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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Sat Sep 20, 2008 11:19 am Post subject: 1977 Cheetah |
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I just finished restoration of a Cheetah, 1670 TTSN. Engine by LyCon, who else. It dyno'd at 188 hp, leaned, at 2725 rpm. With a Power Flow, and a 61 inch pitch Sensenich [61 inch pitch], static rpm was just a touch over 2400 rpm, leaned.
Yesterday was the first flight. Climbed at 1500 fpm at 92 knots right from take-off (1536 feet) to 4500 feet. Straight and level at 4500 feet it easily ran over red-line. Too easily. Needs at least 2 inches more pitch. Flew to Lancaster pushing a 20 to 30 knot headwind all the way. Two hours into the return flight, I took it to 12,000 feet, turned red-line and then some, easily. Needs more prop.
Complete instrument panel upgrade. 2 430s, 340 audio panel and a 327 transponder. JPI EDM 700. Digital tach. Mitchell gauges, AuCountry eyebrow, Nu-Lites.
Paint and interior and this is as good or better than new.
Find phone numbers fast with the New AOL Yellow Pages!
[quote][b]
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Gary
AuCountry Aviation
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jwellum(at)aol.com
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| Posted: Sat Sep 20, 2008 5:48 pm Post subject: 1977 Cheetah |
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Very impressive!!! What mods were done to the engine? I have been curious about the performance of a cheetah with a few modifications.
Jeff
In a message dated 9/20/2008 2:20:37 P.M. Central Daylight Time, teamgrumman(at)aol.com writes:
| Quote: | I just finished restoration of a Cheetah, 1670 TTSN. Engine by LyCon, who else. It dyno'd at 188 hp, leaned, at 2725 rpm. With a Power Flow, and a 61 inch pitch Sensenich [61 inch pitch], static rpm was just a touch over 2400 rpm, leaned.
Yesterday was the first flight. Climbed at 1500 fpm at 92 knots right from take-off (1536 feet) to 4500 feet. Straight and level at 4500 feet it easily ran over red-line. Too easily. Needs at least 2 inches more pitch. Flew to Lancaster pushing a 20 to 30 knot headwind all the way. Two hours into the return flight, I took it to 12,000 feet, turned red-line and then some, easily. Needs more prop.
Complete instrument panel upgrade. 2 430s, 340 audio panel and a 327 transponder. JPI EDM 700. Digital tach. Mitchell gauges, AuCountry eyebrow, Nu-Lites.
Paint and interior and this is as good or better than new.
Find phone numbers fast with the New AOL Yellow Pages!
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t href="http://www.matronics.com/Navigator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Sun Sep 21, 2008 1:15 am Post subject: 1977 Cheetah |
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new lycoming cylinders, ported and polished. that's it
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Gary
AuCountry Aviation
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Mon Sep 22, 2008 6:54 pm Post subject: 1977 Cheetah |
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With porting and polish on new Lycoming cylinders, the O320 dynoed at 175 hp before leaning. Leaned at near sea-level, it went to 188 hp. As flown, it had a Power Flow and a 61 inch pitch Sensenich prop. I wonder how it will fly when the engine gets broken in.
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Gary
AuCountry Aviation
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flyv35b(at)minetfiber.com
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| Posted: Tue Sep 23, 2008 3:40 am Post subject: 1977 Cheetah |
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Fletcher should have certified the prop with a 63 2 pitch as well as the 61 2 pitch.
Cliff
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