Here are the specs that I needed to develop my own set of floats for the Champ S+ (Champ S Plus). Two large ponds near my home were calling my name.
Challenges:
1. HobbyZone doesn't make them.
2. The 12" floats by E-flite are too short. I bought them and had to return them.
3. There is no rear bracket for struts and the landing gear passes through the battery compartment.
Here is some information pulled from many sites and experts:
1. Floats should be 75% to 80% of the fuselage length, so our length is 18.2" from prop adapter to the back end of the fuse. 75% = 13.65, so let's call it 14".
2. There's a general consensus that floats need to be wider than the landing gear and it should be 25% of the wingspan. Our wingspan is 27.3", so 25% = 6.8", so let's call it 6 3/4".
3. Mark your CG (Center of Gravity). It should be 1.1 to 1.4 inches behind your wing's LE (Leading Edge). Put your battery in and just use your fingertips. The CG is between that carbon fiber bar and the wiring for the servos. Make a dot with marker. While you're there, write your name and phone number under the wing next to the fuselage.
4. Floats aren't skis. They have a "step" in the middle on the bottom side. I like the "V" at the bottom. The step needs to be about 1/2" behind the CG.
5. I'm no foam sculpting master, so I contacted Mark at SeaPlaneSupply.com and ordered (PayPal) a set of 14" foam floats. Tell Mark you want them for
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