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  #21  
Old 05-08-2012, 08:46 AM
PaulK PaulK is offline
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Quote:
Originally Posted by GammaMan
now your scaring me. Epoxy scares me.
At the risk of going way OT, epoxy isn't necessary for HPR, just depends on your building materials, and how big / fast you want to go. Folks have done L1 and L2 rockets with cardboard tubes, plywood fins, and wood glue. You'll find a lot of info on the forums, just be sure to wear gloves when using epoxy.
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  #22  
Old 05-08-2012, 08:50 AM
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Quote:
Originally Posted by jeff2space
Chad,
I will be going for my L1 Cert on the 19th at Bong (20th if the 19th doesn't work weather wise). If you're not too busy maybe you could observe mine? Otherwise I know I'll be able to track down a couple other members.
Rocket: Madcow Super DX3
Motor: Pro 38 H120
Jeff
Hi Jeff. There are always plenty of members willing to help with certs, I hope to be there too. Note that the May launch days have a late start.
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  #23  
Old 05-08-2012, 12:04 PM
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DeanHFox DeanHFox is offline
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Default Rms

Actually, I could really use some help with RMS assembly. I've flown plenty of Aerotech SU, and have bought a couple RMS cases and reloads, but would like to practice up with midpower loads before cracking my L1 later this summer...
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  #24  
Old 05-08-2012, 12:30 PM
Rex R Rex R is offline
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RMS are relatively simple to assemble if you follow the instructions that come with the reloads*, that said, I'm reasonably sure that most of us would be willing to assist, you just need to ask. some things you should pack
1/2" masking tape
celophane tape
hobby knife
emery board
o-ring lube.
rex
*they vary a bit depending on which reload you're doing but, the basic assembly remains the same.
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  #25  
Old 05-08-2012, 12:39 PM
MikeCr MikeCr is offline
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Quote:
Originally Posted by chadrog
Actually, it would only take 73 of them to get past 160 Ns. (73 motors x 2.2Ns = 160.6 Ns) I'll help ya' wire it!


That wouldn't be acceptable though for a L1 cert flight. At least one of the motors used has to be an H or I.


Mike
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  #26  
Old 05-08-2012, 01:00 PM
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Quote:
Originally Posted by MikeCr
That wouldn't be acceptable though for a L1 cert flight. At least one of the motors used has to be an H or I.


Mike

True, but he didn't say anything about a certification flight...
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  #27  
Old 05-08-2012, 06:05 PM
MikeCr MikeCr is offline
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Quote:
Originally Posted by chadrog
True, but he didn't say anything about a certification flight...


Maybe I'm wrong, I took it to mean certification because of the previous comments. But the other thing is, to require HPR certification the total installed impulse of all the motors would need to be over 320Ns (160 .01Ns or more per single motor).


Mike
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  #28  
Old 05-08-2012, 07:04 PM
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Beyond 160, you're into H impulse - you're taking this waaaay too seriously.
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  #29  
Old 05-08-2012, 08:09 PM
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Bill Bill is offline
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Quote:
Originally Posted by Rex R
RMS are relatively simple to assemble if you follow the instructions that come with the reloads*, that said, I'm reasonably sure that most of us would be willing to assist, you just need to ask. some things you should pack
1/2" masking tape
celophane tape
hobby knife
emery board
o-ring lube.
rex
*they vary a bit depending on which reload you're doing but, the basic assembly remains the same.



Along with something to wipe any grease or lube off of your hands before handling the delay grain. Baby wipes work very well for that.


Bill
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  #30  
Old 05-08-2012, 08:11 PM
MikeCr MikeCr is offline
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Quote:
Originally Posted by chadrog
Beyond 160, you're into H impulse - you're taking this waaaay too seriously.


That's true, for a single motor. But not for a cluster of motors.
From the NAR site:


Who Needs HPR Certification?

A person needs High Power certification if they:


1 Launch models containing multiple motors with a total installed impulse of 320.01 Newton-seconds or more, or

2 Launches models containing a single motor with a total installed impulse of 160.01 Newton-seconds or more, or

3 Launches rockets that weigh more than 53 ounces (1500 grams), or

4 Launches models powered by rocket motors not classified as model rocket motors per NFPA 1122, e.g.:
a Average thrust in excess of 80.0 Newtons
b Contains in excess of 125 grams of propellant
c Hybrid rocket motors

So clearly you could launch a combination of motors up to 320.00 Ns w/o needing HPR certification. Now, I don't know if there would be anything else you need to consider. I always thought that the total installed propellant weight limit for non-HPR was 125g, 62.5g per motor. The way it's stated above the max limit per motor is 125g. At any rate I don't think I'll be clustering 145 A3's anytime soon!
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