My approach to Level 1
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Kevin OClassen - 27 Apr 2005 12:43 GMT Just thought I'd post something directly about rocketry, and a couple other folks have described their approach to NAR Level 1. Here's my plan...
I've acquired my Skyripper H hybrid motor and most of the pieces of GSE... I've learned a lot about some very obscure (and hard to find) gas fittings. All the rocket pieces and materials are on order, and I finally bit the bullet and ordered a flight computer-- I settled on the G-Wiz LC 400. I like the accelerometer-based apogee detection, and the power output (supports two batteries).
The rocket will be an overstable 4" x 72" (+/-) scratch built, G10 fins (hopefully... I've gotten some tips from my cousin the machinist on cutting and handling the stuff, and think I can pull it off. If not, plywood). Dual deployment, ejection at apogee (drogueless -- 25' 9/16" tubular recovery harness), a 54" x-form chute at 400'. Weight right around 5.5 lbs. If final ground testing supports what I've found so far, I'll be introducing a variation on main chute deployment, mostly applicable to hybrids. Of course, none of it matters until the bird is flown and back in hand, undamaged, but damn am I having fun planning. Complexity means failure points, and I've always loved dancing with Murphy.
Barring the unforseen, at our Section's June launch I plan for a 1000' L1 certification flight on an H155 load, top speed of about 170mph. I took the suggestion "low and slow" quite seriously.
Kevin OClassen NAR 13578
Niall Oswald - 27 Apr 2005 13:51 GMT > Just thought I'd post something directly about rocketry, and a couple > other [quoted text clipped - 30 lines] > the > suggestion "low and slow" quite seriously. What size MMT are you putting in that? Sounds like it could be good for the smaller HyperTek motors too (300/440CC).
I'm taking a similar approach, similar motor, but smaller airframe and only single deployment. I'm looking at about 2000ft on a WCH H100.
I now have a head full of pipe fittings too!
I guess my approach can be summarised as 'KISS, SCHMISS'!
If I hadn't happened to win a 2.6" rocket that would take the motor, I would probably have built something a bit smaller and sleeker. Then again, with a relatively low flight using apogee-only deployment I can use my G-Wiz MC's low altitude channel in 'apogee delay' mode and fire a backup charge. I am considering a separate backup timer too, not really sure I want 3 charges though, so I may go for having the separate timer and G-Wiz channel firing the same charge via separate e-matches, if that makes sense.
Good luck, its nice to read of someone doing an interesting L1 :)
 Signature Niall Oswald ================================ http://www.bits.bris.ac.uk/niall UKRA 1345 EARS 1151 MARS
Kevin OClassen - 27 Apr 2005 14:54 GMT > What size MMT are you putting in that? Sounds like it could be good for > the > smaller HyperTek motors too (300/440CC). 38mm x 28"
I designed the rocket around the Skyripper H & I 38mm cases, since that was the motor I ended up with. After my certification, it should fly to about 3000' on the SR I motor.
We fly from tree-surrounded small fields, and I really want to get my cert flight back... hence the low altitude and the low main deployment.
I plan to start from scratch for L2.
> I guess my approach can be summarised as 'KISS, SCHMISS'! I want that on a T-shirt.
Kevin OClassen NAR 13578
Niall Oswald - 27 Apr 2005 16:36 GMT > I designed the rocket around the Skyripper H & I 38mm cases, since that > was > the motor I ended up with. After my certification, it should fly to about > 3000' on the SR I motor. I take it the J won't fit then :( The SRS motors look nice - simple and elegant, as well as shiny as anything :) My L1 rocket was never intended for hybrids, but I made the MMT long enough for a 6-grain Pro38 with L2 in mind, and that just happened to be long enough for an H hybrid.
> We fly from tree-surrounded small fields, and I really want to get my cert > flight back... hence the low altitude and the low main deployment. Ah, I guess I've been spoilt by my weekend visit to a site with massive altitude potential!
>> I guess my approach can be summarised as 'KISS, SCHMISS'! > > I want that on a T-shirt. Might have to do that in time for UKRA'04, when I plan to launch my L1. I really hope it works! You will post up the results, wont you...
 Signature Niall Oswald ================================ http://www.bits.bris.ac.uk/niall UKRA 1345 EARS 1151 MARS
Niall Oswald - 27 Apr 2005 13:52 GMT > Of course, > none of it matters until the bird is flown and back in hand, undamaged, > but > damn am I having fun planning. Complexity means failure points, and I've > always loved dancing with Murphy. Mean to say, same goes for me...
 Signature Niall Oswald ================================ http://www.bits.bris.ac.uk/niall UKRA 1345 EARS 1151 MARS
AlMax - 27 Apr 2005 19:36 GMT > Just thought I'd post something directly about rocketry, and a couple > other > folks have described their approach to NAR Level 1. Here's my plan... > > I've acquired my Skyripper H hybrid motor and most of the pieces of GSE...
> The rocket will be an overstable 4" x 72" (+/-) scratch built, G10 fins That is a very nice rocket and motor to fly for your L1 Kevin !
I've flown the Skyripper H and I in a LOC Easy I-65 and it was a nice filght.
J.A. Michel - 27 Apr 2005 21:35 GMT Kevin,
Why do you want to dual deploy from a 1000' flight? Going only to 1000', you might want to consider single deploy.
I can appreciate wanting the complexity of electronics on a cert flight, because I did my first electronics for my L2 cert. I personally would be more comfortable flying the "I" motor to 3000' and doing dual deploy. You also might want to consider boosting your second deployment altitude up a bit, maybe to 800' for your first flight. This gives a bit of extra time to "work things out" if a chute gets tangled or something. Go for the lower deployment altitude when you're sure that your 'chute packing skills are up to speed.
Those are some of my thoughts and experiences with dual deploy. However you decide to do it, good luck on your cert flight!
 Signature Joe Michel NAR 82797 L2 http://home.alltel.net/jm44316
> Just thought I'd post something directly about rocketry, and a couple > other [quoted text clipped - 33 lines] > Kevin OClassen > NAR 13578 Kevin OClassen - 28 Apr 2005 10:02 GMT > Kevin, > [quoted text clipped - 12 lines] > up > to speed. Joe,
You've no idea how I've dithered about this issue. Your post recrystallized the points I've considered, and reminded me of something important. Cheaping your way out of a situation leads to problems. That's what's happened here. Cheapie me was trying to save $60 by buying the G-Wiz LC instead of the MC. Unfortunately the LC comes in *either* 400 or 800 foot main deployment only. The LC will not let you choose deployment height.
Your post pushed the final button, durn it. I called Aerocon and changed my order to a G-Wiz MC. So, LOL, the plan for my cert flight is now something like "drogueless deployment at apogee, main ejection 3 seconds later". Might end up being 800' for main deployment. Because of the way my recovery system is set up, I have to use dual deployment, but the MC gives me the flex to take the most reliable route.
Sempre Gumby!!
Kevin OClassen NAR 13578
Niall Oswald - 28 Apr 2005 16:49 GMT > You've no idea how I've dithered about this issue. Your post > recrystallized [quoted text clipped - 7 lines] > only. > The LC will not let you choose deployment height. The MC has a bunch of useful features - not only the datalogging but you can use the main channel as a post apogee timer, which I am planning to do on my L1. Its also got the handy safety jack - you did order the 'remove before flight' tag, right :)
> Your post pushed the final button, durn it. I called Aerocon and changed > my [quoted text clipped - 5 lines] > is set up, I have to use dual deployment, but the MC gives me the flex to > take the most reliable route. It sounds like it will be a fun cert flight - doing it in style! If I make that t-shirt, it will have 'The more failure modes the merrier' on the back I think :)
 Signature Niall Oswald ================================ http://www.bits.bris.ac.uk/niall UKRA 1345 EARS 1151 MARS
Jerry Irvine - 28 Apr 2005 18:21 GMT > It sounds like it will be a fun cert flight - doing it in style! Point.
 Signature Jerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8
Niall Oswald - 28 Apr 2005 22:41 GMT >> It sounds like it will be a fun cert flight - doing it in style! > > Point. I know that saucers are approved for L1 cert flights, but I would personally be far more impressed with someone who pulled off a flight like the one Kevin is planning (or dare I say the one I am planning) than flying a saucer. That said someone might have been flying dual-deployment minimum diameter rockets on G80's (or even better G hybrids) and just wanted a simple cert flight to move onto H's.
Of course the KISS approach is not without its merits, if you want to certify with minimumstress. I think half the fun is doing something risky/complex though!
 Signature Niall Oswald ================================ http://www.bits.bris.ac.uk/niall UKRA 1345 EARS 1151 MARS
Phil Stein - 28 Apr 2005 22:57 GMT >>> It sounds like it will be a fun cert flight - doing it in style! >> [quoted text clipped - 10 lines] >certify with minimumstress. I think half the fun is doing something >risky/complex though! I agree. You guys are discussing stuff that shows some expertise. Anyone can throw a saucer up.
Niall Oswald - 28 Apr 2005 23:27 GMT >>>> It sounds like it will be a fun cert flight - doing it in style! >>> [quoted text clipped - 14 lines] > I agree. You guys are discussing stuff that shows some expertise. > Anyone can throw a saucer up. I will add that until I actually make a successful flight of my rocket, I can talk all I like but I'm not L1 certed, 'Flier X' who used a saucer to cert is and can fly H and I motors all they like!
Like I say though, getting over all that could go wrong (or at least cause me hassles) will, for me make it more satisfying when I do certify successfully. If it takes a couple of tries for whatever reason, never mind (I really hope it doesn't, I'm trying hard to think of non-destructive failure modes here!).
I'm sure this argument has been had out on here before, but I can see where people who think saucers shouldn't be allowed for cert flights are coming from. There are arguments either way, but if the flier is unknown to the RSO, flying a saucer, IMHO, does not demonstrate the same level of competence as flying a 'traditional' rocket (i.e. one with fins and a parachute/streamer). As I see it, its a bit like the difference between taking your driving test in a manual or automatic car - if you can drive a manual you can drive any car, with an auto-only license you've not demonstrated competence at what is a fundamental part of driving a manaul car.
Its not to say that the flier is (neccessarily) any less competent, but if the RSO only has the cert flight to go on (lets say the flier has travelled from a different part of the country, or is even making their first rocket flight, or they've only flown saucers...all hypotheticals I know), how are they to know if the flier can successfully pack a 'chute or determine the stability of his/her rocket.
Flame away, just my thoughts. Saucers are cool, and they do satisfy the requirement for a recovery as intended, but I'm not sure that flying a saucer is a good test of competence for an HPR flier. Perhaps a saucer with a 'chute, I don't know.
FWIW I have no issue with saucers (and their ilk) in general, I've seen some very cool flights made with them.
*dons nomex underwear, hopes for intelligent and reasoned responses!*
 Signature Niall Oswald ================================ http://www.bits.bris.ac.uk/niall UKRA 1345 EARS 1151 MARS
Phil Stein - 29 Apr 2005 01:20 GMT >>>>> It sounds like it will be a fun cert flight - doing it in style! >>>> [quoted text clipped - 52 lines] > >*dons nomex underwear, hopes for intelligent and reasoned responses!* I totally agree. I know there are some (like Art Applewhite) that totally disagree but that's just a combination of conflict of interest & not knowing any better.
Jerry Irvine - 28 Apr 2005 23:28 GMT > >>> It sounds like it will be a fun cert flight - doing it in style! > >> [quoted text clipped - 13 lines] > I agree. You guys are discussing stuff that shows some expertise. > Anyone can throw a saucer up. Stop judging either.
The variety of methods to achieve a stated goal is the spice of life.
Now if only the goal was reduced in stature to a merit badge, 90%+ more of the population would qualify for access.
 Signature Jerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8
Niall Oswald - 28 Apr 2005 23:39 GMT >> I agree. You guys are discussing stuff that shows some expertise. >> Anyone can throw a saucer up. > > Stop judging either. > > The variety of methods to achieve a stated goal is the spice of life. Can't disagree with you there.
I guess what Phil is questioning is whether 'throwing a saucer up' actually reaches the goal. On the other hand, if NAR/TRA/UKRA say it does, then it does.
> Now if only the goal was reduced in stature to a merit badge, 90%+ more > of the population would qualify for access. How does this apply to L1 certification?
 Signature Niall Oswald ================================ http://www.bits.bris.ac.uk/niall UKRA 1345 EARS 1151 MARS
Phil Stein - 29 Apr 2005 01:38 GMT >>> I agree. You guys are discussing stuff that shows some expertise. >>> Anyone can throw a saucer up. [quoted text clipped - 13 lines] > >How does this apply to L1 certification? Jerry-
I don't see what the big deal is with needing a cert or not. If you don't have a cert and want one, you are going to build a rocket weather you have a cert or not. Either way, you fly that rocket. The only difference is how close a look at it someone takes before the flight. Knowing it is a first flight, the typical RSO will look it over fairly well anyway. Also, you have a few people sign off. If you fail, you get to do it again - the same as if you had passed. What is the big deal?
Jerry Irvine - 29 Apr 2005 04:01 GMT > >>> I agree. You guys are discussing stuff that shows some expertise. > >>> Anyone can throw a saucer up. [quoted text clipped - 17 lines] > > I don't see what the big deal is with needing a cert or not. Mandated by NFPA-1127 is the ONLY reason.
That added rule was not self-regulation, it was self-destruction codified.
> If you > don't have a cert and want one, you are going to build a rocket [quoted text clipped - 4 lines] > you fail, you get to do it again - the same as if you had passed. > What is the big deal?
 Signature Jerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8
Jerry Irvine - 29 Apr 2005 03:58 GMT > >> I agree. You guys are discussing stuff that shows some expertise. > >> Anyone can throw a saucer up. [quoted text clipped - 8 lines] > reaches the goal. On the other hand, if NAR/TRA/UKRA say it does, then it > does. I think he is attacking anybody that does not agree with HIM:
Stein: I totally agree. I know there are some (like Art Applewhite) that totally disagree but that's just a combination of conflict of interest & not knowing any better.
> > Now if only the goal was reduced in stature to a merit badge, 90%+ more > > of the population would qualify for access. > > How does this apply to L1 certification?
 Signature Jerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8
Phil Stein - 29 Apr 2005 01:26 GMT >> >>> It sounds like it will be a fun cert flight - doing it in style! >> >> [quoted text clipped - 20 lines] >Now if only the goal was reduced in stature to a merit badge, 90%+ more >of the population would qualify for access. Saucers are cool but as Niall said, building one doesn't show that you can do several major things right. I believe that showing that you can do these thngs sucessfully were the reason that the cert process was established. If a person can't show me that I'm not going to cert him. Of course he can go find someone else that will.
Jerry Irvine - 29 Apr 2005 03:56 GMT > >> >>> It sounds like it will be a fun cert flight - doing it in style! > >> >> [quoted text clipped - 24 lines] > Saucers are cool but as Niall said, building one doesn't show that you > can do several major things right.
> I believe that showing that you > can do these thngs sucessfully were the reason that the cert process > was established. The cert process was established to simply show you can successfully launch an H. I was there. I know.
> If a person can't show me that I'm not going to cert > him. Of course he can go find someone else that will.
 Signature Jerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8
Jerry Irvine - 29 Apr 2005 03:56 GMT > >> >>> It sounds like it will be a fun cert flight - doing it in style! > >> >> [quoted text clipped - 27 lines] > was established. If a person can't show me that I'm not going to cert > him. Of course he can go find someone else that will. You think this is about you? Ha!
 Signature Jerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8
David Weinshenker - 29 Apr 2005 05:26 GMT > >> It sounds like it will be a fun cert flight - doing it in style! > > [quoted text clipped - 10 lines] > certify with minimumstress. I think half the fun is doing something > risky/complex though! With me, it was more that I had a rocket that I had flown on G's and felt that it really needed just a bit more impulse, so I pulled out the cert blank that I'd been carrying around in my range box, lined up a witness, and said "hey everyone watch this - I'm gonna fly an H now..."
Level 2 was interesting... it was kind of a last-minute thing getting written test arrangements made, and due to the uncertainty, I was working on getting things set up for either a NAR or TRA cert, hoping one or the other would be consummated: in the end, both came through, and (having passed each writen exam) I made a flight that was observed by two NAR witnesses and the prefect of the local TRA field, counting simultaneously for certification by both organizations.
-dave w
Kevin OClassen - 29 Apr 2005 09:21 GMT wow. I didn't mean to start an argument, nor did I mean to imply anything about the methods people use for certifying L1. To each their own. For me it's all about the "quality of experience".
I could launch any number of kit rockets, with a variety of APCP motors, and certify. For me, not exciting enough. I've built lots of kits, I've launched tons of rockets with engine-based time delays. A bigger engine? Ok. More epoxy. Still essentially same-o, same-o. My goal with this project is to build and launch a L1 rocket, incorporating as many of the requirements for a L3 bird as is appropriate. Partly because of the complexity, partly because of the quality of technique demanded (i.e. external disarm of pyro charges). Partly because I believe that if something is worth doing, it's worth overdoing.
My L1 launch will be a "peak experience", and I want it to be one to remember (hopefully in a good way, eh?) The complexity and personal involvement will leave me progressively more "keyed -up" until the moment of launch. If I fail, that's cool. I promise you I will have learned a great deal that will be incorporated in the next attempt.
I'll admit to a hidden agenda of challenging the local NAR section to grow a bit.... I am the only member shooting hybrids, for example. Only one other member scratch-builds most of their birds. Kits are fine, APCP is fine. Just not enough psychological "oomph" for me.
Of course, I'm warped.
Kevin OClassen NAR 13578
Jerry Irvine - 29 Apr 2005 14:05 GMT > wow. I didn't mean to start an argument, nor did I mean to imply anything > about the methods people use for certifying L1. To each their own. My point is Phil (and like minded folks) disagrees and wants to impose his view on those certifying, not theirs, and not the rules.
He applies this ethic in a variety of ways and a variety of places in rocketry.
And supports and endorses others that do as well.
All to the detriment of others ocketry experience.
Jerry
 Signature Jerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8
Phil Stein - 30 Apr 2005 00:05 GMT >> wow. I didn't mean to start an argument, nor did I mean to imply anything >> about the methods people use for certifying L1. To each their own. [quoted text clipped - 10 lines] > >Jerry Look at the bright side - I have certified quite a few people and have never refused anyone (yet)
John Bonnett - 30 Apr 2005 19:34 GMT -----snip-----
> The MC has a bunch of useful features - not only the datalogging but you can > use the main channel as a post apogee timer, which I am planning to do on my > L1. Its also got the handy safety jack - you did order the 'remove before > flight' tag, right :) It took some scrounging around the Lab 'O Computers and PAD's before I figured out how to use a 'remove before flight' streamer with my RRC2. What I came up with was a standard motherboard jumper to connect two wires together at J3 for positive power control along with an identical non-electrical plastic jumper. The plastic jumper has the 'remove' flag attached via a lanyard and when installed I know the RRC2 is off. At the pad I will put on the conductive jumper, listen to the beeps, tape it to the wires and tuck it into one of the vent holes. Simple and secure.
-----snip-----
> It sounds like it will be a fun cert flight - doing it in style! If I make > that t-shirt, it will have 'The more failure modes the merrier' on the back > I think :) And "Real BAR's do Fault Tree Analysis" on the front :-)
John<==priming the BT this afternoon
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