[PSUBS-MAILIST] Thruster Test

[Alan via Personal_Submersibles]

Just did the first test on my latest brushless thruster version.
I started with a Vetus bow thruster which is normally housed in a tunnel, but
to simplify things I am testing several different propellors without nozzles first.
I have a 10mm prop shaft & the various off the shelf props need either drilling
out or sleeves made to fit them.
   I was getting 38.5 lb. thrust from 1,152 Watts & 45 lb. off 1,694 Watts, which
is comparable with some commercial thrusters but not with others. Some 
manufacturers are quoting thrust per Watt figures I find hard to believe.
Will see how the other props work.
   Testing came to an end when the automatic pool cleaner (which I had just
moved to the end of the pool) came down & knocked my prop off while I was 
jotting down notes. First swim of the summer finding the shaft pin. The prop
was held in place more or less by the force of the prop thrust & a tight fit.
Picture below is from left to right; load cell mounted on the vertical stationary
side of black test jig, motor controller, 48V rectifier with oil compensator on
top, grey load cel display, servo tester to control speed & laptop with Vesc Tool
program displaying data. 
The oil compensator is just for the testing, a much smaller & different system
will be on the sub.
Alan
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image1.JPG
Type: image/jpeg
Size: 518427 bytes
Desc: not available
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20181205/ca0b3166/attachment-0001.jpe>
-------------- next part --------------