lcorinth
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I've been working on the Quest Big Dog for some time now. It's taken me a while, mostly because I wanted to make some decisions - what adhesives I wanted to use, what to do with the fins, whether to use buttons or launch lug, what size buttons, etc.
But it's coming along, and I've never posted a build thread here on TRF (I think), and I have plenty of pictures, so I thought I'd start one.
Rocket: Big Dog
Manufacturer: Quest Aerospace
Length: 32.5 inches
Diameter: 1.97 inches (not 1.92 inches, as is stated on the kit. This will come back later)
Motor diameter: 29mm with 24mm diameter adapter.
Decals: Self-stick
Part I: Parts
Yep, all there. I won't be using the thrust ring, and in the picture is included an Estes 29mm screw on retainer.
Part II: Motor Mount
The shock cord is in two parts: Kevlar thread, tied to an elastic band. The Kevlar end is tied into a slip knot around the motor tube and passes through the forward centering ring. I got the centering rings as straight as I could, and embedded the shock cord mount into a fillet of glue. Once the aft fillets were dry, I did forward fillets.
You can see I marked a line where the motor retainer would end, just to make sure I had room. Kit instructions had the aft ring about an inch in, so there was no problem there. I scuffed up the inside of the motor retainer, as well as the end of the motor tube, and attached the retainer to the end of the tube with JB Weld.
I don't know what kind of knot I used to tie the Kevlar to the elastic. It seemed pretty strong, but if it ever came undone, I'd have no way of re-attaching it. I massaged a bit of JB Weld into the knot with gloved fingers.
But it's coming along, and I've never posted a build thread here on TRF (I think), and I have plenty of pictures, so I thought I'd start one.
Rocket: Big Dog
Manufacturer: Quest Aerospace
Length: 32.5 inches
Diameter: 1.97 inches (not 1.92 inches, as is stated on the kit. This will come back later)
Motor diameter: 29mm with 24mm diameter adapter.
Decals: Self-stick
Part I: Parts
Yep, all there. I won't be using the thrust ring, and in the picture is included an Estes 29mm screw on retainer.
Part II: Motor Mount
The shock cord is in two parts: Kevlar thread, tied to an elastic band. The Kevlar end is tied into a slip knot around the motor tube and passes through the forward centering ring. I got the centering rings as straight as I could, and embedded the shock cord mount into a fillet of glue. Once the aft fillets were dry, I did forward fillets.
You can see I marked a line where the motor retainer would end, just to make sure I had room. Kit instructions had the aft ring about an inch in, so there was no problem there. I scuffed up the inside of the motor retainer, as well as the end of the motor tube, and attached the retainer to the end of the tube with JB Weld.
I don't know what kind of knot I used to tie the Kevlar to the elastic. It seemed pretty strong, but if it ever came undone, I'd have no way of re-attaching it. I massaged a bit of JB Weld into the knot with gloved fingers.