Seaplane Preparation / Part 3 of 5

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Other considerations needed beyond welding mounts and rudder retract tubes included attachment of the interconnect pulleys that connect the air rudder to the two water rudders. I purchased a set of EDO float installation drawings from Kenmore Air along with the specified pulley hardware. There’s a pulley on each side of the lower rear longerons and another balance pulley mounted between them on a crossover tube that completes the cable circuit. The brackets remained attached during the fabric skin assembly but the pulleys were removed and stored until needed for the later float installation.

Seaplane doors are basically gull wing doors that open up and away from the prop wash.  Additionally, it allows the pilot and/or passenger to quickly depart the cockpit to grab a rope or a dock.  A conventional side hinged door would be deflected by the prop wash making it difficult to open and quickly depart the cabin.

During the building process I had talked with other builders and seaplane pilots about the necessity of using a ventral fin for the float installation.  The fixed ventral fin fits on the rear underside of the fuse and adds to the overall rudder surface area giving the airplane more directional stability.  The problem is that not every pilot agrees and not every seaplane needs it.  I decided to cover my bases just in case and found  a ventral fin for sale in Canada.

In the early building stage it was difficult to think ahead of the day how I would actually raise the aircraft, remove the wheel gear and install the floats.  Luckily, the wing kit I built  had a very simple solution on how this would be done. It basically consists of a pair of “U” shaped metal fittings that fit over the wing spar bracket using the same through bolt. The top of the “U” has a welded shoulder nut that permits a large 3/8″ threaded eyebolt to attach to.  You only attach the eyebolts when their needed for lifting thus no need to fly around with them. Also this is the perfect place to lift the airplane since it is common with the center of gravity location of the complete airframe.

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