I have been checking over my stocks of TSP motors that were produced before all TSP motors were modified so they could pass the stringent requirements of certification. They are, therefore, pre 2022, but, given the shelf life of motors is at least four years, they are still just fine for our purposes. I know, because I've just been testing them!
The stocks I have are:
TSP L-2, nominal thrust 200 mN
TSP L-2, nominal thrust 170 mN
TSP L-2HP , nominal thrust 320-350 mN
all these come in labelled boxes or packs of ten motors.
TSP L-3, nominal thrust 550 mN. These come in boxes of seven motors.
I tested examples of all these L-2 motors without modification, and these specifications are about right, though of course, the thrusts do vary during a run.
L-2 170 mN'; 170 mN 24 sec.
'L-2 200 mN': 180-210 mN, 15 sec.
'L-2 HP 320 mN' 330 mN 13 sec.
this was encouraging, but I had two thoughts:
1. 330 mN is rather more power than we would want to put in models originally desighned for Rapier L-2. Drilling out the nozzle to from 1.5 mm to 1.8 mm gave a very acceptable 180 mN (or so) for 16 seconds.
2. there is no equivelent to the old Rapier L-2L, which gave a very nice 100 mN (or so) for 20 plus seconds.
Drilling out a '170 mN lTSP L-2' nozzle to 1.6 mm gave a rather nice 120 mN for 20 sec; drilling out the nozzle to 1.7 mm gave around 100 mN for 23 sec. Perfect!
I did try drilling out a couple of '170 mN motors' to 1.8 mm. This was a step too far, perhaps. The thrust was well below 100 mN for most of its 26 sec. Still, it might be worth trying with a very light model.
I am happy to ship packs of motors to anyone in the UK at a cost of 20 GBP, incl 'postage'per pack of ten.
Please note thes motors come without the posh packaging and green fuses you get with the CE TSP motors which, let me emphasise, are value for money and more convenient to use (I love them!). Pre CE motors come without fuses and need electric ignition (I only part with fuses at meetings!).
So, if you want to get stocked up before the Flying season, here's your chance. Contact me by email or post a request on this thread.
I'm tempted to add, "Hurry, hurry whilst stocks last!"