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jblake207(at)comcast.net
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 Posted: Thu Feb 20, 2014 10:21 am Post subject: propeller pull through procedure |
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dabear
Joined: 21 Jan 2011
Posts: 92
Location: Warrenton, VA
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| Posted: Thu Feb 20, 2014 10:41 am Post subject: propeller pull through procedure |
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Same as the number of licks in a tootsie Pop…. 2
That’s all you need.
Bear
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] On Behalf Of Todd McCutchan
Sent: Wednesday, February 19, 2014 2:48 PM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Re: propeller pull through procedure
Ok. So how many blades for 2 blade & 3 blade to get all 9 cyl for those of us that are math challenged?
Todd McCutchan
T-34A & Yak-50
Cell: (260) 402-1740
E-mail: todd(at)fastaircraft.com (todd(at)fastaircraft.com)
www.fastaircraft.com
On Feb 19, 2014, at 1:20 PM, "Gill Gutierrez" <gill.g(at)gpimail.com (gill.g(at)gpimail.com)> wrote:
[quote]
--> Yak-List message posted by: "Gill Gutierrez" <gill.g(at)gpimail.com (gill.g(at)gpimail.com)>
This backwards - 720 degrees prop rotation equals 1094 degrees engine
rotation
Gill
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mikecavanagh1(at)hotmail.
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| Posted: Sat Feb 22, 2014 7:49 pm Post subject: propeller pull through procedure |
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Has anyone factored the pi root of I into the equation and don't forget that if you pull it through with your plugs out you won't clear the intakes. You will bust your engine bigger than shit....I know from experience. Duck
Sent from my iPad
On Feb 20, 2014, at 11:48 AM, "Walter Lannon" <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:
[quote] There seems to be a number of different methods for determining number of rotations to complete a full cycle. Mostly wrong.
The key is the Otto cycle itself. It needs two revolutions to complete and has a number of events taking place at very specific points in the cycle. If you stack a number of these cylinders together whether in a line or circle or whatever it becomes clear that there must be a specific interval for those events between cylinders.
The design itself indicates that interval is 180 degs.
To fully cycle 9 cylinders then requires a crankshaft rotation of 1620 degs. (9X180). 1620/360 = 4.5 revolutions for a direct drive engine.
For the M14P: 4.5 X 0.658 X 2 (blades) = 5.922 turns OR 1620 X 0.658 = 1065.96 X 2 = 2132.92/360 = 5.922 turns.
For the HS6A the gear ratio is 0.787. The above is for two blades. I hate three blades causes there is always one in the way to hit my head on.
Walt
From: Todd McCutchan (todd(at)fastaircraft.com)
Sent: Wednesday, February 19, 2014 10:59 PM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Re: propeller pull through procedure
So I get 9.12 blades for complete rotation (1094/120) which means 10 blades to clear all yes?
Todd McCutchan T-34A & Yak-50
Cell: (260) 402-1740
E-mail: todd(at)fastaircraft.com (todd(at)fastaircraft.com)
www.fastaircraft.com
On Feb 19, 2014, at 2:12 PM, "LawnDart" <propwash(at)gmail.com (propwash(at)gmail.com)> wrote:
[b]
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milescrane
Joined: 04 Jun 2013
Posts: 2
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| Posted: Sun Mar 02, 2014 8:35 pm Post subject: Re: propeller pull through procedure |
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Every piston travels fully with each rotation of the crank, as for a one cylinder engine. Two rotations complete a 'cycle'. To be sure all of them have completed every stage of the cycle, one additional turn would do it, but I agree that more turns are a good idea.
Be careful if someone wants to help- they may not realize that this is not to be confused with a day at the gym!
As others have indicated, damage is possible by hand.
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