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
>
>
>
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