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  #21  
Old 02-14-2018, 02:20 AM
Rex R Rex R is offline
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Join Date: Feb 2011
Posts: 468
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I gather that things didn't go quite the way you had planned when you stuck the bulkheads in place . a heat lamp and a putty knife may be your best bet to clean up the flood. I've been known to glue a bit of paper over holes to seal them up.
a note about skewers(which one can find at the grocery store), during the summer one can also find marshmellon skewers for toasting them over bonfires, the ones I found are 36" long.
Rex
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  #22  
Old 02-22-2018, 02:45 PM
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WRE WRE is offline
fly'em 'til they don't come back
 
Join Date: Jun 2011
Location: Milwaukee, WI
Posts: 36
Default WI-ROC / WrE / 2018 / Fin Glas

After a short break I am back on the WI-ROC build.
It's time to apply some fiberglass reinforcement to the fins.
The 3 plywood fins included in the WI-ROC have pre-beveled edges. This is an awesome feature that assures aerodynamic regularity of the shape on all of the fins. The application of FIBERGLASS CLOTH and the ZEE-POXY FINISHING RESIN adds structural strength. The fiberglass is not a requirement but I added it to the build process to be consistent with the body tube finish described above. I cut the light weight fiberglass cloth to the basic shape of the fins. After a light coating of the resin on the plywood, I laid the cloth down and smoothed it out using a sponge brush. Then applied a light coat of resin over the cloth. Fiberglassing fins is a process that I don't normally do. So it is actually in keeping with the"experimental" aspect of this build. It's another part of the learning process. I'm glad that I remembered to use vinyl gloves because this is a messy job. I set the fin /tube section aside to cure. I will address the fillets and sanding of the fins next.
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  #23  
Old Yesterday, 07:34 PM
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WRE WRE is offline
fly'em 'til they don't come back
 
Join Date: Jun 2011
Location: Milwaukee, WI
Posts: 36
Default WI-ROC / WrE / 2018 / Fillets

Adding FILLETS to the FIN and BODY TUBE joint strengthens and adds a finished quality to any rocket. First, of course, SANDING the fins and body tube is necessary to prepare the surfaces and promote adhesion. I like to use EPOXY with MICRO-BALLOON FILLER for fillets. The MICRO-BALLOONS raise the viscosity of the epoxy and give it a spreadable quality. The combination of the FIBERGLASS applied to the fin and the EPOXY FILLETS should allow these fins to survive all but the hardest impact upon landing. A thin bead of epoxy is placed where the fin and air frame meet . It is then spread and smoothed with an appropriately curved tool. This can be the back of a disposable plastic spoon. In this case, a Popsicle stick was used because of the WI-ROC's relatively small fins. Ideally, the FILLETS should be symmetrical in shape and size and practically unnoticeable.
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