---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Mon 03/21/16: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:07 AM - Re: rotax vacuum pump query (Rowland Carson) 2. 03:19 PM - Re: Re: Arplast news (Ken Atkinson) ________________________________ Message 1 _____________________________________ Time: 03:07:17 AM PST US Subject: Re: Europa-List: rotax vacuum pump query From: Rowland Carson On 2016-03-20, at 23:42, Robert Borger wrote: > How about pulling off the spacer plate and using it as a pattern to make a solid plate of the same size and similar thickness with the same bolt holes. Then make a thin gasket to go between. You can use the cover and gasket over the spacer to close up the area. It would look nice and neat and keep crud out of the works. On 2016-03-20, at 23:43, Tim Ward wrote: > I removed my Vacuum Pump for a glass screen Instrument Panel last year. > What I did and as you say, > "Add another little piece of aluminium plate thick enough to allow the nuts to be done up." > I sealed it with a gasket sealant and it covered the Vacuum Drive slot. Bob, Tim - thanks for the reassurance - Ill go ahead with plan A. in friendship Rowland | Rowland Carson ... that's Rowland with a 'w' ... | http://www.rowlandcarson.org.uk | Skype, Twitter: rowland_carson Facebook: Rowland Carson | pictures: http://picasaweb.google.com/rowlandcarson ________________________________ Message 2 _____________________________________ Time: 03:19:07 PM PST US Subject: Re: Europa-List: Re: Arplast news From: Ken Atkinson Hi Jon, I have the Arplast and have had some vibration issues that sound similar to your own. I have found some wear in the small square nylon blocks and also in the brass 6 mm actuator screw. I am monitoring this and would like to renew these items. Probably, I could make them ,but would prefer to obtain some correct specification replacements. The shouldered allen screws holding the nylon blocks are peened over in the clamped collar and, therefore would require machining out to release them. Correct spec. replacements would be required. The 6mm brass screw would be fairly easy to manufacture but is pinned into the drive dog and could be a bit fiddly to carry out. I wonder if the new people may also supply the above items? Cheers Ken. G-CEKV KIT 19 370 hrs On 09/03/2016 21:53, italianjon wrote: > > Hi Pete, > > Trust you're well. > > I don't need blades, I think :? > > I am still trying to track down this vibration issue, progress has been slow over the last few months due to work pressures taking all of my time. Anyway, the gearbox work has, so far, not revealed anything obvious. > > There is one point of concern on the propeller though. If I pull blades 1 and 3 outwards with a moderate force and try and twist the blade there is no play - it is rigid. But on blade 2 there is a bit of play which I estimate could alter the blade pitch by 3 to 4 degrees. It seems to be a worn plastic block, that sits in the swash plate. I even think you mentioned it when you had a look at the propeller. At that time you noticed it and said it looked OK. But I think it's worse now. If I recall, when we assembled it at yours, there was hardly any play. I also think the vibration could be a little worse now as well, but still not detectable by me sitting in the plane while on the ground. It does appear when airborne, even one single circuit. I am trying to understand what the different effects of a stationary, but spinning prop, and an airborne prop, at velocity are; and if that could give me a clue. > > I am also trying to borrow a few vibration sensors from work to give me some data to look at, instead of using Mk 1 eyeball :D > > The swash plates sits about half way up the plastic block, and you can see evidence of wear/pressure on the plastic, which leads to a gap between the surface that is not contacting the swash plate, and the swash plate itself. It is about 0.2 to 0.3mm. > > I have checked the blade track and that is almost perfect. It's less than 1mm total deviation. > > So my thoughts are starting to think about a single blade flutter. > > It appears that if I could hold of a single set of dogs, or set of plastic blocks, to replace the ones on blade 2, I could take up the play to the swash plate. Then see if that works, by removing this pay on blade 2. > > I didn't have my camera with me on Sunday, but I was going to video it and send it to you and ask what you though. > > Best > > Jon > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=453608#453608 > > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-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/europa-list Browse Digests http://www.matronics.com/digest/europa-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.