Hello,
I have a home-built UFO that uses 4 propellers for vertical lift. the props are 10x4.5 gws style props and are spinning around 4500 rpm wiht 5.33:1 gearboxes. they sit in a short venturi pipe with about 1.75" from the bottom of the pipe. there is about 1/4 inch between the prop tips and the sides of the venturi. (i can not bring it any closer than that because it is made of foam and is very flexible) would i increase or decrease the STATIC thrust by constricting the pipe after the propellers a bit? i know that it could move faster if pointed horizontally, however it is a vertical ship with very little forward motion, so static thrust is what is important. Most people have questions about the UFO that do not regard the question. If you have one, PM it rather than ask it here, i dont want this thread to get off subject.
thanks for any and all help,
-spaceclam