Yak-List Digest Archive

Mon 08/15/05


Total Messages Posted: 16



Today's Message Index:
----------------------
 
     1. 04:08 AM - Re: Radial Rocket (Craig Payne)
     2. 04:23 AM - Re: Re: Radial Rocket (KJKimball@aol.com)
     3. 07:07 AM - Re: YAK-52 TD (Bill Walker)
     4. 07:22 AM - Re: Re: Radial Rocket (Fraser, Gus)
     5. 08:49 AM - Re: powered up CJ5's (N13472@aol.com)
     6. 08:49 AM - Re: Selma Buffonery (N13472@aol.com)
     7. 09:56 AM - Re: Re: Radial Rocket (KJKimball@aol.com)
     8. 09:59 AM - Re: YAK-52 TD (Roger Doc Kemp)
     9. 10:31 AM - Re: Re: Radial Rocket (Fraser, Gus)
    10. 11:52 AM - Cowl development (Craig Payne)
    11. 12:07 PM - Re: Cowl development (Roger Doc Kemp)
    12. 03:59 PM - Re: YAK-52 TD (ByronMFox@aol.com)
    13. 04:43 PM - Re: Re: Radial Rocket (Frank Haertlein)
    14. 05:59 PM - Re: Re: Selma Buffonery (Craig Payne)
    15. 07:32 PM - Re: Re: Re: Selma Buffonery (Roger Doc Kemp)
    16. 10:23 PM - Re: Selma Buffonery (fish@aviation-tech.com)
 
 
 


Message 1


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    Time: 04:08:10 AM PST US
    From: "Craig Payne" <cpayne@joimail.com>
    Subject: Re: Radial Rocket
    --> Yak-List message posted by: "Craig Payne" <cpayne@joimail.com> Speaking of the Radial Rocket, I saw it at OSH again this year. No retract version planned but being of the engineer's bent, I'm afraid I insulted the designer when I pointed out that it performs like the F-1 Rocket but requires almost another 100HP to do so. I think that drag through the engine is the biggest issue. Looking at the cowling exit area on the RR, I'm amazed at how small it is. Designer reports normal temps in cruise but I wonder about extended taxi. Craig Payne cpayne@joimail.com


    Message 2


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    Time: 04:23:17 AM PST US
    From: KJKimball@aol.com
    Subject: Re: Radial Rocket
    --> Yak-List message posted by: KJKimball@aol.com Craig, The nose bowl of the RR is similar to that which I designed for the Pitts Model 12. The shape of the bowl, the opening and the double reflex inner cuff really work well to provide excellent cooling flow. The outlet area at the lower firewall of the model 12 is small also at 7.25"x 19" wide. We have excellent cooling even during acro with the 12. The McCullocoupe is another design of ours with the same cowl and exit areas. It's 400hp M14PF runs very cool and verges on too cool. Oil temps have never exceeded 170f even when the engine was new and during acro. The head temps have never gone over 370f. Sincerely, Kevin Kimball, VP Engineering Jim Kimball Enterprises, Inc. PO Box 849, 5354 Cemetery Rd. Zellwood, FL 32798 407-889-3451 phone 407-889-7168 fax http://www.jimkimballenterprises.com/ http://www.pittsmodel12.com/


    Message 3


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    Time: 07:07:29 AM PST US
    From: "Bill Walker" <bwalker11@charter.net>
    Subject: Re: YAK-52 TD
    --> Yak-List message posted by: "Bill Walker" <bwalker11@charter.net> Hi gang, Guess I've lurked long enough, time for a response. Dennis is correct to a degree. The clark Y airfoil on these aircraft was not designed for speed. However, some mods to the plane have made it a little faster. The flush enclosed landing gear must help as there is considerably less drag to it. Enroute to Oshkosh I indicated 240 kmh at 6500 ft with a 65/65 pwr setting for the entire trip. I've flown regular Yaks and TWs for several years and at an equal power setting, temperature, and altitude, the TD is a little faster. The real benefit to the TD is not cruise speed, (my Viking is made for that) it is the extra fuel (68 gallons), over all balance, and excellent workmanship that Termikas does on the rebuilding of these planes. Anyone who saw this plane a Oshkosh will attest to the workmanship. As to the balance, Termikas has done their homework with the elimination of the nose gear and addition of fuel in the wings. The Cof G falls between 21% and 27% of mac and the plane can be flown from the rear seat solo. The nose heavyness is gone when solo in the front seat and the trim change when a passenger is in the back is not as noticeable. Solo, it flies and performs aerobatics more like the 50 than the 52. Sorry, enough advertising! For those who are interested in the gear collapse, a manufacturing defect was found in the left side diagonal strut that raises and lowers the gear. I must give praise at his point to Vytas and Algis at Termikas. In addition to the landing gear problem, I had some problems with shipping damage as well. Termikas has responded quickly, and gone to great lengths to resolve any problems that I have incurred, problems for which they may not have been responsible. One last thing, Termikas rebuilt the Russian M14 using the 400 hp blower kit. This is a huge benefit even with the V530 prop. Manifold pressure at take-off could be pushed up to around 1000 to 1100 and, naturally, cruise pressure could be maintained at a higher altitude. I can't say whether the added cost is justifiable. I can't justify having a BMW over a chevy, or even owning an airplane! But if I have to make a choice between the BMW and the TD, sorry Joyce, the BMW is outta here! "Wild Bill"


    Message 4


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    Time: 07:22:53 AM PST US
    From: "Fraser, Gus" <gus.fraser@gs.com>
    Subject: Re: Radial Rocket
    --> Yak-List message posted by: "Fraser, Gus" <gus.fraser@gs.com> Kevin, At Osh I noticed the cowls on both the 12 and the RR. Just looking at it I just got the feel that the top cylinders would get hotter than the lower ones. No evidence but I was wondering if you had any evidence of monitoring all cylinder temps with something like the EDM900 ? If the cooling is even I understand why Craig "speed demon, low mpg" Payne is interested. Craig can't wait till the day that you quote 6gph at 160kts :)))) Gus -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of KJKimball@aol.com Subject: Re: Yak-List: Re: Radial Rocket --> Yak-List message posted by: KJKimball@aol.com Craig, The nose bowl of the RR is similar to that which I designed for the Pitts Model 12. The shape of the bowl, the opening and the double reflex inner cuff really work well to provide excellent cooling flow. The outlet area at the lower firewall of the model 12 is small also at 7.25"x 19" wide. We have excellent cooling even during acro with the 12. The McCullocoupe is another design of ours with the same cowl and exit areas. It's 400hp M14PF runs very cool and verges on too cool. Oil temps have never exceeded 170f even when the engine was new and during acro. The head temps have never gone over 370f. Sincerely, Kevin Kimball, VP Engineering Jim Kimball Enterprises, Inc. PO Box 849, 5354 Cemetery Rd. Zellwood, FL 32798 407-889-3451 phone 407-889-7168 fax http://www.jimkimballenterprises.com/ http://www.pittsmodel12.com/


    Message 5


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    Time: 08:49:14 AM PST US
    From: N13472@aol.com
    Subject: Re: powered up CJ5's
    --> Yak-List message posted by: N13472@aol.com In a message dated 8/14/2005 3:48:08 P.M. Pacific Daylight Time, rvfltd@televar.com writes: One note, at this time there is only one powered up CJ5 / yak 18 in existence in the US that I know of. It belonged to Bob Kantner of CA. I am told that it is wearing a 220 or 260 hp Cont. radial and is a great performer. I am told it recently sold to a gentleman in NV. I was hoping to see it at ARS this year, but he did not show. Tom Elliott do you know the name of the new owner?? Hopefully we will be successful in recruiting him into our ranks and that the aircraft will be at ARS 06. Always Yakin, Doug Sapp It has a 220 Cont, Bob Thomson is the new owner based at 3L2 in Sandy Valley NV. Also has hyd toe brakes, Electric/hyd Ldg & Flaps. I am working on him to join RPA, he does not have? / use a computer so if any one has any questions? for him send them to me. I will hard copy to Bob. Tom & Nora Elliott CASCADE WARBIRDS CJ-6A NX63727 C-177B N13472 777 Quartz Ave Sandy Valley NV 89019 Home 702-723-1223 Fax 702-723-1243 Cell 702-595-2680 Tom Cell 702-808-1316 Nora


    Message 6


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    Time: 08:49:14 AM PST US
    From: N13472@aol.com
    Subject: Re: Selma Buffonery
    --> Yak-List message posted by: N13472@aol.com In a message dated 8/14/2005 5:20:53 A.M. Pacific Daylight Time, jsfox@adelphia.net writes: Yak-List message posted by: Stephen Fox <jsfox@adelphia.net> Definitely need a Hangar Queen award - CJ or Yak Steve "SOB" Fox Yak 52 N3043R http://homepage.mac.com/steve.fox/PhotoAlbum5.html YES, I need another trophy! Tom & Nora Elliott CASCADE WARBIRDS CJ-6A NX63727 777 Quartz Ave Sandy Valley NV 89019 Home 702-723-1223 Fax 702-723-1243 Cell 702-595-2680 Tom Cell 702-808-1316 Nora


    Message 7


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    Time: 09:56:46 AM PST US
    From: KJKimball@aol.com
    Subject: Re: Radial Rocket
    --> Yak-List message posted by: KJKimball@aol.com Gus, We have instrumented the engine in the past. With our first model 12, we were very careful to evaluate the cooling. We found a head temps that would approach red line with acro for the first few hours until the engine we broken in. After that, temps only approached red line of 464F when doing 8-10 hammerheads in a row at full power and full rpm. At that time, we had a smaller oil cooler installed than we now use and had more trouble with oil temps than head temps. Now with our current oil cooler, we have no oil temp problems. We often see cylinder #5 as the hottest as it is next to the sump. The top cylinders don't seem to run hotter than the lowers. Out firewall and exit are designed for downward flow. I think the opening in the front of the RR cowl is smaller than in the model 12. It uses the model 12 spinner. Heck, lots of M14 powered airplanes have the model 12 18" spinner on them now. We used the same cowl opening diameter as the Sukhoi so that the gills or iris from the Sukhoi could be used if desired. I think a yak 52 cowl has a larger diameter inlet opening than the Sukhoi and if this is correct, it may be such to allow for the area absorbed by the louvers. The Yak cowl typically has an inner cuff at the top only that is a single curve that ends abruptly into the cowl skin forward of the top cylinders. A sukhoi has a full 360 degree inner cuff but it too ends abruptly into the skin. The model 12, and I assume the RR, have a double curve inner cuff. I designed this inner cuff such that it creates attached flow along it to the cylinder heads much like a venturi. We do get a bit of expansive cooling effect with this slightly dropping the air temp before it hits the cylinders. The model 12 is fast too. Not as fast as the McCullocoupe or the RR but fast for a biplane of it's size. We see 170mph true cruise at 14.5-15 gal/hr. 1000ft msl wide open speed is 205mph. Vne is 239mph. The 12 is faster than all 3 models of sukhoi. Some of this speed has to be from reduction in cooling drag both inlet and outlet as compared to that of the sukhoi and yak. Curtis felt airplanes we cooling exits under the belly gain a bit of a buoyant effect that lightened the load of the airplane somewhat. I'm not sure about that but Curtis wasn't wrong very often on such matters. Sincerely, Kevin Kimball, VP Engineering Jim Kimball Enterprises, Inc. PO Box 849, 5354 Cemetery Rd. Zellwood, FL 32798 407-889-3451 phone 407-889-7168 fax http://www.jimkimballenterprises.com/ http://www.pittsmodel12.com/


    Message 8


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    Time: 09:59:06 AM PST US
    From: "Roger Doc Kemp" <viperdoc@mindspring.com>
    Subject: Re: YAK-52 TD
    --> Yak-List message posted by: "Roger Doc Kemp" <viperdoc@mindspring.com> Dennis, You missed the sarcassim in the 3) SUPPOSEDLY flies faster. That was where I was going with that comment. Managed to catch the crap that Scottie had (not very likely from him, have been seeing it all week before). This is the first time in years that I actually had to take off. So, I'm home today feeling like shit. Talk to you later. Doc > [Original Message] > From: A. Dennis Savarese <dsavarese@elmore.rr.com> > To: <yak-list@matronics.com> > Date: 8/14/2005 10:14:40 PM > Subject: Re: Yak-List: YAK-52 TD > > --> Yak-List message posted by: "A. Dennis Savarese" <dsavarese@elmore.rr.com> > > According to Tim Williams (52TW) who flew along side of Bill Walker's TD at > OSH, they are definitely NOT any faster. It's the Clark Y airfoil. Can't > make it go much faster than it already is. > Dennis > > ----- Original Message ----- > From: "Roger Doc Kemp" <viperdoc@mindspring.com> > To: "yak-list" <yak-list@matronics.com> > Subject: Yak-List: YAK-52 TD > > > > --> Yak-List message posted by: "Roger Doc Kemp" <viperdoc@mindspring.com> > > > > Frank, > > I had thought about a TD at one time same as I thought about a L-39. It > > all came down to cost benefit ratios. The benefit of the TD was: 1) It > > looks cool 2) It cost less than a TW 3)It supposedly flies faster than the > > 52. The L-39 also looks cool, does fly a hell of a lot faster, and cost > > about the same as a TW. The cost in this deal is why I have not purchased > > either of the 3, TD, TW, or 39. > > For all the above cost, I can operate my "Nose Dragging 52" for a > > looooonnnnnggggg time. The idea here is to have fun economically. And we > > all know....Economics are relative. Just depends on how much you want to > > pay for the fun you have. For me, I'm keeping the "nose dragging 52" and > > having economical fun! After all, the grass is just as green in this > > pasture as it is on the otherside of the fence. > > Doc > > > > > > Roger "Doc" Kemp > > viperdoc@mindspring.com > > If it don't sound Round...Why listen? > > > > > > > >


    Message 9


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    Time: 10:31:31 AM PST US
    From: "Fraser, Gus" <gus.fraser@gs.com>
    Subject: Re: Radial Rocket
    --> Yak-List message posted by: "Fraser, Gus" <gus.fraser@gs.com> Jim thanks for that. My Sp-91 has a Sukhoi set up. I think that it might be interesting to see a modification for 52s and CJs for a real sleek looking nose. Craig did make some changes to his stock CJ cowl that he reported made a difference in drag go for it Craig you know you want to. Then it would look even more like an FW :))) Gus -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of KJKimball@aol.com Subject: Re: Yak-List: Re: Radial Rocket --> Yak-List message posted by: KJKimball@aol.com Gus, We have instrumented the engine in the past. With our first model 12, we were very careful to evaluate the cooling. We found a head temps that would approach red line with acro for the first few hours until the engine we broken in. After that, temps only approached red line of 464F when doing 8-10 hammerheads in a row at full power and full rpm. At that time, we had a smaller oil cooler installed than we now use and had more trouble with oil temps than head temps. Now with our current oil cooler, we have no oil temp problems. We often see cylinder #5 as the hottest as it is next to the sump. The top cylinders don't seem to run hotter than the lowers. Out firewall and exit are designed for downward flow. I think the opening in the front of the RR cowl is smaller than in the model 12. It uses the model 12 spinner. Heck, lots of M14 powered airplanes have the model 12 18" spinner on them now. We used the same cowl opening diameter as the Sukhoi so that the gills or iris from the Sukhoi could be used if desired. I think a yak 52 cowl has a larger diameter inlet opening than the Sukhoi and if this is correct, it may be such to allow for the area absorbed by the louvers. The Yak cowl typically has an inner cuff at the top only that is a single curve that ends abruptly into the cowl skin forward of the top cylinders. A sukhoi has a full 360 degree inner cuff but it too ends abruptly into the skin. The model 12, and I assume the RR, have a double curve inner cuff. I designed this inner cuff such that it creates attached flow along it to the cylinder heads much like a venturi. We do get a bit of expansive cooling effect with this slightly dropping the air temp before it hits the cylinders. The model 12 is fast too. Not as fast as the McCullocoupe or the RR but fast for a biplane of it's size. We see 170mph true cruise at 14.5-15 gal/hr. 1000ft msl wide open speed is 205mph. Vne is 239mph. The 12 is faster than all 3 models of sukhoi. Some of this speed has to be from reduction in cooling drag both inlet and outlet as compared to that of the sukhoi and yak. Curtis felt airplanes we cooling exits under the belly gain a bit of a buoyant effect that lightened the load of the airplane somewhat. I'm not sure about that but Curtis wasn't wrong very often on such matters. Sincerely, Kevin Kimball, VP Engineering Jim Kimball Enterprises, Inc. PO Box 849, 5354 Cemetery Rd. Zellwood, FL 32798 407-889-3451 phone 407-889-7168 fax http://www.jimkimballenterprises.com/ http://www.pittsmodel12.com/


    Message 10


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    Time: 11:52:05 AM PST US
    From: "Craig Payne" <cpayne@joimail.com>
    Subject: Cowl development
    --> Yak-List message posted by: "Craig Payne" <cpayne@joimail.com> Developing an improved cowl for a Yak is like putting lipstick on a pig. Cooling improvement yes, speed...well you still have that fat Clark wing with bridge rivets and buzzards feet hanging down. Now the CJ has some possibilities as the real dirty place IS the cowl and nosegear, everything else is clean. My cowl mods are only Stage 1, with 2 more versions in the works. I'm planning a tuft testing flight soon but now the smoke in the cockpit issue can also benefit from tuft testing to visualize the flow under different AOA regimes. BTW, NACA worked all the cowling drag problems out in the late 30's and 40's. Just read the literature. Craig Payne cpayne@joimail.com


    Message 11


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    Time: 12:07:26 PM PST US
    From: "Roger Doc Kemp" <viperdoc@mindspring.com>
    Subject: Cowl development
    --> Yak-List message posted by: "Roger Doc Kemp" <viperdoc@mindspring.com> > --> Yak-List message posted by: "Craig Payne" <cpayne@joimail.com> > > Developing an improved cowl for a Yak is like putting lipstick on a pig. Cooling improvement yes, speed...well you still have that fat Clark wing with bridge rivets and buzzards feet hanging down. Ah but that pig will loop and roll inside that slick CJ. Doc


    Message 12


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    Time: 03:59:39 PM PST US
    From: ByronMFox@aol.com
    Subject: Re: YAK-52 TD
    --> Yak-List message posted by: ByronMFox@aol.com In a message dated 8/15/05 7:08:48 AM, bwalker11@charter.net writes: > I can't say whether the added cost is justifiable. I can't justify having a > BMW over a chevy, or even owning an airplane! But if I have to make a choice > between the BMW and the TD, sorry Joyce, the BMW is outta here! > > Oh, Diogenes! Eureka! The honest man has been found. ...Blitz


    Message 13


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    Time: 04:43:08 PM PST US
    From: "Frank Haertlein" <yak52driver@earthlink.net>
    Subject: Re: Radial Rocket
    --> Yak-List message posted by: "Frank Haertlein" <yak52driver@earthlink.net> Jim Visited your website http://www.jimkimballenterprises.com/ I really like the music by-the-way. That McCullocoupe looks like a plane I wouldn't mind building! Looks to be a plane made for the sheer thrill and fun of flying...... And I bet at a kit cost less than a TD conversion of the 52. Send me the info on the kit! A friend keeps telling me to not bother with 52 upgrades. Keeps referring to something about silk out of a pigs ear....or something like that. Thanks Frank -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of KJKimball@aol.com Subject: Re: Yak-List: Re: Radial Rocket --> Yak-List message posted by: KJKimball@aol.com Gus, We have instrumented the engine in the past. With our first model 12, we were very careful to evaluate the cooling. We found a head temps that would approach red line with acro for the first few hours until the engine we broken in. After that, temps only approached red line of 464F when doing 8-10 hammerheads in a row at full power and full rpm. At that time, we had a smaller oil cooler installed than we now use and had more trouble with oil temps than head temps. Now with our current oil cooler, we have no oil temp problems. We often see cylinder #5 as the hottest as it is next to the sump. The top cylinders don't seem to run hotter than the lowers. Out firewall and exit are designed for downward flow. I think the opening in the front of the RR cowl is smaller than in the model 12. It uses the model 12 spinner. Heck, lots of M14 powered airplanes have the model 12 18" spinner on them now. We used the same cowl opening diameter as the Sukhoi so that the gills or iris from the Sukhoi could be used if desired. I think a yak 52 cowl has a larger diameter inlet opening than the Sukhoi and if this is correct, it may be such to allow for the area absorbed by the louvers. The Yak cowl typically has an inner cuff at the top only that is a single curve that ends abruptly into the cowl skin forward of the top cylinders. A sukhoi has a full 360 degree inner cuff but it too ends abruptly into the skin. The model 12, and I assume the RR, have a double curve inner cuff. I designed this inner cuff such that it creates attached flow along it to the cylinder heads much like a venturi. We do get a bit of expansive cooling effect with this slightly dropping the air temp before it hits the cylinders. The model 12 is fast too. Not as fast as the McCullocoupe or the RR but fast for a biplane of it's size. We see 170mph true cruise at 14.5-15 gal/hr. 1000ft msl wide open speed is 205mph. Vne is 239mph. The 12 is faster than all 3 models of sukhoi. Some of this speed has to be from reduction in cooling drag both inlet and outlet as compared to that of the sukhoi and yak. Curtis felt airplanes we cooling exits under the belly gain a bit of a buoyant effect that lightened the load of the airplane somewhat. I'm not sure about that but Curtis wasn't wrong very often on such matters. Sincerely, Kevin Kimball, VP Engineering Jim Kimball Enterprises, Inc. PO Box 849, 5354 Cemetery Rd. Zellwood, FL 32798 407-889-3451 phone 407-889-7168 fax http://www.jimkimballenterprises.com/ http://www.pittsmodel12.com/


    Message 14


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    Time: 05:59:38 PM PST US
    From: "Craig Payne" <cpayne@joimail.com>
    Subject: Re: Re: Selma Buffonery
    --> Yak-List message posted by: "Craig Payne" <cpayne@joimail.com> 2 more awards came to mind: Fastest Yak ...no that's an oxymoron Slowest Yak...yes but it's only a 4 day event Craig Payne cpayne@joimail.com EarthLink Revolves Around You.


    Message 15


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    Time: 07:32:09 PM PST US
    From: "Roger Doc Kemp" <viperdoc@mindspring.com>
    Subject: Re: Re: Selma Buffonery
    --> Yak-List message posted by: "Roger Doc Kemp" <viperdoc@mindspring.com> Or Best turning CJ! Doc > [Original Message] > From: Craig Payne <cpayne@joimail.com> > To: yak-list <yak-list@matronics.com> > Date: 8/15/2005 7:59:00 PM > Subject: Yak-List: Re: Re: Selma Buffonery > > --> Yak-List message posted by: "Craig Payne" <cpayne@joimail.com> > > 2 more awards came to mind: > > Fastest Yak ...no that's an oxymoron > Slowest Yak...yes but it's only a 4 day event > > > Craig Payne > cpayne@joimail.com > EarthLink Revolves Around You. > >


    Message 16


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    Time: 10:23:48 PM PST US
    From: fish@aviation-tech.com
    Subject: Re: Selma Buffonery
    --> Yak-List message posted by: fish@aviation-tech.com I think that award goes to me. My Yak has not flown in over a year and the future is not looking good. Only needs $500.00 in repairs! >--> Yak-List message posted by: N13472@aol.com > > >In a message dated 8/14/2005 5:20:53 A.M. Pacific Daylight Time, >jsfox@adelphia.net writes: > >Yak-List message posted by: Stephen Fox <jsfox@adelphia.net> > >Definitely need a Hangar Queen award - CJ or Yak > >Steve "SOB" Fox >Yak 52 >N3043R >http://homepage.mac.com/steve.fox/PhotoAlbum5.html > > >YES, I need another trophy! > >Tom & Nora Elliott >CASCADE WARBIRDS >CJ-6A NX63727 >777 Quartz Ave >Sandy Valley NV 89019 >Home 702-723-1223 >Fax 702-723-1243 >Cell 702-595-2680 Tom >Cell 702-808-1316 Nora > >




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