Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by Speedboat100, Aug 9, 2019.
Yes and on the shallow shores on the lakes there are a lot of rocks etc.
One thread, of several, here HERE WE GO AGAIN !
Do you mean the katamaran type with tunnel hull ?
Sorry. It was a tongue-in-cheek reference to a former (now banned) member here whose solution to everything was a tunnel hull.
Vulnerability to floating debris is one reason that hydrofoils are not much used. Either on floatplanes or fast watercraft. There are some other reasons too. The hydrodynamic lift from a hydrofoil changes when going to fully submerged to be planning on the surface. Then there are practical issues like beaching and docking. Less the vulnerability to floating debris, it is possible to work around this. The Lisa is an example of a plane with working hydrofoils. As for beaching, it has retractable gear, extending further than the hydrofoils.
`Greed again. Seven inches is not that much freeboard. Also appreciated input from Doggzilla, Aesquire, and BJC.
This has some boxy features and looks like simple to make too. What is it actually ?
So her's my Rotax 503 powered U/L. Can change from wheels to floats in about 15 mins,almost the same both modes but a whole lot more fun over water.
Whoaa..is this your own design ?
Well have been flying on wheels for about 10 years then the floats came up for sale and I decided to adapt them. Just re calculated the so the cog remained exactly the same and it flew perfectly as with wheels.
What type of ultra is it ?
It just a basic rag and tube meets 95.10 Recreational Aviation Australia MTOW 300 KG.
Iam only 65 kg so that helps. Floats are hollow fibreglass weigh about 32 kg all up.
They have a Vee bottom not flat which provides better handling and directional stability.
Yes you need more rudder area to compensate boxy floats..that weigh about 6 kilos each when ready. It is easy to design the rudder system now..when one knows what kinda floats one is having. Also the water operations in general demand more rudder.
I drilled some lightening holes in it and got it down to 34 grams..that would indicate around 7 kg per float. I have to make'em ( floats ) smaller apparently to reach 5 kg per float.
Yes I counted I can make them to 18 cm wide..narrowing them 7 cm each..getting them down to 5 kg a piece.
Here is what I came up with...I think I am going to build a katamaran for my daughter to test them....before using them in a real aeroplane. Those fit a small car too when the back seat is tilted down ( I hope ).
Here is a quide to get basics right: https://booksite.elsevier.com/9780123973085/content/APP-C3-DESIGN_OF_SEAPLANES.pdf
Or an air-blown hover skirt.
I made the 1/3 scale float for my special hyperlite electric water and ground operated craft.
To meet my criteria it ought to weigh 185 grams. Foam + sides were 140 grams. I am pretty close on the target.
It is being cured after clueing. I had to do some mods on it...the step is a bit more forward...and placing then again slightly more aft of the previous BLUE FOAM.
Here is the raw version of the 1/3 scale float. It is estimating around 60-70% less weight than the regular Part 103 float.
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