Kevin: First of all, thank you very much for your mail. I really appreciate it.
Although this explanation sounds very interesting to me, I still have some doubts: 1.- I don't understand clearly the reason why the fail occurred with 2 people and not with one. Is it that with more weight to lift you need more power and that extra power (with two people inside) has exceeded the limit the fuel flow with the .030 could provide? 2.- Has the take of angle of climb anything to do with this problem ? Again, thank you very much for your response. Daniel Arditi, Buenos Aires, Argentina. ________________________________ From: Kevin Lee <[email protected]> To: [email protected] Sent: Monday, April 20, 2009 9:04:27 AM Subject: [ercoupe-tech] RPM Drop during Climb Out RPM drop during climb out I experianced this problem last year with my coupe C85 with Stromberg Keep in mind, My A&P also happens to be my CFI It developed a RPM drop of about 300 during climb out but as soon as leveled out engine regained lost power First reared its head during instruction and on about my 6th touch and go it showed up * got back on the ground safely really quick Note: Very High pucker factor when it first happened. We proceded checking the following locations for the problem. checked Fuel flow to carb / fuel lines ect. no problems found checked carb float setting and clean cked ok engine specs such as compression checked ok looked at plug wires, they looked ok but changed anyway checked mags for output cked ok He thought he had correcteds as his solo test flights showed no RPM drop. (He weighs approx 150) Then we both went up together and dang their it was AGAIN Sent carb to Aircraft Systems in Rockford IL to do detail inspect/rebuild. As soon as they opened carb the tech knew what our problem was and his test proved right. Needle in carb had neoprene tip, it had expanded due to age and or long term reaction to fuel Test results as I understand Flow past needle was checked and found to be .030 Tech mentioned it is to be at a minimum .048 So during take off (Climb out) it was fuel starvation, engine not getting required fuel flow. New stainless tip in carb Problem solved. Kevin N2583H (DVN)
