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#11
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Whats the deal with counter-rotating props?
interesting... but a diagram with thrust vectors and with and without
counterrotating propellors would add to the clarification for this poster BT "Michael Ware" wrote in message . .. "Dico" wrote in message oups.com... So with counter rotating props I won't have the plane want to go left? Correct. Not when they are both running, anyway! Or I'd really have to hammer down the right rudder? Even worse if one engine quit, I could be screwed? And I'm guessing the critical engine comes into play here. Although I'm not sure if the critical engine means its the good one (its critical you keep it) or the bad one (its critical if you lose it).... check this out. http://avstop.com/Technical/twins.htm Remember, too, that with a twin (except for planes like a Cessna 337) the engines are not on the centerline of the fuselage, they are offset a few feet. -Dico |
#12
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Whats the deal with counter-rotating props?
What would you multi folks recommend as good "introductory" reading for
people considering moving up to a twin? Is there a book with a good discussion of the issues pro and con on moving from a single to a twin? Rob "BTIZ" wrote in news:CXXCf.53524$V.31153@fed1read04: ... You need to pick up and read a good multi engine training manual.. something by Kershner BT |
#13
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Whats the deal with counter-rotating props?
Thanks for the link.
A very interesting read! I'm that much smarter now! Another question... can you retro fit planes so that they have CR props? What kind of cost/job is involved? I am guessing that you'd need an engine that turns the other way and a different prop... but i'm sure there is a lot more to it. -dr |
#14
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Whats the deal with counter-rotating props?
If you are really considering a Twin Comanche, the best places for
answers to your questions are the International Comanche Society (comancheflyer.com) and the Comanche Owners' Forum in the motor transport section at delphiforums.com. There is a world of information regarding Comanches at both of those sites. Hank Henry A. Spellman Comanche N5903P Dico wrote: Hello, We're looking into a twin and the Twin Comanche is on our list. I know that the later models have the counter rotating props -- although i don't know too much about what this means, other than its "better". |
#15
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Whats the deal with counter-rotating props?
I didn't notice anyone bring this up in the thread. The AOPA published some
interesting stuff on the Twin Commanche without CR props since they were giving one away last year. With the older style twin, if you slow it down too much with the engines still developing thrust, it can flip over on its back. One of the wings is effectively flying at a couple of degrees higher angle of attach due to the prop airflow. I think this is the main reason the newer Twin Comanches went to CR props. -- Mike Noel, Tucson, Arizona 'Men never do evil so completely and cheerfully as when they do it from religious conviction.' -Blaise Pascal "Dico" wrote in message oups.com... Hello, We're looking into a twin and the Twin Comanche is on our list. I know that the later models have the counter rotating props -- although i don't know too much about what this means, other than its "better". We fly a mooney now and thus I don't worry about the prop -- as long as it keeps spinning. Is there a web site that gives a good explanation as to why I want CR props. There are hundreds of the earlier model Twin Comanches flying without the CR props --- so what does someone with 300 hours single engine time need to worry about? What actually goes wrong? And when it does, what happens? I hear "critical engine" but it means very little to me. I like to fly and try to be very careful when I do fly... but I don't follow too much aviation stuff other than how it affects me -- so I'm not exactly a "buff", hence the above questions which may seem obvious to many. Why are we looking at a Twin Comanche? Because its a twin, safer for IFR flight (perhaps this is only preceived), plus we live on the east coast on an island so we're flying over water quite a bit. Also this plane has decent speed and is an "economical" twin. We rarely fly with 4 people, so we don't need any more seats than 4. Any help or links to help would be appreciated. Thanks, Dico |
#16
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Whats the deal with counter-rotating props?
Thanks!
I will check out those sites! -Dico |
#17
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Whats the deal with counter-rotating props?
You would have to find if there is an STC to change an aircraft without CR
to CR It involves more than just swapping the engine and propeller, also the "rigging", and testing for the new MCA that the STC owner would have completed and submitted to the FAA for certification. BT "Dico" wrote in message oups.com... Thanks for the link. A very interesting read! I'm that much smarter now! Another question... can you retro fit planes so that they have CR props? What kind of cost/job is involved? I am guessing that you'd need an engine that turns the other way and a different prop... but i'm sure there is a lot more to it. -dr |
#18
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Whats the deal with counter-rotating props?
Mike,
Doesn't that happen in any non-counter-rotating and non-centerline-thrust twin when you try to operate below Vmc/se? It's been a few years, so I have to ask: do they still require a Vmc/se demonstration for the multi ticket? -----Original Message----- From: Mike Noel ] Posted At: Sunday, January 29, 2006 3:05 PM Posted To: rec.aviation.owning Conversation: Whats the deal with counter-rotating props? Subject: Whats the deal with counter-rotating props? I didn't notice anyone bring this up in the thread. The AOPA published some interesting stuff on the Twin Commanche without CR props since they were giving one away last year. With the older style twin, if you slow it down too much with the engines still developing thrust, it can flip over on its back. One of the wings is effectively flying at a couple of degrees higher angle of attach due to the prop airflow. I think this is the main reason the newer Twin Comanches went to CR props. -- Mike Noel, Tucson, Arizona 'Men never do evil so completely and cheerfully as when they do it from religious conviction.' -Blaise Pascal "Dico" wrote in message oups.com... Hello, We're looking into a twin and the Twin Comanche is on our list. I know that the later models have the counter rotating props -- although i don't know too much about what this means, other than its "better". We fly a mooney now and thus I don't worry about the prop -- as long as it keeps spinning. Is there a web site that gives a good explanation as to why I want CR props. There are hundreds of the earlier model Twin Comanches flying without the CR props --- so what does someone with 300 hours single engine time need to worry about? What actually goes wrong? And when it does, what happens? I hear "critical engine" but it means very little to me. I like to fly and try to be very careful when I do fly... but I don't follow too much aviation stuff other than how it affects me -- so I'm not exactly a "buff", hence the above questions which may seem obvious to many. Why are we looking at a Twin Comanche? Because its a twin, safer for IFR flight (perhaps this is only preceived), plus we live on the east coast on an island so we're flying over water quite a bit. Also this plane has decent speed and is an "economical" twin. We rarely fly with 4 people, so we don't need any more seats than 4. Any help or links to help would be appreciated. Thanks, Dico |
#19
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Whats the deal with counter-rotating props?
it can happen in any twin, non centerline thrust with or without CR props
it just depends on the severity and size of the rudder needed to control yes, Vmc/se is still required on the check ride BT "Jim Carter" wrote in message et... Mike, Doesn't that happen in any non-counter-rotating and non-centerline-thrust twin when you try to operate below Vmc/se? It's been a few years, so I have to ask: do they still require a Vmc/se demonstration for the multi ticket? -----Original Message----- From: Mike Noel ] Posted At: Sunday, January 29, 2006 3:05 PM Posted To: rec.aviation.owning Conversation: Whats the deal with counter-rotating props? Subject: Whats the deal with counter-rotating props? I didn't notice anyone bring this up in the thread. The AOPA published some interesting stuff on the Twin Commanche without CR props since they were giving one away last year. With the older style twin, if you slow it down too much with the engines still developing thrust, it can flip over on its back. One of the wings is effectively flying at a couple of degrees higher angle of attach due to the prop airflow. I think this is the main reason the newer Twin Comanches went to CR props. -- Mike Noel, Tucson, Arizona 'Men never do evil so completely and cheerfully as when they do it from religious conviction.' -Blaise Pascal "Dico" wrote in message oups.com... Hello, We're looking into a twin and the Twin Comanche is on our list. I know that the later models have the counter rotating props -- although i don't know too much about what this means, other than its "better". We fly a mooney now and thus I don't worry about the prop -- as long as it keeps spinning. Is there a web site that gives a good explanation as to why I want CR props. There are hundreds of the earlier model Twin Comanches flying without the CR props --- so what does someone with 300 hours single engine time need to worry about? What actually goes wrong? And when it does, what happens? I hear "critical engine" but it means very little to me. I like to fly and try to be very careful when I do fly... but I don't follow too much aviation stuff other than how it affects me -- so I'm not exactly a "buff", hence the above questions which may seem obvious to many. Why are we looking at a Twin Comanche? Because its a twin, safer for IFR flight (perhaps this is only preceived), plus we live on the east coast on an island so we're flying over water quite a bit. Also this plane has decent speed and is an "economical" twin. We rarely fly with 4 people, so we don't need any more seats than 4. Any help or links to help would be appreciated. Thanks, Dico |
#20
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Whats the deal with counter-rotating props?
One of my favorites is Bob Gardner's book The Complete Multi-Engine Pilot.
It's written in a very easy to read down to earth manner. The Jeppesen Guided Flight Discovery, Multi Engine book is very complete, but in my opinion hard to read due to the distracting pictures and captions. Jim Rob McDonald" wrote in message ... What would you multi folks recommend as good "introductory" reading for people considering moving up to a twin? Is there a book with a good discussion of the issues pro and con on moving from a single to a twin? Rob "BTIZ" wrote in news:CXXCf.53524$V.31153@fed1read04: ... You need to pick up and read a good multi engine training manual.. something by Kershner BT |
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