clutch fan
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djwarner
- Posts: 407
- Joined: Sat Jan 23, 2010 6:07 pm
- Car: 1971 240Z Series I
2006 350Z - Location: Central Florida
Re: clutch fan
Until you find replacement parts, I would suggest you drill a 1/16" hole at the very end of the cracks. Stress cracks promulgate because vibrational energy is concentrated at the point of the crack. Drilling the small hole there spreads the stress out reducing the felt strain at any particular point. This technique has been used on aircraft for many years.
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Infinitiguy19
- Posts: 7787
- Joined: Sat Dec 22, 2007 4:58 pm
- Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles
Re: clutch fan
Thats kind of scary that they just drill holes instead of replacing the part. I am no engineer but I would like to think with all the TRIPLE back up systems on a air plane. They won't just drill a hole in a fan or any other object on a PLANE instead of replacing it.
And 1990-1993 and 1994-1996 Q45 fans are different sizes so I don't think they are compatible.
And 1990-1993 and 1994-1996 Q45 fans are different sizes so I don't think they are compatible.
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djwarner
- Posts: 407
- Joined: Sat Jan 23, 2010 6:07 pm
- Car: 1971 240Z Series I
2006 350Z - Location: Central Florida
Re: clutch fan
The procedure is called "Stop Drilling".
Simply drilling a hole would suffice for a nonstructural part. A lot of parts such as fairings or access hole covers fit in this category. There's a lot of vibration in aircraft.
Many aircraft parts are custom made have no replace parts available. Replacement are either locally fabricated or the originals are repaired using standard procedures. ie, skin panels would be stop drilled and a doubler plate added. The standard of local repairs is to make the repaired part stronger than the original. Thus even if you replaced a stress cracked skin panel, you would use a heavier gauge sheet.
Unfortunately, for things that are dynamic, such as your fan blades, simple repairs would destroy the parts balance.
If you re-read my last post, I suggested stop drilling as a stop gap measure until the parts could be located and replaced.
Two things are assured. 1) If you do nothing, the crack will continue and a structural failure will result. 2) A stop drilling repair will do the least upset to balance, resonant frequencies, and remaining strength of the part.
Simply drilling a hole would suffice for a nonstructural part. A lot of parts such as fairings or access hole covers fit in this category. There's a lot of vibration in aircraft.
Many aircraft parts are custom made have no replace parts available. Replacement are either locally fabricated or the originals are repaired using standard procedures. ie, skin panels would be stop drilled and a doubler plate added. The standard of local repairs is to make the repaired part stronger than the original. Thus even if you replaced a stress cracked skin panel, you would use a heavier gauge sheet.
Unfortunately, for things that are dynamic, such as your fan blades, simple repairs would destroy the parts balance.
If you re-read my last post, I suggested stop drilling as a stop gap measure until the parts could be located and replaced.
Two things are assured. 1) If you do nothing, the crack will continue and a structural failure will result. 2) A stop drilling repair will do the least upset to balance, resonant frequencies, and remaining strength of the part.
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Infinitiguy19
- Posts: 7787
- Joined: Sat Dec 22, 2007 4:58 pm
- Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles
Re: clutch fan
I thought you meant you drill holes in fan blades/turbines on a jet engines, since you were saying to drill a hole in the clutch fan of a Q45.djwarner wrote: Unfortunately, for things that are dynamic, such as your fan blades, simple repairs would destroy the parts balance.