Does anybody know what the price is for just a
4130 Lycoming mount that fits a Vans RV6?
Don't know for a vans but Teamtango was asking $1000 for theirs,
which is still
cheap, considering,
Alex
Maybe it is time to re think the traditional steel tube mount for
composite airplanes. Perhaps the cowling can be used like the
Questair Venture.
Paul Lamar
Paul, My fuselage has wide stringers down both sides from the canard to the
rear of the lower fixed cowling. There will be embedded hardwood blocks as
hard points for canard,engine mounting and landing gear. I never compared
the weight to a tubular truss but went with the stringers so as to not have
a bunch of truss tubing running through the engine compartment making it
hard to fit radiators, cooling duct work and the exhaust system. This method
is fairly simple with a composite pusher configuration. Doing it in an RV
might be hard to get the load paths to reinforced areas and still have
maintenance access to the engine with only the top cowl removable.
george grimes
George, how strong do you suppose your stringers are to handle the loads,
are you calculating for about 6G ultimate loads?
Alex
Alex, I am designing to 10G. The stringers will 2" thick and 7" wide.
Theygo just below a 2" wide joggle joint where the skins are locally
reinforced with 6layers of 5.5 oz S2 glass at + or- 45 degrees to 2" beyond
the stringers top and bottom. The stringers are covered with 90 and 45
degree layers of the same S2glass then triaxial Kevlar 49 and two more
layers of S2 which will be the inner skin of the lower fuselage. At
hard points there will be additional S2 glass.There is also a floor of 3/8
core cell with two layers of S2 on each side running fromthe front gear well
to the radiator plenum with boxed in sections for the main gear.There will
be two vertical panels basically extensions of the front gear well side sunder
the floor to isolate control torque tubes from interference and stiffen
the floor.The canard mounts under the stringers as does the lower gear pivot
with the engine ontopof the stringers mounted off the PSRU gearcase. No
real plan for the rear of the engine but it will likely be hung from above
off the 20" tall tubular tower that attaches the wing to the sidewall
stringers.
Any place there is no floor,firewall, bulkhead, seat bottom or
back, instrument bay or other annoyance there will be 1/2" corecell for
buckling resistance of the skins. Everywhere else thinner skins are layed
up on the outer skins. I hope to have this much completed in2013 at which
point I will have it run on FEA. As long as I have adequate external skin
structure I can add to the inside if necessary to make the 10G limit.
I started on the female fuselage moulds in Nov 2012 and built 39 formers strip
plankedwith3/4 X 1-1/4 clear yellow pine. I put two layers of tooling cloth
inside the lower half mould yesterday. It was 36 degreesF so I had all day to
do it with nothing trying to set up when I left last night but cured today in
53 degree F temps. I spent last year CNC cutting patterns for the 4-Rotor
engine and PSRUwhichcould also be assembled as a 6-Rotor if I owned an oil
well. The patterns need sealed but I don't know if polyurethane or polyester
resin would be what to use to toughen the outside surface and waterproof the
patterns so that is on hold. I bought 3 RX-8 engines with the higest mileage
one 2300 miles and disassembled that one after watching Paul take one apart
at Sun-n-Funto get accurate measurements. Also in 2012 I got all the
bearings, seal sand planetary parts for the PSRU which is Borg-Warner
4407.
george grimes
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