- This topic has 19 replies, 7 voices, and was last updated 17 years, 9 months ago by
Conway Stevens.
Conway Stevens.-
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Conway Stevens
Actually similar to what Ed was explaining But a little different.
Epoxy a Centering ring in place just down a little from top of the booster. Then using a piece of all thread cut to length for the specific motor size/length you would screw it into the motor forward closure and I even recommend using a double nut or lock nut to hold it tight to the closure so it wont back out. Slide the all thread and motor into place into the booster section. You would now have a couple inches or so of all thread sticking out above the centering ring with the motor tight at the bottom on its thrust ring.(you will need to cut the all thread to length) Then you would have a Bulk plate with a hole in the center for whatever size all thread that would be sticking up. I would also recommend putting larger diameter flat washers on this and then nut them into place with the bulkplate on top of the Centering ring. Now the bulkplate is tight and the motor is held in place via forward retention. All you need now is a forged eye nut and a locknut to hold it in place. You now can tie your harness directly to the top at the eyenut. If you want to run a different size motor just change the all thread length. Hope that made sense.. If not give me a shout and I would be glad to show you.
Doing it this way makes it easy to do without having to stick your hands down inside the tube as well as it will fit several different motors including as long as will fit in the booster.
Conway Stevens
Bruce, and others, Here is a description of what I am doing..
I have 2 min diameter projects I am working on. First is the 98mm project. It will use a form of friction fit. The actual motor case will protrude up out of the booster section and will act like a coupler for the upper airframe to booster(this part is also slightly modular in design to accommodate a few different case sizes from 24″ to 48″ long motors). My apogee deployment will be drougless and held in the lower section of the upper airframe. Upper airframe will be no more then 24″ long and this also includes where the ebay will rest. Which will be Housing 2 altimeters the batteries and a GPS downlink and tracking module. From there the upper airframe portion thats still part of the 24″ and then to the nose cone. A Von Karmen nose. It will house the chute and the main harness as well as the standard tracking device. Launch will be via Tower. No rail buttons. It will be shear pinned on both ends. The case will have a special closure built that holds an assembly for the shear pins to push into. But thats it in a nut shell. Both the same ways for 75mm and 98mm. As JW always says “Come on in the waters is fine” Well time for the sharks to hit the water.
So far I should be a max length of 8ft. Or I should be under. With a weight of less then 10lbs (no motor) probably close to 8lbs-9lbs max. All glass construction with a 2 layer 1/2 & T2T laminate on the fin section with Carbon Fiber. should be interesting. On the pad with the 17500 motor should be around 28 to 30 lbs max weight. That will be riding close to 85% full N power. Should be a boost.
Anonymous
Conway, Like this but bigger?
Tony
Bruce R. Schaefer
The knowledge this club has is incredible! Conway, I know what you’re saying, and thanks, that’ll do it. Tony2, that rocket looks perfect!
Anonymous
That rocket of Tony’s is incredible. I’ve seen it. Weighs less than 5# empty. And yes, folks – that is an M casing in that rocket. Post flight (in other words, it WORKED!).
Note that there are no upper restraining bulkheads, rings, etc. There is also no aft retainer. That is friction fit motor retention.
Tony, will see you in August on the playa. My rocket will look vaguely familiar to you 😉
JW
Conway Stevens
Conway, Like this but bigger?
TonyYou know it bro !!! Not nearly as good or as nice yours is. 😳 That takes time and practice As you said something to me about things borrowed. 😉 I always take that as a big compliment and you should as well.
I figure to start off a little longer and then trim it down as I can to get the best out of it possible. So I may get down there in length. Just not sure yet how much. Largest case will be the 98mm-17500 case. I making my tubes and stuff from glass not CF though. Still should work fairly well. No record setter like yours is. I am yet still the student and just glad that youve been kind enough to share with me. I have some more stuff to hit you up on and will give you a shout a little later.
I plan to fly mine here a little but go big at both LDRS and BALLS this year..
Happy New year Tony!!
Folks let me tell you they dont get any better at doing High Altitude stuff then Tony here does. ANYONE that wants to learn or has goals and dreams to fly’em high can do good to look and listen to what Tony does. Im even sure Mr JW will confeer!
Conway
Anonymous
My annual goal is to stay within 10K of Tony’s best shot. This last year he recovered from 36K. I was unable to even get to 24K.
Tony has been very helpful — no two ways about it.
I plan to step it up a bit in 2008….
Warren B. Musselman
Don’t feel bad guys, I have a 4″ MD project I just started that is designed around the M795 CTI motor that simms over 33K and another one designed around the N1100 that simms to nearly 46K. The crux will be if I can build them as light as the sim’d design is. If so, look out baby…
Warren
Anonymous
Conway no offense taken..Borrowed is good. I get a kick out of seeing guys using borrowed stuff from me..like Wimpy Red or my ejection charges. At night when I can’t sleep I lay there thinking about how can I squeeze a few more feet out of them. Best starting advise..given to me was from Woody. Don’t fly it if you can’t ‘afford’ to lose it! Which has a few meanings to me. If you can’t afford the $ loss..don’t fly it. If you can’t afford the emotionally…don’t fly it. If you can’t afford the ribbing of your peers…don’t fly it. I flew a 5″ min dia rocket this year at Balls..and It became misplaced. My son and I went back out to Black Rock a couple of weeks later looking for it. We spent 3 days of hard looking for it..(if your looking for some light reading on some cold Colorado night check out the story http://www.rocketryforum.com/showthread.php?t=40353&highlight=Balls )
The reasons I looked so hard for that rocket was because I had a few new and interesting tricks and I wanted to know if they had worked or not. I biggest thing was that I wanted to know how high it really went..Because when ‘chicks’ ask me how high I’ve gone I don’t want to say… it ‘simm’ed to’. Did losing that rocket slow me down? Yes, some what..I need to figure out some better tracking besides my Walston. It smarted $ wise and I’m getting things replaced slowly..Thanks Santa. I am planning a 3″ N that I hope to get 50K out of for Balls this year. What was the question any way?
TonyConway Stevens
Tony,
I have had the opportunity to read your P motor flight that was missplaced.(several times Ive gone back to it.) All I can say is Wow! I was tottally bummed as if it were mine after reading it. Some day it will turn up.
I hear you on the stuff Woody said and every bit of it true. In fact I bet ive heard him say it to me as well at one point in time. Even though losing any project is a bummer its not life ending. If you want to play you must pay is how ive always heard it and planned to play by. Losing stuff or breaking stuff or even good ribbings from your peers is all part of the game. Its the risk that we beat from time to time that makes it all worth it. I plan to do some lower poweed flights on these projects to get some good prelims done. Then turn up the heat later at BALLS this year.
3″ N? Curious more swamp gas? and how long does one have to make a motor in that to be a N motor? Ive been working on a slow forumula/geometry for later use just have to do some static firing and dial it in.
The question was still what kind or how much sweet talking does a guy have to do? 😉 Feel free to hit me on email later bro..
Conway
Conway Stevens
Anonymous
Bruce R. Schaefer
Warren B. Musselman- You must be logged in to reply to this topic.