flex shaft slips in driveshaft on a new twin genesis, reverse driveshaft?

[waterproof]

Hi.

After only 1-2 minute of runtime on my new genesis twin motors the left prop stop working.
When i went home i took out the driveshaft in the strut and when i put the flex shaft inn it just slips inside the driveshaft.

Here is some pics, think its because the flex shaft is to thin or not have enough edges where it flat?
Maby i need a new driveshaft also.


IMG_2815.jpgIMG_2816.jpgIMG_2817.jpgIMG_2827.jpg

Thanks for reply :)

[waterproof]

I took out both driveshafts and that With fault marked as number two dosnt look like the number one without fault.
Number 2 With problems has the edge slightly inside before it starts and gap in every corner.
Number two also got scratch outside that i could feel with my nail.

On the last pics you see both flex, number 1 works fine but it have a little gap almost at the edge, is this safe to use? The broken one is number two and it have less 4 edges.

image1.jpgimage3.jpgIMG_2839.jpg

[waterproof]

If you look at the pics in the middle in post nr 2 i wonder if something in the strut could lock or hold the driveshaft, so the flex shaft broke and grind the driveshaft?

The big question is if it help to mount a new driveshaft and flex shaft, or if the same will happen again.
Strange that the drive shaft have theas scratches outside?

[tlandauer]

Waterproof,
Much as i hate to make a fool of myself again, I like to say that the square end from No1 and 2 of the cables looked OK, at least with the pictures that you are supplying. As for the square hole in the shaft, can't tell, the angle is not the same and you need a REAL camera to have Macro capability to show if there is any abnormality.
having said that, if I were you I will replace all of the above, it is not a secure feeling when you know something might go wrong. I think the steel wires are harder than the shaft, so it is more likely the shaft's square hole is already rounded out by the slipping cable.
It is possible that in the beginning the cable is a bit under sized, I have had experiences with other situation.
It is better to go for the one piece flex cable/shaft that is most common here in the US. I can't advice you on exactly what you need to buy, because I don't know the diameter of the shaft and the bushings in the stingers as they are in metric , but if they are indeed 3/16" shaft and the corresponding bushings in the stingers are the same, all you need is to buy CW and CCW cables here and cut them to the desired length.
Hopefully that makes a little sense.

[waterproof]

Waterproof,
Much as i hate to make a fool of myself again, I like to say that the square end from No1 and 2 of the cables looked OK, at least with the pictures that you are supplying. As for the square hole in the shaft, can't tell, the angle is not the same and you need a REAL camera to have Macro capability to show if there is any abnormality.
having said that, if I were you I will replace all of the above, it is not a secure feeling when you know something might go wrong. I think the steel wires are harder than the shaft, so it is more likely the shaft's square hole is already rounded out by the slipping cable.
It is possible that in the beginning the cable is a bit under sized, I have had experiences with other situation.
It is better to go for the one piece flex cable/shaft that is most common here in the US. I can't advice you on exactly what you need to buy, because I don't know the diameter of the shaft and the bushings in the stingers as they are in metric , but if they are indeed 3/16" shaft and the corresponding bushings in the stingers are the same, all you need is to buy CW and CCW cables here and cut them to the desired length.
Hopefully that makes a little sense.

Hi.

Got a new flex shaft today and a driveshaft but i think its not tight enough, it not spinn around like the broken one but its not tight like i want it.

If i put one round with paper tape around the square side its been tighter, is it ok to do this or could something happen when the square side is taped?

Im going to convert to 3/16 later, but right now i just want to run it a few times since it brand new and this happen the first minute of runtime.
Could i take one round with tape around where its square or is it not a good idea?

You have right about that the metal inside the driveshaft is broken, flex shaft is maby less square.

I dont know if i want to try the new drive shaft and flex shaft because im afraid the same thing happen since it not tight enough together. And when its not tight enough the flex would more easy slip over and broke the drive shaft again..

[tlandauer]

Hi.

Got a new flex shaft today and a driveshaft but i think its not tight enough, it not spinn around like the broken one but its not tight like i want it.

If i put one round with paper tape around the square side its been tighter, is it ok to do this or could something happen when the square side is taped?

Im going to convert to 3/16 later, but right now i just want to run it a few times since it brand new and this happen the first minute of runtime.
Could i take one round with tape around where its square or is it not a good idea?

You have right about that the metal inside the driveshaft is broken, flex shaft is maby less square.

I dont know if i want to try the new drive shaft and flex shaft because im afraid the same thing happen since it not tight enough together. And when its not tight enough the flex would more easy slip over and broke the drive shaft again..

There will be some free play, I don't know how loose it is, also I don't know what is your expectation. But the shaft is supposed to be able to move in-and-out a tiny bit. One of the advantages of this system is that the shaft "free floats" a bit, no need to leave a gap between the drive dog and the strut/stinger.
You need to make sure that your drive shaft is not moving excessively "in-and-out" , this is determined by the correct placement of the bushing inside the stinger. Compare both of your drive shaft, see if the one that wasn't damaged moves less than the one that was damaged. The square end from the cable should be deep enough so that the "main body" of the square end is ENGAGED in the square hole of the shaft.

[waterproof]

Hi. When i mount the new driveshaft and flexshaft it would not fit! The stinger part with prop do not came long enough inn. Not with the old drive shaft and flex shaft eighter.
What is going on? Like i said it came rtr. Only thing that i have done is to secure it from leaking water and run it for one minute before the drive shaft on the left side been broken.
It came fitted out of the box. But now it would not get to close.
Without a flex shaft mounted the stinger fit. But if i try the old broken one or the new it not fit anymore!
Motor coupler seems fine. The flex shaft is longer out on the side with trouble. It have always be like that.

Both motors also seems to sit on the same posissions

[tlandauer]

I am afraid that I don't understand 100%, but let me ask you, may be the new cable is too long or too short? The shaft ( stinger part of prop) is the same, no?

[waterproof]

Hi. Sorry for my poor language.
Yes it seems like the flex should be shorter. Because the stinger with driveshaft fit without flex shaft.
The strange thing is that i have 3 flex shafts and every came to long out.
But i have mount it when the boat was new because i grease them.
But after the drive shaft got damaged after the first minute i cant get it to fit.

Right stinger do not fit on the left side with problem. But the left stinger fit on right.

How could the left side suddently have need for shorter flex shaft? It just so strange.

[tlandauer]

No, I don't mean it's your English, sorry, you are clear.
I am just as puzzled as you are. It is understandable that the new cable would be a bit on the long side for you to cut, but I don't understand the damaged one not fitting after the 1st run.
Again, check if there is any abnormalities with the bushings, is your shaft ( stinger prop part) moving strangely in and out?
I should not say any more as i have very little experience with this TFL set up, the only square cable I have is in my O.S. out board drive and that's a completely different animal.
Hopefullt someone else could offer some wisdom.

[waterproof]

No, I don't mean it's your English, sorry, you are clear.
I am just as puzzled as you are. It is understandable that the new cable would be a bit on the long side for you to cut, but I don't understand the damaged one not fitting after the 1st run.
Again, check if there is any abnormalities with the bushings, is your shaft ( stinger prop part) moving strangely in and out?
I should not say any more as i have very little experience with this TFL set up, the only square cable I have is in my O.S. out board drive and that's a completely different animal.
Hopefullt someone else could offer some wisdom.

Hi. Im happy for you trying to help me. I realy am.
Im so confused right now.
I payed 7000nok and that is the same as 900 dollar.
This boat is not worth it. It steal all of my time and almost money. I got the stinger on now, but it would not came off!
The plastic ring from the stinger shaft is stucked inside the stinger mount. I cant pull any harder because im afraid to damage the hull. How could i get it off? Its real stucked. Tryed to spray some light oil with no luck.

Im going to send it back and say that i must have the money back. I have used the smash shark last summer with no issues.
But this have a thon of issues..

[danielplace1962]

Are you absolutely certain you put the cables on the proper side when you had them out to grease them originally. You swap sides and they will fail immediately. They have a different wind from side to side. One is left hand wound and the other right hand. If you ran one the wrong way it may explain the immediate failure and length change your talking about.

Just guessing what could be wrong. Hard to trouble shoot sometimes when it isn't in front of you.

Just trying to understand what could be so wrong other than it just being another one of Hobby King's useless products they make. I have ordered things from them a few times and for the most part it was just junk that didn't work and was thrown straight in the garbage can. I am talking bottom of the barrel garbage.

[kevinpratt823]

It sounds like the square hole inside the shaft is damaged part of the way in, and not allowing the flex to go all the way into the shaft maybe....?
Can you take the shafts and flexes out and try to put them togethe? Does one side go in farther than the other? If the shaft was run backwards, I can imagine it might cause it to slip inside the shaft and damage it?

Sent from my SM-G920V using Tapatalk

[waterproof]

Hi. The shafts fit outside the boat.
I dont think the flex shafts was mounted wrong.
Right motor spin to right and the wires on the shaft pointing to right and are twisted the same way as the motor spin it. Same with left motor. It spins to left and wires are pointing to left and they are twisted the same direction as the motor spins it.

[waterproof]

I found the problem. The flex shaft is longer outside the hull on the left side with issue.
I think when its under use the flex shaft stretch a bit so its longer under load. Then it vibrate mutch more on this side and the drive shafts get broken.
This must be the problem?
Strange since every flex shafts is longer when i install them. Motor mounts looks like they are glued in the same posisions..