Technical question about float's

[Stian]

Hi everyone,

I gave a float rating this summer, and I realize, I have some missing thing in my initial. I don’t know to much about float’s.
I realise also a lot of people don’t know eider a bout it.

-The number 1500 and 2000 are two numbers who give the volume of the float, the eider one can be use on the same plane but the 2000 sink less the 1500 but are more heavy.
My explication it is right? Or close?
Do we have other number we can put on the plane?
Which type of float do you we have on the Otter or Beaver, what number it is?

-On each float we have a plate with the maximum weight, ant the weight of the float.
This last one did include the weight of the connection between the float and the plane or is it just the float?

-If one day I want buy floats for my plane, how I know the one who I m interested is the good one for my plane? With size of float I need for un PA-18(example) How that work?

Thank you for you help, and sorry for my poor English.

[Heliian]

http://www.wipaire.com

[rigpiggy]

I believe in Canada the Regs say that the combined flotation must be 1.8*MTOW of the A/C, ie 3430's on a 206 MTOW is 6860/1.8=3811 which with wing tip tanks/extensions is 3800 correct me if I'm wrong

[Stian]

Interesting!

This summer I flew a PA-18 with a MTOW of 1750 lbs so we are more close of 3000 then 2000. And my plane had 2000 on it.

Thank you also Heliian for the web site, I definitly keep this site on my favorit, but I don't find the answers a my questions.

[robertsailor1]

Edo 2000's are the standard sized floats for a Super Cub. I also used them on a modified PA-12 and they were more than adequate.

[rigpiggy]

Interesting!

This summer I flew a PA-18 with a MTOW of 1750 lbs so we are more close of 3000 then 2000. And my plane had 2000 on it.

Thank you also Heliian for the web site, I definitly keep this site on my favorit, but I don't find the answers a my questions.

so 4000/1.8=2222# allowed, however the 200's are more prolific, and unsure of the weight versus say 1650's, or 1800's if they had 1650's 3300/1.8=1833#'s, conversely the PK 1800's should allow a 2000# gross/ the different designs may also act differently on the water during loading downwind turns, t.o, and landing.

[Stian]

Sorry Rigpiggy I’m have some hard time to understand everything, may be a language problem. I don’t understand where come from the 4000. What is it this number? In your first post you said we multiply the MTOW by 1.8 but on the same line you divide the MTOW by 1.8.


What are exactly mean 2000. This is the volume of the float? Or just a number we give to a type of float?
What is exactly the difference between a float #2000 and #1500?

I find on the net, the length of the float should be at 80% of the length of the plane.
That changes something when you want buy a new floats for your plane or the # (ex2000) is enough as a reference?

I hop. I’m not to break balls (French expression) with my questions?!

[HS-748 2A]

"2000" is the pounds of water which would be displaced if you forced the whole float under water.

'48

[StudentPilot]

Largely based off of rigpiggy and HS-748's posts since it's been awhile since I have read anything about floats:

EDO 2000s = 2000 lbs displacement per float
Two floats on a Super Cub = 2000 * 2 = 4000 lbs total displacement

The greatest MTOW allowable on EDO 2000s is 4000 lbs (total displacement of two EDO 2000s) / 1.8 = 2222 lbs.

The required displacement for floats on a Super Cub is 1750 lbs (MTOW) * 1.8 = 3150 lbs, so any floats with 1575 lbs of displacement or greater is sufficient to float a Super Cub (ie 1650s and 1800s as rigpiggy mentioned previously) - provided you have two of them!

[Stian]

Thank you all for your answer.

I understand now.