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#1
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Cold Start Question
Gang,
A friend has heard that pulling the prop control out to make coarse pitch aids starting (when the engine has had trouble starting). Has anyone ever heard of this technique? Andy ANDY'S HANGAR http://webpages.charter.net/andyshangar/ |
#2
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Andy Shane wrote: Gang, A friend has heard that pulling the prop control out to make coarse pitch aids starting (when the engine has had trouble starting). Has anyone ever heard of this technique? I can't imagine it changes anything with the prop at that speed. It may have something to do with getting the oil flowing into the hub. |
#3
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I would think that during starting, the rpm is well below prop governing
range.. and it would have no effect.. I have never heard of this procedure. BT "Andy Shane" wrote in message news Gang, A friend has heard that pulling the prop control out to make coarse pitch aids starting (when the engine has had trouble starting). Has anyone ever heard of this technique? Andy ANDY'S HANGAR http://webpages.charter.net/andyshangar/ |
#4
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In article .com,
"Robert M. Gary" wrote: I can't imagine it changes anything with the prop at that speed. It may have something to do with getting the oil flowing into the hub. Even with the prop control out the oil flow won't change until the governor decides it needs to govern and that won't happen until you increase power. -- Dale L. Falk There is nothing - absolutely nothing - half so much worth doing as simply messing around with airplanes. http://home.gci.net/~sncdfalk/flying.html |
#5
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Andy,
It is a procedure used on a few radial engines, such as on the Jacobs on a Cessna 195, however, the prop has to be pulled back to low rpm (coarse pitch) prior to shutdown, not on startup. For horizontally opposed engines (singles) it has no effect, the prop is on the low pitch locks and is being held there by the spring and will stay there until the rpm is high enough for the prop to govern. All the best, Rick |
#6
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On 10 Jan 2005 13:28:19 -0800, "Robert M. Gary"
wrote: Andy Shane wrote: Gang, A friend has heard that pulling the prop control out to make coarse pitch aids starting (when the engine has had trouble starting). Has anyone ever heard of this technique? I can't imagine it changes anything with the prop at that speed. It may have something to do with getting the oil flowing into the hub At low RPM it shouldn't even do that. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
#7
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BTIZ opined
I would think that during starting, the rpm is well below prop governing range.. and it would have no effect.. I have never heard of this procedure. Even if the prop did change pitch, it would do any good. All that would happen is that there would be more prop drag while the engine is trying to start. "Andy Shane" wrote in message news Gang, A friend has heard that pulling the prop control out to make coarse pitch aids starting (when the engine has had trouble starting). Has anyone ever heard of this technique? Andy ANDY'S HANGAR http://webpages.charter.net/andyshangar/ -ash Cthulhu in 2005! Why wait for nature? |
#8
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Thanks to everyone for their input.
Russ Bird, who is also on this group, is new again to general aviation, and was wondering if the technique could help in starting the C182 he flies. We both fly the 777 for one of the majors, Russ as captain and me as copilot. Here is a recent pic of my own old Cessna: http://webpages.charter.net/andyshan.../premating.bmp Fly safe! Andy Shane ANDY'S HANGAR http://webpages.charter.net/andyshangar/ |
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