---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Fri 06/19/20: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:29 AM - Re: Propeller? Gearbox? "Wow-wow-wow" resonance (Remi Guerner) 2. 04:14 AM - Biax Material for Europa classic wing (TobiK) 3. 04:40 AM - West Systems for wing filling ?? (Tony Renshaw) 4. 05:12 AM - Re: Propeller? Gearbox? "Wow-wow-wow" resonance (SPURPURA) 5. 05:43 AM - Re: Biax Material for Europa classic wing (spcialeffects) 6. 05:45 AM - Re: West Systems for wing filling ?? (spcialeffects) 7. 06:58 AM - Re: Propeller? Gearbox? "Wow-wow-wow" resonance (clivesutton) ________________________________ Message 1 _____________________________________ Time: 12:29:45 AM PST US Subject: Europa-List: Re: Propeller? Gearbox? "Wow-wow-wow" resonance From: "Remi Guerner" Jonathan, I do not think your gearbox could cause your problem. The cause may be a bug in the propeller controller. I would ask Airmaster for advice. Good luck Remi Read this topic online here: http://forums.matronics.com/viewtopic.php?p=496919#496919 ________________________________ Message 2 _____________________________________ Time: 04:14:40 AM PST US Subject: Europa-List: Biax Material for Europa classic wing From: "TobiK" Hey Guys, I am actually building an Europa classic (blue foam) Wing. I am running out of material (biax cloth) and I would now like to buy some new. The problem is, I don't know what material the "biax" is. Does anyone of you can help me with a specification or typ of cloth? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=496922#496922 ________________________________ Message 3 _____________________________________ Time: 04:40:55 AM PST US From: Tony Renshaw Subject: Europa-List: West Systems for wing filling ?? Gidday, Over time I have found exposure to Ampreg products gave me flu type symptoms for a couple of days after use, so I have migrated to the West Systems 105/106 Resin/Hardner combination, with far less issues. I am wondering if others have used it for filling their aircraft, whether it sands well, or whether I should consider something else? I think at this stage Ill keep to an epoxy based filler, unless I get a compelling argument to use something else. Hoping to get some pearls of wisdom.... thanks in advance. Regards Tony Renshaw ________________________________ Message 4 _____________________________________ Time: 05:12:40 AM PST US Subject: Europa-List: Re: Propeller? Gearbox? "Wow-wow-wow" resonance From: "SPURPURA" Doubt that its propeller related. Try a stethoscope. If you have 600 hours on it, you may be ready for some gear box service. I had 700 hours on mine before getting rebuilt.Dont let it go too long as it is full of expensive parts. -------- N951EU - Tri-gear & 912ULS, N77EU- Mono & 914 I'D RATHER HAVE A BOTTLE IN FRONT OF ME THAN A FRONTAL LABOTAMY. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=496924#496924 ________________________________ Message 5 _____________________________________ Time: 05:43:08 AM PST US Subject: Europa-List: Re: Biax Material for Europa classic wing From: "spcialeffects" Hi TobiK. I too built a classic but didn't have the biax cloth. I spoke with Andy D and he told me the very early kits (first 12 or so) used 2 layers of uni. When i was looking for the Biax cloth ito couldn't get the exact specs not even from the LAA. Good Luck Read this topic online here: http://forums.matronics.com/viewtopic.php?p=496926#496926 ________________________________ Message 6 _____________________________________ Time: 05:45:02 AM PST US Subject: Europa-List: Re: West Systems for wing filling ?? From: "spcialeffects" Yes i to used the west system for the filling stage on the recommendation from Neville E, It sands much better then the ampreg. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=496927#496927 ________________________________ Message 7 _____________________________________ Time: 06:58:51 AM PST US Subject: Europa-List: Re: Propeller? Gearbox? "Wow-wow-wow" resonance From: "clivesutton" Hi Jonathan, what you describe is 'Heterodyning' or 'Beat-frequency' created by the difference between two noise or vibration frequencies very close together. Do you have a recording on e.g. a mobile phone that i could listen to - along with the engine speeds in play at the time? And what about:- 1) How the frequency of 'wow-wow' change if you speed up or slow down the engine a bit? 2) How does the 'wow-wow' effect change with Airspeed? 3) the CS mode idea is viable too - does it occur when that is turned off/the prop is not trying to hunt for optimum speed vs pitch? It's impossible to say from just the description given, but assuming the above items make a significant difference, my initial suspicions would be one prop blade with a slightly different prop pitch to the others and/or blade tip tracking differences between blades. Both of those parameters should be quite easy to check on the ground (no engine running needed) and reporting any variation you find? Clive Read this topic online here: http://forums.matronics.com/viewtopic.php?p=496930#496930 ------------------------------------------------------------------------------------- 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.