justin_le wrote: ↑
Feb 07, 2018 11:35 pm
Oh man, I have SOOO many interesting new tests on Statorade from the last 3-4 months of lab work that I need to share here. But none of them revisiting the drag vs. temperature data, since that was pretty definitive match of reduced viscosity and drag with increasing temperatures.
https://endless-sphere.com/forums/viewt ... 8#p1107308
If you are seeing the opposite effect, more drag when the motor is hot, then there must be something else at play in your system. Have you quantified the no load current draw of your motor when it is hot vs cool?
The fact that you also report hearing sounds from the motor when it is warm further hints to a purely mechanical effect and not one from fluid viscosity.
Thanks for the reply Justin!
And so awesome that this is still being tested by you!
Well, I do hope it's something up with my setup rather than an issue with FF causing increased drag with heat. The strange thing is though, that I see this same behaviour on 3 motors I'm using FF in.
That being said...the one thing these 3 motors have in common is that they are open (vented) to the elements. Two have forced air flow through them (Leaf '1500W / HS4080) and one just has a drilled side cover on one side ('1000W Golden motor, 9C clone).
I'm currently putting together a MXUS 3K for an Alpha build which also has FF added and will also have hubsinks. When I was 'carefully' adding the FF with the syringe I had already added about 6ml when the resistance on the plunger suddenly dropped and the whole 10ml went in.
Oh well...at least it will have the best possible thermal bridge which is just as well since I plan on pushing about 10KW peak through the thing.
All that to say....I will soon have 4 motors with FF. 3 vented and 1 not, so if it's somehow the venting causing the drag to increase, I should know soon enough.