I didn't like the plans method of mounting the fuel flow transducer to the intake runners, so came up with this mod after three prototypes:
Angle mounted with foam between sump and angle on two ¼-20 tapped holes on the port side sump. Then, red cube mounted to bracket with foam between bracket and cube.
Gotchas:
Cube has to be mounted with bolts (AN3-20) with washers and nuts. I suppose the bracket could be tapped so a machine screw could be attached from the top, but then safety wire would be needed. Countersunk machine screws from the bottom with nuts on top would be elegant, but the runners prevent the screws from being inserted from below (ask me how I know).
Cube has to be mounted far enough from the sump so the cube does not touch the drilled bolts going into the sump (otherwise, all the effort to isolate the cube is lost because of vibration from bolt heads to cube).
The pads are fabricated from a product called Poron (https://www.stockwell.com/data-sheets/poron-4790-92-extra-soft-slow-reb.pdf). It is the most vibration absorbing stuff I could find. Used for isolating really sensitive electronics from vibes. Highly temperature resistant.
I used this stuff because of the discussion I found here regarding vibration possible affecting the transducer readings. This solution should provide more damping than the Adel clamps on the runners (which presumably works well, and that is why the plans specify this method)
I plan to mount my Vertical Power PPS to firewall with this stuff as well.
Angle mounted with foam between sump and angle on two ¼-20 tapped holes on the port side sump. Then, red cube mounted to bracket with foam between bracket and cube.
Gotchas:
Cube has to be mounted with bolts (AN3-20) with washers and nuts. I suppose the bracket could be tapped so a machine screw could be attached from the top, but then safety wire would be needed. Countersunk machine screws from the bottom with nuts on top would be elegant, but the runners prevent the screws from being inserted from below (ask me how I know).
Cube has to be mounted far enough from the sump so the cube does not touch the drilled bolts going into the sump (otherwise, all the effort to isolate the cube is lost because of vibration from bolt heads to cube).
The pads are fabricated from a product called Poron (https://www.stockwell.com/data-sheets/poron-4790-92-extra-soft-slow-reb.pdf). It is the most vibration absorbing stuff I could find. Used for isolating really sensitive electronics from vibes. Highly temperature resistant.
I used this stuff because of the discussion I found here regarding vibration possible affecting the transducer readings. This solution should provide more damping than the Adel clamps on the runners (which presumably works well, and that is why the plans specify this method)
I plan to mount my Vertical Power PPS to firewall with this stuff as well.
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