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Charlie, I believe that Tracy Crook and Bernie Kerr have done side by side
comparisons. I don't recall all the details, but my recollection is that
they were very similar at some speeds and diverged a bit at others, but
nothing dramatic either way.
Of course, Tracy was in his 4 and Bernie in his 6 so was not quite a one for
one, but I think a reasonable comparison.
Unfortunately, I can't recall the Lycoming Bernie had installed. Perhaps
Tracy will jump in - although have not heard from him on the list recently.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message ----- From: "Charlie England" <ceengland@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, July 11, 2004 9:01 AM
Subject: [FlyRotary] Re: Powersport RV8 in the RVator
DaveLeonard wrote:
>> Dave you need to write up an article for Rvator!!.
>>
>>
>>
>
>You bet I will. As soon as I install my intersection fairings and my new
>Harmon rocket gear leg fairings and improve cooling and "borrow" an O2
>bottle from the hospital. Perhaps even a bigger prop. That might be a
good
>chance to go up into the flight levels and give Tracy Sailor a number to
>work toward.
>
>That would make a good article. :-)
>
>Dave Leonard
>
A couple of questions/comments:
Tracy & Ed both seem to have respectable fuel burns at *low* cruise
settings. Unfortunately, other RV flyers seem to be quoting burns in the
10 GPH range at cruise speeds noticably lower than Lyc powered RV's at
the same burn (and 'reasonable' VFR altitudes).
10 GPH is the ~burn of a 180 Lyc at 75% power (full throttle, properly
leaned, 7k-8k feet). Is anyone able to match Van's published 75% cruise
numbers, both speed & fuel burn?
One of the biggest knocks against the rotary is the perceived excessive
fuel burn. I think that we need to see side-by-side flights with Lyc 160
& 180 HP RV's at commonly flown VFR cruise altitudes (6k-10k feet).
Until there are well documented comparisons showing similar fuel burns,
the fence sitters will remain on the fence or fall on the Lyc side.
Comments?
Charlie
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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