http://i1101.photobucket.com/albums/g427/epsound/Spar.jpg
Hello engineers,
I am a new builder. I do however have what I consider good 'gut' instincts. My gut however still doesn't make me an engineer/builder with appropriate experience and knowledge. So I place this dilemma upon the great VansAirForce alter for comments and input.
Situation---This section of my 9A spar was grinded down prior to my purchase (preowned kit). I am half way towards removing this for total replacement. The picture shows the grinded area. This is the upper section of the left wing spar. This is the only part that has be grinded to fit into the fuse [which was 1:50,000 of an inch too narrow at the top. Subsequently the depth of the grinding measures 1:50,000 of an inch.
Reason for question/dilemma---during the time I have been methodically removing it, I have had three sets of eyes-on from an engineer, and amateur builder, and one professional RV builder. Below are their comments.
1. Engineer--this is minimal and doesn't affect its integrity
2. Pro builder--this doesn't give me 'heartburn.' The amount of area grinded is insignificant and I would fly it with this spar. It's not an aerobatic.
3. Amateur builder---This should be replaced because is might be open to hairline fractures from hormonic frequencies and/or operating vibrations.
I have no issues with just replacing the spar. However I must consider the cost ($2000). In other words, if this really isn't necessary then the time and money could be exhausted in other aspects of this build.
I don't want to appear haphazardly or like I'm trying to cut corners. But then, who am I to argue with serious experience and knowledge. So far, the 'Leave it alone' are winning 2 to 1.
Question---if you have specific expertise that speaks to this, I humbly ask for your input and thoughts.
Respectfully,
E.
Hello engineers,
I am a new builder. I do however have what I consider good 'gut' instincts. My gut however still doesn't make me an engineer/builder with appropriate experience and knowledge. So I place this dilemma upon the great VansAirForce alter for comments and input.
Situation---This section of my 9A spar was grinded down prior to my purchase (preowned kit). I am half way towards removing this for total replacement. The picture shows the grinded area. This is the upper section of the left wing spar. This is the only part that has be grinded to fit into the fuse [which was 1:50,000 of an inch too narrow at the top. Subsequently the depth of the grinding measures 1:50,000 of an inch.
Reason for question/dilemma---during the time I have been methodically removing it, I have had three sets of eyes-on from an engineer, and amateur builder, and one professional RV builder. Below are their comments.
1. Engineer--this is minimal and doesn't affect its integrity
2. Pro builder--this doesn't give me 'heartburn.' The amount of area grinded is insignificant and I would fly it with this spar. It's not an aerobatic.
3. Amateur builder---This should be replaced because is might be open to hairline fractures from hormonic frequencies and/or operating vibrations.
I have no issues with just replacing the spar. However I must consider the cost ($2000). In other words, if this really isn't necessary then the time and money could be exhausted in other aspects of this build.
I don't want to appear haphazardly or like I'm trying to cut corners. But then, who am I to argue with serious experience and knowledge. So far, the 'Leave it alone
Question---if you have specific expertise that speaks to this, I humbly ask for your input and thoughts.
Respectfully,
E.
Last edited: