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56" tfl genius chime walking

Old 08-08-2019, 04:59 PM
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Eazy1970
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Default 56" tfl genius chine walking

Hi there, I'm new here, like to say hi to everyone.
I have a bit of a problem, I have a twin motor 56" full carbon fiber cat hull running on 12s. The problem I am having is that it chime walks at full throttle, but its not going as fast as it should. If I were to guess 60 to 70 mph. I'm afraid to add more power cause, I already crashed due to the chime walking.
Any idea on how to get rid of this chine walking?
thanks ahead of time.

Last edited by Eazy1970; 08-08-2019 at 05:28 PM.
Old 08-12-2019, 11:06 AM
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Cool

We need more information to even begin to help.

1- exactly what motors
2- exactly what props
3- do the props rotate inwards or outwards
4- where is the CG
5- a photo of the transom from the side
6- how far above the sponson bottom is the strut bottom
7- place the hull on a flat table - are the struts parallel with the table


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Old 08-12-2019, 04:03 PM
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Eazy1970
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Originally Posted by Got RPM View Post
We need more information to even begin to help.

1- exactly what motors
2- exactly what props
3- do the props rotate inwards or outwards
4- where is the CG
5- a photo of the transom from the side
6- how far above the sponson bottom is the strut bottom
7- place the hull on a flat table - are the struts parallel with the table


.
1- 5684 1000kv
2- not sure what props I will look into it
3- props rotate outwards
4- never messured it but its towards the rear
5- i will once I'm back at the cottage
6- not sure what that means i will look it up (sorry)
7- I will on my next trip to the cottage

Thanks for your input
Old 08-12-2019, 07:09 PM
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What use are you putting the boat to, because your setup is pretty extreme. The motor Kv is really too high for most uses on 12S and many motors will not tolerate the rpm your setup produces. It is most suited for a few high speed passes then back to the beach to cool off. If you are expecting long run times you may be disappointed. Where did you get the recommendations for your build?

Prop choice is very important, with this setup going just a little too big can burn things up. Too small and you will not reach top speeds or efficiency.

The CG position is very critical to a cat’s performance, just 1/2” to 1” fore or aft can make a noticeable difference. It is expressed as the percent of the hull length starting at the transom, not the extreme back end of the boat. Most cats run between 31% and 35% depending on the hull and speed.

Strut adjustment is also very critical to good performance, both in the height above the bottom and the angle with the bottom.

What batteries are you using - brand, capacity, C rating, 2P or 3P?

As you can see, tuning a cat can be a challenge. I’ve been running FE cats for almost 30 years and I’m still learning as power and hulls continue to change.

Last edited by Got RPM; 08-12-2019 at 07:18 PM.
Old 08-12-2019, 07:13 PM
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*******

Last edited by Got RPM; 08-12-2019 at 07:16 PM.
Old 08-13-2019, 05:26 AM
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Eazy1970
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The batteries are gen ace 100c 7500mah hv, i believe that they are 2p, as for run time I know that it wasn't going to be long.
Everything seems to be very happy when it comes to the electronic side of things, after about 5 to 6 min of running it hard meaning full throttle pulls, batteries, ecs,and motors are barely warm.
Sandy at tfl North America had set me up with everything but servo batteries and radio.
Old 08-16-2019, 09:50 AM
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Something here makes no sense. Running for 6 minutes means an average of just 65 amps drawn per motor, hardly enough to get much speed out of a boat that size. That explains why nothing is hot. Either you were idling around most of the run or you grossly overestimated your run time. Without knowing the total capacity of the packs per motor (7500 mAh or 15,000 mAh), the props used, the CG location or the strut settings there is no way I can diagnose the problem.



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Old 08-18-2019, 05:56 AM
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Run time was easley 5 minutes minimum, the timing in the esc is only set to 3 degrees advance with a 3.5v per cell cutoff.
https://www.instagram.com/p/BywQodyFsem/?igshid=1elk1xsvjfdpf
Here is a video link to the boat running.
the batteries are 7500mah hv 4.3 volts per cell.
Once I figure out the chine walk I feel I do need props that are more aggressive.
I also talked to the Sandy at tfl, he said to set the struts to negative 1 to 2 degrees.

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