---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Sun 05/27/07: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:54 AM - Re: propeller optimization (rampil) 2. 07:54 AM - Re: propeller optimization (rampil) 3. 12:37 PM - Re:propeller optimization (dmac11@telus.net) 4. 03:41 PM - Re: Re:propeller optimization (Fred Klein) 5. 04:35 PM - Re: Re:propeller optimization (Graham Singleton) 6. 05:43 PM - Re: propeller optimization (rampil) 7. 10:54 PM - Re: Re: propeller optimization (Fred Klein) ________________________________ Message 1 _____________________________________ Time: 07:54:29 AM PST US Subject: Europa-List: Re: propeller optimization From: "rampil" Dwayne, When you mention the gear ratio of the 912, you are talking about the 80 HP engine right? The 912S and 912ULS use 1:243 Ira N224XS -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=115055#115055 ________________________________ Message 2 _____________________________________ Time: 07:54:29 AM PST US Subject: Europa-List: Re: propeller optimization From: "rampil" of course there is a decimal point in the 2.43 -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=115056#115056 ________________________________ Message 3 _____________________________________ Time: 12:37:42 PM PST US From: dmac11@telus.net Subject: Europa-List: re:propeller optimization Yes Ira the 912 80 hp version comes with 2.27:1 gear ratio, @ 5800 rpm, prop will be 2555 rpm, 912s & 914 use 2.43:1 ratio @ 5800 rpm, prop will be 2386 rpm. Regards, Dwayne ________________________________ Message 4 _____________________________________ Time: 03:41:01 PM PST US Subject: Re: Europa-List: re:propeller optimization From: Fred Klein Those concerned w/ this topic would be well to question the basic performance of the Warp Drive blades. In a series of emails I exchanged w/ Airmaster some time ago, they concede that the shortened blades needed for the Europa and given the speed ranges in which it flies, these blades leave much to be desired. Fred A194 ...hoping to trial fit wings to CM next week...sigh... -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ________________________________ Message 5 _____________________________________ Time: 04:35:51 PM PST US From: Graham Singleton Subject: Re: Europa-List: re:propeller optimization Fred Good point. I spoke to the Airmaster guys a few years ago and they told me they spent a lot of time looking for the right blades. Warp were far from ideal, the design of the prop was for ragwing microlights, but nobody else was cooperative. Sad, Arplast would have been ideal but the chemistry didn't work so both Arplast and Airmaster lost out. Alain Petit, the Arplast boss is a nice guy but his English isn't confident and I don't suppose the NZ guys speak much French. What an opportunity missed. Wish I had been in the right place a few years earlier! Graham Fred Klein wrote: > > Those concerned w/ this topic would be well to question the basic > performance of the Warp Drive blades. In a series of emails I exchanged > w/ Airmaster some time ago, they concede that the shortened blades > needed for the Europa and given the speed ranges in which it flies, > these blades leave much to be desired. > > Fred ________________________________ Message 6 _____________________________________ Time: 05:43:55 PM PST US Subject: Europa-List: Re: propeller optimization From: "rampil" The short prop blades are really only for monowheel a/c. When I ordered my Airmaster system for my trigear, I asked for the blades to each be 2" longer than the "standard Europa" i.e., monowheel spec. It was actually a no-charge ECO since the stock blades are longer still. Ira N224XS -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=115109#115109 ________________________________ Message 7 _____________________________________ Time: 10:54:30 PM PST US Subject: Re: Europa-List: Re: propeller optimization From: Fred Klein On Sunday, May 27, 2007, at 05:42 PM, rampil wrote: > > The short prop blades are really only for monowheel a/c. > When I ordered my Airmaster system for my trigear, I asked for the > blades to each be 2" longer than the "standard Europa" i.e., monowheel > spec. This is of course a step in the right direction; the fan area that a prop generates is one of several important factors in prop performance. As Ira says, the Warp Drive blades all come from one mold and are simply cut down appropriately to serve various aircraft. One problem as I understand it is that much of the twist in the WD blades disappears when the diameter is reduced. Another is that since the blade was designed for a lower speed range (and perhaps lower rpm at cruise) than the Europa flies in, at higher speeds the innermost portions of the blade actually generates negative thrust due to the configuration of the blade cross section. Both of these issues were raised to me by guys who know a lot more about props than I do and warrant some consideration. Airmaster confirmed to me as Graham states that the WD was simply the best available choice... Fred -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ------------------------------------------------------------------------------------- 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.