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Hi Rob,
On Thu, 16 Jan 2003 01:49:20 -0500 "Rob Logan" <Rob@Logan.com> writes:
1. The wingtip is different
I installed wing extensions which have the 320 tips.
2. The POH claims the wing fuel quantities are different (11 vs 16 gal). If the wings are the same, why?
I believe the original plans called for fuel in the 'D' section. I have
fuel in between the ribs and also in the last section before the wing
tips. This allows about 53 gal total including the header.
3. Same airfoil, but 320 fairing is at flap -7*, 235 fairing is at flap 0* even though the flap is raised to -7* at cruise. Also, 320 flap max is +45* while 235 is +25* (is this because the 235 tail is smaller?).
I fly cruise with the flaps up about 5 degs from the faired position. I
also changed the hinge point to the lower skin which allows 40+ deg but I
seldom use more than 30 when landing. I don't know if the std tail is
smaller but like the wings, didn't think there were any major changes
except the horiz stab a bit taller. 4. Max Gross wt for 320 is 1685 (more recently 1800), 235 is 1400 pounds. Maybe the skin molds are the same (?) but are the spars the same?
My gross was set higher than 1400 lbs. (it's secret but plainly
displayed on the data plate <G>)
If you are flying the 235 with a 320 engine, could you elaborate on specs and performance, including dealing with the engine weight difference.
Two other items were changed per suggestions from Dr Don G. I installed
an extra layer of glass in the D section of the stub wings. I added the
third hinge between the existing two on the rudder.
A dorsal fin was added which adds about five inches to the rear tip of
the rudder and begins at about the same point on the fuselage as the
upper fin. I changed the donuts to Ongs shocks and changed the nose gear
to the strut type.
I have about 75 hrs on the 235/320 with a 3 blade MT prop which was
changed from a Demuth wooden one about 25 hrs ago. I operate off a 2300
turf strip and I couldn't slow down enough to make safe (consistent)
landings without the 'flat' prop pitch. I moved the rear baggage
bulkhead back about six inches and have the hyd pack behind it. My
battery is (a small sealed 17 AH) on the right side engine mount. When I
changed from the wooden prop to the MT, I re weighed and didn't need to
change anything to remain in the envelope under all anticipated loading
conditions.
About performance: I'm not a speed freak and normal cruise is 2250 RPM
and 23 MP. Mostly this reduced setting is for less noise (I have a ANR
headset but climb power is still too noisy). I burn about 7.3 GPH. My
Son & I flew to Oshkosh last year with full fuel, normal baggage for two,
370 lbs (our combined weight) and indicated (GPS) around 190 MPH ave
round trip. Previously, I have over 1000 hrs in a Mustang II with an
0-360 CS Hartzel and I fly the Lancair at similar speeds but have a 2.7
less fuel burn. Let me know if I've overlooked an item of interest. Earl
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