gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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 Posted: Mon Jan 06, 2014 9:46 pm Post subject: MTOW of RV-6 with Lycoming O-320-D3G and 79" Sensenich Fi |
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Observation, personal experience and engineering judgment - my opinion only, not from calculation. The wing spar and attachment to the fuselage differ. The -6 spar is multiple layers of bar stock with the two wings joined at the center with 4, 1/4" steel splice plates. That makes it effectively a one piece wing with the -605 bulkhead bolted to it all the way across the width. I think it's 74 bolts. The -7 uses the -8 style spar with stubs that mount into boxes in the fuselage using 4, albeit large, bolts in each. I have experienced trying to wrap the -6 spar around a tree and believe the center section will not bend under any load my body can withstand. The -8, and I assume -7, has a hole outboard for the aileron push rod. I believe it got beefed up after the -8 demo plane loss but again it is different from the -6. The firewall structure of the -7 has only one diagonal on each side instead of the "X" braces on the -6. The rest of the fuselage and tail are effectively the same other than for differences going to matched hole CAD parts.
Perhaps using "weaker" was a poor choice of words. Is the -7 structure adequate? Yes. Does the -6 structure provide more margin? IMHO, yes. If 1800 lbs GW is OK for the -7, should it be OK for the -6. Again, IMHO, yes. FWIW I set my -6 GW at 1900 lbs so I'd always be legal as long as I felt I was operating safely.
Regards,
Greg
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