Seasquare GT (oz5595)

About this Plan

Seasquare GT. Radio control sport seaplane for .29 to .45 power. Wing area 540 sq in.

Quote: "Seasquare GT is part of a series of experiments with RC seaplanes and floats that have flat bottoms. The original Seasquare flat-bottom design was built quite secretly, since we felt that a simple design of this sort might not be an immediate success. The day of test flying came and the fears went away! What we had hoped was true:

1. A flat-bottom hull rises quickly onto the step and planes nicely.
2. The large 'wetted area' of a flat-bottom float causes no problem of drag.
3. A wide hull keeps water out of the propeller even in relatively choppy water.
4. A low profile design makes for excellent water handling.

Since these tests, several similar designs have been tested, and the latest is Seasquare GT. It is based upon Quick-float, which was published in the May, 1973 AAM. If you built a Quickfloat you can easily convert it to a Seasquare GT. If you didn't, look up the Quick-float article, and make the required modifications as you build the floats. Specifically, the following needs to be done:

1. Omit the nose-gear attachment device entirely.
2. Change the foredeck and bulk-heads to make the hatch for the RC equipment.
3. Add the holes in the bulkheads for the Nyrods.
4. Omit the parts of the main gear attachment devices that project above the top of the float. Do not omit the remaining parts. They are needed for strength and to provide a strong location for the wing rubber dowels.
5. Add the wing stop behind the wing and the dowels for the wing rub-ber.
6. The length of the tip floats has to be changed. Note that the tip floats are cemented permanently to the wings of Seasquare GT.
7. Change the water rudder shape to provide better steering.

The construction information in this article will he limited generally to an order of putting things together and some notes on the tricky places. Although Seasquare GT is not a difficult project - there are very few compound curves to worry about - it is not for a novice. While docile on the controls, this seaplane can hold its own with many pattern designs.

The builder should bear in mind that waterproofing must be done as construction progresses. The inside of the structure must be sealed with dope or epoxy (Hobbypoxy Formula II diluted 1:1 with thinner). Before installing the final sheeting, coat the inside of the structure and the inside surface of the sheeting to be used to close the structure..."

Update 01/03/2018: Replaced this plan with a clearer copy, thanks to Circlip. Also added article, thanks to RFJ.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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