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Before closing up the top of the TailconeBefore closing u

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Tim(at)MyRV10.com
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Posted: Sat Nov 11, 2006 5:47 pm Post subject: Before closing up the top of the TailconeBefore closing u

John,



I don't think you have to worry about wrecking the tailcone.  I just

would suggest that since there are larger holes there,  you may want

to take an additional step and double up that longeron.  The longeron

gets joined from tail to fuselage with a set of bolts, so it can't

be a huge problem.  What I would do, is just match drill a section

of the same type of angle, and lay it on top of that longeron, but

pass the shelf bolts all the way through both pieces.  It would

form a sideways T.  You could make the piece about 6" longer than

the shelf width, and then put screws or bolts on about 3" spacing

down the length of it. (adjusting the spacing so it looks nice with

the 2 shelf bolts) That should double up nicely on the longeron I'd

think, and it would be probably stronger than original at that point.

You may still want to run it by Van's to see if they like that idea,

but that would be my suggestion, and I myself wouldn't feel

uncomfortable with that.  I'm sure you didn't ruin the tailcone.

Didn't mean to sound in any negative tone.  Just wanted to make sure

that before other people drill large holes, they think of the various

options to keep structural strength.

Tim Olson - RV-10 N104CD - Flying

do not archive



John Jessen wrote:

[quote] 

 

 It's always good to nit pick.  I did think about that, and figured that the

 longerons going across might actually be of some stiffening benefit if the

 plane wants to hit something solid and those seat belts decide to buckle the

 longerons, which they probably would do.  The holes, of course, being firmly

 filled with the bolts.  I may be wrong, and thus my entire tailcone is

 ruined and unsafe.  Oh, well.  

 

 If I were to do it again, I would use something smaller, even simply pop

 rivet a lighter angle.  I had longeron material left over and went ahead

 with trying to beef up the structure.  

 

 Do not archive

 

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jjessen

Joined: 22 Apr 2006
Posts: 285
Location: OR

Posted: Sun Nov 12, 2006 10:14 am Post subject: Before closing up the top of the TailconeBefore closing u

Thanks, Tim.  I know my tailcone is not ruined.  I had already thought about

the doubler.  I know about contacting Van's.  I even carefully considered

the holes before drilling.  And, as others, I do appreciate your public

concern.  



John 



Do not archive



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jjessen

Joined: 22 Apr 2006
Posts: 285
Location: OR

Posted: Mon Nov 13, 2006 1:35 pm Post subject: Before closing up the top of the TailconeBefore closing u

Since the time the worry about holes I drilled in the longerons of the

Tailcone came up as a public discussion on the web, I did go to Van's for

their opinion.  The engineers there felt the same as I did, which made my

day, since my logic at the time seemed sound, but one never knows if one is

not a structural or aeronautical engineer.  The reply is below.  I believe

that Tim's cautions are sound, however.  Careful when you drill or cut into

a major structural piece (the thought about putting in an access panel in

the skin comes to mind).  Think it through, ask questions of Van's and

others with engineering degrees or just sound building experience, etc etc

before proceeding.  



John Jessen

  #40328



Van's reply from Scott Risen:  



John,  ran this by engineering and they have no problem with

it....especially since you are adding 'reinforcement' of sorts to the tail

cone.  The holes themselves are no different than the HS attach bolts

farther back on many of the RV's and will not compromise the strength of the

longerons....carry on!  van's



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