havard.dale(at)yaknorway.
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 Posted: Tue Jun 10, 2008 2:31 pm Post subject: SV: How many blades? |
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Hi,
I always does 24 turns, first 6 very slow to let possible oil in cylinders a chance to sip out. And the first 12 with a light hand, after 12 turns I prime 5 times and let the prime fuel help us flush away the last oil. Then I do the rest of our pre flight. Just before entering the cockpit I prime new 5 and another 6 turns light handed DO NOT USE FORCE. I jump into cockpit and strap my self in and let the primed fuel get between 2-4 min rest, then prime 1 for each 10 Celsius below 100 celsius EGT. Pump fuel pressure and hit the start button. With this procedure I have had no miss starts and the engine has not taken any damage. But remember that overpriming can cause hyd lock as well, so it is important to wait the 2-4 min and let the fuel wapour.
Best Regards
Havard Dale
www.yaknorway.com
Fra: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] På vegne av Hans Oortman
Sendt: 10. juni 2008 17:43
Til: yak-list(at)matronics.com
Emne: RE: How many blades?
True.....but......crank turing around 6 times is not completely true....don't forget the prop makes less turns than the crankshaft (1,54 if I'm not mistaking...)...i.e. the crank makes only about 4 turns.....
Fly safe!
Hans
Dutch Yak Pilot
Van: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] Namens netmaster15(at)juno.com
Verzonden: dinsdag 10 juni 2008 16:58
Aan: yak-list(at)matronics.com
Onderwerp: Re: How many blades?
I believe Ron is ASSUMING you have a 2 blade prop. If you have installed a 3 blade prop that changes things a bit.
-- ronald wasson <ronwasson(at)mindspring.com> wrote:
12 blades turns the crank around 6 times . Each piston goes up down the bore at least twice for the complete four stroke cycle. Real world I have never went more than four before I hit the lock.
On Jun 10, 2008, at 9:15 AM, Jon Boede wrote:
How many blades does it take to ensure that you've cleared all the cylinders?
I've heard to pull 6, 9, and 12.
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