Semroc Saturn 1B engine choice

[sjh1]

I have recently completed a Semroc Saturn 1B kit and opted for the single D sized engine configuration because I have never had good luck with the cluster option. I have been told that now that the D-12 engine is now under powered for this model. I do have Aerotec 24/40 reloadable. I am wondering if a E-11 or E-18 is a better choice. Opinions please.

 

[mikec]

I've flown mine several times on the D12-3 and it's not so bad, but definitely low and slow. The AT E20-4 works well, so I expect an E18 would work too.

 

[jazzviper1]

I like the 4 C version, flights are spectacular. Lots of smoke and the 4 flames look like the scale center motors.
Next one will be 8.

 

[Mr G]

Started with an Aerotech E15 composite (337ft), then an E20 (maybe 350ft), then an F20 (est. 400ft) and finally a 29mm G25 (est. 500ft). All worked well but the 4.5 second slow burn with the G25 was the winner.