I have built and run a kehrer Pibber. " water jets, goes like stink. Thought i would pass on a problem i have with jet drives/Reversing.
First of, if the motors are run in reverse, nought happens.
To get it to go in reverse a "damn" is pulled up, blocking the outlet, and forcing water out through a "hole" in the bottom of the drive unit, torwards the bow. hence reverse. There in lies an exciting problem. if you chuck it in to reverse when the boat has any kind of forward momentum, the bow "dives". Now while this can be fun to watch, it doesnt do the boat any favours. She takes on water.
I have just bought a new transmitter that is programable and i am going to look into mixing motors and the reversing servos so that if the reverse is used the motors are cut.
The other thing i am going to look into is when i bought the kit i ordered reversing buckets. Now for some reason known only to my younger self i never fitted these. Just used the "damns" that came with the jet units.
wether these will make any difference i dont know. I will try them out, Very CAUTIOUSLY. can get expensive otherwise.
love yer Cad skills, wish i couls afford inventor. just use Turbo Cad. not quite so easy to use.
Colin