Warpatroller wrote:Hmm, that is a strange size for the WTC diameter 37mm (1 15/32"). I am going to guess maybe it is 1.5" even, and that must be the outside diameter. Is the inside diameter 1 3/8"?
That is going to be the exact outside and inside diameter of the WTC for my project.
I looked at the SWM page and that 300-sized motor appears to me to be 15/16" or the same diameter as a Quarter. Your old Mabuchi motor looks like a speed 250 size motor, which is what I am considering for my WTC. These 250 motors typically spin 9722 RPM @ 5V The SWM 300 motor claims to spin 5400 RPM @ 5V. Supposedly the lower RPM should be better for a boat or sub, and not need a reduction gear setup.
I was trying to find out the diameter to see if i'd have sufficient room to clear a pushrod both above and below the motor in my tube. I see you put a bend in your pushrods to get them closer together to be able to pass through your seals.
My project will be a small boat also, similar in size to yours. Thanks for the close up photo.
Warpatroller wrote:The two blue micro-servos your using, did you get them from Caswell? They look like they might be the ones shown on his site. Maybe you got your propshaft seal there as well?
Your right about the HS-50 availability. There are also the GWS Pico servos, which are even smaller than the HS-50. What I don't like about the HS-50 is the cost of those units, $22 each. Pico's are $14 each and Caswell's are $8.
By the way, have you had a chance to run your Alfa with the new SWM motor? If so, how does it perform in your boat?
Warpatroller wrote:Why is the motor not running freely in the WTC? What is the source of the friction? Is it because of your fuel tubing shaft linkage?
What is the total voltage and mAh capacity of your battery pack?
I don't think an electric motor really needs to be "broken in", like an internal combustion engine does.
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