---------------------------------------------------------- Zenith701801-List Digest Archive --- Total Messages Posted Mon 05/16/11: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:05 AM - Re: 701 Streamlined Strut Covers (ruruny@aol.com) 2. 05:42 PM - Streamlined Strut Covers (Joe Spencer) 3. 06:46 PM - Re: Streamlined Strut Covers (NYTerminat@aol.com) 4. 06:50 PM - Re: Streamlined Strut Covers (MacDonald Doug) 5. 07:05 PM - Re: Streamlined Strut Covers (NYTerminat@aol.com) 6. 08:40 PM - Re: Windshield rubber channel (jf3sb) ________________________________ Message 1 _____________________________________ Time: 04:05:47 AM PST US Subject: Zenith701801-List: RE: 701 Streamlined Strut Covers From: ruruny@aol.com ....I have the 80hp Rotax with a three blade Warp Drive prop. The blades are 70 in diameter, have nickle leading edges and are set to ab out 8 deg. I'm cruising about 5200 RPM at an indicated 78 MPH. Full power cl imbout gives me about 5400 RPM and wide open straight and level gives me about 58 00 RPM. Doug, I have an 80 hp rotax 912, 68" warp drive prop 3 blade with no nickel lea ding edges. Originally the prop was 70" as I was planning on the 912s. When I got the 912 I called warp drive and they recommended the prop 68". I sent it back and they cut the blades down for $10 each. I originally set my prop pitch for 11.5 deg as this seemed the consensus for what most people were running but I could only get 4800rpm at full throttle climb. She clim bed ok but the cruise was awesome in the 90s. According to many on the rotax-list I was lugging engi ne. The next flights I decreased the pitch by 1 deg gaining 200 rpm on each adjustment but loosin g cruise performance. I ended up with 8.5 deg with 5700 climb and about 75mph cruise at 5200 rpm .. Brian ________________________________ Message 2 _____________________________________ Time: 05:42:28 PM PST US From: "Joe Spencer" Subject: Zenith701801-List: Streamlined Strut Covers >>>Any suggestions other than removing my slats? They are staying where they are. Doug MacDonald CH-701 from scratch NW Ontario, Canada Hi Bob The TAS of my plane increased 5 mph from adding the strut cuffs. The sink decreased and the climb increased also. I did numerous GPS box patterns under varying conditions over several days and finally averaged all the numbers for what should be an accurate real world speed. I never have been able to accurately judge a mod with just one or a few flights. I suppose one could actually decrease the speed of his plane with the addition of the cuffs. Or induce unwanted pitch or roll inputs. Not to overstate the obvious, but they have to be accurately aligned with the relative wind and one another for maximum benefit. I guessed at it and decided to use the top of the fuse for a reference and must have lucked out. I set the chord of the cuffs parallel with that reference and carefully aligned with one another(made a fixture for all that). Those cuffs would make fine trim tabs, able to affect roll and pitch and create considerable drag if not properly aligned . I didn't get any unwanted trim inputs. Maybe you did all that already; just food for thought... Good luck Joe in Mississippi ________________________________ Message 3 _____________________________________ Time: 06:46:31 PM PST US From: NYTerminat@aol.com Subject: Re: Zenith701801-List: Streamlined Strut Covers Doug, My 701 increased about 4 mph. I agree that the positioning of them is critical. What did you use to align the strut fairings? Bob Spudis N701ZX CH701 912S In a message dated 5/16/2011 8:42:37 P.M. Eastern Daylight Time, jpspencer@cableone.net writes: >>>Any suggestions other than removing my slats? They are staying where they are. Doug MacDonald CH-701 from scratch NW Ontario, Canada Hi Bob The TAS of my plane increased 5 mph from adding the strut cuffs. The sink decreased and the climb increased also. I did numerous GPS box patterns under varying conditions over several days and finally averaged all the numbers for what should be an accurate real world speed. I never have been able to accurately judge a mod with just one or a few flights. I suppose one could actually decrease the speed of his plane with the addition of the cuffs. Or induce unwanted pitch or roll inputs. Not to overstate the obvious, but they have to be accurately aligned with the relative wind and one another for maximum benefit. I guessed at it and decided to use the top of the fuse for a reference and must have lucked out. I set the chord of the cuffs parallel with that reference and carefully aligned with one another(made a fixture for all that). Those cuffs would make fine trim tabs, able to affect roll and pitch and create considerable drag if not properly aligned . I didn't get any unwanted trim inputs. Maybe you did all that already; just food for thought... Good luck Joe in Mississippi (http://www.matronics.com/Navigator?Zenith701801-List) (http://www.matronics.com/contribution) ________________________________ Message 4 _____________________________________ Time: 06:50:29 PM PST US From: MacDonald Doug Subject: Re: Zenith701801-List: Streamlined Strut Covers I was careful when aligning my streamlined covers. Their installation has had no negative effect on the control of the plane. I added one degree of pitch today, up to nine, that added about 1 MPH (as near as I can tell in the thermally air we had today). It reduced my T/O RPM by about 200 RPM to 5200. That is the minimum full power RPM recommended by Rotax. My full power, straight and level is now 5600 so I don't need to worry about overspeeding the engine. I don't know what effect this has had on my climb because of the thermals. I'm just going to have to accept that this plane is going to be an 80 mph aircraft. That's fine. It certainly is not the lightest example of a 701 with an empty weight of 667 lbs. Maybe I should loose 30 or so lbs and see what that does to my cruise. Thanks for all of your input guys. Doug MacDonald CH-701 from scratch NW Ontario, Canada ________________________________ From: Joe Spencer Sent: Mon, May 16, 2011 7:39:28 PM Subject: Zenith701801-List: Streamlined Strut Covers >>>Any suggestions other than removing my slats? They are staying where they >>are. Doug MacDonald CH-701 from scratch NW Ontario, Canada Hi Bob The TAS of my plane increased 5 mph from adding the strut cuffs. The sink decreased and the climb increased also. I did numerous GPS box patterns under varying conditions over several days and finally averaged all the numbers for what should be an accurate real world speed. I never have been able to accurately judge a mod with just one or a few flights. I suppose one could actually decrease the speed of his plane with the addition of the cuffs. Or induce unwanted pitch or roll inputs. Not to overstate the obvious, but they have to be accurately aligned with the relative wind and one another for maximum benefit. I guessed at it and decided to use the top of the fuse for a reference and must have lucked out. I set the chord of the cuffs parallel with that reference and carefully aligned with one another(made a fixture for all that). Those cuffs would make fine trim tabs, able to affect roll and pitch and create considerable drag if not properly aligned . I didn't get any unwanted trim inputs. Maybe you did all that already; just food for thought... Good luck Joe in Mississippi ________________________________ Message 5 _____________________________________ Time: 07:05:06 PM PST US From: NYTerminat@aol.com Subject: Re: Zenith701801-List: Streamlined Strut Covers Is there any way to change the angle of the strut covers? They may not have a negative effect but they are not reducing the drag on the round struts. I know what you mean about loosing weight:) I should also take that advice. Bob Spudis In a message dated 5/16/2011 9:50:45 P.M. Eastern Daylight Time, dougsnash@yahoo.com writes: I was careful when aligning my streamlined covers. Their installation has had no negative effect on the control of the plane. I added one degree of pitch today, up to nine, that added about 1 MPH (as near as I can tell in the thermally air we had today). It reduced my T/O RPM by about 200 RPM to 5200. That is the minimum full power RPM recommended by Rotax. My full power, straight and level is now 5600 so I don't need to worry about overspeeding the engine. I don't know what effect this has had on my climb because of the thermals. I'm just going to have to accept that this plane is going to be an 80 mph aircraft. That's fine. It certainly is not the lightest example of a 701 with an empty weight of 667 lbs. Maybe I should loose 30 or so lbs and see what that does to my cruise. Thanks for all of your input guys. Doug MacDonald CH-701 from scratch NW Ontario, Canada ____________________________________ From: Joe Spencer Sent: Mon, May 16, 2011 7:39:28 PM Subject: Zenith701801-List: Streamlined Strut Covers >>>Any suggestions other than removing my slats? They are staying where they are. Doug MacDonald CH-701 from scratch NW Ontario, Canada Hi Bob The TAS of my plane increased 5 mph from adding the strut cuffs. The sink decreased and the climb increased also. I did numerous GPS box patterns under varying conditions over several days and finally averaged all the numbers for what should be an accurate real world speed. I never have been able to accurately judge a mod with just one or a few flights. I suppose one could actually decrease the speed of his plane with the addition of the cuffs. Or induce unwanted pitch or roll inputs. Not to overstate the obvious, but they have to be accurately aligned with the relative wind and one another for maximum benefit. I guessed at it and decided to use the top of the fuse for a reference and must have lucked out. I set the chord of the cuffs parallel with that reference and carefully aligned with one another(made a fixture for all that). Those cuffs would make fine trim tabs, able to affect roll and pitch and create considerable drag if not properly aligned . I didn't get any unwanted trim inputs. Maybe you did all that already; just food for thought... Good luck Joe in Mississippi (http://www.matronics.com/Navigator?Zenith701801-List) (http://www.matronics.com/contribution) ________________________________ Message 6 _____________________________________ Time: 08:40:23 PM PST US Subject: Zenith701801-List: Re: Windshield rubber channel From: "jf3sb" I took a page from Bobkat's book and made a trim piece by laying up fiberglass around the joint between the windscreen and the glareshield/cowl/sides. I'll bridge the seam with vinyl striping tape, then cover it with the trim piece. Will be light, waterproof, and will look reasonably sharp too. Its a good way to go if you have the patience to mess with it. Otherwise, I'd tape it up and go flying... John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=340082#340082 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith701801-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith701801-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/zenith701801-list Browse Digests http://www.matronics.com/digest/zenith701801-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.