Originally posted by ClusterWiz
If the rocket is about 100lbs. You want something with at least 2250N of thrust to keep the 5:1 thrust to weight ratio. So i would thing you would need a minimum of a M1939 , about 28in. long and 98mm. to be save and more impressive about it, you should go with a N2000, 98mm and 41in. long. a N2000 from most places is about $800. you must have a level 3 cert. and I am unsure if you need a LEUP at this time. If you do not have have a level 3 cert. of a LEUP have a freind that does buy and assemble the motor for you and have him make sure that you rocket is able to take the power of an N2000. Are you planning on gowing to LDRS? you wil get lots of advice from people there. good luck with the progect and keep us posted. we need more new pics.