Original Posted By: "John and Phyllis Smoyer"
Pietenpol-List: Rudder horn location
Re: Pietenpol-List: Rudder horn location
Original Posted By: "M&M Stanley"
Subject: Re: Pietenpol-List: Rudder horn locationIn a message dated 2/18/2006 12:11:26 PM Central Standard Time,jpsmoyer(at)verizon.net writes:Have any of you ever experimented with the vertical position of the rudderhorn? I've located it about where the plans indicate, although that location isnot dimensioned. What would happen if the horn were at a lower location? Reason I ask is that it seems like this would make for an easier (straighter)cable run from the rudder bar, maybe even avoid the need for a pulley or hardwood block to guide the control cable back to the horn. Thanks and best regards,John SmoyerJohn,If you locate the rudder horn down low, you will increase the torsional loadon the upper portion of the rudder, which could lead to Flutter. No worriesabout the cable run with hardwood fairleads. Definitely not pulleys. AC43.13says you can deflect a cable up to 7=BA without a pulley. It's much more thanthat, where the control stick to bellcrank pass under the seat, and because=20ofthe design load of the cables, there's not even a need for pulleys in thatlocation, either. Just don't use stainless cables where a change in directionisneeded. As far as rudder pedals go, they add a Lot of additional pieces that Mustbe there, or you will over stress the rudder horn. Just remember - 'If itisn't there, it can't break', and the Pietenpol motto : Keep it Simple !!Chuck G.NX770CG________________________________________________________________________________
Subject: Re: Pietenpol-List: Rudder horn locationIn a message dated 2/18/2006 12:11:26 PM Central Standard Time,jpsmoyer(at)verizon.net writes:Have any of you ever experimented with the vertical position of the rudderhorn? I've located it about where the plans indicate, although that location isnot dimensioned. What would happen if the horn were at a lower location? Reason I ask is that it seems like this would make for an easier (straighter)cable run from the rudder bar, maybe even avoid the need for a pulley or hardwood block to guide the control cable back to the horn. Thanks and best regards,John SmoyerJohn,If you locate the rudder horn down low, you will increase the torsional loadon the upper portion of the rudder, which could lead to Flutter. No worriesabout the cable run with hardwood fairleads. Definitely not pulleys. AC43.13says you can deflect a cable up to 7=BA without a pulley. It's much more thanthat, where the control stick to bellcrank pass under the seat, and because=20ofthe design load of the cables, there's not even a need for pulleys in thatlocation, either. Just don't use stainless cables where a change in directionisneeded. As far as rudder pedals go, they add a Lot of additional pieces that Mustbe there, or you will over stress the rudder horn. Just remember - 'If itisn't there, it can't break', and the Pietenpol motto : Keep it Simple !!Chuck G.NX770CG________________________________________________________________________________