Propellers

[[email protected]]

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.

David Woolery

[Richard Lamb]

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.
>
> David Woolery
>


I seem to recall a thread about propeller G loads a while back.

The number is staggering!

Just slap a prop on it for initial test runs.

No idea, if it's geared.

Direct drive? Try something from an 85 - 100 hp airplane?


Best of luck.

Richard

PS: I happen to have a Chevy 4 liter V6 - if anybody interested is watching.

[Philippe Vessaire]

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

[Morgans]

"Philippe Vessaire" > wrote

> 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

Is the area in the formula the cross sectional area, side of the beam area,
surface area, or what? More information is needed, please.
--
Jim in NC

[Morgans]

where do you enter the size of the thickness of the square?

"Philippe Vessaire" > wrote in message
...
> Morgans wrote:
>
> >
> > "Philippe Vessaire" > wrote
> >
> >> 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
> >>
> >> If you want check 180hp @ 3800rpm
> >> diam = 1026mm a = 68.4mm
> >
> > Is the area in the formula the cross sectional area, side of the beam
> > area, surface area, or what? More information is needed, please.
>
> the beam is diam*a*a.
> for the exemple, a square 68 x 68 length 1026.
>
> --
> Pub: http://www.slowfood.fr/france
> Philippe Vessaire ҿӬ
>

[Montblack]

("Philippe Vessaire" wrote)
> from Michel colomban (cricri, MC100, MCR01 designer)


"We're not worthy. We're not worthy."


Montblack :-)

[[email protected]]

On 28 Mar 2006 14:41:50 -0800, "
> 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.
>
>David Woolery

When I was ready to test my Ford V6, I bit the bullet and bought an
IVO Magnum prop. It's ground adjustable and all three blades adjust
simultaneously by cranking a large threaded cylinder in the hub. That
way you can flatten out the pitch so that the engine revs up to it's
maximum rpm while not moving.

I was unable to get the engine to rev past about 3,100 rpm without
repitching from the initial setting. I was reluctant to hold that
power setting for very long anyway as I was basically blowing things
off the walls behind me in the car port, and the prop was sucking sand
off the driveway and pitting the prop tips.

Corky Scott