Original Posted By: Timothy Willis
Subject: Pietenpol-List: more on turnbuckles
Pietenpol-List: more on turnbuckles
Re: Pietenpol-List: more on turnbuckles
Original Posted By: Ken Bickers
Subject: Re: Pietenpol-List: more on turnbuckles
Subject: Re: Pietenpol-List: more on turnbuckles
Re: Pietenpol-List: Any thoughts on this idea for turnbuckles
Original Posted By: "Barry Davis"
Kyle,If I'm understanding your sketch, it looks like it would put a bending force onthe bolt, not pure tension. The tiger moth style puts all of the forces in-line.KenOn Mar 31, 2012, at 6:09 PM, Kyle85 wrote:> > One of the great things about building an experimental airplanes is that youcan demonstrate certain ideas and concepts. Turnbuckles are critical safety items,but I believe that there is a way to duplicate the function of an aviationgrade turnbuckle by using all aircraft grade parts for a fraction of the costand the satisfaction of overcoming a design problem. The picture below is somthingI drew up based on someones design that posted a picture of their turnbuckles.I am not an engineer, the reason I am posting this is to get opinionsfrom those of you that have some real experiences and have knowledge that extendsbeyond my own. In the end I want a safe airplane and not break my limitedbudget. Oh yeah, this turnbucke(if I decide to follow through with it) will onlybe used in some areas such as inside the wing and maybe a few other places.> > --------> Airspeed, altitude or brains: Two are always needed to successfully completethe flight.> > > > > Read this topic online here:> > http://forums.matronics.com/viewtopic.p ... 731#369731> > > > > Attachments: > > http://forums.matronics.com//files/turnbuckle_207.jpg> > > > > > > ________________________________________________________________________________
Kyle,If I'm understanding your sketch, it looks like it would put a bending force onthe bolt, not pure tension. The tiger moth style puts all of the forces in-line.KenOn Mar 31, 2012, at 6:09 PM, Kyle85 wrote:> > One of the great things about building an experimental airplanes is that youcan demonstrate certain ideas and concepts. Turnbuckles are critical safety items,but I believe that there is a way to duplicate the function of an aviationgrade turnbuckle by using all aircraft grade parts for a fraction of the costand the satisfaction of overcoming a design problem. The picture below is somthingI drew up based on someones design that posted a picture of their turnbuckles.I am not an engineer, the reason I am posting this is to get opinionsfrom those of you that have some real experiences and have knowledge that extendsbeyond my own. In the end I want a safe airplane and not break my limitedbudget. Oh yeah, this turnbucke(if I decide to follow through with it) will onlybe used in some areas such as inside the wing and maybe a few other places.> > --------> Airspeed, altitude or brains: Two are always needed to successfully completethe flight.> > > > > Read this topic online here:> > http://forums.matronics.com/viewtopic.p ... 731#369731> > > > > Attachments: > > http://forums.matronics.com//files/turnbuckle_207.jpg> > > > > > > ________________________________________________________________________________
RE: Pietenpol-List: more on turnbuckles
Original Posted By: owner-pietenpol-list-server(at)matronics.com
Good memory Tim, The eye bolts we used were from McMaster Carr and had rolled threads theirentire length. We used them for drag/anti-drag inside the wing. Seems likethey were about $1.00 each including shipping. We built a jig and pulled todestruction of around 5000 Lbs. The jig broke, but the eyebolt did not. Justbefore the jig came apart, the eye went from a circle to a slight oval. Wefigured that if you pulled over 5000 Lbs and broke the eyebolt, you werereally having a bad day and don't think that the wing would survive anyway.But as they walked up to the crumpled pile, they could say "Wow that reallylooks terrible, but it sure didn't hurt those eyebolts!" BarryNX973BP-----Original Message-----
Good memory Tim, The eye bolts we used were from McMaster Carr and had rolled threads theirentire length. We used them for drag/anti-drag inside the wing. Seems likethey were about $1.00 each including shipping. We built a jig and pulled todestruction of around 5000 Lbs. The jig broke, but the eyebolt did not. Justbefore the jig came apart, the eye went from a circle to a slight oval. Wefigured that if you pulled over 5000 Lbs and broke the eyebolt, you werereally having a bad day and don't think that the wing would survive anyway.But as they walked up to the crumpled pile, they could say "Wow that reallylooks terrible, but it sure didn't hurt those eyebolts!" BarryNX973BP-----Original Message-----