N1BZRich(at)AOL.COM
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 Posted: Mon May 07, 2007 6:49 pm Post subject: Lightning vs Sport Cruiser..& Cruise to stall ratios. |
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In a message dated 5/7/2007 8:22:53 P.M. Eastern Daylight Time, ajhauter(at)yahoo.com writes:
| Quote: | | If the sport cruiser can cruise 138 and stall 33, that is a 4.2 cruise to stall ratio, you will be hard pressed to find anything above 4.0 that isn't sporting a jet engine. |
AJ,
Yes, in the old days, a cruise to stall ratio of 4.0 would have been considered leading edge. Today, I am not so sure. My Jabiru 3300 powered highly modified Esqual LS (with lots of Lightning Stuff) will cruise at 170 burning 5.8 gph at altitude and it stalls at 34 with the flaps down. That is a 5.0 ratio. With the new prop I am testing, it has a top speed at 5000 feet of 185 and that is with the hot OATs we are currently seeing. And I am still able to run it past redline so I could use even more prop. Down on the deck (I live close to sea level) I have seen 198 indicated and am pulling the power back to keep below the max rpm for the Jabiru. So what speed will a well built, well aligned, cleaned up Lightning really do when Nick finally selects the right prop for it? As Brian mentioned, a Lightning with VGs or the "in the works" tip extensions (and thus the much lower stall speed) should have a ratio right up there near 5.0.
But is the Lightning the airplane for everyone? No, not necessarily. Different strokes for different folks, so to speak. Some people like rivets. I guess that is why one of the new SR-22s seen at Sun-N-Fun had rivets painted on it.
Blue Skies,
Buz
See what's free at AOL.com.
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