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Sep 18, 2012, 12:32 AM
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Scotland
Joined Jan 2010
672 Posts
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You may have the new blades with no negative pitch
Check my post 973 Joe |
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Sep 18, 2012, 10:24 AM
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Joined Sep 2012
4 Posts
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Hi Joe, indeed I don't seem to have any pitch on the blades. I read this topic from te start to more or less halfway, but not far enough it seems, why th do they change the blades to non-working anyway...
How much pitch is needed more or less? I have no reference you know... I do have a pitch gauge though 
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Sep 18, 2012, 04:19 PM
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Australia
Joined Jun 2010
1,606 Posts
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Quote:
Mick |
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Sep 18, 2012, 08:25 PM
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Elizabeth South Australia 5113
Joined Nov 2005
1,334 Posts
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Now regarding the pitch.....As Joe pointed out in in #973, there should be a "wedge" of timber on the blade where it bolts to the center hub.This wedge gives the blade a negative incidence ,helping the blades to spin
.It would appear as if this no longer happens with the H/K blades and so the T/E of the blade has to be lifted in some way. If you look at #973,you will see that a thin strip of wood has been attached to the rear underside of the blade, giving the blade the negative pitch that is required.............. Happy Landings Chris............. |
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Sep 18, 2012, 10:19 PM
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Joined Sep 2012
4 Posts
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Mick, I don't think the blade pitch depends on the tilt of the rotor. I'll go for 2 degrees negative to start with.
Chris: I've read post 973, thats why I had this question. Please define 'a thin piece of wood', how thin is thin? 1mm? 2mm?  I'll try some stuff to get to 2 deg and see what happens. I was just wondering if someone knew which angle works, and go from there.
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Sep 19, 2012, 12:45 AM
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Roodepoort, S.A.
Joined Sep 2009
140 Posts
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Most of my blades is 2.5deg neg.
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Sep 19, 2012, 04:44 AM
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Australia
Joined Jun 2010
1,606 Posts
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Quote:
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Sep 19, 2012, 12:29 PM
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Joined Sep 2012
4 Posts
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Quote:
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Sep 19, 2012, 03:47 PM
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Elizabeth South Australia 5113
Joined Nov 2005
1,334 Posts
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Re the pitch angle.......2 is good....3 is max........................
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