X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 20 May 2011 07:52:55 -0400 Message-ID: X-Original-Return-Path: Received: from cgpro2.tulsaconnect.com ([65.38.1.5] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4988983 for lml@lancaironline.net; Thu, 19 May 2011 17:25:20 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.38.1.5; envelope-from=kent@tulsaconnect.com Received: from [65.38.9.183] (HELO main) by cgpro2.tulsaconnect.com (CommuniGate Pro SMTP 5.2.1) with SMTP id 58594414 for lml@lancaironline.net; Thu, 19 May 2011 16:24:45 -0500 X-Original-Message-ID: From: "Kent" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] FW: LNC2 Vibration Issues X-Original-Date: Thu, 19 May 2011 16:24:45 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0030_01CC1641.43E24790" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6090 This is a multi-part message in MIME format. ------=_NextPart_000_0030_01CC1641.43E24790 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Due to my 24 years experience, I would suspect the prop's blade angles = being mismatched. It is unusual to see a major changin IPS level over with a small change = of cruise rpm,. I think I would be talking to the prop shop Kent Felkins Tulsa Ollahoma ----- Original Message -----=20 From: TOM GARDINER=20 To: lml@lancaironline.net=20 Sent: Thursday, May 19, 2011 3:45 PM Subject: [LML] FW: LNC2 Vibration Issues ----Forwarded Message---- From: n20087@yahoo.com To: n20087@yahoo.com Sent: Thu May 19th, 2011 11:26 AM EDT Subject: LNC2 Vibration Issues Folks=20 I am dealing with a vexing problem which has plagued me throughout my phase 1 testing and that is, I can't get rid of vibration from my = engine prop combination. I am running a Lycoming IO360/Slick Mags = (non-counter weighted crank) with a new Hartzell HC-C2YK-1BF/F7666A.=20 The prop was dynamically balanced on the ground at 23" map and 2400rpm to 0.05ips. Interesting thing is the vibration increases = significantly to 0.25ips at 2500RPM on the ground. When flying, I can see the ASI needle vibrate a little (+/- 0.5mm) at high power settings >19Inches = and any RPM. I have not been able to measure the vibration in the air since it is difficult to mount an accelerometer in the vertical plane under the cowl but I do see the stick vibrate a little from side to = side when I let it go. Some additional background: 1. The engine has accumulated 44 hours since new 2. The crank was dynamically balanced at the factory 3. When the engine was built it was tested with a club and found to be vibration free 4. The prop has a 4" extension by Sabre Industries 5. The balancing weight was mounted to the flywheel in the form = of an AN3 bolt/nut (20 grams) 6. The spinner is solidly fixed to the prop and back plate and = is centered=20 7. The crossover exhaust and tailpipes are fixed to the engine only 8. The cylinders are 9:1 compression 9. All cylinder compressions are even and in the 70s 10. The engine mount bolts are torqued correctly to 40-45ftlb 11. The engine does not/cannot touch the cowl When I tested the aircraft at 17,500 feet, I noted the vibration was significantly less pronounced or non-existent due to the low power output. I noticed the same thing in cruise decent at 18 inches or lower. Talking to the prop balancing mechanic, he stated that it is unusual for balance to be ok at 2400 RPM but to be significantly different at 2500RPM+. =20 I would be very grateful for any help and assistance from anybody with knowledge or experience in correcting vibration issues such as the one = I described above =20 Thanks =20 Tom=20 =20 -------------------------------------------------------------------------= ----- ----Forwarded Message---- From: n20087@yahoo.com To: n20087@yahoo.com To: n20087@yahoo.com Sent: Thu May 19th, 2011 11:26 AM EDT Subject: LNC2 Vibration Issues Folks=20 I am dealing with a vexing problem which has plagued me throughout my = phase 1 testing and that is, I can't get rid of vibration from my engine = prop combination. I am running a Lycoming IO360/Slick Mags (non-counter = weighted crank) with a new Hartzell HC-C2YK-1BF/F7666A.=20 The prop was dynamically balanced on the ground at 23" map and 2400rpm = to 0.05ips. Interesting thing is the vibration increases significantly = to 0.25ips at 2500RPM on the ground. When flying, I can see the ASI = needle vibrate a little (+/- 0.5mm) at high power settings >19Inches and = any RPM. I have not been able to measure the vibration in the air = since it is difficult to mount an accelerometer in the vertical plane = under the cowl but I do see the stick vibrate a little from side to side = when I let it go. Some additional background: 1. The engine has accumulated 44 hours since new 2. The crank was dynamically balanced at the factory 3. When the engine was built it was tested with a club and found = to be vibration free 4. The prop has a 4" extension by Sabre Industries 5. The balancing weight was mounted to the flywheel in the form = of an AN3 bolt/nut (20 grams) 6. The spinner is solidly fixed to the prop and back plate and = is centered=20 7. The crossover exhaust and tailpipes are fixed to the engine = only 8. The cylinders are 9:1 compression 9. All cylinder compressions are even and in the 70s 10. The engine mount bolts are torqued correctly to 40-45ftlb 11. The engine does not/cannot touch the cowl When I tested the aircraft at 17,500 feet, I noted the vibration was = significantly less pronounced or non-existent due to the low power = output. I noticed the same thing in cruise decent at 18 inches or = lower. Talking to the prop balancing mechanic, he stated that it is = unusual for balance to be ok at 2400 RPM but to be significantly = different at 2500RPM+. =20 I would be very grateful for any help and assistance from anybody with = knowledge or experience in correcting vibration issues such as the one I = described above Thanks Tom=20 -------------------------------------------------------------------------= ----- -- For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html -------------------------------------------------------------------------= ----- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1375 / Virus Database: 1509/3647 - Release Date: = 05/19/11 ------=_NextPart_000_0030_01CC1641.43E24790 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Due to my 24 years experience,  I = would=20 suspect the prop's blade angles being mismatched.
 
It is unusual to see a major changin = IPS level=20 over  with a small change of cruise rpm,.
 
I think I would be talking to the prop=20 shop
 
Kent Felkins
Tulsa Ollahoma
----- Original Message -----
From:=20 TOM = GARDINER=20
Sent: Thursday, May 19, 2011 = 3:45=20 PM
Subject: [LML] FW: LNC2 = Vibration=20 Issues



----Forwarded Message----
From: n20087@yahoo.com
To: n20087@yahoo.com
Sent: Thu May = 19th,=20 2011 11:26 AM EDT
Subject: LNC2 Vibration Issues

Folks =

I am=20 dealing with a vexing problem which has plagued me throughout = my
phase 1=20 testing and that is, I can't get rid of vibration from my = engine
prop=20 combination.  I am running a Lycoming IO360/Slick Mags=20 (non-counter
weighted crank) with a new Hartzell = HC-C2YK-1BF/F7666A.=20

The prop was dynamically balanced on the ground at 23" map and = 2400rpm
to 0.05ips.  Interesting thing is the vibration = increases=20 significantly
to 0.25ips at 2500RPM on the ground.  When = flying, I can=20 see the ASI
needle vibrate a little (+/- 0.5mm) at high power = settings=20 >19Inches and
any RPM.    I have not been able to = measure=20 the vibration in the air
since it is difficult to mount an = accelerometer in=20 the vertical plane
under the cowl but I do see the stick vibrate a = little=20 from side to side
when I let it go.

Some additional=20 background:

1.       The engine = has=20 accumulated 44 hours since = new

2.      =20 The crank was dynamically balanced at the=20 factory

3.       When the engine = was=20 built it was tested with a club and found
to be vibration=20 free

4.       The prop has a 4" = extension=20 by Sabre Industries

5.       The=20 balancing weight was mounted to the flywheel in the form of
an AN3 = bolt/nut=20 (20 grams)

6.       The spinner = is=20 solidly fixed to the prop and back plate and is
centered=20

7.       The crossover exhaust = and=20 tailpipes are fixed to the=20 engine
only

8.       The = cylinders are=20 9:1 compression

9.       All = cylinder=20 compressions are even and in the 70s

10.   The engine = mount=20 bolts are torqued correctly to 40-45ftlb

11.   The = engine=20 does not/cannot touch the cowl

When I tested the aircraft at = 17,500=20 feet, I noted the vibration was
significantly less pronounced or=20 non-existent due to the low power
output.  I noticed the same = thing in=20 cruise decent at 18 inches or
lower.  Talking to the prop = balancing=20 mechanic, he stated that it is
unusual for balance to be ok at 2400 = RPM but=20 to be significantly
different at 2500RPM+. 

I would be = very=20 grateful for any help and assistance from anybody with
knowledge or = experience in correcting vibration issues such as the one = I
described=20 above

 

Thanks

 

Tom=20

 



----Forwarded Message----

From:=20 n20087@yahoo.com
To: n20087@yahoo.com
To:=20 n20087@yahoo.com
Sent: Thu May 19th, 2011 11:26 AM=20 EDT
Subject: LNC2 Vibration Issues

Folks

I am dealing with a vexing problem which has = plagued me=20 throughout my phase 1 testing and that is, I can=92t get rid of = vibration from=20 my engine prop combination.  I am running a Lycoming IO360/Slick = Mags=20 (non-counter weighted crank) with a new Hartzell HC-C2YK-1BF/F7666A. =

The prop was dynamically balanced on the ground = at 23=94 map=20 and 2400rpm to 0.05ips.  Interesting thing is the vibration = increases=20 significantly to 0.25ips at 2500RPM on the ground.  When flying, = I can=20 see the ASI needle vibrate a little (+/- 0.5mm) at high power settings = >19Inches and any RPM.    I have not been able to = measure=20 the vibration in the air since it is difficult to mount an = accelerometer in=20 the vertical plane under the cowl but I do see the stick vibrate a = little from=20 side to side when I let it go.

Some additional background:

1.      =20 The engine has accumulated 44 hours since new

2.      =20 The crank was dynamically balanced at the factory

3.      =20 When the engine was built it was tested with a club and = found to=20 be vibration free

4.      =20 The prop has a 4=94 extension by Sabre Industries

5.      =20 The balancing weight was mounted to the flywheel in the = form of=20 an AN3 bolt/nut (20 grams)

6.      =20 The spinner is solidly fixed to the prop and back plate = and is=20 centered

7.      =20 The crossover exhaust and tailpipes are fixed to the = engine=20 only

8.      =20 The cylinders are 9:1 compression

9.      =20 All cylinder compressions are even and in the 70s

10.   The = engine=20 mount bolts are torqued correctly to 40-45ftlb

11.   The = engine does=20 not/cannot touch the cowl

When I tested the aircraft at 17,500 feet, I = noted the=20 vibration was significantly less pronounced or non-existent due to the = low=20 power output.  I noticed the same thing in cruise decent at 18 = inches or=20 lower.  Talking to the prop balancing mechanic, he stated that it = is=20 unusual for balance to be ok at 2400 RPM but to be significantly = different at=20 2500RPM+. 

I would be very grateful for any help and = assistance from=20 anybody with knowledge or experience in correcting vibration issues = such as=20 the one I described above

 

Thanks

 

Tom

 

--
For archives and unsub=20 http://mail.lancaironline.net:81/lists/lml/List.html

No virus found in = this=20 message.
Checked by AVG - www.avg.com
Version: 10.0.1375 / = Virus=20 Database: 1509/3647 - Release Date: = 05/19/11

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