207WF Posted May 11, 2016 Report Share Posted May 11, 2016 Has anyone done this to their CTs? What were the results? WF Link to comment Share on other sites More sharing options...
Anticept Posted May 11, 2016 Report Share Posted May 11, 2016 Yes, and it was moderately out of balance. I don't remember the original reading... I think it was around .4 to .5 ips. I got it down to .02. Flew for a few hundred hours, nice thing was that the exhaust stopped cracking all the damn time. Link to comment Share on other sites More sharing options...
Runtoeat Posted May 12, 2016 Report Share Posted May 12, 2016 I had my CT's prop balanced. The prop wasn't that far out but it was enough to warrant having this done. This improves cabin comfort but the important things is prop vibration can be detrimental to engine components - as Corey points out with his remarks about exhaust cracks. Air frame components might also be affected by vibrations which originate at the prop if these vibrations are not attenuated by the engine mounts. There's a good article on prop balancing in this month's EAA Sport Aviation mag. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted May 12, 2016 Report Share Posted May 12, 2016 Had mine done. Big difference in felt vibration. Mine was pretty bad out, near the limits...it went from 0.6 to 0.05. Link to comment Share on other sites More sharing options...
mpolat Posted May 22, 2016 Report Share Posted May 22, 2016 Had mine done. Big difference in felt vibration. Mine was pretty bad out, near the limits...it went from 0.6 to 0.05. Hi , what is the meaning of 0.6 to 0.05 how do do you gauge it ? can you do the balancing by your self ? thaks.. Link to comment Share on other sites More sharing options...
Anticept Posted May 22, 2016 Report Share Posted May 22, 2016 You have to use specialized equipment to dynamic balance a prop. They cost thousands. Those measurements are in inches per second (but since it's supposed to be acceleration, it should actually be inches per second per second). Link to comment Share on other sites More sharing options...
mpolat Posted May 22, 2016 Report Share Posted May 22, 2016 Thanks for the reply. My ctls is 2009 model and on 545 h. I have a vibration problem for the last 40-50 h. We checked for the carb sync. But it was ok. I noticed that propeller's blades are tracking in different paths. Not cycling on the same path.1-3 cm distance between two paths. when the engine is cold and when it s on low rpm there is a big vibration. on hi rpm s it looks normal. I am using a neuform 3 blade propeller. What do i have to do? Link to comment Share on other sites More sharing options...
Anticept Posted May 22, 2016 Report Share Posted May 22, 2016 Check to see if a blade is damaged. 1-3cm off track is HUGE and a very serious concern. Link to comment Share on other sites More sharing options...
mpolat Posted May 22, 2016 Report Share Posted May 22, 2016 There is no damage on the blades Link to comment Share on other sites More sharing options...
Roger Lee Posted May 22, 2016 Report Share Posted May 22, 2016 My Aces balancer cost $4K. They aren't cheap. Link to comment Share on other sites More sharing options...
Anticept Posted May 22, 2016 Report Share Posted May 22, 2016 There is no damage on the blades You should check tracking by hand, rotating slowly, preferably with plugs off. If you still see the abnormal tracing, you need to take apart the prop. 1-3cm is HUGE and extremely abnormal. SOMETHING is wrong. Check to make sure the hub isn't damaged, or that the prop isn't separating from the flange, and make sure the blade angles are set correctly. Link to comment Share on other sites More sharing options...
FastEddieB Posted May 22, 2016 Report Share Posted May 22, 2016 Our local A & P is getting a dynamic balancer. I think he said $275 or thereabouts for a balance. $75 if the machine shows the prop "close enough". I'm thinking about getting it done. Link to comment Share on other sites More sharing options...
mpolat Posted May 22, 2016 Report Share Posted May 22, 2016 Is it possible that blade angels will change by them self? if one of the blade s angle is higher than the others , it will track in a front line from the others. And this can cause a vibration.. on high rpm s it is all normal. I dont know what to do? do you think , do i have to send them back to neuform to check for the balance? someone told me that there is a soft material inside the blades. by the time they can change the balance and they have to be checked by the producter. I am confused Link to comment Share on other sites More sharing options...
Anticept Posted May 22, 2016 Report Share Posted May 22, 2016 I can't give a lot of advice without seeing it myself. If you're saying the track is 1-3cm off, then you NEED To check it. Yes, the blades can move on their own, especially if the bolt torque hasn't been checked in a long time. Vibration can loosen bolts. If that 1-3cm variation is caused by blade angle variation, then those blades will be noticeably off. Regardless of the cause, you really should take a close look at the prop hub, blades, etc. I've only seen damaged blades track this far off. Are you checking track in this manner? Link to comment Share on other sites More sharing options...
mpolat Posted May 23, 2016 Report Share Posted May 23, 2016 thank you a lot... this will help me a lot. and it is easy to do. 1-3 cm tracking mistake is when the engine is running in 2500-3000 rpm. when you turn it by hand slowly you it much more less. I think that if one of the blades attack angle is higher than the other , it will try to track in a fronter line from the others. and this will cause vibration. thanks a lot agian. this weekend i will go to hangar to check it again like this method and i will share my experiences. nice to meet you .. mehmet Link to comment Share on other sites More sharing options...
Tip Posted May 23, 2016 Report Share Posted May 23, 2016 Where and what did you guys use to add weight? Link to comment Share on other sites More sharing options...
Roger Lee Posted May 23, 2016 Report Share Posted May 23, 2016 FD puts a small screw on the backplate of the spinner and close to the top. Link to comment Share on other sites More sharing options...
Anticept Posted May 23, 2016 Report Share Posted May 23, 2016 thank you a lot... this will help me a lot. and it is easy to do. 1-3 cm tracking mistake is when the engine is running in 2500-3000 rpm. when you turn it by hand slowly you it much more less. I think that if one of the blades attack angle is higher than the other , it will try to track in a fronter line from the others. and this will cause vibration. thanks a lot agian. this weekend i will go to hangar to check it again like this method and i will share my experiences. nice to meet you .. mehmet Ah OK, then you don't have to worry if it's pretty close. You don't want to check blade tracking on a prop while the engine is running because the tail movement is significant (helis are checked while running though!). You can use an angle gauge or prop protractor to correct the blade, but it is absolutely critical that you use a careful, deliberate, and precise process to set it. You need to use a common point on the airplane itself to set the blades, as even rotating and mucking about with the blades will shift it around a little. I often use the hub as my calibration point, and I re-zero after each reading or adjustment. I aim for no more than 1/10th of a degree variation between all of them. As you torque the bolts, the angle will change. Tighten a little at a time and recheck. Once you get around half torque, they won't shift much anymore. Link to comment Share on other sites More sharing options...
mpolat Posted May 23, 2016 Report Share Posted May 23, 2016 thanks . I will do it with a tecnician. It s little bit much for me for the first time I dont have the neuforms adjustment tool. but tecnicians in turkey make tools for them self. if one blade is in an different angle to the others , I will only adjust that one and wont touch the other blades. is that correct ? or do I have to set all of them from the zero ? Link to comment Share on other sites More sharing options...
Anticept Posted May 23, 2016 Report Share Posted May 23, 2016 Just make sure they all match, and you get the correct RPM. You can use an angle gauge or prop protractor. It's actually quite commonly known how to do it. You should first determine if your RPM is correct for in flight WOT, and if so, record what your ground static RPM at WOT and check after adjustment. If you have one blade way off, you will end up adjusting all of them. Once that is done, do a runup, and recheck torque. You can do a dynamic balance now. Then after that, say around 25 hrs, recheck and retorque to make sure it hasn't moved. When you change blade angles at all, your dynamic balance is invalidated and have to do it again. Link to comment Share on other sites More sharing options...
mpolat Posted May 23, 2016 Report Share Posted May 23, 2016 thanks a lot. this weekend we will work on it. Link to comment Share on other sites More sharing options...
ct9000 Posted May 24, 2016 Report Share Posted May 24, 2016 Where and what did you guys use to add weight? I add a little paint to the band at the blade tip . Link to comment Share on other sites More sharing options...
ls6pilot Posted July 17, 2018 Report Share Posted July 17, 2018 Andy, Where did you get your prop balanced? Rich Link to comment Share on other sites More sharing options...
FlyingMonkey Posted July 17, 2018 Report Share Posted July 17, 2018 1 hour ago, ls6pilot said: Andy, Where did you get your prop balanced? Rich Lockwood. Link to comment Share on other sites More sharing options...
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