Date
21 - 27 of 27
Flight characteristics questions
Allan Farr <afarr@...>
Will do - I'll let you know when it's done, probably next week before I can get hold of a camera.
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Allan ----- Original Message -----
From: Doug Humble To: Q-LIST@... Sent: Thursday, 19 October 2006 10:45 Subject: Re: [Q-LIST] Flight characteristics questions Allen - can you take some photos and post them to the photos folder? Doug "Hawkeye" Humble A Sign Above www.asignabove.net Omaha NE N25974 ----- Original Message ----- From: Allan Farr To: Q-LIST@... Sent: Wednesday, October 18, 2006 4:39 PM Subject: Re: [Q-LIST] Flight characteristics questions David, The elevators on my GU canard appeared to me to have been put on upside down by the original builder as the trailing edge curved up. I have gone to alot of trouble flipping them over so that the t/e curves down - do you think I should have left them as is? Allan Farr Q2 P.S. On fast taxi runs with the elevators as they were (t/e curved up), the canard didn't want to fly. I need all the lift I can get up front, and that is one reason why I flipped the elevators over. ----- Original Message ----- From: david@... To: Q-LIST@... Sent: Wednesday, 18 October 2006 13:11 Subject: Re: [Q-LIST] Flight characteristics questions Paul, Not underneath. On top. It is UNdesirable to have undercambered elevators on canards. It IS desireable to have a slight REFLEX (reverse camber near the trailing edge) on the elevators of canard airplanes. This is one distinct reason that the choice of the LS(1)-0417MOD airfoil was such a POOR CHOICE for a canard airfoil, despite the fact that it has been made to work. IIRC, the LS(1) canard was rumored to be the breaking point between Rutan and the rest of QAC. David J. Gall ----Original Message---- From: paulbuckley@... Date: Oct 17, 2006 13:28 To: <Q-LIST@...> Subj: Re: [Q-LIST] Flight characteristics questions Dave As a matter of interest, an old method of achieving trim was to 'dope' a length of string along the airfoil trailing edge, varying the length to achieve the desired effect. Do you think that this method could be used underneath the GU elevators as an alternative to camber, if only as a temporary explorative measure? Paul Buckley Cheshire England |
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Allan Farr <afarr@...>
From what I understand it depends on how much filler is used on the glass-to-glass join at the trailing edge. If none is used, there is quite a lip. However even allowing for that, my elevators may not have been constructed totally accurately as otherwise flipping them over would have been a lot easier.
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AF ----- Original Message -----
From: David J. Gall To: Q-LIST@... Sent: Thursday, 19 October 2006 11:05 Subject: RE: [Q-LIST] Flight characteristics questions Allan, I don't think there's supposed to be any curve at all in the GU elevators. My plans don't show any. David J. Gall > -----Original Message----- > From: Q-LIST@... [mailto:Q-LIST@...] > On Behalf Of Allan Farr > Sent: Wednesday, October 18, 2006 2:40 PM > To: Q-LIST@... > Subject: Re: [Q-LIST] Flight characteristics questions > > David, > The elevators on my GU canard appeared to me to have been put > on upside down by the original builder as the trailing edge > curved up. I have gone to alot of trouble flipping them over > so that the t/e curves down - do you think I should have left > them as is? > Allan Farr > Q2 > P.S. On fast taxi runs with the elevators as they were (t/e > curved up), the canard didn't want to fly. I need all the > lift I can get up front, and that is one reason why I flipped > the elevators over. |
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njepsen@ihug.co.nz <njepsen@...>
Allan
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I have sent you a few pix of your Q2 showing a side view. I'll do a CD of all the Pix I have of your A/C and post iot to you. Send me your address again. neil Allan Farr wrote: Will do - I'll let you know when it's done, probably next week before I can get hold of a camera. |
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MartinErni@...
Jeff,
Not all Q's are like the one described that would not lift a wing with rudder. My plane easily lifts a wing with rudder. When I want to fold a map I get on the rudder so my hands are free. A few years back, before I put my pitch trim switch on the stick, I flew it for 30 minutes without touching the stick using pitch trim and rudder. That was on an average summer day with average turbulence. I could have done it all day but 30 minutes gave me the info I wanted. I don't know if not having anhedral on the canard makes a difference or not. Maybe anhedral on the canard partially cancels the dihedral of the wing. It's amazing how many differences we find in the same design with different builders. Earnest Triq200 960 hrs |
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Letempt, Jeffrey MR <jeffrey.letempt@...>
It is interesting to discover differences in the Q and Dragonfly as these
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discussions come up. The Dragonfly's rudder is very effective, in fact the rudder is way more effective than the ailerons in rolling my Dragonfly....of course the Dragonfly probably has twice the rudder area. As the airspeed builds in the Dragonfly the aileron controls forces get very heavy, this is a problem that the Q does not seem to have. Lots of Dragonfly's have aileron servo tabs to reduce the aileron stick pressure. Like Jim's experience, my Dragonfly is more pitch sensitive with an aft CG. I have adjustable sparrow strainers on my Dragonfly (GU canard) and a simple 2 spring elevator trim system. If I run out of up elevator trim I need to put more AOA in the sparrow strainers. The faster the airspeed the more the elevator wants to come up. Using a digital level; with the upper surface of the elevator at 45 degrees down (not travel, just the static position) the upper surface of my sparrow strainers are at 38 degrees down. A 2-3 degree adjustment of the sparrow strainers makes a significant difference, in fact I have been able to correct for a slight roll tendency with one sparrow strainer that is set ever so slightly different that the other one. This sparrow strainer setting works for my current cruise airspeed of about 140 MPH. My elevator trim system does not have a wide adjustment range and I have found that the 5-7 MPH airspeed difference with my wheel pants requires a sparrow strainer adjustment. I can adjust for hands-off with the reflexor if I run out of elevator trim, but the elevator will not be in trail. I can either install larger springs, install a different trim system that has more travel, or make minor sparrow strainer adjustments when I make aerodynamic adjustments that will effect my cruise airspeed. I will probably opt for the minor sparrow strainer adjustments, but a trim system with more range is the right answer (and there are even plans in an old Dragonfly newsletter)....maybe I am getting lazy. I know very little of this information could be directly applied to a Q, but you never know. Obviously you should listen to what the experienced Q guys have to say. Good luck. Jeff -----Original Message-----
From: Q-LIST@... To: Q-LIST@... Sent: 10/16/2006 7:12 PM Subject: [Q-LIST] Re: Flight characteristics questions TIM, FIRST CONGRATULATIONS ON YOUR 62 HOURS FLIGHT TIME IN A Q. YOU'VE JOINED A UNIQUE CLUB. --- In Q-LIST@yahoogroups. <mailto:Q-LIST%40yahoogroups.com> com, "q2fun" <q2fun@...> wrote: 2. Pitch sensitivity. With an after c/g my Q2 seams pitchsensitive. My Q2 has the LS1 canard, Revmaster 65hp, tail dragger. Is itABSOLUTELY! FAR AFT CG IS NOT A GOOD PLACE TO BE IN THIS PLANE. up, all that happens is the plane will yaw and the bank may even getMAYBE. IN LEVEL FLIGHT, PUSHING THE RUDDER WILL DEFINATELY YAW THE TAIL BUT I HAVEN'T NOTICE THE BANK INCREASING. IN SLIGHT BANKS MINE WILL RECOVER USING THE RUDDER ONLY. I THINK THE SMALL RUDDER ON THESE PLANES DOES A GOOD JOB BUT RECOVERING FROM A BANK SOLELY USING RUDDER .......NOT SO GOOD. I WILL CHECK IT OUT WHEN I FLY AGAIN. I CRUISED MY Q200 (LS1)SATURDAY FROM 130 TO 185K AND DID NOT NOTICE ANY TUCKING OR PITCHING. I ALSO HAVE A STANDARD TRIM SYSTEM. MAYBE YOUR STRAINERS ARE INSTALLED INCORRECT. It is a joy to blast around the pattern and it is even a joy to putgas in it after a long cross county. It is just a little too slow inYOU CAN FIX THAT! TIM WE SEE 160-165K CRUISE STANDARD WITH PUMPED 0200'S (TAIL DRAGGER VERSION). JUST COSTS A LITTLE $$$$$$$. REGARDS, JIM PATILLO
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Paul Buckley
Hi Tim
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As a matter of interest, all aircraft become increasingly pitch sensitive as the C of G travels aft, that is why there is an aft limit. There is a safety factor built in, of course, but, generally speaking, to be behind that limit is dangerous. The further forward the C of G is, the more pitch stable the aircraft is, at the expense of elevator authority, which is why there is a forward limit. Would I be correct in thinking that you do not have any sparrow strainers installed? Regards Paul Buckley Cheshire England. TriQ200....still building. ----- Original Message -----
From: q2fun To: Q-LIST@... Sent: Tuesday, October 17, 2006 12:27 AM Subject: [Q-LIST] Flight characteristics questions Hi All, I have some questions about the flight characteristics of the Q-2. Pitch sensitivity. With an after c/g my Q2 seams pitch sensitive. My Q2 has the LS1 canard, Revmaster 65hp, tail dragger. Is it normal to get more pitch sensitive the more aft the C/G gets? Rudder to control bank. My rudder does not do anything for bank. If the wing is down 5 degrees and you use the rudder to bring it up, all that happens is the plane will yaw and the bank may even get steeper. Is that a normal characteristic of the Q design? With an increase in airspeed above 150 mph indicated the airplane wants to pitch down and farther increase airspeed/pitch down harder. Is this normal? Sparrow strainers to small for this airspeed? I have the standard pitch trim system. I have been flying my Q since April and now have 62 hours in it. It is a joy to blast around the pattern and it is even a joy to put gas in it after a long cross county. It is just a little too slow in cruise 130 kts. Thank You All. Tim Bryant KUNV N86TB ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.4/476 - Release Date: 14/10/2006 |
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Dave Richardson <dave@...>
Hi Tim,
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I tested your rudder during bank question this past weekend in my Tri-Q2 with an LS1 canard with anhedral and standard rudder. I was doing laps around the pattern and building up landings and remembered your post. So while banking to the left on crosswind to downwind, I applied right rudder and the plane leveled off to the right as you were expecting. I did it twice to make sure of the results. I did not get the sense that I was yawing. It felt more like I had used the ailerons to roll out. I hope that was the feedback you were looking for. I know Earnest reported similar results as well. Maybe you've got one of those dad'burn rudders that are too big! <grin> All kidding aside, something must be up for you to get the results you are describing. I don't recall consciously using the rudder like that in a bank before. It makes all the more sense now why the instructors harp on it so much to fly coordinated especially in a bank and not be lazy on the rudders. I was talking with Earnest about rudders at Emporia and how I noticed during the ride out that it seems like you always have to keep an eye on the ball. Any change in pitch or roll or throttle you make seems to result in the ball being off center. One thing I also noticed was how easy it was to hear when the ball was off center. I'm guessing it was the sound of the air rushing in the NACA vents that I was noticing that changed in intensity when I would be even slightly slipping or skidding. The rudder on this plane seems like it is a one legged stool where you just can't set and forget but you always have to keep on top of it. Good luck tracking down your problems. Dave Richardson Tri-Q2 825DR -----Original Message-----
From: q2fun Sent: Mon 10/16/2006 7:27 PM To: Q-LIST@... Cc: Subject: [Q-LIST] Flight characteristics questions Hi All, Rudder to control bank. My rudder does not do anything for bank. If the wing is down 5 degrees and you use the rudder to bring it up, all that happens is the plane will yaw and the bank may even get steeper. Is that a normal characteristic of the Q design? Thank You All. Tim Bryant KUNV N86TB |
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