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  #31  
Old 05-30-2020, 12:45 PM
Dan 57's Avatar
Dan 57 Dan 57 is offline
 
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thanks Scott, exactly what I meant and most of us already knew

Since being retired and enjoying flying as such, I usually cruise at low power settings, e.g. 19/2000. My -6 has a CSP, and 2000 provides an eerie quietness when reducing from take-off settings.
19/20 results in a TAS of around 130 at 4-6000ft, more at the higher Levels. Typical FF 21l/h = which is also 5.5usg.
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  #32  
Old 05-30-2020, 06:17 PM
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Quote:
Originally Posted by GOFT View Post
Paul, how is the speed ratio calculated? Thanks
Speed ratio = Top Speed mph / Stall mph

The relatively high ratio for RVs (versus many other plane designs) is part of Vans "Total Performance" advantage which enables them to fly well both slow and fast.
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  #33  
Old 05-30-2020, 07:10 PM
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Quote:
Originally Posted by DeeCee 57 View Post
hey good one Paul!
And interesting indeed. I guess the fuel efficiency of the -12 might be explained (sorry -12 fans ) by the simple and old rule of drag being proportional to velocity squared... Flying slow with a frugal engine sure helps the MPG

Of note the difference in range between the -6 and -6A, no less than 70 miles
Agreed.

What would be cool to know but not available from Van's is the speed, FF, and range at 65% power for each model. I see those numbers published more for certified aircraft.
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  #34  
Old 05-31-2020, 08:59 AM
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Great idea!

I was surprised that the RV-15 wasn't listed.

However, with the inter-dimensionality of the new updated 9. I can see where speeds exceeding light speed would be difficult to compare to the other models.

Bob
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  #35  
Old 05-31-2020, 09:08 AM
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Quote:
Originally Posted by DeeCee 57 View Post
Of note the difference in range between the -6 and -6A, no less than 70 miles
Beauty of this chart it is comparing a very consistent build and flight test numbers. That said, there must have been some different flight test or math to have 70 miles difference between 6 and 6A in range. Only 10 mile difference between nose and tail wheel on the other models.
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  #36  
Old 05-13-2021, 09:21 AM
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ok guys, the table has been updated. Vans aircraft filled some of the blanks I had, and I did some interpolation on some of the data.
Also added the MPG fields (thanks for the idea PaulvS), the different power versions of each model, and some.

Now you can brag about your ship being the quickest, most economical, etc... well, in theory that is



and again, here a download of the file for anybody wanting to play around:
http://www.aerofun.ch/download/vans-...son-table.xlsx
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Last edited by Dan 57 : 05-13-2021 at 01:16 PM. Reason: links, figures 55% -14
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  #37  
Old 05-13-2021, 12:02 PM
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RV7A Flyer RV7A Flyer is offline
 
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Did you validate all of these numbers? I think the speeds for the 14 and 14A are wrong.

You have (14, 14A 210 HP, 14A 215 HP)

Top speed 205 203 216
Cruise 75% 195 193 203
Cruise 55% 195 193 203

Van's shows

207 205 218
197 195 205
174 172 182
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  #38  
Old 05-13-2021, 01:15 PM
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validate I did... not enough obviously
So, the -14 leisure speeds @ 55% now corrected, thanks RV7A Flyer
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  #39  
Old 05-13-2021, 01:16 PM
PilotjohnS PilotjohnS is offline
 
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Quote:
Originally Posted by RV7A Flyer View Post
Did you validate all of these numbers? I think the speeds for the 14 and 14A are wrong.

You have (14, 14A 210 HP, 14A 215 HP)

Top speed 205 203 216
Cruise 75% 195 193 203
Cruise 55% 195 193 203

Van's shows

207 205 218
197 195 205
174 172 182
with a 2 mph difference in listed speed, if it is real, after one hour of flying, you will only be 2 miles apart. Just saying
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  #40  
Old 05-13-2021, 02:29 PM
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Great work, Dan! That's really fun data to look at.
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