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TOPIC: New Motors from TSP Modelar

New Motors from TSP Modelar 2 years 6 months ago #1519

  • rogersimmonds
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You will see from Terry's recent blog that the TSP motors have achieved the long saught-after CE certification, and that Piotr has some nicely packaged examples:




Piotr has provided the following specs:



These look to be a very nice product indeed (note the inclusion of fuses) and Terry and I hope to test some examples and publish the thrust/time graphs soon. :)

Certification is of course only the first step to legitimate retailing of motors, and we do not know how long this process will take.

But (and this is good news) we have adequate supplies of what could be called -1 'precertification' motors. These are now tested, and bagged or boxed up and available from me, so please contact me for prices and availability.

These are reliable motors and should last us at least until supplies of the new certified motors are available.
The L-1 motors are all rated at 88-96mN for 17 sec; the 'L-2' motors are more diverse, with thrusts ranging from 180mN to (gulp!) 420mn. Thrusts can of course be tuned by boring out nozzles to suit the model. We have a few L-3 motors of higher thrust too.

I'm tempted to say, "Hurry, hurry whilst stocks last". :cheer:
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New Motors from TSP Modelar 2 years 4 months ago #1542

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We still have a good supply of what could be called the 'pre-certification' TSP L-1, L-2 and L-3 motors, so please contact me if you need some for the next flying season. These motors should last us at least until supplies of the new certified motors are available, but, (and to repeat myself) "Hurry, hurry whilst stocks last!"

Though Terry and I have not yet tested the new certified motors, and we will report on them as soon as we can, this interesting news appeared in an email from the Vintage model company (VMC):



so it does appear we will soon be able to buy motors 'over the counter' instead, as now, 'under the counter'.

VMC are to be applauded for this venture and I look forward to confirmation from VMC's Tim that they have motors in stock (and how much they are!).

I then had a thought: "VMC already have built-up Jetex/Rapier kits in their catalogue, but, if they really want to promote the new motors, they need a range of easier to build and fly profile models suitable for beginners.. For instance these:



modesty prevents me from saying who is responsible for these. :whistle:
but all are proven designs and can go very well indeed and are a good advertisement for our hobby.

VMC are not averse to considering these profile models as a product line, they tell me, but they are very busy and with other projects. will need convincing. :S

So some 'lobbying' is called for. More than an email from just me! If you would like to see a range of rocket propelled profile models, please contact VMC (there is a contact email address on their website) to encourage them so that they will realise the interest out there and the potential market.

To do that now would be a good idea! I for would like to see a 'Jetex Revival' in my lifetime. :cheer:
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New Motors from TSP Modelar 2 years 4 months ago #1543

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My 'lob' has been duly 'lobbed' I think...
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New Motors from TSP Modelar 2 years 4 months ago #1545

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Hi guys,

the latest from VMC:


As any regular visitor to jetex.org knows, adapting the classic Jetex designs for 'one shot motors' whether Rapiers or TSP is not not too difficult. Adapting my profile models to make them good kits for VMC will not be so easy!

Many thanks to all who contacted VMC about profile models - they seem to have got the message. B) them. We are at very early stages of course, but it's a start! :cheer:
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New Motors from TSP Modelar 2 years 4 months ago #1553

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I've this morning completed my testing of the new CE version motors.

I fired off 3 each of the 5 types that I received samples of from Piotr. And I must say the performance of each of the samples was remarkably consistent. Admittedly these are all from the same batch but this was very pleasing.

These new CE motors do have slightly wider nozzles to accomodate the green igniter fuse that is mandated for CE qualification but they lit easily with the fuse and then perormed steadily.

Here is the average performance for the 5 types tested:
L1 109mN 13.5 sec
L2 196mN 17 sec
L2HP 351mN 16 sec
L3 539mN 18 sec
L4 1178mN 17.5 sec


What is of course lacking is an exact Jetex 50 equivelant, something on the order of 139mN would be equivelant to the Jetex 50's claimed half ounce thrust. Over the next days I will explore the possibility of widening the nozzle of a production L2 to see if it is possible to reduce the average thrust and increase the duration. We have had some success with this technique in the past but we must see if this can be done while maintaining stability of thrust and not having a tube burn through.

I must say I'm looking forward now to some test flying.
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New Motors from TSP Modelar 2 years 4 months ago #1555

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I have now had a chance to put the 'CE' TSP L-1, L-2 and L-2 HP motors on the test rig. Most measurents were done in duplicate just to check the first run. I estimated the usable 'burn time by the sound the motor made, waiting for the moment I would actually launch a model on the flying field. Here are my results:

L-1 133 +- 13 mN 10 sec
L-2 183 +- 17 mN 12 sec
L-2HP 335 +- 33 mN 12 sec


These results are not too dissimilar to Terry's results (but note the 'burn times' which are, I admit, somwhat subjective and shorter than Terry's) . My L-1's appear a bit more powerful than Terry's. Though this is pleasing (this thrust is just perfect for my profile F-100 Super sabre) I wondered what the effect of boring out the nozzle from 2mm to 2.5mm, to (hopefully) make these TSP L-1s sutable for, say, a Jetex Wren. This gave

L- 1 (2.5mm nozzle 1) 120 +- 22 mN 12 sec.

This was 'interesting', so I tried a TSP L-2 with a 2.5mm nozzle:

L-2 (2.5mm nozzle) 133 +- 17.5 mN 14 sec.

Such a performance is perfect for some of the classic Jetex scale designs, and I look forward to Terry's more comprehensive 'boring out' experiments. :)

General observations:
The run times are distinctly shorter than we have got used to with Rapiers and Piotr's 'pre CE' motors. This is an inevitable consequence of a larger nozzle diameter resulting in of a lower Specific Impulse. This we can live with - there will be no more wretched 'burn throughs' - and (a) it will keep our models in smaller flying fields and away from trees etc and (b) us old guys will have less far to walk to retrieve models :lol:

Another consequence of the lager nozzles is a rather fiercer exhaust flame:



Above: a TSP CE motor on song. It was a dull on the day of the tests and the exhaust flame is bright. Hmmm ... We may find ourselves changing our motor trough linings and thrust tabs more often with these motors!:unsure:

Motors did not always ignite using just a fuse: some abraision of the propellant with a 1mm screwdriver helped a lot. Ignition using a modified Cord Zap with four AA batteries worked every time.

As Terry has noted, the consistency of the motors during a run and the repeatability of examples (note the acceptable standard deviations) was good and far better than we have seen with Rapiers.

I'm looking forward to trying these motors on the flying field. I shall be soon writing an article for' Aeromodeller' about all these exciting developments - new motors, reliable distribution, new suitable models from both VMC and Piotr Tendera to suite these motors, progress with igniters. So, if you want me to include your own comments and observations in said article, start posting!B)
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