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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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 Posted: Sat Jan 08, 2011 5:08 am Post subject: Need the type of material for front wing spar (Sparweb, Ste |
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While I do not have the information you seek, I do recall a few RV-10s
advertised for sale with 120 gal fuel capacity, built by someone in the
mid-western US, maybe Kansas.
On 1/8/2011 5:46 AM, Vijay Pisini wrote:
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Hello,
Does anyone know the type of material used (T2024 T4 etc) for front/main wing
spar parts (Sparweb, Stepped bar, Doubler)? The front spar comes assembled with
these three riveted together.
It is not appropriate if I do not mention as to why I need it. So here it
goes...the mission is Around The World in RV-10. I shared this info with fellow
RV-10 builders at OSH'10 Camp Scholler. Neil Colliver gave good piece of
information (through email, though he suggested not to make a major mod such as
this for various reasons) and Bob Condrey encouraged/insisted on running the
numbers first before going forward with outboard tank idea. Obviously as
everyone on this list knows that Van's doesn't want to give any engineering info
on this.
I need the material information to model the wing in the analysis that I'm doing
with the help of two of my colleagues who are familiar with modeling and
simulation. This is to add an extra tank (outboard tank...same size as original
inboard tank) and make sure that the structure can hold the extra load on the
wing. FEM analysis is almost complete (3-4 months in the making) and want to
make sure that the material is the right type of material.
The tool we are using is Auto Desk Inventor. We are not able to model the skin
correctly in this tool, but the take away from this analysis is the trend (as we
can't get exact numbers unless we model each and every part in the wing
including the rivets). By that I mean the Safety Factor trend (increase or
decrease...increase is good) with and without beefing up (different options of
beefing up) the spar structure. The area in spot light is the gap (1 ft gap)
between the two tanks (thanks to Neil who passed the conern to me concentrate on
this area as expressed by Van's itself) where the loads are concentrated because
the two tanks themselves add strength to the structure (spar) where they are
located. With the modeled wing, the safety factor will tell as to at what "g"
the structure with break. My goal is to keep this "g" above 150% of 3.8 which
is what a utility category aircraft is designed for in general. So far, the
results are encouraging. Van's says that as long as we can keep the "g" below
3.8, we probably do not need to worry about beefing up the structure with
outboard tank installed...but I can't guarantee that I'll be below 3.8 in severe
turbulence.
I want to mention that this sort of adventure (building the airplane for this
mission and flying it) is not for the faint-hearted or the nay-sayers. For an
adventure like this, I need to push the envelope a bit, but it should be a
calculated risk and not a blind one. My plan is to have 225 gallons of fuel for
couple of long legs (eg: California to Hawaii)...yes, I'll be over the gross wt
by aournd 15%-20% at the start of these legs. Fuel management is another
challenge and I have a locked-in plan for it (thanks to Detlef Heun's design
which is a part of my fuel management design...he is in the middle of his Flight
Around the World adventure on his RV-7 with his wife Liliana).
Any help with constructive criticism to get me through this build process from
you all is very much appreciated. So far, I have completed the empennage (not
the attach portion though, since I don't have room in my garage), Ailerons,
Flaps, 3/4th of 2 fuel tanks (yet to seal them). Copied rudder trim from Tim
Olson's website. Passed 500 hrs (total time) mark...and in 3 years from now, my
plane should fly. Once the analysis is done, I'll upload all the details on my
web page (not updated in a long time). Please let me know if anyone has a
question for me. Thanks.
vj
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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dlm34077(at)q.com
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| Posted: Sat Jan 08, 2011 7:03 am Post subject: Need the type of material for front wing spar (Sparweb, Ste |
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They were built at an airport just north of KSAT. www.airnav.com is down now
but a fuel price check of KSAT area will yield and airport about 10 North.
Contact the field ; there were two aircraft being built with 120 gallon fuel
in the wings.
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weeav8ter
Joined: 01 Mar 2010
Posts: 16
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| Posted: Sun Jan 09, 2011 3:41 am Post subject: Need the type of material for front wing spar (Sparweb, Ste |
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I was up at Tru Trak last year having some work done on my AP and was looking at their RV10. They have two additional 60 gallon tanks on theirs. One inboard like normal and then the same tank on the abutting outboard portion of the wing. I was talking to Jim Younkin, who owns Tru Trak, about it. You might want to give him a call he might be able to give you some insight into his research on installing his.
Wayne Edgerton 40336 N602WT
do not archive
[quote][b]
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