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Uncertain about float position

Old 12-13-2018, 10:00 PM
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Default Uncertain about float position

I have converted my SIG Four Star 60 to electric power using an E-Flight Power 60 and a 5000MAH 6S. I bought floats designed for 46-60 size planes.

Right now the CG is 3 5/8" back from the leading edge at the fuselage which is the manufacturer's recommendation (this is without wheels or floats).

The instructions for the floats say to mount the floats so the CG is 1/2" forward of the float step.

My question is do I leave the CG where it is on the plane and mount the floats with the CG 1/2" forward of the step or do I mount the floats and then adjust the CG 1/2" forward?

I suspect it is the latter, mount then balance but I would like to know for certain.
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Old 12-14-2018, 02:59 PM
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Leave the C/G alone and mount the floats so the step is 1/2" behind the C/G. Adjust the C/G only if you have to, after test flights.
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Old 12-14-2018, 03:45 PM
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Exactly ... the one thing never to alter from its prime position is the CoG, unless you are fine tuning to your flight style.

Floats only create a re-balance if they move the original CoG and you will then need to add / subtract weight to correct.

Floats ... you can love 'em or hate 'em ..........

I have various water planes and I love them - with the river at back of the house. But I have one that no matter what you do in rigging those floats - she just will not play ball at all.... Hobby King Cessna with floats. As soon as she starts to move - spray hits the prop .. I've tried all the remedies ... added spray rails to the floats, altered the angle of sit ... moved fwd ... back ... still she will not play !!

Fingers crossed yours does not do this !!

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Old 12-14-2018, 06:27 PM
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Short answer; The CG of an airplane determines how it flys.

The location of the step determines how well it lifts off the water. Too far back and it won't rotate, too far forward and it will have a harder time getting up on plane to get to flying speed.

Make a google search for Cunningham floats
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