> Claude, that is your wing tank gauge. Use up most of your wing tank fuel > so none will leak out when you remove the screws and then remove the > plexiglas. You will see a nice gauge in there. Replace the plexiglas with a > new piece. You may have to also replace the cork gasket in order to get it to > seal properly. > By the way, did you replace the parts you removed at Burlington, or did you > leave them off the plane? > > Syd Cohen > NC94196 > Wausau, WI
Hi Syd Yes I replaced the MLG lights and noticed an immediate and drastic speed difference when running my 7148 prop. Wierd part is when I use the 7150 it seems to make no difference. My local AI had a nice toy, an airspeed indicator and pitot tube with a long hose and a flat mout for attachment to the place with double sided tape. If you use a alcohol and wait a sec it will let go of the paint. We mounted it on each mlg and test flew the plane. Also mounted it on various points under the wings and on top of the tail and used the sticky tape and anchors to hold the tube back to the cockpit. Surprise surprise... The 48 had a much much wider propwash at low speeds than the 50! Since both props have been to Carolina in the last 6 months for non destructive testing (for cracks etc) and a pitch check (both had one blade slightly out of pitch from the other) I assume they are within spec. Anyway the big difference was how much airflow passed over the MLG lights on climb out and at full throttle cruise. For the 48 prop it was linear and stayed at 45-55 mph above the indicated airspeed. If I powered back from redline to a 2150 or so slow cruise It didn't change much. Now the 50 was like a storybook picture. The airspeed at full throttle climbout or cruise was only 7-10 mph faster and immediately upon powereing back even slightly was within 2-4 mph of indicated. The elevator is much more sensitive and the aileron control is about the same at any cruise speed (supposidly since they are almost entirely out of the propwash now) So after spending a whole day changing props and moving the pitot we both came to the conclusion that my 50 kept the propwash firmly against the plane where it should be and the 48 was a wide conical pattern propwash that placed more of the plane in the higher speed higher drag air. By the way the same applied to the nose fork. The top of the fork where it splits off was right at cruise with no snubber cable on both props. However with the cable in place it had to fly through 10mph faster air on the 50, and 40mph air on the 48! End result being the nose wheel drag almost doubles from 100mph cruise to 148mph propwash and the MLG lights are also dealing with 145 mph drag versus 100mph clean cruise air. So even though it was a higher pitch the plane flew and climbed faster with the higher cruise prop than the climb prop. When I removed that snubber and the MLG lights in Burlington it's no wonder I flew a different plane. Also as for the speed I flew the interstate e/w then the powerlines n/s and timed it in all configurations. With the 48 I averaged almost 8mph faster with the snubber and lights removed. With the 50 it was only an avg of 4mph difference but overall the 48 with the lights and cable was 11mph slower than the 50 with those items removed. I settled for replacing the lights until i can put in wing lights and the cable is staying gone. He also produced the sensenich equal to my 50 and I tried that. I was IN LOVE but he wont part with it. better climb and cruise and all that buffeting I hear around my canopy was gone gone gone. Seemed to have a really smooooooth flow past the plane. Nuff-fer-now Claude Wheelbarger six-two-zero Waynesboro, Va. (W13)
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