Original Posted By: "Kirk Huizenga"
Pietenpol-List: Re: Elevator horn geometry
Re: Pietenpol-List: Re: Elevator horn geometry
Original Posted By: "Dick Navratil"
Subject: Re: Pietenpol-List: Re: Elevator horn geometryIn a message dated 2/9/2006 5:01:38 PM Central Standard Time, Kirk.Huizenga(at)moundsviewschools.org writes:So my real question is - how much attention should we pay toward having our pivoting controls in line and symetrical? It seems like even a 1/16th in wouldintroduce a noticable amount of slack in control cables.Kirk,The plans built flipper horns, and bellcrank, will have slack in the lower cable, when in the neutral position. The holes in the horn, and pivot point all line up. The cables tighten up when in the up, or down position. Ken Perkins laid out a bellcrank that pretty much eliminated this condition of slack/ tight in the original plans. However, in your case, I think it will aggravate this condition, and I think the only way you will know for sure, is tolay out cardboard templets made from 12 pack beer carriers, pin the pivot points ofthe horn and bellcrank to a surface that has the plans dimension between them, tie your string to simulate the cables, and see what happens when you movethe templets through the arc. I would caution you to take the dimensions of your actual plane, rather than rely on what is called out in the plans. These Pietenpols...they're all different !!Chuck G.NX770CG________________________________________________________________________________
Subject: Re: Pietenpol-List: Re: Elevator horn geometryIn a message dated 2/9/2006 5:01:38 PM Central Standard Time, Kirk.Huizenga(at)moundsviewschools.org writes:So my real question is - how much attention should we pay toward having our pivoting controls in line and symetrical? It seems like even a 1/16th in wouldintroduce a noticable amount of slack in control cables.Kirk,The plans built flipper horns, and bellcrank, will have slack in the lower cable, when in the neutral position. The holes in the horn, and pivot point all line up. The cables tighten up when in the up, or down position. Ken Perkins laid out a bellcrank that pretty much eliminated this condition of slack/ tight in the original plans. However, in your case, I think it will aggravate this condition, and I think the only way you will know for sure, is tolay out cardboard templets made from 12 pack beer carriers, pin the pivot points ofthe horn and bellcrank to a surface that has the plans dimension between them, tie your string to simulate the cables, and see what happens when you movethe templets through the arc. I would caution you to take the dimensions of your actual plane, rather than rely on what is called out in the plans. These Pietenpols...they're all different !!Chuck G.NX770CG________________________________________________________________________________