Hello @deadwood, welcome to the Forum!
I have been flying the the SP140 with a light Trike (AirOne Unique Single) a couple of times now.
The real world weight of the SP140 including the large battery and Dudek harness - ready to fly, but without wing and rescue is 35,1 kg / around 77 lbs. The AirOne is 18 kg / 40 lbs and the Rescue adds another 2.5 kg / 5 lbs => 123 lbs + your wing + you is roughly your minimum take off weight.
There are trikes that have a few libs less. I did consider some of them, but took into consideration how much they have to absorb on a not so gentle landing.
The main challenge you are facing is the continues power draw from a single large SP140 battery. According to a post from Paul it is rated for up to 10 kW continues power draw (@Pdwhite Please do make this fact more visible by adding it to the manual - especially for the small battery with it’s 5kW rating). 10 kW does match the fact that the DALY BMS used in the battery is a 100A BMS.
Drawing more than 10 kW is OK for a short period of time, e.g. during take off.
The obvious problem here is that we don’t know how long “short” actually is. Some vendors even define max continues power draw as 180 seconds, which is ridiculous.
Your only way to be on the safe side is flying with two or more large batteries or another battery setup.
Please do not take the risk of overloading the components by flying at >15 kW all the time. Stuff might fail on you while smoking.
If you add another battery your flight time will also be more than the sum of two single batteries due to the fact that batteries can deliver more energy in total on a lower draw rate.
Just as an example take a look at “discharge engery” of the Samsung INR21700-40T 4000mAh measurements publicly visible at lygte-info.dk. Higher average draw results in less energy deliverable before hitting the low voltage threshold + less voltage sack due to less load per cell.
I am not sure what cells the SP140 is using. The effect is way worse for some other cells.
My flight time with the SP140 and the large battery and a 31sm Dudek Boson 31 is up to 26 minutes when being very gentle on the throttle.
Then the BMS cuts the connection, most probably due to the fact that one cell group hits the low voltage protection threshold.
This is clearly less than it should be.
As I can keep the altitude at around 5-6 kW (SP140 throttle values) with trimmers closed, I should have better flight times if my battery would be OK. I am currently waiting for a replacement battery, which should be in snail mail delivery at the moment.