YAK52 information
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Fair call SSD. I do have the luxury of hangarage in winter. I also seem to run quite low air pressure so I would not get too many chances to allow me to underprime. I follow the recommended priming of one full priming shot for every 10 degrees centigrade below 110 on the CHT. On my own, after having pulled through to clear any oil, I give 5 shots, then get down and pull through 5 blades, then 4 /5 more shots, then 5 blades. Get in and start. Seems to work for my engine, but they are all a little different. I always prime cylinders with 2 / 3 shots whilst the engine is compressing in the start too (obviously only for the first cold start of the day though).
Cheers
[This message has been edited by Southern Cross (edited 27 February 2001).]
Cheers
[This message has been edited by Southern Cross (edited 27 February 2001).]
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SSD
I had a few thoughts about the "wellie on a rope" idea. I don't like it too much - too many possibilities to get the rope caught in the blade or the wellie stuck on blade for a couple of rotations, pulling you in very quickly towards the rotating blades (not to mention fouling your expensive prop!). I know that some Yak owners have quite successfully hand swung their engines into action having been caught out with zero air pressure for one reason or another. At least using a correct technique one ought to be able to swing it safely (you would need to ensure it was very securely chocked as no air pressure to start also means no brakes). With the 52, the prop stands perpendicular to the ground - helps hand swinging. With the Yak 50, hand swinging would require even more care as the angle that the prop stands to the ground (being a tailwheel) means that it is closer to the body at the bottom of its arc than at the top...
Just thoughts (to get the Yak thread back to the top of Private Flying!)
Cheers
I had a few thoughts about the "wellie on a rope" idea. I don't like it too much - too many possibilities to get the rope caught in the blade or the wellie stuck on blade for a couple of rotations, pulling you in very quickly towards the rotating blades (not to mention fouling your expensive prop!). I know that some Yak owners have quite successfully hand swung their engines into action having been caught out with zero air pressure for one reason or another. At least using a correct technique one ought to be able to swing it safely (you would need to ensure it was very securely chocked as no air pressure to start also means no brakes). With the 52, the prop stands perpendicular to the ground - helps hand swinging. With the Yak 50, hand swinging would require even more care as the angle that the prop stands to the ground (being a tailwheel) means that it is closer to the body at the bottom of its arc than at the top...
Just thoughts (to get the Yak thread back to the top of Private Flying!)
Cheers
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Southern Cross
I wouldn't consider the 'welly and a rope' for the reasons you state. But a properly-made leather pouch, open-sided at the 'pulling' side (where the rope is attached) so it will slide off the prop as it rotates might be OK.
I'm an experienced hand-swinger (mostly of the Chippy) and have no qualms with that aeroplane. But I wouldn't like to hand-swing a '52. With the Chippy, you can 'flick' the prop down as you walk away from it and by the time it starts you are several yards away. The '52 takes some grunt to pull through - big geared engine.
No thanks!
SSD
I wouldn't consider the 'welly and a rope' for the reasons you state. But a properly-made leather pouch, open-sided at the 'pulling' side (where the rope is attached) so it will slide off the prop as it rotates might be OK.
I'm an experienced hand-swinger (mostly of the Chippy) and have no qualms with that aeroplane. But I wouldn't like to hand-swing a '52. With the Chippy, you can 'flick' the prop down as you walk away from it and by the time it starts you are several yards away. The '52 takes some grunt to pull through - big geared engine.
No thanks!
SSD
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SSD
I also wouldn't be too keen to hand swing the M14P, especially if it was cold. Since you would need to get in close to get leverage....as you say, you probably can't just flick the prop and walk away. However, it must be possible particularly if the oil is hot.
Presumably if you used a leather pouch etc as you describe, the prop would be in a vertical position so you could pull it from the side?
Where are you based?
I also wouldn't be too keen to hand swing the M14P, especially if it was cold. Since you would need to get in close to get leverage....as you say, you probably can't just flick the prop and walk away. However, it must be possible particularly if the oil is hot.
Presumably if you used a leather pouch etc as you describe, the prop would be in a vertical position so you could pull it from the side?
Where are you based?
