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if you are prediction that close to the waiver you should fly when the windows are open to avoid any problems.Good choice on going with the smaller motor. What is the biggest motor that you have flown? what is your…   Read more»

Thanks for the feedback. I think I’ll go with a small J to cert and then step up to the big stuff. I was concerned about the waiver because as Warren mentioned Rocksim doesn’t always sim perfect, esp when you’re…   Read more»

In any event, don’t believe much of what you see from Rocksim aside from CP and CG calcs… Good luck to all seeking records.Warren

And you need to keep in mind that both are dynamic.

I’m a big fan of MD rockets… specifically have a 54mm bird designed around the L330 and currently down to 54″ although I have a new Von Karmen nose for it and haven’t measured it with that nose yet. Sims…   Read more»

Actually, it comes down to the RSO’s (GOD on the range) decision. And everything advice wise offered has been excellant counsel. Costly mistakes happen with a GO attitude and inexperience or lack thereof.

Indeed, James – you are right again! I had said K550… a J415 has a lot of snort and if someone did an L2 on a full J that is minimum diameter, that is cool. There are some great 54mm…   Read more»

Like James said, Cert with “J” Motor first. Then do the “L”.You will have plenty of time to destroy your Rocket, after your Cert.

K’s are great too. there are a few K’s out there that are fun!

Have you thought of trying a K550 or something similar first?JJohn, it is his L2, I would think the largest motor he has used is an I unless working with someone on a group project. Or he was certified some…   Read more»

I’m a little concerned because others flying the same rocket on the same motor said they hit 31K? Thoughts?Rockets are like Fish…. thier stories are bigger than they are. Like James said, Cert with “J” Motor first. Then do the…   Read more»

James offers good counsel on all the above. Yep, if you break the waiver, you fail the cert. Ditto if you land outside the cylinder of the waiver.Regarding an L730 on a minimum diameter. That is theoretically doable, but it…   Read more»

You are right, if you break the waiver you fail even if the rocket lands 5 ft from the prefect or person doing the cert and is in perfect shape and everything worked as designed.31K on a 54mm L? I…   Read more»

Pretty sure Cliff has done so with very mixed results. In this case, I probably wouldn’t do that if I were you.

Yes there are people who have reused single use nozzles some with good results and some with bad. With aerotech nozzles they do erode but if you know the rate and that is what you are looking for then great….   Read more»

Not typically – and not on a non-research day. The Aerotech phenolic nozzles erode during the burn. It would be interesting to see just how much they open up for the different reloads and burn time – but that’s a…   Read more»

Only the graphite ones that Loki & AMW use. I wouldn’t ever reuse one that’s meant for single use. Even if it looked OK, would you want to bet your rocket that it was?

As odd and off-the-wall as this may sound, I think I may have two of those nozzles from the 80’s. PM me with your e-mail address, and I’ll take a picture of what they look like. Up to you. You…   Read more»

you need to be careful that the nozzle does not change the function of the motor, if it is a bell or shroud around the motor you will need to use something like the aluminum bells that I think RT…   Read more»

Its not for the motor but its part of the rocket. The Geo Sat LV has 2 boosters attached to the side and has plastic nozzles to simulate an actual rocket. I would like to put motors into the boosters…   Read more»

Are you looking at making a nozzle for an Estes motor? not sure I understand what you want but if you are wanting to make a nozzle, you can use graphite rod but I am not sure what diameter of…   Read more»

Thanks for the info, you guys are great. Have any of you had the RF interference problems that Mike Konshak spoke of in his Sport Rocketry article. It seems to me that this may be a reason to go with…   Read more»