I've always wondered this - what does Kn mean?Gary,
Sounds like a great long-burn motor! I can't wait to see this motor used as a sustainer in a 2-stager.
The liner must be getting pretty thick now, eh? Must be at least 3/32" for an 8 second burn.
Also, will AT be notching the face of the endburner to give a slightly higher initial Kn? The G69's can be a bit tricky when dealing with igniters....
Kn is the ratio of the propellant burning surface area to the nozzle throat area.I don't want to get the thread sidetracked, but then what is the significance of Kn? Like...what characteristics does Kn attribute to the motor's performance?
Thanks for the reply. I see that these new endburners will need the "38mm Endburn-Style Forward Closure Plugged". Can you comment on what the differences are with this endburn style plugged closure and the normal 38mm plugged closure?
By the way, I finally found a copy of the "mini-cineroc" plans you did years back.
The instructions are complete and have been submitted to the certifying agency. Certification should be granted shortly.OK, I found a thread about the instructions needing to be written up. Anybody know the release date or have a link to the thrust curve?
You're welcome Mike, and thanks for flying it.Gary and Karl were at Mudrock this weekend and had an I49 for demo. I'm a sucker for long burn but everything I had with me was too heavy for a motor that only puts out 10 lbs of thrust. So Justin Lawyer and I teamed up to design and build a rocket Saturday afternoon so that we could fly the I49 Sunday AM.
I'll put a build thread on HPR about what we actually built (Impending Doom), it was kinda crazy. But, I thought I'd post here just to say thank-you to the Aerotech guys for letting us have the motor. It is truly awesome to watch a motor burn for 7 full seconds - it was still burning when that little rocket was completely out of sight.
Oooh Oooh! :eyepop:I sense a perfect motor for my L2 PR Competitor3! More info please! And what ever happened to the 54/2800 case upcoming? Haven't heard much about it.You're welcome Mike, and thanks for flying it.
FYI the I49N & I59WN reloads are being delivered to dealers now.
Oh, and if you like the 38mm long burns you're going to love this:
I'm a little confused on this. Ares the endburn-style forward closures required to fly the reload, or just optional if you don't want to deal with the delay stuff?Daniel,
The endburn-style 38mm forward closure eliminates the need for all the delay components as it is "fully plugged". It also includes a recovery system anchor (5/16-18 UNC thread) as well as a threaded boss for the Electronic Forward Closure.
Are the mini-cineroc plans in electronic format? My originals were destroyed in the 2001 AeroTech fire.
It was certified with the new closure. Technically it is possible to plug an existing closure with the longest delay and pack all the remaining void space with grease, and the motor would function properly.I'm a little confused on this. Ares the endburn-style forward closures required to fly the reload, or just optional if you don't want to deal with the delay stuff?