6th July 2013, 08:01 AM
My first fiberglass rocket!
A while ago I posted in this thread asking what to use to glue fiberglass together. Since then my girlfriend and I started working on our new fiberglass rocket. This is a first for both of us, and we are going to launch it with an F engine at first but I thought it would be more relelant in the HPR discussion since it's a fiberglass rocket and many of the building materials we used are more relavant to high power rockets, but I'm happy to move it if people would like. Since it is around the 4th of july (we actually started working on it on the 4th), we are going to make it an America themed rocket... specifically Captain America
Anyway, the first thing I did was get the engine retainer on the engine tube... I ordered the size too small from Apogee. Since the rocket kit wasn't branded I wasn't sure wich size retainer to get. Because of that I bought the medium retainer which was a bit too small. I tried to sand the retainer and the engine tube a bit, but I don't have a dremmel of my own which made it rather difficult. I ended up essentially press fitting the engine mount onto the tube, using a vice, without JB weld since the fit was so tight.
We JB welded the bulk head to the engine mount and primed it and the end of the rocket tube with high temperature spray paint.
The only shock chord we had laying around was a bit too small, but we drilled a hole in the upper bulk head to attach it. We are just using the shock chord to connect the nose cone, but not the parachute because I don't think it can handle the weight of the whole rocket.
Here's some more of my girlfriend getting ready to put the fins on. For this we used some Loctite marine epoxy which as a two hour setting time and a 24hr curing time. After securing the fins and waiting about three hours I noticed that one of them was crooked. This was my first time using epoxy and fiberglass... so I was freaking out. I was able to cut some of the epoxy off using a utility knife and then, luckily, I was able to break the rest of it without damaging the fin. It was very lucky.
By the end of the first day of working on this my girlfriend and I had gotten it assembled and three coats of primer (which was all the primer we planned on using).
6th July 2013, 01:23 PM
Last edited by crossfire; 6th July 2013 at 02:15 PM.
6th July 2013, 01:24 PM
IS this rocket a Jart? You can fly this on many different reloads even J reloads.Have fun
6th July 2013, 01:38 PM
Is that shock cord the elastic type? If so, I would like to recommend that you replace it with something better; like nylon or Kevlar. Elastic and fiberglass are a recipe for disaster... at any level beyond the Estes and Quest kits.
"He who fights with monsters should look to it that he himself does not become a monster, and if you look long into an abyss, the abyss also looks into you." - Friedrich Nietzsche
6th July 2013, 06:49 PM
As far as I understood you are going to attach the nose cone to the bulkhead, but you will not connect the chute to the nosecone?
You are aware that normally the nosecone is used to pull out the chute?
So, unless you use a piston, you should reconsidering your shockcord configuration.
And if the cord can not handle the weight of the rocket, it is likely that it can not stop the nose cone.
6th July 2013, 07:23 PM
assuming that this is a Wildman jart, a)there isn't room for a piston b) the chute is not directly attached to the nose (it is attached to the shock cord(which is usually 15'(yes I said 15') of 1/8" Kevlar) c)check your cg in flight configuration (with motor) most Jarts need nose weight(hold off painting the nose until after you get the proper balance ). all that said, Jarts fly nicely with an F40, F50, F52, they tend to try and get lost on G's.
6th July 2013, 08:04 PM
oh, and for those wondering about which retainer you need for a Wildman rocket with a 29mm mnt...you need an Aeropack RA29P.
6th July 2013, 10:48 PM
Two bits of advice. Ditch the elastic, and to keep the fins on straight, print out a fin alignment guide at www.payloadbay.com, trace it on cardboard and make a jig to hold them in place
And yea, That looks a whole lot like a Jart.
7th July 2013, 01:03 AM
7th July 2013, 08:42 AM
Today my girlfriend and I worked some more on the paint. We taped off the body of the rocket and then painted the fins blue. The only things we have left to do are the body's clear coat, the heat resistant paint on the bottom of the rocket, and then finally we will need to attach the chord holding the parachute. We are using a 15" parachute because we wanted something small that will let the rocket descend fast. We usually launch in pretty small fields and this way it won't have too long to get lost or caught in trees.
Here's the parachute apparatus that is 4th of July themed to match the rocket. We flame proofed the american flag and it will double as the parachute protector as well as a nice decoration as the rocket descends. The flag also serves as extra mass up high to make the rocket a little more stable.
And here are the photos of the fins paint job. Again, we still need a clear coat but it is looking good.
7th July 2013, 01:35 PM
You guys did a very nice job building the rocket. The paint job is sharp. What size motor are you going to use for its first flight?
9th July 2013, 06:24 PM
Last edited by kjmccarx; 9th July 2013 at 06:33 PM.
9th July 2013, 10:54 PM
you'll need to shorten the delay by about 6 sec.
10th July 2013, 06:40 AM
Last edited by kjmccarx; 10th July 2013 at 06:43 AM.
10th July 2013, 07:09 PM
Nice Build Hope she flies well
Jr Level 1 Here I Come!
23rd July 2013, 06:08 AM
We did the launch earlier today. Here's the HD photos!
Here we are setting up for the launch. We made sure to have out fire extinguisher ready because of the fresh-cut, dry grass.
WE HAVE LIFTOFF!
here's a 1920x1080 wallpaper... if anyone wants is: http://bit.ly/18wAFRO
The chute is deployed, as well as the USA flag.
In the end we connected the spectra shock chord to the rocket via the rail button nut, and it worked out great. This was a launch of many firsts for my girlfriend and I: First fiberglass rocket, first re-loadable engine, first static shock chord, first x-form parachute, first rail launch, and first time using an engine retainer. Thanks for all of the constructive feedback throughout the process - it wouldn't have been nearly as successful without all of the help I got from TRF. I'll definitely keep posting my future rocket so people can criticize, compliment, and look.
'Til next time
Last edited by kjmccarx; 23rd July 2013 at 06:30 AM.
23rd July 2013, 06:24 AM
Am I seeing that correctly? The full blast of your motor firing directly into dry grass? Please tell me there's an optical illusion in there somewhere! Rocket looks great, BTW.
23rd July 2013, 06:27 AM
Yes! Optical illusion. The rocket is in a clear spot, and on a large launch pad. I though it made for a cool photo like this, though.
Originally Posted by chadrog