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Heimie

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Everything posted by Heimie

  1. Something you can try, I don't think this is the proper way to do things, but if you are out of ideas you can play around with it. Just be careful with this, because it could throw everything else off. The nice part of rigging is you can disconnect things and line up holes. You can disconnect the 36" rod from the intermediate bellcrank, rotate the input lever to reverse, and with the coordinator at 0 degrees, find out what isn't lined up. Just be careful, you adjust one thing to get reverse to line up and it might throw other things off, but it might give you some insight. Also, make sure it pins in feather. If the 36" and 24" rod aren't adjusted properly, they won't give you the entire spread needed to reach both holes, as the 36" and 24" rods push and pull the bellcrank which rotates the input lever through the 6 1/2" rod. Just an idea, just make sure you rig from the rear forward, otherwise you will chase the problem back into the engine. Rigging is definately one of those things that you just have to play with, but it is how I would go about this problem based on what you have done already. Good luck!
  2. For the most part, RPM out of LSGI is controlled by the fuel scheduling/rigging along with proper blade angle. For example, if you have a certain amount of fuel flowing at normal ground idle, increasing blade angle out of it's limit of 5-6 degrees will increase the amount of air the prop bites thus decreasing RPM. So if your RPM is close in ground idle: 94-102, you can make sure your blade angle on the protractor while rigging the prop is within 5-6 degree. Closer to 6 will decrease RPM, closer to 5 will increase RPM enough to get you by. On the other hand, if blade angles are proper and rigging is where it is supposed to be, both coordinator to prop, coordinator to fuel control, then there is a possibility of fuel scheduling problems. Do a rich/lean check to find out if your fuel control and valve are working the way they are supposed to. Other than that, there is no reason why adjusting the low pitch stop wouldn't change RPM a bit. Just remember to keep the blade angle of the adjustment between 24.5-25.5 degree. When adjusting down, make sure your top of beta and flight idle torque spread still match the 500-2000 in. lbs torque increase. I would definately make sure your blade angles are rigged properly on the protrator in the valve housing: Ground Idle: 5-6 degrees Flight Idle: Less than 17.5 degrees Pop-out: 24.5-25.5 degrees Feather: 92.5 Adjusting ground idle up and down will directly affect flight idle. If the spread is too much, check your rigging again. Hope this gives you somewhere to start.
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