I'm getting reading to build my Semroc Sat 1B. I was thinking rather than use the 3 motor cluster or the 1 "D" motor that I would try a 24MM reload. Does anybody know if this has been done before or that it would work at all?

It'll work just fine and dandy. You could also build it with a BT-70 core to house removable mounts. You could go with the quad 18mm mount or the 24mm mount according to your mood or motor supply. With the BT-70, you could even rig it up to fly on three 24mm motors.

First of all the Semroc S1B is not a 3 angine cluster, it is a 4x18mm engine cluster, with optional single 24mm instead.
Yes you can use the 24mm RMS in this kit as the D15-4T is one of the suggested 24mm engines.
This engine is ONLY available as a 24mm RMS reload from Aerotech (it does not exist in single-use form).
This engine is about equivalent to a 4-engine cluster of Estes B6-4's albeit with lower peak thrust.

I am going to use either this engine or the Aerotech 24mm RMS E28T (About equal to 4 estes C6-5's) for my first flight.
I'm leaning toward the D15-4T.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !

I've flown mine with a E15-4 and a F24-4, both great flights.
Here's a pic of the F24 flight.

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Tony Vincent
NAR # 45082 L1
CMASS, MMMSC Member

That's a cool looking shot!

I knew that!! As I have said before I suffer from CRS and I was living in the past with my Sat V which had a 3 cluster. For some reason I was under the impression that the Aerotech type motors had a different mount but now I see that they are the same size as an Estes "D" which is the biggest we had back then.
Thanks for jolting my brain back online.

Would you suggest then the 4 engine cluster or the Aerotech reloads for a more realistic liftoff/flight??
thanks again

Now that sounds like the answer to my problem. Where would one get a BT-70 conversion kit like that??

That is a GREAT shot. Which motor did you use on that flight?

Not sure about the interchangeable mount but I built mine with the 18mm Quad setup theflights are always impressive. It looks really cool going up with four flame trails and lots of smoke.

Here is a picture just after ignition.

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Next to a scale rest room for the astronauts....

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Don
NAR 53455
"Carpe Diem"