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Propellers
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 |
#2
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Propellers
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#4
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Propellers
"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 |
#5
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Propellers
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 Ò¿Ó¬ |
#6
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Propellers
("Philippe Vessaire" wrote)
from Michel colomban (cricri, MC100, MCR01 designer) "We're not worthy. We're not worthy." Montblack :-) |
#7
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Propellers
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 |
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