---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Wed 05/07/14: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:49 AM - Re: Vibrating control (Richard Goode) 2. 08:17 AM - Fuel shut off valve (CD610201@aol.com) 3. 08:29 AM - Re: Vibrating control (Walter Lannon) 4. 10:38 AM - Yak 54 SBs (Rotatohead) 5. 12:58 PM - Re: Vibrating control (Jacquescj6) 6. 07:17 PM - Re: Re: Vibrating control (Walter Lannon) ________________________________ Message 1 _____________________________________ Time: 12:49:34 AM PST US From: "Richard Goode" Subject: RE: Yak-List: Vibrating control The obvious question is whether you have dynamically balanced the propeller after changing it. We regard this as absolutely vital to smooth operation. Richard Goode Aerobatics Rhodds Farm Lyonshall Hereford HR5 3LW Tel: +44 (0) 1544 340120 Fax: +44 (0) 1544 340129 www.russianaeros.com -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Jacquescj6 Sent: 06 May 2014 22:32 Subject: Yak-List: Vibrating control Hi All I have just replaced an engine and prop in my cj6 and now have a bit of a vibration. On low Rpm it feels normal but at about 1200rpm there is a bit of vibration on the aircraft taxing at higher rpm about 1400 rpm it seem to go away. while flying there is a definite vibration on the stick. At low rpm 1700 to 1900 the vibration its not to bad and I would describe it as a slow vibration but as you increase the rpm the vibration speeds up quite a bit shaking the stick . It does not feel as if the air frame is shaking abnormally but only on the stick. Does anybody have a suggestion as to what it could be or is it just an unbalance prop. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=422929#422929 -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ________________________________ Message 2 _____________________________________ Time: 08:17:27 AM PST US From: CD610201@aol.com Subject: Yak-List: Fuel shut off valve Fuel shut off valve does not completely stop the flow of fuel on my Yak55M. When I took it apart there was a loose spring (not attached to anything) in the housing. Looks like it is there to spring load the flapper valve but not sure how it says in place. The flapper seal looks like it needs to be replaced. Anyone have any experience servicing this valve. Charles ________________________________ Message 3 _____________________________________ Time: 08:29:57 AM PST US From: "Walter Lannon" Subject: Re: Yak-List: Vibrating control A few questions on your prop installation; Was this a new prop. in 2 steel boxes from China. If so it would be perfectly balanced assuming you have set the blade angles correctly - with a propellor protractor, and properly positioned and torqued the clamps. While I agree with Richard about dynamic balancing that is a final step to match a properly balanced propellor with the rotating mass of the engine. Correct installation comes first. Please advise the details of the prop and engine you installed. Walt -----Original Message----- From: Jacquescj6 Sent: Tuesday, May 06, 2014 2:31 PM Subject: Yak-List: Vibrating control Hi All I have just replaced an engine and prop in my cj6 and now have a bit of a vibration. On low Rpm it feels normal but at about 1200rpm there is a bit of vibration on the aircraft taxing at higher rpm about 1400 rpm it seem to go away. while flying there is a definite vibration on the stick. At low rpm 1700 to 1900 the vibration its not to bad and I would describe it as a slow vibration but as you increase the rpm the vibration speeds up quite a bit shaking the stick . It does not feel as if the air frame is shaking abnormally but only on the stick. Does anybody have a suggestion as to what it could be or is it just an unbalance prop. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=422929#422929 ________________________________ Message 4 _____________________________________ Time: 10:38:12 AM PST US Subject: Yak-List: Yak 54 SBs From: "Rotatohead" Hello all! Looking for a complete list of issued SBs for the 54. Any help appreciated! Regards, Bernhard Read this topic online here: http://forums.matronics.com/viewtopic.php?p=422969#422969 ________________________________ Message 5 _____________________________________ Time: 12:58:06 PM PST US Subject: Yak-List: Re: Vibrating control From: "Jacquescj6" Hi Thanks for the reply's. It was used blades I got from the guy I bought the plane from After installing the blades we did discovered that the no 1 blade was a bit longer than the no 2 blade? I have taken them off and send them to our local propeller shop to do a static balance and then we will do a dynamic balance and see if it is better. Will let you guys know. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=422975#422975 ________________________________ Message 6 _____________________________________ Time: 07:17:01 PM PST US From: "Walter Lannon" Subject: Re: Yak-List: Re: Vibrating control You will need to send them the hub also. They will have to match the two blades in length, width and thickness before installing in the hub for both horizontal and vertical static balance. Unbalance correction is made with steel plates attached to the hub assy. After that it should be good assuming the blade angles are set within tolerance which is 0.1 deg (6 min.). I try to set them within 0.05 deg. (3 min.) Dynamic balance may not work very well on this prop. as there is no spinner structure. For dynamic balance the corrective weight could be required anywhere within 360 degs. With no spinner plate to accommodate that you are restricted to a limited area at each blade only. Walt -----Original Message----- From: Jacquescj6 Sent: Wednesday, May 07, 2014 12:56 PM Subject: Yak-List: Re: Vibrating control Hi Thanks for the reply's. It was used blades I got from the guy I bought the plane from After installing the blades we did discovered that the no 1 blade was a bit longer than the no 2 blade? I have taken them off and send them to our local propeller shop to do a static balance and then we will do a dynamic balance and see if it is better. Will let you guys know. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=422975#422975 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.