TOPIC: New Motors from TSP Modelar

Thank you Terry. The flight of the Skray was just outstanding, and I put the usable motor time at around 17-18 seconds.

These TSP L-2s are obviously quite powerful - did you try 'bored out' L-2 or one of the '150mN thrust motors with the Skray?

Terry has just measured the thrust of the latest batches of L-2 motors with the following results:



Terry adds:
The green trace is the July batch; red and grey are deliveries of Sept 7th and 8th respectively (a very nice 150 mN ).
Orange is the Sept 16th pickup.

As I've remarked before, we can plan our 'winter bulding program' with confidence we have the wherewithal to power our models!

Hi Roger , whats the current progress on manufacture of L3 variants please -- thanks TB

Hi Tony,

a timely request. Terry has measured the latest batch of TSP L-3 motors from Piotr with the following results:



These look to be a very viable product.

I have to say these L3s are very nice motors. Of the small initial batch that Piotr has produced every firing has been easily accomplished with the thrust quickly steading and no sign of burn through on the 15mm diameter motors.

I just took one out for an air test on a 290mm span Depron [ ] and balsa T33. Weighs in at 40gms and got a very nice flight out of it.

Roger adds:

did you mean your latest T-38?



Very encouraging!

Jetmaster motor as quoted in January 1954 aeromodeller engine analysis supplement advises jet master thrust as 1.875 ozs .
Jetmaster with short augmenter tube rated at 2.5 ozs thrust
jetmaster with long augmenter tube rated at 2.25 ozs thrust .

believe that 1 once force = 0.2780 newtons force so lets say L3 average at 500 mN from the graph then 1.875 ozs thrust = 0.52127 newtons or 521mN
So these L3 are equal to a jet master without augmenter tube -- does this sound about right .. i hope so ????

Not exactly