There are lots of variables of course but I usually plan on 160 KTAS for anything between 9000’ and 13,000’ (density alt) running full throttle, 2300 rpm and LOP at around 10 gal/hr fuel flow. Higher up (up to 17000’) I’ll increase RPMs to maintain the 160 ktas. No data above FL180, I’m on basic med and use cannulas for O2.I may be looking over it somewhere but was wondering if that exists somewhere. Would help for planning to know what performance to expect at different altitudes.
Thanks
I may be looking over it somewhere but was wondering if that exists somewhere. Would help for planning to know what performance to expect at different altitudes.
Thanks
Wow - the real-world scatter in that data! Graph 1 looks like you were patterning a turkey gun.
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There's an ap for that............ Isn't there an ap for EVERYthing?? I have not used it yet but have heard good things about it. Might be useful; might not. It is (appropriately enough) called True Airspeed Calculator. The ap might be TruAirspeed. Put in IAS, altitude, OAT, Kollsman (aka barometric pressure in "Hg). Readout: TAS; Mach number (only if you are in a -4 or -8......); density altitude and pressure altitude. And, as I recall it's FREE........likely or it wouldn't be on my phone.........I may be looking over it somewhere but was wondering if that exists somewhere. Would help for planning to know what performance to expect at different altitudes.
Thanks
That is WAY more than slightly rich! At 9-10K, I am getting 165 KTAS @ 10.5 - 11 GPH depending upon the day. At 14K, I am getting the same speed but under 9.5 GPH. Granted that is with balanced injectors and optimal ignition advance, but you have that as well with SDS. I can get 175+ true when ROP at 13 GPH.Thanks for the info. I'm running a SDS EFII system and so far have about 50 hours in the plane. All of my other airplanes have been Rotax engines so I fly slightly rich of peak as of right now. Don't want to screw up anything by trying to run lean of peak. My generic flight planning is for 15 GPH and 165 knots but haven't flown anywhere higher than 8500ft. Just trying to get a baseline for what everyone is seeing on fuel flows and true air speeds at different altitudes.
The ap might be TruAirspeed. Put in IAS, altitude, OAT, Kollsman (aka barometric pressure in "Hg). Readout: TAS; Mach number...
I'd be really interested in that underlying data. My wife is a statistician and I might bother her for some help. PM sent.Echoing Bob, lots of variables, with the big one being "how much fuel do you want to burn?". With that qualifier, here are a couple of graphs that show data downloaded from my G3X after long cross-country flights at different altitudes. So, real world results, bugs on the wings and all. If interested in an excel file with the underlying data, PM me and I will send it along. Sidestory: I teach a statistics course, and each year I ask your question "how high should I fly?", give my students the data, and let them evaluate RV-10 performance. Fun stuff.
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