cleaned the prop shaft at start of season and this isn't a new issue, been going on for a year or two.  Do the blades get unbalanced?

Any thoughts?

 

Thanks for any guidance.

yes, the blades can get chipped and the edges can roll over on them, just like a kitchen knife.  You can check that just by looking at them and it can start to cause wobble.  If its just a rolled edge you can hit it with a fine file or a tough nail file to take the roll off of it.  Or, they are cheap enough to just buy a new prop and keep the old one as a spare (always keep a spare).

 

If you fish around weeds a lot, the weedless wedge version is awesome.  You lose a little top end speed, but I'm guessing you're not using the TM for primary propulsion anyway.

Perhaps check the unit's mounting hardware to the deck for tightness.

Check the TM prop shaft itself, might be bent.

A little can make a big difference.

Damaged prop blade is the easiest to see & replace.

Finally why are you concerned with your TM's top 'speed' ?

Older batteries can slow you down.

A-Jay

8 minutes ago, A-Jay said:

Perhaps check the unit's mounting hardware to the deck for tightness.

Check the TM shaft itself, might be bent.

A little can make a big difference.

Damaged prop blade is the easiest to see & replace.

Finally why are you concerned with your TM's top 'speed' ?

Older batteries can slow you down.

A-Jay

The shaft is some type of fiber and straight from what I can tell.

I do have a weedless version I am going to check it tonight, looking at a new one I recall the u shapre on the one blade and I think mine is missing.

Mainly if my batteries are going why I am concerned about speed.

 

6 minutes ago, PABASS said:

The shaft is some type of fiber and straight from what I can tell.

I do have a weedless version I am going to check it tonight, looking at a new one I recall the u shapre on the one blade and I think mine is missing.

Mainly if my batteries are going why I am concerned about speed.

 

Yup ~ 

I edited my OP,

I was thinking perhaps the TM PROP Shaft might be a little bent . . .

A-Jay

Replace the shear pin, even if it looks pretty straight, a slight bend can create a blade wobble. They are cheap off Amazon/Ebay.

22 hours ago, Junger said:

Replace the shear pin, even if it looks pretty straight, a slight bend can create a blade wobble. They are cheap off Amazon/Ebay.

While I didn't replace I took off the blade and leveled out the shear pin and its running much better, I also tighten the nut a bit more and seems to be much better!

Thx for all the responses!