Hello,Kostas!
I built my floats from plans.They are not quite finished yet.Are you using a "Soft Start Module" on your engine to retard the timing?I have the same engine but have not started it yet.The "Soft StartModule" is supposed to reduce "Kickback" on start up.
Heinz Genrich

Hello again,Kostas!
Do you recommend the "Vortex Generators" for the 701?
Heinz Genrich

Hi, congratulations on doing an 801 amphibian, I have both the 701 and 801 as amphibs on czech floats. The 801 is in the Bahamas except during hurricane season, the 701 in St. Petersburg, FL.

The 801 amphib needs every bit of extra hp you can add, spec the engine to the max. I started with a fuel injected superior (lycoming clone) xp360 with 7:1 compression with automotive gas acceptable but found that water takeoff, climb rate and ceiling were unacceptable. I added a turbocharger with manual waste gate that brings peak hp up and now takeoff from salt water is around 15 seconds.

Takeoff is 34 knots with full flaps, cruise is around 65 kts, max is around 75 kts. I descend at 55 kts and touchdown at about 40 with close to full flaps. Fuel consumption is 11-12 gph.

The floats you propose look like an excellent choice. Mine are czech 1900's but after a year of use I have added epoxy and foam flotation on the bottoms to bring them up to 2200 or more. Much better feeling floating higher in the water. Current weight is probably similar to clamar.

For pictures of my 801 go to: http://picasaweb.google.com/jeff.fortune/N63VKAZenithCH801Amphibiou...

If you want to see the 701, which is set up just like yours, you can navigate to these by clicking on "jeff's albums to the left of the 801 title.

That's a start, please send specific questions.
Jeff