mysterydip, you're doing a lot of posting and not listening to some of these very good answers.
First. No, lifetime buys are not always a tough problem. While they can be tough, consumer grade electronics have to be the best product to predict lifetime buys on due to clear end of life and good data on mean time to failure.
Second. Let's do some math. Let's assume a 30 year operation. There are 48 of this sub planned. Let's say for some reason they go through 3 a year. At $30 each, we're looking at $130k to outfit the entire fleet of subs for their operational lifetime. Or, we could buy about 3.5 of the existing joystick, not even enough to outfit the 4 subs that are already in operation.
Lastly, it is likely that a 3rd party would take over the manufacture of these devices when they end of life anyway. It's a popular consumer electronic after all. The government would just buy a bunch then, reducing lifetime warehouse costs and getting better data to predict the lifetime buy.
It's probably also worth comparing to the cost of a bespoke solution. If it takes two engineers six months to design and test, you'll have spent more on their salaries alone than on your projected lifetime buy (which itself doesn't even account for any bulk discount).
Sorry, I didn't mean to imply it's always a problem, or even in this specific case. Just that it can be, something for people to think about.
The problem comes when you start going through 3 a year, but then say 5 years down the road you start going through 15 a year. There could be a premature wear issue, some bug, an update from a related system, whatever. But you can't always plan for those, and it can come back to bite you. And whomever has the inventory at that time can have quite a markup.
For what it's worth, I think this controller idea is excellent.
First. No, lifetime buys are not always a tough problem. While they can be tough, consumer grade electronics have to be the best product to predict lifetime buys on due to clear end of life and good data on mean time to failure.
Second. Let's do some math. Let's assume a 30 year operation. There are 48 of this sub planned. Let's say for some reason they go through 3 a year. At $30 each, we're looking at $130k to outfit the entire fleet of subs for their operational lifetime. Or, we could buy about 3.5 of the existing joystick, not even enough to outfit the 4 subs that are already in operation.
Lastly, it is likely that a 3rd party would take over the manufacture of these devices when they end of life anyway. It's a popular consumer electronic after all. The government would just buy a bunch then, reducing lifetime warehouse costs and getting better data to predict the lifetime buy.