KR> wing tip slop
Martin I'm in melb for a few days. How are you. Any more news on the Damage, Can it be fixed. Phil Matheson
KR> wing tip slop follow up to points raised by forum members ...
Thank you everyone that has responded ...your input has spurred me on to a deeper understanding of what is happening here ... I have now had another professional engineer review the WAF joint with the following conclusions drawn for 3/8 bolts Assuming that the coefficient of friction between the two WAF surfaces is 0.8, the WAF joint will resist about 2.5G by friction alone for 600 KG AUW aircraft (wing bolts tightened to 190 inch pounds of torque) and about 5.5G in total when the shear strength of the 3/8 bolt is included. This assumes a wing panel that has a centre of lift 1.0 meters outboard of the WAF bolt holes (my wing is a little longer and has a centre of area about 1.05 meters outboard, but then the wing twist reduces the lift towards the tip.) and the calculated maximum G force is likely to be conservative as it is based upon a bolt with a lower tensile strength than the AN bolts specified for our WAFs. This G force limit of 5.5 G relates to an aircraft flying at 600 KG AUW. So, provided that 1. The necessary assembly clearances are taken up by lifting the tip to the limit of its movement before tightening the bolts and 2. That -ve G manoeuvres of more than -2.5 G are avoided and 3. And that ground loads impose less than -2.5 G on the wing structure Then there will be no movement of the WAF fittings during normal operation. However, if any of these conditions are not met, or if the bolts are not properly tightened, then the WAF blades will move one to the other causing wear to the bolt holes and the bolts . I am thinking of applying Loctite "wick in" to the WAF blades after assembly to increase the friction and so improve my safety margins Cheers Martin Pearce - KR2 with Subaru EA81 + KR2 S with GMH Saturn - Both in my garage, neither registered or flying in Au ---yet! rocketdri...@optusnet.com.au
KR> wing tip slop ... the effect of marginally short bolts ...
I noticed that the both main spar and TE spar WAF bolts in my aircraft were within recommendation (ie the thread was inside the WAF fitting) but this meant that one end of the bolt had increased clearance in the WAF fitting hole as the thread is a smaller diameter than the grip diameter of the bolt. Today I purchased new bolts 1/8 inch longer, and yes, I will need an extra washer or two, but the bolt is a MUCH neater fit in the hole than the old one . gunna do a trial refit of the wing tomorrow wish me luck! Martin Pearce - KR2 with Subaru EA81 + KR2 S with GMH Saturn - Both in my garage, neither registered or flying in Au ---yet! rocketdri...@optusnet.com.au
KR> wing tip slop
Martin There should be NO movement at the wing tips unless you did not have the nuts on as well. and tightened when you did this test?? Pat Russo - Original Message - From: "Martin Pearce" <rocketdri...@optusnet.com.au> To: <kr...@mylist.net> Sent: Sunday, May 15, 2011 3:27 AM Subject: KR> wing tip slop > Just did a final(?) W & B before registering and hopefully flying the > first > of my two, now allocated the rego 19 - 7814 . However.When we put the > wings on (for the first time in over 6 months) we noticed about 1 inch > play > vertical at each wing tip . Fore and aft play seemed to be much less, to > the point that it wasn't noticeable.. > > > > I presume that some vertical play is necessary and a result of being able > to > fit the wing bolts, but how much is too much? Is there a spec? Couldn't > see > one in the one manual which came with my two 'planes . Would > appreciate > advice > > > > And if I have to reduce the play, does anyone have any recommendations > please > > > > Cheers > > Martin > > > > > > Martin Pearce > > - KR2 with Subaru EA81 + KR2 S with GMH Saturn > > - Both in my garage, neither registered or flying in Au ---yet! > > rocketdri...@optusnet.com.au > > > > > > > > > > > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html >
KR> wing tip slop
I think that sloppy bolt holes would cause this condition. Why have ANY slop ? Virg > > > I presume that some vertical play is necessary and a result of being able to > fit the wing bolts, but how much is too much? Is there a spec? Couldn't see > one in the one manual which came with my two 'planes . Would appreciate > advice > > > > And if I have to reduce the play, does anyone have any recommendations > please > > > > Cheers > > Martin > > > > > > Martin Pearce > > - KR2 with Subaru EA81 + KR2 S with GMH Saturn > > - Both in my garage, neither registered or flying in Au ---yet! > > rocketdri...@optusnet.com.au > > > > > > > > > > > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html >
KR> wing tip slop
At 02:27 AM 5/15/2011, you wrote: >When we put the >wings on (for the first time in over 6 months) we noticed about 1 inch play >vertical at each wing tip . Fore and aft play seemed to be much less, to >the point that it wasn't noticeable.. >++ Are you saying you have movement at the wing attach fittings? With the bolts installed, there should be ZERO movement of the fittings. Larry Flesner
KR> wing tip slop
Once the wings are bolted on, the play must be zero. If I understand you correctly. Find the cause and correct it. I certainly suspect that the bolt holes are too large and you will have to ream them out to the next size up. Don't take my word for it. I am sure you will get more replies on this. See N64KR at http://KRBuilder.org - Then click on the pics See you at the 2011 - KR Gathering in Mt. Vernon, Il - MVN There is a time for building and it never seems to end. Daniel R. Heath - Lexington, SC -Original Message- I presume that some vertical play is necessary and a result of being able to fit the wing bolts, but how much is too much? And if I have to reduce the play, does anyone have any recommendations please
KR> wing tip slop
Just did a final(?) W & B before registering and hopefully flying the first of my two, now allocated the rego 19 - 7814 . However.When we put the wings on (for the first time in over 6 months) we noticed about 1 inch play vertical at each wing tip . Fore and aft play seemed to be much less, to the point that it wasn't noticeable.. I presume that some vertical play is necessary and a result of being able to fit the wing bolts, but how much is too much? Is there a spec? Couldn't see one in the one manual which came with my two 'planes . Would appreciate advice And if I have to reduce the play, does anyone have any recommendations please Cheers Martin Martin Pearce - KR2 with Subaru EA81 + KR2 S with GMH Saturn - Both in my garage, neither registered or flying in Au ---yet! rocketdri...@optusnet.com.au
