wrote:

I want to run my engine (ford v-6) this summer for various tests and I
want some sort of prop. What do most people use for props when testing
at this stage? I was thinking of glueing together 2 or 3 fir 2x6's or
using a laminate beam (leftovers from a remodeling project) and carving
some airfoil shape. Seems like it should work if it is balanced. Of
course I don't want to sling a blade down the taxiway or through my
neighbors hangar door. Anybody offer some suggestions? Thanks.

from Michel colomban (cricri, MC100, MCR01 designer)

A square wood beam,
aera= a*a
diam=15*a

You find the power with this formula:
P=0.0532 * (diam/450)^5 * (rpm/1000)^3
with diam in mm
rpm in revolution / mn
or
diam=((P/0.0532) * 10^9 * 450^5 / rpm^3 ))^0.2
a=diam/15

I you want check 180hp @ 3800rpm
diam = 1026mm a = 68.4mm


by
--
Pub: http://www.slowfood.fr/france
Philippe Vessaire ҿӬ