|
|
|||||||
| Register | FAQ | Members List | Calendar | Today's Posts | Search |
 |
|
|
Thread Tools | Rate Thread | Display Modes |
|
|
|
#1
|
|||
|
|||
|
Tangentially related, anyone else try seeing what the minimum possible fuel flow while staying aloft is for your plane? I needed to build a bunch of hours for insurance reasons while not going anywhere in particular very quickly, so I spent some time playing with this and got it down to about 12.5 GPH total (10500', 6.5 GPH front, 6 GPH rear at about 21" and 2250 RPMs). Couldn't get it much leaner without intermittent missing. 1975 P337G, no GAMI injectors on here. Photos attached showing EDM-960 display and airspeed.
Single engine with the front prop feathered at 10500' (while loitering over a rural airport with a 5000' runway) actually took more GPH to maintain altitude than with both engines running. -Ryan Last edited by Ryann : 02-08-23 at 05:45 PM. 
|
|
#2
02-08-23, 05:44 PM
|
||||
|
||||
|
That's good info on the min fuel flow. I see you were doing C172 type speeds but with an extra 50% fuel flow (vs the 8 gph of the 172).
I have the EDM 760 FF gauge installed. My understand is the 960 is a plug-and-play replacement for the 760 (won't fit in the same mounting spot though!) I think with trade-in, the upgrade only costs about $1500! I would have already done it, but it would require almost a complete redesign of my panel, so I've held off. Would LOVE to have one though! I bet you could cut it down even more by caging the front engine. I hear that the Skymaster is the only airplane that EXTENDS its range when operating on only one engine!  Last edited by mshac : 02-08-23 at 05:50 PM.
|
|
#3
02-08-23, 06:07 PM
|
|||
|
|||
|
Found the photos from my single engine minimum fuel flow test. Photos attached, looks like I ended up at 14.7 GPH on the rear engine to just barely maintain altitude close to Vx.
I'll try it again during the winter months sometime soon and see if I can get it down any further with cooler air available. And maybe see if I can maintain altitude at Vy for a little less drag.
|
|
#5
02-11-23, 03:37 PM
|
||||
|
||||
|
Low observable loiter
Once upon a time, I heard that a three letter agency has a 337 that provides top cover comms coordination, during certain circumstances, that powers waaay back, with low RPM, and goes for hours and hours and hour
__________________
David Wartofsky Potomac Airfield 10300 Glen Way Fort Washington, MD 20744
|
Hybrid Mode
