Build log 2014-12-07 : Improved hull, RC equipment

Hull went through an aggressive diet. Walls and bottom were thinned. All in all approximately 30% shaved off.

Minor issues (clearance for the motor, ...) were fixed. Printing hull Rev.30 took a little under ten hours (overnight, as usual).

Print included an integral servo mount (ie: printed right with/within the hull) but it was too skinny and broke off too easily. I then decided to print another strong servo mount and "acetone-welded" it in place.

Hull and deck (Rev.31)

Hull and deck (Rev.31)

3D model of what was printed

Superstructure design

Superstructure design

More design required; getting closer

Side view

Side view

Redesigned/strong motor mount

3D printed hull with RC equipment

3D printed hull with RC equipment

Tests in bathtub were promising

Underside

Underside

3D printed push knees and rudder arm

Deck and push knees

Deck and push knees

Mock installation

RC components are installed (with hook & loop / Velcro). Servo mount is a good fit.

RX, motor and ESC all work great. Even on a single LiPo cell motor seems a little fast but ESC allows smooth starts and has linear throttle response. Low pitch of the prop also helps a lot.

Motor was soldered to ESC to save weight and limit clutter. Servo plug on ESC was replaced with a 1.25mm Molex Picoblade one, to fit on the RX.

Rudder will be redesigned to get a little more surface (towards the propeller) although steering is already very decent.

Weight so far (including all propulsion, RC components, battery, push kees, deck, beam ...) is 149g (5.25oz). Previous hull (barebone) was 126g !

Next: printing a few bollards to install on deck (before deck is bonded to the hull).

And more work on the wheelhouse design.