Before I start this video there has to be a public service warning.
Please note this video does feature extensive scenes of spreadsheets and occasional maths and
if you're not completely bored already and you're still here let's get started.
Since I started flying the sr22 which I've been doing recently on this channel
I've had a few questions from people who've started asking me what's the
difference in costs between the rental costs and fuel charges associated with
the sr22 compared to flying an sr20. And of course this is a really good question
because whilst you're paying a higher rental fee per hour for the sr22
compared to the sr20 because you can go further and faster does it actually work
out more economical on like a cost per minute basis to fly the faster aircraft
than the slower one? What I'm gonna do is share the screen with you so you can see
the calculations that I'm going through here and hopefully if you guys are
trying to make the same kind of decision you can kind of follow this process and
hopefully this will help you out there as well. So I've just set up this new
spreadsheet it's just in Excel I'm gonna put up one constant at the top. The last
fuel that I got from Moorabbin Airport was yeah it's it's pretty sad it was $2.02
cents per litre I was paying at Moorabbin. Now I'm sure you guys have got
AVGAS cheaper than that where you are but the good thing is with this
spreadsheet is you could just change that fuel cost and it updates the
calculations later. We're going to do a column for the sr20 we'll do a column for
the sr22. And the dry rental rates that I pay are $240 for the sr20 and $300 for the
sr22. Now we want to work out how many liters per hour both aircraft burns so
I'm gonna do this at cruise rates. I'm not gonna worry about climb and descent
and everything I'm just gonna go for a leaned out cruise rate and do a
comparison between the two. So leaned out the sr20 burns 8.5 gallons
per hour so if I just times that by 3.8 I'll get 32.3 liters and the sr22
that's 14 gallons per hour we had it down to the other day so in litres that
comes to fifty three point two liters per hour. So fuel costs
per hour leaned out we can put that in here fuel cost per hour we'll just be
this thirty two point three times the $2.02 and the same for the
sr22 this one times this cell. And so we've got 65 for the sr20 and one
hundred and seven dollars for the sr22. So now we can start to work out well
what's our wet rate per hour?
Which will simply be the hourly fuel cost plus the
rental rates. Three hundred and five for the sr20 copy the formula across here
four hundred and seven dollars for the sr22. So what I'm going to do is just get
the wet rate per minute here as well which is just that divided by sixty
because now we're going to be looking at the cruise speeds of both of them and
over a certain period of time does it actually work out more cost-effective to
go one distance in the sr20 compared to the same distance in the sr22?
Cruise TAS that we use for both these aircraft for the sr20 I'm going at 135
for the sr22 165. Again you can put your own numbers in here if you have slightly
different numbers that you're using. So we can work out a miles per minute, if we
can spell, which will be the cruise TAS of course divided by 60 so we're doing
2.25 miles a minute in the sr20 2.75 in the sr22. So now we know how much the
aircraft is costing us wet rate per minute and we know how many miles we're
doing per minute we can work out the cost per mile just by dividing the two.
So cost per mile will be five dollars nine divided by the 2.25, $226. And again
copy the formula across here, two dollars forty seven. And that is
where we're actually getting a good comparison now so to go one mile in both
these aircraft the cost difference is not actually all that much, two dollars
twenty six for the sr22 dollars forty seven for the sr22. But you've got to
take other considerations in to... Got to take other factors into
consideration as well for example the sr22 is going to get you there faster so
if you want go longer distances and shorter spaces
of time then speed is of course a priority for you then go for the faster
aircraft. Additionally the sr22 climbs faster than
the sr20 so if you wanted to climb to get better tailwind for example your
climb in the sr22 is going to be quicker so you're gonna get into that tailwind
faster so you can actually achieve better ground speed quicker which is a
more economical way of flying. But just purely on a cost per mile basis that's
what I've been using over the last few days just to justify my move from Tango
Delta Sierra the sr20 up to Kilo Juliet November the sr22 that we were flying
the other day. I hope that was of some use I hope it was of some interest. On the
channel just a quick preview the air traffic control video that some of you
guys know that I've been filming over the last week that's almost done the
final edits almost done I'm looking to release that on the channel very soon.
Fascinating day it was really interesting behind the scenes at air
traffic control met some great people and I've got some great content for you
guys on how you can become an air traffic controller also some really good
tips for you pilots as well out there just on some of the things you can do to
make your life and air traffic controllers life a lot easier. So that's
coming to the channel soon. And make sure you follow me on social media I'm at
stef747 on Twitter Facebook and Instagram. I'm going to be announcing in
the next day or two a huge trip that's coming up massively tied into aviation
as well lots of opportunities to be talking to do some really key people in
the world of aviation not here in Australia. Thanks as always for watching
especially because there was like a whole bunch of maths in there but I do appreciate the support.