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Charles Heathco
Joined: 10 Jan 2006
Posts: 201
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 Posted: Sun Nov 01, 2009 3:43 am Post subject: Using the firmer engine mounts. |
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I only have 280 or so hrs on my 6a, but engine saging at least 3/8th inch at prop. I can lift it up about 1/4 inch, so mounts need replacing for sure. I have heard of the aerobatic mounts, Im told they can make for more vibration, being stiffer. Think its counter productive to use Vans as replacement, as these have relative low time. I dont realy do much arebatics, but like to do up to 5g pulls. Would like coments from anyone who has replaced mounts with the stiffer ones. Charlie H
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pitts_pilot(at)bellsouth.
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| Posted: Sun Nov 01, 2009 5:38 am Post subject: Using the firmer engine mounts. |
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The stiffer aerobatic mounts keep the engine from moving around during violent maneuvers. Your mount sagging is plainly due to constant pressure, not the transient pressure of aerobatics. My suggestion .... because I'm cheap .... is to place washers under the lower mounts to raise the engine back up. My experience says that once the mounts are compressed and have some age on them ..... they quit sagging. At some point you may want to swap the top ones with the bottom. Remember that the harder the mounts, the more vibration is transferred to the airframe with fatigue becoming a problem .... especially if you have mechanical gyros.
Linn
charlie heathco wrote: [quote] I only have 280 or so hrs on my 6a, but engine saging at least 3/8th inch at prop. I can lift it up about 1/4 inch, so mounts need replacing for sure. I have heard of the aerobatic mounts, Im told they can make for more vibration, being stiffer. Think its counter productive to use Vans as replacement, as these have relative low time. I dont realy do much arebatics, but like to do up to 5g pulls. Would like coments from anyone who has replaced mounts with the stiffer ones. Charlie H
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href="http://www.aeroelectric.com">www.aeroelectric.com
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n223rv(at)wolflakeairport
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| Posted: Sun Nov 01, 2009 10:49 am Post subject: Using the firmer engine mounts. |
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I had the same issue, installed washers and it fixed the issue.
Sent from my iPhone
On Nov 1, 2009, at 8:34 AM, Linn Walters <pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)> wrote:
[quote] The stiffer aerobatic mounts keep the engine from moving around during violent maneuvers. Your mount sagging is plainly due to constant pressure, not the transient pressure of aerobatics. My suggestion .... because I'm cheap .... is to place washers under the lower mounts to raise the engine back up. My experience says that once the mounts are compressed and have some age on them ..... they quit sagging. At some point you may want to swap the top ones with the bottom. Remember that the harder the mounts, the more vibration is transferred to the airframe with fatigue becoming a problem .... especially if you have mechanical gyros.
Linn
charlie heathco wrote: | Quote: | I only have 280 or so hrs on my 6a, but engine saging at least 3/8th inch at prop. I can lift it up about 1/4 inch, so mounts need replacing for sure. I have heard of the aerobatic mounts, Im told they can make for more vibration, being stiffer. Think its counter productive to use Vans as replacement, as these have relative low time. I dont realy do much arebatics, but like to do up to 5g pulls. Would like coments from anyone who has replaced mounts with the stiffer ones. Charlie H
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http://www.matronics.com/Navigator?RV-List |
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