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Hydro & Marine Redbird Construction - Part 4
Photos and text by Miha Holc
Water outlet À from short 4 mm aluminium piece glued with 5 min epoxy.

Strut holder ready to be installed.
As I said, M2 screws, sinkhead style. Notice quite large amount the yellow gum stuff around the screws for sealing . This is a gum glue from UHU À see my Kiwi Pico buildup for details.
Large diameter washers ensure the load to be distributed more evenly.

Some steps of drilling holes is skipped. Strut holder is already installed and the end of al tube is peaking out of the bottom. We installed it 3 mm above the bottom, little bit less as by plans. Here the white, quick drying elastic silicone sealant is applied to seal the contact with the strut, yet still have it adjustable. Note the provisory 2 mm steel shaft, later used for motor holder glueing.
Some futher steps missed - short on time for taking pics . Motor holder was installed using 2 mm shaft to get nice aligment. Under the shaft guide al tube there is also scrap of carbon fiber of wedge shape. All the glueing was done with 5 min epoxy and microbaloons.
Rudder holder is a little bit tricky À it is some kind of 3 D carbon fiber structure. Two carbon fiber plates are on each side and there is CA'd carbon fiber piece on the top. Thin aluminium piece that connect rudder holder and strut really strenghtes the rudder holder. Wonder about the weight of the hardware + installed motor holder and drive tube + servo holder? Less than 20 grams. On the instructions and other German boats you can see that they use bent brass tubes, some in very trick 3 D shape. To get this done is about same amount of work to bend and solder the tubes properly but you have the rudder angle fixed. Here I can adjust the rudder angle so the boat will go nice thorough the corners without flying out, submerging or jumping.

Another view from the other side. The L shaped trunfin holder needs to be bent to get the fin parallel to the centerline. We installed it perpendicular to the wing bottom.

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