An additional potential problem might be that the elevator travel is set too high....... If the coupe has been converted to a D model, with the 85 hp engine, the elevatyor travel must be set to max of 9 degrees up. If left at 13 deg,or maybe set higher - would the airplane -with the additional power attain such a steep angle ????
I suspect there are many C models/ partially converted to D models - ie 1400 # gross weight.... but never limited elevator travel. I'm guessing now - that with the additional power one MIGHT be able to attain such a high climb angle as to affect the gravity flow from the cowl tank to the carb....thus leaning the engine sufficiently to cause low power output, and with full throttle max climb, if one raise the carb so high that the fuel woulddn't flow then even in a glide, one might not have time enough to refill the carb and float bowl, and lines and gascolater before making the off field landing.... I have never calculated the angle where this would happen ...but suppose one could with the mains on - say 12 inch blocks, then moving the tail down to attain a very high angle of "climb"; moving the tail down until fuel stops flowing to the carb....This would be fairly easy to do. Seems I do remember someone mentioning that they had replaced the fuel line from the firewall to the gascolater, with a smaller diameter line than specified , and the flow restriction at full power was sufficient to lean out the engine so that it would only run at partial power.. On some cowl tanks, the feed lines are in fact adjustable in the tank..... maybe if that type of cowl tank is installed, then the line is set too high...... Hope these thoughts help stimulate other thoughts and you find the cause....the solution. Is somethi8ng floating around in the cowl tank to stop up the outlet ???? Fly Safe - Have Fun Regards, Harry
<<attachment: winmail.dat>>
