On Mooney (poh numbers are 5kts-10kts higher),
55%: 145TAS at 6GPH
65%: 155TAS at 8GPH
75%: 165TAS at 10GPH
Given avgas price, something to think about on Speed vs MPG, is 10kts worth 2GPH?
For DA40ng, given (UK) price of JetA, I wonder if it make sense to fly it at 40% power and not 92%? althought I was told flying it at 70% power lead to the lowest maintenance cost…
Ibra wrote:
I was told flying it at 70% power lead to the lowest maintenance cost
What engine maintenance costs would this describe for an engine with a fixed interval between total replacement, with no engine overhaul supported by the manufacturer or other parts suppliers? Accessory replacement as a function of increased RPM? Turbocharger replacements?
Ibra wrote:
The M20J at 8000ft does 145TAS at 6GPH, that is 0.15L/nm but I fly it WOT/2500rpm at 165TAS at 10GPH (the POH is is 175TAS)Acrually flying it LOP at 125IAS all the way climb/cruise/descent does the job for fuel efficiency
More like 7.5-8 GPH for 145k KTAS? Mine is a few knots slower than the book. Fully loaded it should do 164 kts on 10.1 GPH but I would sit in the high 150s. Let’s see if an overhaul and new engine mounts can catch me up. It was sagging a little.
Maule MX-7-180: about 34 l/hr @ 100 kt TAS (with extended MLG and 31” Alaskan Bushwheels and baby bushwheel); so about 0.34 l/nm.
Fuel consumption is about 5% more at MTOW, 5% less at “play” weight.
4 seats, of which 3 usable by adults with luggage and full main tanks, due to aft CG limit with glider hook, etc. – so about 0.12 l/pax.nm.
As with automobiles, there’s a fuel consumption penalty for true “off-road” capability. Still, it was more than 1 hour faster than CAT door to door from/to Glenswinton to/from Nurnberg. Longer trips would require a fuel stop.
X number of flights at max speed vs X+ number of flights at slower speed.
Hmh not sure I made sense there.
It should be more distance covered in the same hours.
Gazelle SA341. 160 l/hour jet-a1. 117kts cruise=1.36 l/nm.
But it saves the drive to the airport :-)
carlmeek wrote:
But it saves the drive to the airport :-)
On short distances the MPG is an irrelevant measure otherwise dragsters don’t exist
carlmeek wrote:
But it saves the drive to the airport :-)
It is a silly question, but at what distance does a helicopter beat a bicycle in travel time?
Assuming a proper full preflight inspection, startup sequence, takeoff, landing and of course proper shutdown upon arrival, I do think the bicycle will be faster for a few km (because you just grab it and go).
Of course economically, a bicycle beats each and every other mode of transport for short distances…
I’d rather beat or thrash my way into the air anyway possible before electing to get on a bike.
;-) ;-)