First thing to do is get your tach checked. Second, 6 gph is not too far off the mark. Fuel flow limits for a C90-12 at 2200 rpm is 5.5 to 5.9 gph. 2200 is 70% power.
John Cooper, A&P Skyport Services PO Box 249 4996 Delaware Tnpk Rensselaerville, NY 12147 518 797-3064 Fax 518 797-3865 www.skyportservices.net _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Willis Sent: Tuesday, April 10, 2007 9:57 AM To: [email protected] Subject: [ercoupe-tech] Fuel consumption Hi guys and gals, I know this has been discussed before but I can't find any specific clues to my problem in the archives. I have a 1966 Alon A2 with a C90 and the standard prop. Fuel consumption seems to be quite high, higher than it should be. I've been waiting for some fine weather to fly a reasonable distance to give a good measure, to avoid the taxi/climb bias of the short trips over the winter. Last Friday I flew solo a one and one half hour trip and it drank 32 litres, or 23 litres per hour (6 USG per hour). I flew at 2,000 feet at 2,200 rpm which gave around 82 knots IAS. The engine is pretty old and has done 1,200 hours, about 300 hours since a major top end overhaul. It runs very sweetly and is consuming only 0.2 litres of oil per hour (less than half a US pint per hour). The prop is only a couple of years old and in very good condition. At my last service I had the engineer take the floorboards up and have a good check for fuel leaks and he found nothing. So is this excessive consumption? It seems well above book figures - and if so any ideas how to investigate further. I'm concerned about range at this stage - 3 hours including reserve - although with Avgas here at $9.50 a USG it is a little expensive as well! Thanks, Mike
