Making screen-guard…
Foil cast is referenced for space allowable for guard that will protect condenser’s exposed fins.
Aluminum rod. Copper electrical lugs for footers. Will rivet footers to condenser’s frame work.
Aluminum mesh is “guard.”
Mesh edges and footers will position underneath trim-strip. Mesh is notched at footers so trim strip will fit tightly over both these parts.
Believing simple solution for “ON at prior speed” is possible to achieve for automated turbine motor operation, am moving forward with turbine unit’s install.
Not having to operate turbine at full-screamin-throttle solves noise puzzle in part. Still, total silence---as heard from cabin with windows closed---is goal. Isolating turbine housing from rest of system seems one requirement.
Turbine’s housing O.D. is 70mm---measurably smaller than 4” duct. I questioned whether to narrow the duct at the turbine… or… to center turbine unit within solid 4” aluminum tube. Tube direction is chosen based on materials on hand.
Rubber fenders will center and isolate turbine housing inside 4” tube.
Using EasyMold. 2 stainless 4-40 screws with washers get embeded into each fender. These two screws will secure fender to turbine housing. Once all fenders are mounted to turbine’s house… house unit gets inserted into solid aluminum tube. Will secure fenders to aluminum tube with wood screws… plus compression-grip of fenders.
“Mold platform” set-up with screw-pairs in place. Depth of screws in platform is slightly shy of turbine housing’s thickness.
EasyMold (EM) cures to hard rubber. Access to embedded screws is provided by channels cast into EM---small pipes placed into cast. EM cures quickly (possibly adjustable by altering quantity of hardener---I’ve always mixed 50-50 so not sure about this.) There’s just enough time to fill and work single mold in this case before time’s up. Trick = ensure entire mold cavity is filled and media is “internally connected” before times up. Once EM reaches a certain point, it no longer bonds to itself meaning if layers are added into mold and not blended together before time’s up, casting is fractured.
Casting’s came out good except for each mold being over-filled. Was going to “squeegee” excess off top of molds but spent time ensuring cavity being filled and good internal blending existed.
Excess rubber is sanded away from every fender. Rough grit takes EM down easily. Each fender’s height is now set to grip-compress 1/16” when installed.