Quote:
Originally Posted by Jim T
OK for the sake of discussion I have a RV-12 brochure dated 10/05/12 and here is what it says:
Top Speed: 135 mph
Cruise Speed: 131 mph
Cruise Speed: 116 mph
Stall Speed: 52 mph
Takeoff Distance: 700 ft.
Landing Distance: 525 ft.
Rate of Climb: 900 fpm
Ceiling: 13,000 ft.
Range (7500' @ 5500 rpm): 482 miles
Range (7500" @ 5000 rpm): 530 miles
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Quote:
Originally Posted by AlanTN
Jim the current POH under the same conditions lists 482 NM and 534 NM
Does your brochure really say MILES?
Quote:
Originally Posted by Jim T
Yes is does. Well actually is says "miles" not 'MILES". I tried to post exactly what it said and then noted MY two personal assumptions at the end.
Jim
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Jim, I don't have the proof of this, but I have long suspected that someone took numbers that were originally in miles and assuming they were NM multiplied them by 1.15 producing the 555 and 614 range numbers. Your brochure from 2012 is one piece of evidence that supports my theory.
On 11/11/11 I started a thread titled 'Max Endurance Fuel Burn?' to try to get a handle on this. Later that day, I typed the following in part:
Quote:
Originally Posted by AlanTN
What I was really looking for is the Maximum Range (Vbr) fuel consumption. According to the specs on Van's web site the Max Range is 614 miles.
They use 5000 RPM for the Max Range.
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This tells me at as early as November 2011 the website was using 614 miles at 5000 rpm for maximum range.
If that is what happened, then the POH should show 482 and 534 'Miles' rather than 'NM.' And those should have been the max range numbers on the Performance page for the RV-12.
Its just a theory, but it could partially explain the current discrepancy.