Bruiser
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Toward the end of my "Which Missile to Kick Off 2021 With?" thread it seemed like the Peregrine was going to be the winner. I had started to build it before the poll closed and have continued to work on it here and there while also building the Lockheed Cuda Missile. I thought it is probably time to play catch up a little bit. Warning though, it's very similar to the Cuda build...
I started with the engine mount. I made my centering rings from 1/8th ply and glued them on the tube with epoxy. You can also see where I have built up the aft side of the end centering ring so the boat tail will have a lip to glue to.
Next step is to build up part of the tube so the forward centering ring can be pushed into the aft body tube to the correct depth. I do this with several wraps of tape. Then the centering ring is slide over the front of the motor tube. I apply epoxy to the inside of the body tube then slide the motor tube assy into the body tube to the correct depth and I stand the tube up on the end. The centering ring will push the epoxy (like a bulldozer pushes dirt) and the epoxy will form a nice fillet with the tube standing on end.
After the epoxy dries I pull the motor tube out and I apply a fillet of glue around the backside of the forward centering ring with a scrap piece of dowel. The next step is a little complicated because now you have to apply epoxy to three areas. So here we go...
First apply epoxy to the front end of the motor tube. Next apply epoxy to the inside of the body tube about one inch inside. Now you slide the motor tube assy part way in as pictured. When you get it in this far you apply more epoxy to the very aft of the body tube, all the way around. Just move the motor tube assy to make room. Then you finish inserting the motor tube assy until the aft centering ring (the plywood portion) is flush with the end of the body tube. Make sure to turn the tube if you need to so the slots in the centering rings align with the slots in the body tube.
Next is to install the boat tail and it is made from two wraps of poster board. I used payloadbay.com for the templates. I installed one wrap and while it was still drying I put a coat of Elmer's glue on the second wrap, laid it over the first wrap and held it in place with tape. It was quite tricky and there has to be a better way. After it dried I applied CWF and sanded over and over until I was happy with the contours.
Next I made a shelf in the forward end of the coupler. It's just a few pieces of 1/8th ply glued together and epoxied inside the coupler. I coated the entire inside of the coupler with thinned epoxy. I also installed a eye bolt in the center of the shelf to attach the Kevlar to. I put a few drops of JB Weld on the threads (not pictures) to help keep it together
Since this coupler goes into the body tube a few inches I was afraid to use wood glue because of the way it can grab and lock. I used a little epoxy that I carefully smeared around with a gloved finger and bam, the aft assy is done
-Bob
I started with the engine mount. I made my centering rings from 1/8th ply and glued them on the tube with epoxy. You can also see where I have built up the aft side of the end centering ring so the boat tail will have a lip to glue to.
Next step is to build up part of the tube so the forward centering ring can be pushed into the aft body tube to the correct depth. I do this with several wraps of tape. Then the centering ring is slide over the front of the motor tube. I apply epoxy to the inside of the body tube then slide the motor tube assy into the body tube to the correct depth and I stand the tube up on the end. The centering ring will push the epoxy (like a bulldozer pushes dirt) and the epoxy will form a nice fillet with the tube standing on end.
After the epoxy dries I pull the motor tube out and I apply a fillet of glue around the backside of the forward centering ring with a scrap piece of dowel. The next step is a little complicated because now you have to apply epoxy to three areas. So here we go...
First apply epoxy to the front end of the motor tube. Next apply epoxy to the inside of the body tube about one inch inside. Now you slide the motor tube assy part way in as pictured. When you get it in this far you apply more epoxy to the very aft of the body tube, all the way around. Just move the motor tube assy to make room. Then you finish inserting the motor tube assy until the aft centering ring (the plywood portion) is flush with the end of the body tube. Make sure to turn the tube if you need to so the slots in the centering rings align with the slots in the body tube.
Next is to install the boat tail and it is made from two wraps of poster board. I used payloadbay.com for the templates. I installed one wrap and while it was still drying I put a coat of Elmer's glue on the second wrap, laid it over the first wrap and held it in place with tape. It was quite tricky and there has to be a better way. After it dried I applied CWF and sanded over and over until I was happy with the contours.
Next I made a shelf in the forward end of the coupler. It's just a few pieces of 1/8th ply glued together and epoxied inside the coupler. I coated the entire inside of the coupler with thinned epoxy. I also installed a eye bolt in the center of the shelf to attach the Kevlar to. I put a few drops of JB Weld on the threads (not pictures) to help keep it together
Since this coupler goes into the body tube a few inches I was afraid to use wood glue because of the way it can grab and lock. I used a little epoxy that I carefully smeared around with a gloved finger and bam, the aft assy is done
-Bob
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