---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sun 10/18/09: 14 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:04 AM - Re: Throttle (pilko2) 2. 04:43 AM - Re: Throttle (Didier Blouzard) 3. 05:00 AM - Re: Throttle (Vic) 4. 05:24 AM - Re: Re: Throttle (Didier Blouzard) 5. 05:27 AM - Re: Fuel gauges (Vic) 6. 05:47 AM - Re: Re: Fuel gauges (Didier Blouzard) 7. 09:55 AM - Re: Throttle (pilko2) 8. 12:24 PM - Re: Throttle (Didier Blouzard) 9. 01:26 PM - Re: Throttle (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E) 10. 02:16 PM - Re: Throttle (Didier Blouzard) 11. 02:26 PM - Re: Throttle (Jan Mevis) 12. 02:37 PM - (delfin) 13. 03:16 PM - Re: Throttle (Keith Pickford) 14. 07:46 PM - CO (bob) ________________________________ Message 1 _____________________________________ Time: 04:04:58 AM PST US From: "pilko2" Subject: RE: Yak-List: Throttle That's likely carburettor icing restricting the butterfly/linkage movement. I've had the same and I now select carb heat on finals if there is any moisture in the air. Fly safe kp -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of tigeryak18t Sent: 17 October 2009 22:17 Subject: Yak-List: Throttle --> Now the other subject, I told you in the precedent post that I had 2 subjects....you should not be sleeping. In France it is 11h30pm but you are just waking up, so good day to all. Now I was checking my fuel gauges up there in the sky and lining up I came to the final. On short, I reduced all, and I had a surprise, the throttle did not want to go under 50%. So I continued and landed at 50%...so now I can tell you that it is possible to land on a grass strip of 700m at 50% full fine pitch and stop at the end... I went at 50% to make some fuel, and stopped the engine. Then, I started again to taxi to my hangar and made some engine runup. An dthen surprise, it worked fine. I do not know what happened, but it is a little frightenning. Not being able to reduce.. Is this something that already happenned to someone?? Anyone have an idea of what happenned.??? O now I am finished for the weekend, so good weekend to all and fly safe Didier HA-JAC 18T -------- Didier Tiger YAK18T Member of Commemorative Air Force French Wing Read this topic online here: http://forums.matronics.com/viewtopic.php?p=268350#268350 ________________________________ Message 2 _____________________________________ Time: 04:43:20 AM PST US From: Didier Blouzard Subject: Re: Yak-List: Throttle That's an interesting one. I thought that the M14P was very little subject to carburator icing. OK yes very interesting. Even with minus 15 I never had carb icing on that motor. But that sound like it as this effect disappear after taxiing. Has anyone else experienced such thing?? Thanks. Now I will set the carb heat on at each landing. Didier 2009/10/18 pilko2 > > That's likely carburettor icing restricting the butterfly/linkage movement. > > I've had the same and I now select carb heat on finals if there is any > moisture in the air. > > Fly safe > kp > > -----Original Message----- > From: owner-yak-list-server@matronics.com > [mailto:owner-yak-list-server@matronics.com] On Behalf Of tigeryak18t > Sent: 17 October 2009 22:17 > To: yak-list@matronics.com > Subject: Yak-List: Throttle > > --> > > Now the other subject, > > I told you in the precedent post that I had 2 subjects....you should not be > sleeping. In France it is 11h30pm but you are just waking up, so good day > to > all. > > Now I was checking my fuel gauges up there in the sky and lining up I came > to the final. On short, I reduced all, and I had a surprise, the throttle > did not want to go under 50%. > So I continued and landed at 50%...so now I can tell you that it is > possible > to land on a grass strip of 700m at 50% full fine pitch and stop at the > end... > I went at 50% to make some fuel, and stopped the engine. > Then, I started again to taxi to my hangar and made some engine runup. > An dthen surprise, it worked fine. > I do not know what happened, but it is a little frightenning. Not being > able > to reduce.. > Is this something that already happenned to someone?? > Anyone have an idea of what happenned.??? > > O now I am finished for the weekend, so good weekend to all and fly safe > > Didier HA-JAC 18T > > -------- > Didier Tiger YAK18T > Member of Commemorative Air Force > French Wing > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=268350#268350 > > -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 ________________________________ Message 3 _____________________________________ Time: 05:00:05 AM PST US Subject: Yak-List: Re: Throttle From: "Vic" Hello Didier, I would check the throttle linkage too. Make sure that the copper tube is really fixed and no movement is lost between the levers in the cockpit and the carb. Ice in the carb should prevent any movement of the throttle, did you notice that this was the case ? Good luck with trouble shooting. Vic Read this topic online here: http://forums.matronics.com/viewtopic.php?p=268388#268388 ________________________________ Message 4 _____________________________________ Time: 05:24:44 AM PST US From: Didier Blouzard Subject: Re: Yak-List: Re: Throttle OK good sugestion, I'll have a look to that also. Thanks and good day regards Didier 2009/10/18 Vic > > Hello Didier, > I would check the throttle linkage too. Make sure that the copper tube is > really fixed and no movement is lost between the levers in the cockpit and > the carb. Ice in the carb should prevent any movement of the throttle, did > you notice that this was the case ? > Good luck with trouble shooting. > Vic > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=268388#268388 > > -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 ________________________________ Message 5 _____________________________________ Time: 05:27:00 AM PST US Subject: Yak-List: Re: Fuel gauges From: "Vic" Hello Didier, we had the same problem this year with our 18 T. The reason for wrong fuel readings is the fact that the float is no longer floating as the plastic foam has shrinked a lot and the float does no longer produce enough lift. Did you use auto gasoline a lot in recent years as we do ? I wonder if somebody else had misreadings of the fuel state with other Yak types as well and did he check the floats if there is the same foam type installed. There are sheet metal floats too on other Russian aircraft which will not shrink with modern fuel but could develop a leak and will drown in consequence.When you take out the fuel sender unit and move the float lever by hand you should get perfect readings on the gauge for all positions. You could add a very light spring to the float to assist as we did, but basically Id like to know if someone could provide a metal float. By the way, we had in the past uneven readings betweeen the left and right wing tank in flight, so we suspect having been fooled by sinking floats for some time. Kind regards Vic Read this topic online here: http://forums.matronics.com/viewtopic.php?p=268392#268392 ________________________________ Message 6 _____________________________________ Time: 05:47:43 AM PST US From: Didier Blouzard Subject: Re: Yak-List: Re: Fuel gauges OK that's very interesting Vic, I have this problem since not a very long time but the annoying thing is that when in flight since about half an hour an hour it comes back to normal. Probably the floaters sinks and with vibrations it come back floating.... I will ask my operator in Hungary and also Termikas in Lithuania and I'll let you know what they say. Then I will also ask friend builders. they are really very smart and see what they think about that floaters thing. If it can be repaired or replaced. I have heard about these metal floats. I'll tell you also if Termikas has them. Thanks a lot for your answers. regards Didier 2009/10/18 Vic > > Hello Didier, > we had the same problem this year with our 18 T. The reason for wrong fue l > readings is the fact that the float is no longer floating as the plastic > foam has shrinked a lot and the float does no longer produce enough lift. > Did you use auto gasoline a lot in recent years as we do ? I wonder if > somebody else had misreadings of the fuel state with other Yak types as w ell > and did he check the floats if there is the same foam type installed. The re > are sheet metal floats too on other Russian aircraft which will not shrin k > with modern fuel but could develop a leak and will drown in consequence.W hen > you take out the fuel sender unit and move the float lever by hand you > should get perfect readings on the gauge for all positions. > You could add a very light spring to the float to assist as we did, but > basically I=B4d like to know if someone could provide a metal float. > By the way, we had in the past uneven readings betweeen the left and rig ht > wing tank in flight, so we suspect having been fooled by sinking floats f or > some time. > Kind regards > Vic > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=268392#268392 > > =========== =========== =========== =========== > > -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 ________________________________ Message 7 _____________________________________ Time: 09:55:52 AM PST US From: "pilko2" Subject: RE: Yak-List: Throttle Carburettor icing is not necessarily relevant to ambient temperature. Critical atmospheric water will not be present at -15C. Carb icing is quite common in the warm moist UK conditions, especially at low manifold settings. BEWARE ! _____ From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Didier Blouzard Sent: 18 October 2009 12:41 Subject: Re: Yak-List: Throttle That's an interesting one. I thought that the M14P was very little subject to carburator icing. OK yes very interesting. Even with minus 15 I never had carb icing on that motor. But that sound like it as this effect disappear after taxiing. Has anyone else experienced such thing?? Thanks. Now I will set the carb heat on at each landing. Didier 2009/10/18 pilko2 That's likely carburettor icing restricting the butterfly/linkage movement. I've had the same and I now select carb heat on finals if there is any moisture in the air. Fly safe kp -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of tigeryak18t Sent: 17 October 2009 22:17 Subject: Yak-List: Throttle --> Now the other subject, I told you in the precedent post that I had 2 subjects....you should not be sleeping. In France it is 11h30pm but you are just waking up, so good day to all. Now I was checking my fuel gauges up there in the sky and lining up I came to the final. On short, I reduced all, and I had a surprise, the throttle did not want to go under 50%. So I continued and landed at 50%...so now I can tell you that it is possible to land on a grass strip of 700m at 50% full fine pitch and stop at the end... I went at 50% to make some fuel, and stopped the engine. Then, I started again to taxi to my hangar and made some engine runup. An dthen surprise, it worked fine. I do not know what happened, but it is a little frightenning. Not being able to reduce.. Is this something that already happenned to someone?? Anyone have an idea of what happenned.??? O now I am finished for the weekend, so good weekend to all and fly safe Didier HA-JAC 18T -------- Didier Tiger YAK18T Member of Commemorative Air Force French Wing Read this topic online here: http://forums.matronics.com/viewtopic.php?p=268350#268350 ========== rget="_blank">http://www.matronics.com/Navigator?Yak-List ========== http://forums.matronics.com ========== le, List Admin. ="_blank">http://www.matronics.com/contribution ========== -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 ________________________________ Message 8 _____________________________________ Time: 12:24:21 PM PST US From: Didier Blouzard Subject: Re: Yak-List: Throttle OK Ok I was not aware that the M14P was particularly sensitive to carb icing. I will put full warm now on low pa.. But I will also check the tube....for sure. Thanks Kind rgards 2009/10/18 pilko2 > Carburettor icing is not necessarily relevant to ambient temperature. > Critical atmospheric water will not be present at -15C. > > Carb icing is quite common in the warm moist UK conditions, especially at > low manifold settings. > > BEWARE ! > > ------------------------------ > *From:* owner-yak-list-server@matronics.com [mailto: > owner-yak-list-server@matronics.com] *On Behalf Of *Didier Blouzard > *Sent:* 18 October 2009 12:41 > *To:* yak-list@matronics.com > *Subject:* Re: Yak-List: Throttle > > That's an interesting one. I thought that the M14P was very little subject > to carburator icing. OK yes very interesting. Even with minus 15 I never had > carb icing on that motor. But that sound like it as this effect disappear > after taxiing. > Has anyone else experienced such thing?? > Thanks. > Now I will set the carb heat on at each landing. > > Didier > > > 2009/10/18 pilko2 > >> >> That's likely carburettor icing restricting the butterfly/linkage >> movement. >> >> I've had the same and I now select carb heat on finals if there is any >> moisture in the air. >> >> Fly safe >> kp >> >> -----Original Message----- >> From: owner-yak-list-server@matronics.com >> [mailto:owner-yak-list-server@matronics.com] On Behalf Of tigeryak18t >> Sent: 17 October 2009 22:17 >> To: yak-list@matronics.com >> Subject: Yak-List: Throttle >> >> --> >> >> Now the other subject, >> >> I told you in the precedent post that I had 2 subjects....you should not >> be >> sleeping. In France it is 11h30pm but you are just waking up, so good day >> to >> all. >> >> Now I was checking my fuel gauges up there in the sky and lining up I came >> to the final. On short, I reduced all, and I had a surprise, the throttle >> did not want to go under 50%. >> So I continued and landed at 50%...so now I can tell you that it is >> possible >> to land on a grass strip of 700m at 50% full fine pitch and stop at the >> end... >> I went at 50% to make some fuel, and stopped the engine. >> Then, I started again to taxi to my hangar and made some engine runup. >> An dthen surprise, it worked fine. >> I do not know what happened, but it is a little frightenning. Not being >> able >> to reduce.. >> Is this something that already happenned to someone?? >> Anyone have an idea of what happenned.??? >> >> O now I am finished for the weekend, so good weekend to all and fly safe >> >> Didier HA-JAC 18T >> >> -------- >> Didier Tiger YAK18T >> Member of Commemorative Air Force >> French Wing >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=268350#268350 >> >> >> >> >> >> >> >> >> >> >> >> ========== >> rget="_blank">http://www.matronics.com/Navigator?Yak-List >> ========== >> http://forums.matronics.com >> ========== >> le, List Admin. >> ="_blank">http://www.matronics.com/contribution >> ========== >> >> >> >> > > > -- > Didier BLOUZARD > didier.blouzard@gmail.com > 0624243672 > > * > > href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List > href="http://forums.matronics.com">http://forums.matronics.com > href="http://www.matronics.com/contribution">http://www.matronics.com/c* > > * > > * > > -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 ________________________________ Message 9 _____________________________________ Time: 01:26:54 PM PST US Subject: RE: Yak-List: Throttle From: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E" Depends who you talk to Didier. I've owned a YAK-50 for over 9 years in North Carolina and have not once experienced carb ice. Not that I am aware of anyway. On the other hand, many people on this list swear to the fact that it has happened to them more than once. I think we are ALL correct. I know it hasn't happened to me, but I believe it has happened to others. The carb we use in the M-14 is a pressure carb. But pressure carbs, even though very close to being defined as "single point fuel injection" per se, still do have a Venturi. Thus it is entirely feasible that they could develop ice. Just as a matter of curiosity, does your airplane have a carb inlet temp gage? My YAK does. It is marked to basically show the "danger range" where ice can happen. Again, on my particular airplane, there is no "carb heat" .... there is instead an intake air flap that can be closed, thus forcing the carb to draw in air from the back of the engine, which would be much warmer. But it does not actually take hot air off of a heat muff, such as the kind that is used for cabin heating. The Yak-50 does not have any cabin heat. Which... is not really a good thing. It strikes me that possibly carb icing has a ton of factors involved that make it hard to predict, and make and model of aircraft might even be a factor. I do not know. Still waiting for my own very first carb ice experience, but until it happens I don't think I will be opening and closing the carb ram air inlet flap on every landing. I suspect your design is totally different than my own. Mark Bitterlich ________________________________ From: owner-yak-list-server@matronics.com on behalf of Didier Blouzard Sent: Sun 10/18/2009 3:21 PM Subject: Re: Yak-List: Throttle OK Ok I was not aware that the M14P was particularly sensitive to carb icing. I will put full warm now on low pa.. But I will also check the tube....for sure. Thanks Kind rgards 2009/10/18 pilko2 Carburettor icing is not necessarily relevant to ambient temperature. Critical atmospheric water will not be present at -15C. Carb icing is quite common in the warm moist UK conditions, especially at low manifold settings. BEWARE ! ________________________________ From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Didier Blouzard Sent: 18 October 2009 12:41 To: yak-list@matronics.com Subject: Re: Yak-List: Throttle That's an interesting one. I thought that the M14P was very little subject to carburator icing. OK yes very interesting. Even with minus 15 I never had carb icing on that motor. But that sound like it as this effect disappear after taxiing. Has anyone else experienced such thing?? Thanks. Now I will set the carb heat on at each landing. Didier 2009/10/18 pilko2 That's likely carburettor icing restricting the butterfly/linkage movement. I've had the same and I now select carb heat on finals if there is any moisture in the air. Fly safe kp -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of tigeryak18t Sent: 17 October 2009 22:17 To: yak-list@matronics.com Subject: Yak-List: Throttle --> Now the other subject, I told you in the precedent post that I had 2 subjects....you should not be sleeping. In France it is 11h30pm but you are just waking up, so good day to all. Now I was checking my fuel gauges up there in the sky and lining up I came to the final. On short, I reduced all, and I had a surprise, the throttle did not want to go under 50%. So I continued and landed at 50%...so now I can tell you that it is possible to land on a grass strip of 700m at 50% full fine pitch and stop at the end... I went at 50% to make some fuel, and stopped the engine. Then, I started again to taxi to my hangar and made some engine runup. An dthen surprise, it worked fine. I do not know what happened, but it is a little frightenning. Not being able to reduce.. Is this something that already happenned to someone?? Anyone have an idea of what happenned.??? O now I am finished for the weekend, so good weekend to all and fly safe Didier HA-JAC 18T -------- Didier Tiger YAK18T Member of Commemorative Air Force French Wing Read this topic online here: http://forums.matronics.com/viewtopic.php?p=268350#268350 ========== rget="_blank">http://www.matronics.com/Navigator?Yak-List ========== http://forums.matronics.com ========== le, List Admin. ="_blank">http://www.matronics.com/contribution ========== -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List href="http://forums.matronics.com ">http://forums.matronics.com href="http://www.matronics.com/contribution">http://www.matronics.com/c et="_blank">http://www.matronics.com/Navigator?Yak-List a>http://forums.matronics.com _blank">http://www.matronics.com/contribution -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 ________________________________ Message 10 ____________________________________ Time: 02:16:29 PM PST US From: Didier Blouzard Subject: Re: Yak-List: Throttle Mark, I must say that the thing that happened seems more mechanical than ice. But I will examine all possibilities. The only thing I know is that I did not dreamed the problem. I was with a friend owner of a 52. He is a comercial pilot. And both of us could see that the motor did not want to go under 50% even if I pushed hard on the throtle lever. We even tried to check the pitch (going to coarse and back to fine). After turning off the motor and refueling. At the next start everything came back to normal. But I did not tried the carb heat (was off) and I did not looked closely to the throtle lever. Was it completely down or was it blocked I am not sure. But it could be that it is a problem of the cable in the copper tube....don't know....I moved the throtle after turning off the motor and it looks fine... . I will check all this tomorrow and hoppefully come back with something. When something like this happen I like to find both cause and solution...for the moment I just had the resukt...that's bad!!! thanks very much Kind regards Didier 2009/10/18 Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E < mark.bitterlich@navy.mil> > MALS-14 64E" > > Depends who you talk to Didier. I've owned a YAK-50 for over 9 years in > North Carolina and have not once experienced carb ice. Not that I am aware > of anyway. > > On the other hand, many people on this list swear to the fact that it has > happened to them more than once. > > I think we are ALL correct. I know it hasn't happened to me, but I believe > it has happened to others. > > The carb we use in the M-14 is a pressure carb. But pressure carbs, even > though very close to being defined as "single point fuel injection" per se, > still do have a Venturi. Thus it is entirely feasible that they could > develop ice. > > Just as a matter of curiosity, does your airplane have a carb inlet temp > gage? My YAK does. It is marked to basically show the "danger range" where > ice can happen. Again, on my particular airplane, there is no "carb heat" > .... there is instead an intake air flap that can be closed, thus forcing > the carb to draw in air from the back of the engine, which would be much > warmer. But it does not actually take hot air off of a heat muff, such as > the kind that is used for cabin heating. The Yak-50 does not have any cabin > heat. Which... is not really a good thing. > > It strikes me that possibly carb icing has a ton of factors involved that > make it hard to predict, and make and model of aircraft might even be a > factor. I do not know. > > Still waiting for my own very first carb ice experience, but until it > happens I don't think I will be opening and closing the carb ram air inlet > flap on every landing. I suspect your design is totally different than my > own. > > Mark Bitterlich > > ________________________________ > > From: owner-yak-list-server@matronics.com on behalf of Didier Blouzard > Sent: Sun 10/18/2009 3:21 PM > To: yak-list@matronics.com > Subject: Re: Yak-List: Throttle > > > OK Ok I was not aware that the M14P was particularly sensitive to carb > icing. I will put full warm now on low pa.. > But I will also check the tube....for sure. > > Thanks > > Kind rgards > > > 2009/10/18 pilko2 > > > Carburettor icing is not necessarily relevant to ambient > temperature. Critical atmospheric water will not be present at -15C. > > Carb icing is quite common in the warm moist UK conditions, > especially at low manifold settings. > > BEWARE ! > > ________________________________ > > From: owner-yak-list-server@matronics.com [mailto: > owner-yak-list-server@matronics.com] On Behalf Of Didier Blouzard > Sent: 18 October 2009 12:41 > > To: yak-list@matronics.com > > Subject: Re: Yak-List: Throttle > > > That's an interesting one. I thought that the M14P was very little > subject to carburator icing. OK yes very interesting. Even with minus 15 I > never had carb icing on that motor. But that sound like it as this effect > disappear after taxiing. > Has anyone else experienced such thing?? > Thanks. > Now I will set the carb heat on at each landing. > > Didier > > > 2009/10/18 pilko2 > > > pilko2@btinternet.com> > > That's likely carburettor icing restricting the > butterfly/linkage movement. > > I've had the same and I now select carb heat on finals if > there is any > moisture in the air. > > Fly safe > kp > > -----Original Message----- > From: owner-yak-list-server@matronics.com > [mailto:owner-yak-list-server@matronics.com] On Behalf Of > tigeryak18t > Sent: 17 October 2009 22:17 > To: yak-list@matronics.com > Subject: Yak-List: Throttle > > --> > > Now the other subject, > > I told you in the precedent post that I had 2 > subjects....you should not be > sleeping. In France it is 11h30pm but you are just waking > up, so good day to > all. > > Now I was checking my fuel gauges up there in the sky and > lining up I came > to the final. On short, I reduced all, and I had a surprise, > the throttle > did not want to go under 50%. > So I continued and landed at 50%...so now I can tell you > that it is possible > to land on a grass strip of 700m at 50% full fine pitch and > stop at the > end... > I went at 50% to make some fuel, and stopped the engine. > Then, I started again to taxi to my hangar and made some > engine runup. > An dthen surprise, it worked fine. > I do not know what happened, but it is a little > frightenning. Not being able > to reduce.. > Is this something that already happenned to someone?? > Anyone have an idea of what happenned.??? > > O now I am finished for the weekend, so good weekend to all > and fly safe > > Didier HA-JAC 18T > > -------- > Didier Tiger YAK18T > Member of Commemorative Air Force > French Wing > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=268350#268350 > > > ========== > rget="_blank">http://www.matronics.com/Navigator?Yak-List > ========== > http://forums.matronics.com > ========== > le, List Admin. > ="_blank">http://www.matronics.com/contribution > ========== > > > -- > Didier BLOUZARD > didier.blouzard@gmail.com > 0624243672 > > > href="http://www.matronics.com/Navigator?Yak-List"> > http://www.matronics.com/Navigator?Yak-List > href="http://forums.matronics.com > ">http://forums.matronics.com > href="http://www.matronics.com/contribution"> > http://www.matronics.com/c > > > et="_blank">http://www.matronics.com/Navigator?Yak-List > a>http://forums.matronics.com > _blank">http://www.matronics.com/contribution > > > -- > Didier BLOUZARD > didier.blouzard@gmail.com > 0624243672 > > -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 ________________________________ Message 11 ____________________________________ Time: 02:26:21 PM PST US From: "Jan Mevis" Subject: RE: Yak-List: Throttle I SAW a carburettor on a Yak 52 freeze while doing a ground test (with the cowling off). It was moist, and outside temp at about 5 degrees. You could see it become all white at the outside, and the engine started tor run quite rough. Jan -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E Sent: zondag 18 oktober 2009 22:23 Subject: RE: Yak-List: Throttle MALS-14 64E" Depends who you talk to Didier. I've owned a YAK-50 for over 9 years in North Carolina and have not once experienced carb ice. Not that I am aware of anyway. On the other hand, many people on this list swear to the fact that it has happened to them more than once. I think we are ALL correct. I know it hasn't happened to me, but I believe it has happened to others. The carb we use in the M-14 is a pressure carb. But pressure carbs, even though very close to being defined as "single point fuel injection" per se, still do have a Venturi. Thus it is entirely feasible that they could develop ice. Just as a matter of curiosity, does your airplane have a carb inlet temp gage? My YAK does. It is marked to basically show the "danger range" where ice can happen. Again, on my particular airplane, there is no "carb heat" .... there is instead an intake air flap that can be closed, thus forcing the carb to draw in air from the back of the engine, which would be much warmer. But it does not actually take hot air off of a heat muff, such as the kind that is used for cabin heating. The Yak-50 does not have any cabin heat. Which... is not really a good thing. It strikes me that possibly carb icing has a ton of factors involved that make it hard to predict, and make and model of aircraft might even be a factor. I do not know. Still waiting for my own very first carb ice experience, but until it happens I don't think I will be opening and closing the carb ram air inlet flap on every landing. I suspect your design is totally different than my own. Mark Bitterlich ________________________________ From: owner-yak-list-server@matronics.com on behalf of Didier Blouzard Sent: Sun 10/18/2009 3:21 PM Subject: Re: Yak-List: Throttle OK Ok I was not aware that the M14P was particularly sensitive to carb icing. I will put full warm now on low pa.. But I will also check the tube....for sure. Thanks Kind rgards 2009/10/18 pilko2 Carburettor icing is not necessarily relevant to ambient temperature. Critical atmospheric water will not be present at -15C. Carb icing is quite common in the warm moist UK conditions, especially at low manifold settings. BEWARE ! ________________________________ From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Didier Blouzard Sent: 18 October 2009 12:41 To: yak-list@matronics.com Subject: Re: Yak-List: Throttle That's an interesting one. I thought that the M14P was very little subject to carburator icing. OK yes very interesting. Even with minus 15 I never had carb icing on that motor. But that sound like it as this effect disappear after taxiing. Has anyone else experienced such thing?? Thanks. Now I will set the carb heat on at each landing. Didier 2009/10/18 pilko2 That's likely carburettor icing restricting the butterfly/linkage movement. I've had the same and I now select carb heat on finals if there is any moisture in the air. Fly safe kp -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of tigeryak18t Sent: 17 October 2009 22:17 To: yak-list@matronics.com Subject: Yak-List: Throttle --> Now the other subject, I told you in the precedent post that I had 2 subjects....you should not be sleeping. In France it is 11h30pm but you are just waking up, so good day to all. Now I was checking my fuel gauges up there in the sky and lining up I came to the final. On short, I reduced all, and I had a surprise, the throttle did not want to go under 50%. So I continued and landed at 50%...so now I can tell you that it is possible to land on a grass strip of 700m at 50% full fine pitch and stop at the end... I went at 50% to make some fuel, and stopped the engine. Then, I started again to taxi to my hangar and made some engine runup. An dthen surprise, it worked fine. I do not know what happened, but it is a little frightenning. Not being able to reduce.. Is this something that already happenned to someone?? Anyone have an idea of what happenned.??? O now I am finished for the weekend, so good weekend to all and fly safe Didier HA-JAC 18T -------- Didier Tiger YAK18T Member of Commemorative Air Force French Wing Read this topic online here: http://forums.matronics.com/viewtopic.php?p=268350#268350 ========== rget="_blank">http://www.matronics.com/Navigator?Yak-List ========== http://forums.matronics.com ========== le, List Admin. ="_blank">http://www.matronics.com/contribution ========== -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/ Navigator?Yak-List href="http://forums.matronics.com ">http://forums.matronics.com href="http://www.matronics.com/contribution">http://www.matronics.com/c et="_blank">http://www.matronics.com/Navigator?Yak-List a>http://forums.matronics.com _blank">http://www.matronics.com/contribution -- Didier BLOUZARD didier.blouzard@gmail.com 0624243672 ________________________________ Message 12 ____________________________________ Time: 02:37:06 PM PST US From: delfin Does anyone know what helmet and mic are original military equipment for th e Yak-52.-- Im looking for the Russian- used helmet for this aircraft that mated to the Baklan 5 - thanks---- Delfin_driver =0A=0A=0A ________________________________ Message 13 ____________________________________ Time: 03:16:21 PM PST US From: Keith Pickford Subject: Re: Yak-List: Throttle Hi Didier - We have struck the same thing here in New Zealand during our cooler weather when after landing the throttle will not move. This can happen when the ca rb inlet temp is below 3'-. -I have struck it several times and after-closing the-carb inlet it c ures the problem almost immediately. Often-on cold days I will set it at about half position, If the inlet temp is kept above 3" it does not stick. Have only ever had it happen either on short finals or after landing. - Regards - Keith - Yak 52 --- On Mon, 19/10/09, Didier Blouzard wrote: From: Didier Blouzard Subject: Re: Yak-List: Throttle Received: Monday, 19 October, 2009, 10:06 AM Mark, I must say that the thing that happened seems more mechanical than ice. But I will examine all possibilities. The only thing I know is that I did not dreamed the problem. I was with a f riend owner of a 52. He is a comercial pilot. And both of us could see that the motor did not want to go under 50% even if I pushed hard on the throtl e lever. We even tried to check the pitch (going to coarse and back to fine ). After turning off the motor and refueling. At the next start everything cam e back to normal. But I did not tried the carb heat (was off) and I did not looked closely to the throtle lever. Was it completely down or was it bloc ked I am not sure. ________________________________ Message 14 ____________________________________ Time: 07:46:05 PM PST US From: bob Subject: Yak-List: CO FWIW; The thread on smoke got my curiosity up so when the chance to fly came up today I took a pocket CO meter along. On the ground, canopy closed 14 ppm, flying w/ canopy closed "0". Then to change the airflow I did some mostly positive acro ( loops & cubans) and it went up to 22 ppm. These are lower than I remember but some time back we put a metal FOD cover in the tail which would block a lot of the airflow out of the tail. That probably helped keep the CO out. With the ram air ventilation of the Yak, closing the open space on the TOP of the elevator bell crank might do more to obtain positive cabin pressure than trying to seal cockpit leaks. I am not aware of anyone that has done this. bob 52BN ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.