Thursday, July 13, 2017

Re: [Electric Boats] Electric Drill Powered Dinghy Propulsion

 

Hi Ahmet,


I've made a number of changes (more to come, I'm sure).
The stainless steel 5/16 inch threaded rod has been replaced with 3/8 inch aluminum rod - much stiffer, cheaper and lighter. The tube coupling has been replaced with with a u-joint:


45 degrees is the max for the u-joint so the 45 degree PVC elbow was heated and bent to about 40 degrees - much better for handling general PVC bendiness. I'll likely stiffen the 3-foot PVC shaft with a sheath of fiberglass.

Lost the prop during the last sea trial so I've ordered some "real" props for future testing.


https://www.amazon.com/ MotorGuide-propellers- Machette-III-black/dp/ B001HC6YKA/ref=sr_1_18?ie= UTF8&qid=1499908789&sr=8-18& keywords=trolling+motor+props


I haven't measured speed over ground yet - just estimating.

 

Fortunately, the currents are tidal. I'm hoping soon to retire and not be on any sort of schedule, so I'll just wait for a favorable current.  :-) 


Might be difficult to get good comparison data for straight shaft vs. 40/45 degree u-joint angle efficiency. I don't have any way to measure the current draw on the cordless drill to plot against speed. There's definitely some additional friction with the u-joint.




 


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