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kirkhull(at)kc.rr.com
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 Posted: Mon Nov 20, 2006 4:18 pm Post subject: prop pitch and reduction |
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I was just wandering what pitch people were running with what reduction ratio?
I was told by the prop shop that with a 100 HP and 2.2 reduction on a 70” warpdrive to use around 14 deg. I have been using 17 ˝ deg and getting a little noise from the reduction at low power settings
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Malcolmbru(at)aol.com
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| Posted: Mon Nov 20, 2006 4:42 pm Post subject: prop pitch and reduction |
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is the plain level is the prop hub perfectly vertical? do you realy have 17%? becouse 3% would give you a realy weard rpm setting at max rpm mal
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kirkhull(at)kc.rr.com
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| Posted: Mon Nov 20, 2006 8:11 pm Post subject: prop pitch and reduction |
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The procedure done to set the pitch was correct with 17 ˝ being the correct pitch ( using same equipment used to set pitch on connies ) I think that the prop shop was thinking that was a lot of pitch for an 80HP engine but the 100 HP seems to have no problem with it other then the slight noise at idol. I was just wandering if others were using that much pitch with a similar reduction ratio. I have a Subaru with a 2.2 reduction. What are others running?
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Malcolmbru(at)aol.com
Sent: Monday, November 20, 2006 6:41 PM
To: kitfox-list(at)matronics.com
Subject: Re: prop pitch and reduction
is the plain level is the prop hub perfectly vertical? do you realy have 17%? becouse 3% would give you a realy weard rpm setting at max rpm mal
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propellerdesign(at)tele2.
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| Posted: Mon Nov 20, 2006 11:44 pm Post subject: prop pitch and reduction |
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Kirk,
100 HP at what engine / prop RPM ?
and what it top Speed?
with 100 HP you will make 115 - 120 MPH SL ??
say 2500 RPM and 117 MPH for an example will be around 16,7 deg (at) 75% of the radii.
2400 RPM and 117 will be 17,35 deg (at) 75% radii
2300 RPM and 117 will be 18 deg (at) 75% radii
Jan Carlsson
www.jcpropellerdesign.com
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kirkhull(at)kc.rr.com
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| Posted: Tue Nov 21, 2006 6:13 am Post subject: prop pitch and reduction |
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I have a stratus 100 HP Subaru conversion with a 2.2 to 1 reduction and a 70 in warpdrive. The max Hp is at 5400 RPM but I am getting 115 mph at 4500 RPM and full power
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of JC Propellerdesign
Sent: Tuesday, November 21, 2006 1:44 AM
To: kitfox-list(at)matronics.com
Subject: Re: prop pitch and reduction
Kirk,
100 HP at what engine / prop RPM ?
and what it top Speed?
with 100 HP you will make 115 - 120 MPH SL ??
say 2500 RPM and 117 MPH for an example will be around 16,7 deg (at) 75% of the radii.
2400 RPM and 117 will be 17,35 deg (at) 75% radii
2300 RPM and 117 will be 18 deg (at) 75% radii
Jan Carlsson
www.jcpropellerdesign.com
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propellerdesign(at)tele2.
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| Posted: Tue Nov 21, 2006 7:25 am Post subject: prop pitch and reduction |
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Kirk,
My guess is you have 85 - 90 hp at 4500, The stratus page didn't say max torque, (should be in that rpm range)
If you want all Power (and if engine have) at 5400 my "guess" is that you need 17 - 17,5 deg at 75% (not at tip)
and if you have just 90 hp at 5400 you want 16,25 - 16,75 deg
If you know where max torque is, it is a good thing to prop it so you are around or above that rpm at climb speed.
I think if you reduce the pitch little you will gain speed and climb
Jan
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kirkhull(at)kc.rr.com
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| Posted: Tue Nov 21, 2006 8:25 am Post subject: prop pitch and reduction |
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Thinks I will try 16.5 and see what happens. Max torque is at 3800 RPM
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of JC Propellerdesign
Sent: Tuesday, November 21, 2006 9:24 AM
To: kitfox-list(at)matronics.com
Subject: Re: prop pitch and reduction
Kirk,
My guess is you have 85 - 90 hp at 4500, The stratus page didn't say max torque, (should be in that rpm range)
If you want all Power (and if engine have) at 5400 my "guess" is that you need 17 - 17,5 deg at 75% (not at tip)
and if you have just 90 hp at 5400 you want 16,25 - 16,75 deg
If you know where max torque is, it is a good thing to prop it so you are around or above that rpm at climb speed.
I think if you reduce the pitch little you will gain speed and climb
Jan
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