Hand flipping prop position
#1
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From: Arlington,
TX
Can some one be kind enough to post a pic or two of the propper way a prop should be set for hand flipping? Im about to drill my prop for my new dle 35 and want to set the drill holes the right way as its my first time to do so. Thank you.
Scott
Scott
#2

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If the plane is a tail dragger I like to set the 2-blade prop close to 2&8 o'clock when compression is first encountered. This is for a magneto or electronic ignition. When the piston reaches top-dead-center the prop should be around 12&6 o'clock and if it has an electronic ignition the magnetic on the hub should be passing under the pick-up.
That way when you have a dead-stick you are not coming in with the prop stuck at 12&6 o'clock.
Don't have any pics handy but simply picture a clock face on the front of the engine and align the prop that way.
That way when you have a dead-stick you are not coming in with the prop stuck at 12&6 o'clock.
Don't have any pics handy but simply picture a clock face on the front of the engine and align the prop that way.
#3
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ORIGINAL: flyinwalenda
If the plane is a tail dragger I like to set the 2-blade prop close to 2&8 o'clock when compression is first encountered. This is for a magneto or electronic ignition. When the piston reaches top-dead-center the prop should be around 12&6 o'clock and if it has an electronic ignition the magnetic on the hub should be passing under the pick-up.
That way when you have a dead-stick you are not coming in with the prop stuck at 12&6 o'clock.
Don't have any pics handy but simply picture a clock face on the front of the engine and align the prop that way.
If the plane is a tail dragger I like to set the 2-blade prop close to 2&8 o'clock when compression is first encountered. This is for a magneto or electronic ignition. When the piston reaches top-dead-center the prop should be around 12&6 o'clock and if it has an electronic ignition the magnetic on the hub should be passing under the pick-up.
That way when you have a dead-stick you are not coming in with the prop stuck at 12&6 o'clock.
Don't have any pics handy but simply picture a clock face on the front of the engine and align the prop that way.
Also when you do hand prop it at the 2 o'clock position, your hand moves away from prop rotation.
#4

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+2 for the above positioning. It also has the advantage (or at least I think it's an advantage....) of allowing you to flip through the compression with your hand going across the front of the model and not down which makes it hard to maintain your balance, or up which tends to lift the model.
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From: Keller, TX
Years ago, I got into the practice of setting up the prop for hand starting my magneto engines which require the magnets to pass the coil at a good speed to generate a strong spark. I set it for the prop to be at 9 o'clock at compression and start the prop from about 12 o'clock so that when it gets to 9 it is carrying some speed. This also puts the force of the flip at compression in a vertical plane which is better carried by the landing gear, rather than a horizontal force which pushes the plane sideways. I still do that, even with my CDI engines to keep the vertical force on the gear.
Coming to gas from running glow many years, I quickly figured out that starting a mag engine from up against compression like a glow, doesn't work too well. CDI is more tolerant but still needs a good firm flip.
Coming to gas from running glow many years, I quickly figured out that starting a mag engine from up against compression like a glow, doesn't work too well. CDI is more tolerant but still needs a good firm flip.



