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Making the plane waterproof for landing in the water
Finding the right glue
I tried 3 different glues. The model we use (mini talon) is made with “EPU” expandend PU.
I tried:
* UHU POR - special glue for Styropor and similar foams. * UHU Plus - 5 min two component epoxy * Hot Glue (Patex)
The results:
UHU Plus
UHU Por
works well. good fixture and waterproof:
But - the glue has to be applied in the right way! It has to be thin and completely dry before putting the parts together:
Bust is to spread it equally with a (gloved) finger:
Hot Glue
Closing holes
The so glued model had some holes to fill / close. I used thin plexi-glas. Best way to glue them was hot glue, as it can also fill little holes or irregularities in thickness.
I used the same technique also on other parts.
Sealing connections and small holes
Using a good tape can close all kind of connections and other small or thin holes. I used “3m Blenderm” - a waterproof and flexible tape:
One other option is hot glue - as in this example:
Waterproofing the servos
there are 2 interesting articles on Instructables on this topic:
https://www.instructables.com/id/Water-proofing-a-Servo/ https://www.instructables.com/id/Waterproof-your-servo-motors/ (if you want to follow this one, dont forget the glitter on your finger nails)
1. Make the housing waterproof
* I used “Curil”, a standard sealing compound. * Open the servo and put the sealant an all touching surfaces * also put sealant to the cable, where it leads through the housing
2. Insert a O-Ring under the horn
* remove the horn * add a 1mm thick o-ring * add some lubrication. I used “CRC Multilube” - attention - lubrication has to be compatible with the rubber of the sealant. Don't use silicon rings with silicon lubricant. * screw the horn back on
Test it...
- submerge in water while it moves - no bubbles should emerge