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lors01(at)msn.com
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 Posted: Thu Jul 13, 2006 1:48 pm Post subject: How to fly CS / Sube challenge |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> If it were not for the prop maker's limitations, huge torque variations of the 4 cyl engine and the antique nature of aircraft engine ignition timing control, the correct way to 'fly a CS prop' would be to leave the throttle wide open at all times and control power only with rpm via prop pitch.
Anyone read the latest RVator? This was the method used in the Eggenfelner Subaru / Lycoming fly-off written up in the latest RVator. The guys at Van's were so flabbergasted by this that they had to call Eggenfelner before they would believe it. The prop used on the EGG engine ( MT) had no red zone rpms when used on a geared engine (or maybe even Lycs?). The Sube fuel economy was virtually identical to the Lyc O - 320 but performance lagged a little.
This is one reason why the Rotary powered RV-8's did so poorly in the economy department. They were forced to use the same prop RPM as the Lycs as a test condition.
(Caution!! Brag Alert!)
BTW, my naturally aspirated 13B rotary has out performed every EJ-22 or 25 Sube RV installation that I've found reliable test results for. This includes the turbo and supercharged ones as well. (like the RVator test subject). 209 mph average in 2003 SUN 100 & 217.5 mph in 2004. I'd love to do a fly-off against one of the newer EGG H6 engines. Willing to travel up to tanks-full range to do this. Any of you Sube drivers out there willing to have a go?
Tracy Crook
13B powered RV-4 1600+ hrs.
[quote] ---
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rv8ch
Joined: 10 Jan 2006
Posts: 250
Location: Switzerland
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| Posted: Thu Jul 13, 2006 2:40 pm Post subject: How to fly CS / Sube challenge |
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| Quote: | (Caution!! Brag Alert!)
BTW, my naturally aspirated 13B rotary has out performed every EJ-22 or
25 Sube RV installation that I've found reliable test results for. This
includes the turbo and supercharged ones as well. (like the RVator test
subject). 209 mph average in 2003 SUN 100 & 217.5 mph in 2004. I'd
love to do a fly-off against one of the newer EGG H6 engines. Willing
to travel up to tanks-full range to do this. Any of you Sube drivers
out there willing to have a go?
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Tracy,
I think you'll get more takers to do a fly-off against your RV8.
Are there even any RV4s with a Subaru? The 4 is going to whomp
all over just about any other RV except the 3.
To the best of my knowledge, there is only one RV8 flying with
a Subaru, and that's Siggi's in Lithuania. I could be wrong.
Mine won't be flying for "a few more months". Once it is, I'm
gonna race anyone I can find! 
--
Mickey Coggins
http://www.rv8.ch/
#82007 finishing
do not archive
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_________________
Mickey Coggins
http://www.rv8.ch/ |
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flyeyes(at)mac.com
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| Posted: Thu Jul 13, 2006 5:36 pm Post subject: How to fly CS / Sube challenge |
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On Jul 13, 2006, at 5:33 PM, Mickey Coggins wrote:
| Quote: | | Quote: | Willing to travel up to tanks-full range to do this. Any of you Sube drivers out there willing to have a go?
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Tracy,
<snip>
Mine won't be flying for "a few more months". Once it is, I'm
gonna race anyone I can find!
--
Mickey Coggins
http://www.rv8.ch/
#82007 finishing
do not archive
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<snip>
Mickey, I think you'll find you're a little more than tanks-full range from Tracy....
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