[Fidd]

Sequences to operate this tool.

1. Go to ships clock, enter WP time top left [1] of tool.

To establish rpm for any specific speed:

2. enter speed with decimal value eg "6.3"
Select diesel sfc'd, electric sbmrg'd or electric sfc'd.
Select fwd or reverse and "no" unless flamed above default spd.
click on calculate and read off rpm required to achieve that speed.

To generate a battery report:
Enter Kah remaining [2]
Enter EOT order OR rpm
click on "refreh time" then "estimate" then "copy for wolfpack"
Bring up the text buffer and hit enter.

NB. ensure before clicking on estimate, that you have ticks entered on each element you wish to incorporate into the report.

Suggested uses: After the control room crew have measured the speed of the convoy, get them to pass you the convoy speed. Enter that speed and calculate to generate the rpm required. Obtain that rpm on diesel controls (less accurate) or set rpm 50 higher than requested rpm on diesel throttle scale, then set parallel/parallel and balance motor and battery voltage within 60V of each other by adjusting speed controller. When balanced, put motor direction switch from off to forward. This should prevent breakers from blowing. Adjust rpm with slow gentle movements of the speed controller until desired rpm is achieved, read from the e-motor shaft rotation gauge. This very accurate, enabling speed correct to less than 0.1 knot. As the diesels cool, backing off the speed controller may be required to maintain rpm. If a diesel order comes in, ensure you turn off the e-motor panel before advancing diesel throttles.

On the reporting side of things, this is most useful in terms of providing the captain hard information concerning how long the battery will last at a given EOT order or rpm. As this is decidedly non-linear as speed increases, it's hard to guestimate this without a tool like this, or tables.

I tend to report every 1kAh or 500Ah dependant on our speed. Faster speed, more frequent reports. In order to make the reports more useful, I enter the next Kah value, before the battery reduces to that value, watch the battery fall to that value, then create and send off the report when the Kah falls to that value. In the event there's a large speed change order made, or, the KAh is low, then I'll make reports when the new speed order is rung on the EOT especially if it FASTER!

The rpm's/speeds have been tested fairly thoroughly, so should be correct, especially diesel/surfaced I've generally found the rpm out-putted for a given speed to be more accurate than most tables. If you should fine that's wrong, please let us know?

The "Phase" relates to the battery switches. \ \ (phase 1) is series parallel, / \ (phase 2) is parallel parallel and / / (phase 3) is parallel series. All read left to right obviously!

This tool was written by Septimanien, not me, all I did was to help with translation from French to English and suggest a few features. I'm sure he'd enjoy any feeback, and would find even negative feedback constructive and useful?