Yes sir, a bike chain sprocket. You could set it up with a chain drive, but I went the easy route with a PVC plumbing fitting that I grooved with a Dremel tool to fit the sprocket teeth.
300 RPM 24 VDC geared bicycle motor, speed controlled to 150RPM. Motor was ~$50 on Ebay, 500W 24VDC power supply $38 and speed controller $17 on Amazon. Custom coupling.
https://www.ebay.com/itm/133596475776...
@day_trippr thanks for the info. I'll put both HLT return and BK whirlpool low, same level as exit ports. The whirlpool port on my present BK is at the same level as the thermometer, ~6". I have to throttle back the whirlpool pump to prevent splashing over the side of the kettle. So, hoping...
I'm planning to upgrade my 15 gal HLT and 20 gal BK. Just upgraded my mash tun to a 20 gal Spike V4. Very happy with it, wish I'd have done it 5 years ago.
My question is, what are the best locations for the return port in the HLT and the whirlpool port in the BK?
Discharge ports will be +1.5"...
The specific gravity of fermenting wort can be calculated using your current refractometer measurement (in Brix) and the original gravity:
https://www.northernbrewer.com/pages/refractometer-calculator
I live and brew in the Bay Area of California. On a couple occasions I placed an order to MB on a weekday morning and it was delivered that same evening. No issues with MB for me.