MTB Tenders

[dia]

Has anyone tried to build and use MTB tenders? I have yet to run into a case where I would use them, but they seem like a great idea and I'd like to try them when I play larger nations. What's the construction time on these MTBs, because it seems like 6 months would too late to participate in an invasion, especially later game invasions.

[polygon]

I haven't built tenders but I've actually gotten a whole bunch of mileage from MTBs in my current France game. Austria tried to invade Corsica and repeatedly ran into MTBs, taking about a dozen torpedo hits over the course of the war and losing a couple ships. Coastal batteries and MTBs also have radar now which is super useful.