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Old Nov 30, 2001, 10:28 PM
Registered User
Vassar MI USA
Joined Nov 2000
330 Posts
float plane?

is the c.g. changed from flying from land to water use?

what angle does the airplane need to sit in the water to take off and lang properly?

is it needed that you add tail weight in the floats?
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Old Nov 30, 2001, 11:02 PM
YVR
Sean in YVR (Vancouver)
YVR's Avatar
Vancouver, BC
Joined Sep 2001
276 Posts
Glad to see I'm not the only one thinking about float planes in late November!
Here's a good site to check out for a whole bunch of info:
http://members.attcanada.ca/~ironsidz/floats.htm

I'm going to convert my old trainer (Aerolectric) to floats, probably going to get them from http://www.foamcorefloats.com/

Has anyone else had any experience with the foamcorefloats.com product?
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Old Dec 01, 2001, 12:38 AM
H2OFLY
Portland Oregon USA
Joined Feb 2000
2,509 Posts
You must not have a job! :)

i-fly -

First questiion: Balance point better NOT change!

Second question: Sighting along the bottom of the wing, the top of the floats should be about 5 degrees difference, for an almost-flat bottom or flat bottom wing. LE of wing should be higher relative to the top front part of the floats (assuming floats with a flat top, or nearly flat top).

I have found that making the part on the float that the gear attaches to be adjustable up and down, lets me fine tune the mounting for each model...they are all slightly different in how they take off from water. For example, if you screw metal straps over the gear (where the wheel usually is) to a piece of aircraft ply that is imbedded in the float; and if the model really jumps off the water fast - add 1/4 inch ply on the back float mounts and test that setup; if it still jumps off, add another 1/4 inch piece.

If the model doesn't want to take off without really yanking it off the water my using full, or nearly full elevator - you don't have enough distance between the front of the float and the LE of the wing - add ply there until it takes off as you desire.

That help?

Terry
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Old Dec 01, 2001, 12:56 AM
Registered User
Vassar MI USA
Joined Nov 2000
330 Posts
im in school no job yet...

ok so if the plane jumps off the water move the float back untill it takes off how you want???

o ya what angle is the bottem of the float to be?
this is a 1/4 piper super cub 104 wing span clark-y airfoil about 68inch long
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Old Dec 01, 2001, 05:49 AM
Registered User
Coimbra, Portugal
Joined Feb 2000
875 Posts
Great link YVR!

Thanks,

Joćo
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Old Dec 02, 2001, 12:17 AM
H2OFLY
Portland Oregon USA
Joined Feb 2000
2,509 Posts
Don't move the floats.

Shim under the rear float mounts (each side) if the model wants to take off too quickly - that will put the LE of the wing closer to the top of the floats.

Don't consider the bottom of the floats, unless you are going to design your own.

Sure wish I could do pictures! (No, I won't)

Terry
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Old Dec 02, 2001, 04:21 PM
Registered User
Vassar MI USA
Joined Nov 2000
330 Posts
im designing my own floats

what angle should the bottem of the floats be??

any ideas on how to cut the correct angle in the bottem of the floats?
since the they will be foam how should i cut them??
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Old Dec 02, 2001, 07:24 PM
H2OFLY
Portland Oregon USA
Joined Feb 2000
2,509 Posts
Sorry -

I don't know angles from doorknobs - go to that website another flyer hypelinked to a reply to you, and look at the pix and ball-park it. Keep the bottoms flat, do a straight line from the step forward to about 2 inches from the front, curve it up to the top.

The angle on the back part (bottom) seems to be about the same angle as that on the front, maybe a little steeper.

The step on floats this large is usually 3/4 to 1 inch (STEP= the difference in height from a baseline drawn under the lowest point on the float bottom, and the lowest point of the rear of the float bottom)

You can see I'm not an engineer - hope this helps.

Terry
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