---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Fri 05/25/07: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:43 AM - Re: trailer wing support profile. (Keith Hickling) 2. 11:33 AM - propeller optimization (Dwayne McAllister) 3. 12:26 PM - Re: propeller optimization (Jerry Rehn) ________________________________ Message 1 _____________________________________ Time: 01:43:26 AM PST US From: Keith Hickling Subject: Re: Europa-List: trailer wing support profile. Many thanks Roddy, I had considered this, but it's good to hear it worked well. I'll think about which way to go. Regards, Keith. ----- Original Message ----- From: RoddyEuropa@aol.com To: europa-list@matronics.com Sent: Friday, May 25, 2007 8:14 AM Subject: Re: Europa-List: trailer wing support profile. In a message dated 22/05/2007 09:12:20 GMT Standard Time, keithhickling@clear.net.nz writes: Does anyone have a wing profile forward of the spar at the position of the wing support on the factory trailer? On my drawing this is 2 metres from the root spar pin bush. If anyone has one they could email or post to me I would be very grateful and it would save a lot of work trying to transcribe it from the wing. I need it to get the trailer wing supports made. Keith Hickling, New Zealand. I have made trailer supports for the outboard part of the wing by moulding directly over the finished wing - so you get a snug fit. What I did was put the wing leading edge up, cover it in a polythene sheet, then stretched some thick foam (a camping sleep mat) over the leading edge, and then laid up several layers of glassfibre over that, about 10 inches wide, and about 16 inches back each side from the leading edge. Once set, I removed it, trimmed it, cut it into two bits 5 inches wide, and this then formed a perfectly shaped insert to go into the trailer U shaped bracket. Then, put the wings on the trailer with the new inserts loosley in place, and then glassed these into place on the trailer. So, I ended up with a wing support that exactly matched the wing profile. I have used it once, about 10 miles, and the signs are that it works far better than the sling as supplied with the trailer. Roddy Kesterton europa 220 ________________________________ Message 2 _____________________________________ Time: 11:33:41 AM PST US From: "Dwayne McAllister" Subject: Europa-List: propeller optimization I spoke with a gent at Warp Drive who explained that with the short blade's used on the europa, the blade pitch angle needed for higher speeds can be greater than optimal causing turbulance near the tips. He told me they can modify the blade near the tips to alleviate this problem and pick up 5 or 10 kts. He also said it would be better for the europa if one used the 912 gear ratio (2.27:1) rather than the 914( 2.43:1). Has anyone tried the constantspeed blade planeform from Warp Drive? or used the 912 gear ratio on the 914? if so was performance improved? Dwayne McAllister dmac11(at)telus.net ________________________________ Message 3 _____________________________________ Time: 12:26:34 PM PST US From: "Jerry Rehn" Subject: RE: Europa-List: propeller optimization Dwayne I would talk to the folks at Airmaster; they did extensive testing for their prop using the Europa as the test platform! They seem like pretty smart folks and worked with Warp Drive during the development. The Mono wheel may have some blade length compromises due to the ground clearance but I don't know. I don't think Rotax would recommend switching gears around between 912 and 914. I sure like my Airmaster, its worked great for 6 years. Jerry _____ From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Dwayne McAllister Sent: Friday, May 25, 2007 11:32 AM Subject: Europa-List: propeller optimization I spoke with a gent at Warp Drive who explained that with the short blade's used on the europa, the blade pitch angle needed for higher speeds can be greater than optimal causing turbulance near the tips. He told me they can modify the blade near the tips to alleviate this problem and pick up 5 or 10 kts. He also said it would be better for the europa if one used the 912 gear ratio (2.27:1) rather than the 914( 2.43:1). Has anyone tried the constantspeed blade planeform from Warp Drive? or used the 912 gear ratio on the 914? if so was performance improved? Dwayne McAllister dmac11(at)telus.net ------------------------------------------------------------------------------------- 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.