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barry.collman(at)air-brit
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 Posted: Sun Jun 24, 2007 12:17 pm Post subject: 680FL & 680W Commanders |
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Hi All,
John Towner cannot seem to post anything on the chatlist at the moment. He blames it on an old computer and not a very good computer operator, but I don't believe the last option for one second!
Anyway, his message follows:
Dear TCFG Group,
We use to own 2 680FL's and 1 680W with the Garrett 331 dash ? engines making about 500 SHP. I think they were 8,500 gross aircraft. (all 3 of our 680 aircraft were the long fuselage aircraft) Basically none of the 3 would climb very well at gross weight and on one engine were really under powered. We had an engine failure on takeoff with one of our 680FL's off of ICT airport operating 1,500 lb. under gross and with an OAT around 50F. We almost did not make it but we got the aircraft to about 300 AGL and then came back around and landed safely. After that I told our cargo customer we could not operate the 680FL's for them any longer and we ran 2 500B on the route. One time taking off out of Colorado Springs on a hot summer day at gross weight in our 680W I made the comment to my dad if we lose an engine on this takeoff we better just hope we have some altitude below us for I don't think we can climb this aircraft on one engine today.
I visited with several of the Rockwell engineers (primarily Pete Peterson) and I was told Rockwell was very interested in not building the 680FL's and 680 turbo's and that is how the 690 series research was started and the 690 was born. Basically Rockwell reworked the wing and put the engines farther away from the fuselage and lengthened the propellers and put dash 5 Garrett 331 power on the 690 700+ SHP and then in 1978 Bob Hoover broke the World climb record to FL310 in the 690B model.
My opinion on all of the above, the 680's with the long fuselage are wonderful flying aircraft but are not the best on 1 engine and are under powered for their weight and wing loading.
My reason for writing the above Central Air has been to the school of hard knocks with the above and maybe the above info will help one or some of the TCFG folks from a bad problem or can help avert a bad problem or prevent an accident. The other basic problem with the IO-540 supercharged/turbo-charged and then putting a gear box on the front you will only gain another 75-80 HP and now you are pulling 45 inches of MP on takeoff and this will help cause cylinder cracking. Also with the direct drive IO-720 (Mr RPM engine) you can get a little more HP but still at 500 SPH with the 680W it did not fix the climb problem. NOTE-the 680 series with the small fuselage does not have the problems the 680 series with the long fuselage seem to have. I flew a 680E 600 hours in the 1970's (small fuselage) with 340 HP engines and that aircraft went straight up on one engine.
RESPECTFULLY SUBMITTED,
John Towner
Central Air
MKC Kansas City
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YOURTCFG(at)aol.com
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| Posted: Sun Jun 24, 2007 2:01 pm Post subject: 680FL & 680W Commanders |
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In a message dated 6/24/2007 1:19:11 PM Pacific Daylight Time, barry.collman(at)air-britain.co.uk writes:
| Quote: | | NOTE-the 680 series with the small fuselage does not have the problems the 680 series with the long fuselage seem to have. I flew a 680E 600 hours in the 1970's (small fuselage) with 340 HP engines and that aircraft went straight up on one engine. |
I could not have said it better myself!! That is why I fly one. Thanks John for a great bit of empirical data!! jb
See what's free at AOL.com.
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kamala(at)MSN.COM
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| Posted: Sun Jun 24, 2007 6:19 pm Post subject: 680FL & 680W Commanders |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> I sure like mine. mason 680Fp, mrrpm conversion 2001M
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WINGFLYER1(at)aol.com
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| Posted: Mon Jun 25, 2007 2:47 pm Post subject: 680FL & 680W Commanders |
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Excuse me for butting in but I have a 680 and it will out perform most medium twins out there . It has power to spare. Wingflyer 1(at)aol.com
See what's free at AOL.com.
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