---------------------------------------------------------- Zenith701801-List Digest Archive --- Total Messages Posted Mon 09/29/08: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:18 AM - Re: BRS balance issue (carl) 2. 06:29 AM - Chat Room Reminder (George Race) 3. 06:48 AM - Another BRS data point (george.mueller@aurora.org) 4. 08:35 AM - Re: BRS & CG (Zed Smith) 5. 09:06 AM - Re: CH701 Wing Leveler (Geoff Heap) 6. 11:07 AM - Re: Re: CH701 Wing Leveler (Les Goldner) 7. 08:33 PM - CH701 with Jabiru 2200 (Chuck Deiterich) 8. 09:18 PM - Re: CH701 with Jabiru 2200 (Graeme) ________________________________ Message 1 _____________________________________ Time: 05:18:09 AM PST US From: "carl" Subject: Re: Zenith701801-List: BRS balance issue Enjoyed the discussion of CofG factors affecting the flying characteristics of the 701. I suggest that one important factor was not mentioned, the vertical position in the fuselage of the weight change. A/C are usually weighed in the level flight position to measure the CofG. Tipping the a/c away from the level position will result in a different CofG position. In the 701 it will generally move forward (stabilizing) if the vertical position of the added weight is low on the fuselage and rearward (destabilizing) if high. The position of a BRS chute if high in the fuselage would be destabilizing and therefore flight testing for CofG should be approached with due caution. Another change that could be destabilizing is addition of larger fuel tanks in the wings. These tend to be extended chordwise moving the CofG rearward. Because of the high wing, when the angle of attack is increased, the weight of the fuel and tank shifts rearwards, in addition if the tanks are not full the fuel flows to the back of the tank giving a double whammy to the CofG. This factor is further accentuated in the 701 because it can achieve angles of attack well above 20' before stall. I agree that the affect on the CofG of any changes should be carefully measured on the ground and deviations from the norm corrected and assed before start of flight testing. One good rule is to fast taxi and try to rotate the nose to get a feel for elevator response before going airborne. During flight testing I always make sure I get a good positive increase in stick back pressure with decreasing speed right up to the wing stall. Any levelling of back pressure before the stall is a danger signal that the CofG is too far back. 30 hrs this summer, trying for 40 before freez-up. Carl ________________________________ Message 2 _____________________________________ Time: 06:29:40 AM PST US From: "George Race" Subject: Zenith701801-List: Chat Room Reminder Please join us for our Monday evening chat room starting around 8:00 PM Eastern Time. http://www.mykitairplane.com/chat/ George CH-701 - N73EX - IT FLYS! Do Not Archive ________________________________ Message 3 _____________________________________ Time: 06:48:28 AM PST US Subject: Zenith701801-List: Another BRS data point From: george.mueller@aurora.org Regarding the discussions about the BRS, I have a 701 with the skyshops FWF kit and a Rotax 912ul. I installed the BRS per the BRS drawing on the rear wall of the baggage compartment. My GC came out more aft than forward (I think around 400), but within limits, and the airplane flys fine. I also have "X" bracing in the fuselage. One consideration I had about the BRS is what would happen in a "normal" crash, would the g forces cause the BRS to hit me in the head? I put heavy cargo netting in the baggage compartment to contain the BRS. Les's installation on the back wall of the baggage compartment would be an even better solution to this problem, however you must be more careful about an aft CG problem putting the BRS further back. George in Milwaukee N701GM 49 hours flying ________________________________ Message 4 _____________________________________ Time: 08:35:39 AM PST US From: Zed Smith Subject: Zenith701801-List: Re: BRS & CG George, You say your CG was more toward aft, but within limits. I'm wondering if you happened to do another set of weighings with a person (or sandbags) in the pilot seat? This probably would move the "in flight" CG fwd a bit, but still within limits. Might be interesting to see, if you still have the scales available. Regards, Zed 701/R912/90%/several years/etc ________________________________ Message 5 _____________________________________ Time: 09:06:00 AM PST US Subject: Zenith701801-List: Re: CH701 Wing Leveler From: "Geoff Heap" Les/Kieth With your knowledge of the install. How difficult would this be as a retro fit as opposed to a original install? I'm not finished yet and could do it now or start flying first. do you recall the cost? thanks.... Geoff Read this topic online here: http://forums.matronics.com/viewtopic.php?p 6758#206758 ________________________________ Message 6 _____________________________________ Time: 11:07:08 AM PST US From: "Les Goldner" Subject: RE: Zenith701801-List: Re: CH701 Wing Leveler Geoff, Almost all wing levelers are retrofits. I have attached a picture of the servo installation from Trio (EZ) so you can see how easy it is to install. This pic shows two servos but for wing leveling you only need the gray one. It took me about 1/2 day to install (and I'm slow). The biggest part is attaching the wires. I added a kill/set switch on my control stick. Les > -----Original Message----- > From: owner-zenith701801-list-server@matronics.com > [mailto:owner-zenith701801-list-server@matronics.com] On > Behalf Of Geoff Heap > Sent: Monday, September 29, 2008 9:05 AM > To: zenith701801-list@matronics.com > Subject: Zenith701801-List: Re: CH701 Wing Leveler > > --> > > Les/Kieth > With your knowledge of the install. How difficult would this > be as a retro fit as opposed to a original install? I'm not > finished yet and could do it now or start flying first. do > you recall the cost? thanks.... Geoff > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p 6758#206758 > > > > > > > > Photoshare, and much much more: > > > ________________________________ Message 7 _____________________________________ Time: 08:33:47 PM PST US From: "Chuck Deiterich" Subject: Zenith701801-List: CH701 with Jabiru 2200 The following statement was taken from "STOL Updates from Zenith Aircraft Co." e-mail I received today: "What made this CH 701 unique was the installed powerplant: a Jabiru 2200...." It is not clear to me what is so unique, as I and others have been flying our CH 701s behind a Jabiru 2200 since 2002. In fact, you can see my CH 701 on ZAC's web site with the note it has a 2200. Chuck D. N701TX ________________________________ Message 8 _____________________________________ Time: 09:18:42 PM PST US From: "Graeme" Subject: Re: Zenith701801-List: CH701 with Jabiru 2200 English is a funny language they could have said differant. But then again all Ch701s are unique as no two will probably be identical ;-) ----- Original Message ----- From: Chuck Deiterich To: zenith701801-list@matronics.com Sent: Tuesday, September 30, 2008 1:29 PM Subject: Zenith701801-List: CH701 with Jabiru 2200 The following statement was taken from "STOL Updates from Zenith Aircraft Co." e-mail I received today: "What made this CH 701 unique was the installed powerplant: a Jabiru 2200...." It is not clear to me what is so unique, as I and others have been flying our CH 701s behind a Jabiru 2200 since 2002. In fact, you can see my CH 701 on ZAC's web site with the note it has a 2200. Chuck D. N701TX ------------------------------------------------------------------------- ----- Checked by AVG - http://www.avg.com 9/29/2008 7:25 PM ------------------------------------------------------------------------------------- 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.