Bow Thruster info update
On my 2000 MS 390, I spoke to Imtra, and finally got someone who knew about our brand.
In 2000 they installed as standard SP75 two 4 bladed 7.5 hp thrusters, which the manufacturer later updated to SE 85 (8.4hp). Also some first owner purchasers had installed more powerful upgrade thrusters when their boat was being built.
Imtra offers an upgrade kit 7-9999 that converts the 4 straight blade props to the new and improved 5 curved blade props. What a difference it makes in noise when operating, as well as what I think is superior sideways thrust.
The kit comes with 2 props, adapters, pins, washers...everything you need to upgrade. When my trawler was out of water doing the bottom, I installed the kit taking less than 30 mins to do. List price was a bit pricey at $320, but Defender had the kit for $215. Converting the touch pad controls to the toggle control was also money well spent, as it is much easier to use. (Imtra has a kit for our old style touch pad to convert using same hole for new toggle model.)