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[budgie]

Hi Everyone,


I built a Speedline 1:16th severn several years ago. It has sat on the stairs for a number of years until last week when i decided the kids are old enough to take the helm.
I had a couple of test runs before fully Finished with all the railings/fittings and i got a very good scale speed and water flow out the stern via water scoops.
Fast Forward 8 or so years and the scale speed and the water flow no where near the same.
The batteries were left untouched for 8 years as well.
I have charged and recycled maybe 4 this last week without any improvement in performance.
By my reckoning even with the extra weight of the finishing touches since the last time i had it water bourne the flow through and out the water scoops should be the same even if the speed reduced.
So i am thinking the batteries must not be providing the correct voltage?
They are both 12v 4600mah and the props 35mm 3 blade.
When fully charged the meter reads 12.4v on one and around 14.2v on the other.
Any ideas if new batteries are needed?

[grendel]

the 12.4 is still fairly flat after charging, so will need replacing, the 14.2 sounds ok, but may be discharging faster than it should.

[Ralph]

Try checking the voltage when the batteries are under load (car brake light bulb, spare motor etc - anything that'll draw a reasonable current).  A dud cell can show the expected voltage without a load but it plummets when it's got to do a bit of work.

[coch y bonddu]

Shafts out and regrease would be a good idea and defo a pair of new batts




Dave

[budgie]

Thanks for the help guys!
Thats exactly what i thought, batteries are not giving the required power.
Lacking the whine of full power.
I will get on to the component shop and order up a pair of new ones.


Thanks again

[BrianB6]

After that amount of time I suggest cleaning all the grease / oil from the prop tube and replacing with new.   I didn't and my Cervia sank in the middle of the lake.