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Quickie Q-2 Never Exceed speed
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Jeff Sellars
Hello everyone, I am a new owner of a quickie Q-2 and it may be another few weeks until I fly my bird for the first time.
I have two questions at the moment. Has anyone ever tested the true never exceed speed? In my opinion, by the looks of things, this bird can handle a much higher speed than 200 MPH before coming apart, or damage. I am a 20 year private pilot, A&P mechanic and studied planes my whole life, as well as, I built a few too. But I could be off with this one, so I wanted advice. When do I really need to start worrying as far as top speed, never exceed speed? The other question is: Tire size? I had a hard time finding replacement tires that are the same height as the ones that I took off of the plane, they were 13 inches tall, and 4.00 x 5, 4 ply. I did find tires that are 11 inches tall. Does anyone have any experience with the small tires? I did put the 11's on but they do look a bit small for grass. Thanks Jeff Sellars |
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Hi Jeff - welcome to our world. I have seen 220 TAS once or twice. I race mine and my straight and level top speed is 210 mph.
I use these tires, 8 ply. http://www.aircraftspruce.com/catalog/lgpages/lambtires_tubes.php I have less than 2" clearance between the bottom of the wheel and and the pavement, but then, that's how I intentionally set it up for racing. Now some more questions for you. Where are you located? Did you get any orientation rides? Where did you get this aircraft? Who built it? What engine does it have? How much time on the aircraft? Has it flown off of grass before? I avoid it. Again, welcome in. Sam Hoskins - Q-200 Murphysboro, IL |
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quickieaircraft
Biggest concern with V_ne on this plane is flutter speed. There are a few built that have a V_ne higher than 200mph, I seem to remember 230mph somewhere. Mass balanced control surfaces are a must here. Also remember that, while Part 23 uses IAS to placard flutter speed because IAS is the most useful number in a cockpit, aircraft designers often hold that flutter speed is more precisely stated with respect to EAS or TAS. Put another way, the indicated airspeed at which flutter will occur decreases with altitude. Not often an issue in the certified world, but it did creep up on some of the RV's and eat into their flutter margins. -Emron Tri Q200, 15hrs |
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Hi Jeff,
Please send me an email at logistics_engineering@... if you need the original Chen Shin tires. I can help you. I posted a GPS pix a couple of years back in the files section showing 230 mph. I flutter tested N46JP to 240 mph during my initial flight phase and consistently fly it over 200 mph. The gross weight was set at 1320 lbs and I have flown it at that weight several times over the years. Once you determine if your plane was built correctly you should have no problems with flutter. In fact the faster a Q goes the smoother it becomes. Good luck and welcome aboard. Take Sam' s advise. Jim Patillo N46JP Q200 1200 hrs on my Q |
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Hi Jeff, Each airplane gets it's own Vne. I don't claim to be an expert but I understand you slowly increase your speed and slap gently your control stick to see if any high frequency oscillations (flutter) in roll pitch or yaw occur. Once you see some instability you pull the power fast before your control surfaces depart the aircraft. Thus, this is not to be taken lightly. I did my testing to 230 mph indicated and was wearing a parachute. I then set my Vne at 210 mph indicated. When the control surface hinge points wear and get sloppy the risk of a lower flutter speed is possible. Please understand that the Q200 has mass balanced ailerons and elevators. I don't think the Q2 did so it's probably not capable of those speeds. You may look at yours for a big hunk of lead on an arm on the elevators and an arm with a bunch of washers on the ailerons. Also the elevator control system is different from a Q2 to a Q200 and this could have an impact. One scary thing about a Q2/200 is from 180 to 230 there is not much sound difference, it does 230 real easy with power on and the nose down! This is why no one to my knowledge has ever done a loop in a Q. Going down it gains speed lightning fast!
Tires. I'm still running the Cheng Shin 4.00-5 (small option tires) as originally from the kit. The Black tires appear to be essentially unavailable. There are grey tires from that Mobility place for around $27 but they are a bit narrower and the rubber softer (not sure how they will wear). The mobility source now seems not to be able to get Cheng Shins and gets "Primo Diamond" which are the same size as the Grey Cheng Shins but with even softer rubber. This year I put on a set of the Black Cheng Shins and had the sidewall totally crack up in a short period of time. I suspect the black ones haven't been made for a while and are getting old. I haven't run any grey ones as I'm on my last set of Black Cheng Shins.
Grass. I've been on 3 different grass fields. I now stay away from grass. Those fields change too fast, a gopher digs a hole, fire ants mounds, manure spreaders fertilize them (what a mess I made to an Aeronca that day). It's just not worth the risk with a plane that lands at 70mph. If the airport facility directory says the runway is paved but "poor" I stay away also. I've landed on some awfull runways and it is scary. No more of that.
On Wed, Mar 19, 2014 at 12:27 AM, <kitfoxjeff@...> wrote:
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Jeff Sellars
Thanks for all of the great info, it sure is apreciated. I have seen photos of your Q, looks great.
My bird has the lead weights, the left hand brake controls, the LS-1 canard, flip forward canopy, and for some reason, the outer skin appears to be in carbon fiber? I do not know why, or how thick the carbon fiber is, or how that benefits me. Listed weight empty is 665. I will be messing with a few things for the next few weeks, then I plan on getting some ground time in on the thing. My questions about speed are because, it never seems to be enough. I like the thought of up grading my engine to the newer rev master 85HP 2300, but only if I can achieve some pretty great speed gains. So, how fast can I get this plane to fly strait and level, and how much power will it take to do that. Also, is it worth it to do a turbo? I guess only if I plan on going high a lot? And I do not right now, no heat. I have not been able to reach the original owner/builder so there are a lot of questions left unanswered with this one. PS. does anyone know where I can get a cover that is made for this plane? possible to cover the cockpit area? And hole out the rain and sun. Can an additional oil cooler be installed inside of the cockpit with a small electric fan to be used as cabin heat? |
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Jeff Sellars
Hello, and thanks for your info. I just installed those tires as well, the old ones that came off were 13 inches high. I see a big difference in ground clearance, but I can try to stay on pavement, and see how it goes for a while.
I got the plane from an in between guy who was scared of doing anything with it, so it just sat for a few years. I have not yet been able to reach the builder,. looks like he did a fine job, real clean lines everywhere, or should aI say no line any where. Weighted flight controls, everything oiled and balanced, smooth, LS-1 canard,forward tilt hatch, hand brake levers, the plane appears to be built with carbon fiber, at least the outer skins. I'm not sure. I am really excited. No orientation, but I now have about 300 hours into reading about the plane, everything on the net and in books, and I have seen every video out there. I do plan on getting to know the plane for about ten hours at least on the ground before atemption to hop her. I was told that it has 40 hours on it, how ever, the clock says 0, and the year built was 1999. No logs yet, still waiting to get the books from the seller. ---In Q-LIST@..., <sam.hoskins@...> wrote : Hi Jeff - welcome to our world. I have seen 220 TAS once or twice. I race mine and my straight and level top speed is 210 mph. I use these tires, 8 ply. http://www.aircraftspruce.com/catalog/lgpages/lambtires_tubes.php I have less than 2" clearance between the bottom of the wheel and and the pavement, but then, that's how I intentionally set it up for racing. Now some more questions for you. Where are you located? Did you get any orientation rides? Where did you get this aircraft? Who built it? What engine does it have? How much time on the aircraft? Has it flown off of grass before? I avoid it. Again, welcome in. Sam Hoskins - Q-200 Murphysboro, IL |
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Jeff Sellars
How do you achieve 210 mph flat and level? What engine and other things can you mention? Also, I just changed the tail wheel,and the new Matco hangs low, like 6 or 8 inches lower. Will this cut into my speed quite a bit? Looks like it may on a plane like this. Also, I guess this may increase my ground roll for takeoff? due to a decreased angle of attack?
Prop strikes? |
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Where are you located grasshopper?
Don't worry about speed. Worry about totaling you and the airplane on the first flight. You think I'm kidding? Slow down a little and let us help you. You need to have an experienced builder/flyer take a look at it for you.
You want to get some speed? Here is how I do it. http://samhoskins.blogspot.com/ Read everything. Sam On Mon, Mar 24, 2014 at 9:57 PM, <kitfoxjeff@...> wrote:
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Henry Hallam
Re the turbo, most people (self included) will tell you that there is little benefit to a turbo unless you also have a variable-pitch prop. Henry
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Speed vs power is the cube root of the hp. So say the plane has 65hp and goes 140mph. If you up the power to 85hp you got a 30.76% power increase. Thats 1.3076 do the cube root and you get 1.09 or 9% speed increase. So with 84hp you'd be going 153mph. That's why it's better to lower the drag than to bolt on HP. I use a white bedsheet sprayed with that water repelant stuff to cover mine when parked outside. Sure you can easily rig an oil cooler on the inside. But in cold wearher you don't want a cooler and hot weather you do so thats kinda counter productive. I have single brake handle. I rigged a bungie to hold slight pressure on the handle in flight to stop the wheels from turning. Mike Dwyer Q200 My YouTube channel: http://goo.gl/ddljYZ On Mar 24, 2014 11:30 PM, "Henry Hallam" <henry@...> wrote:
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Paul Fisher and I got a nice canopy cover from http://www.flightlineinteriors.com/ for about $160, I think. Real pleased with it. Sam On Mon, Mar 24, 2014 at 9:47 PM, <kitfoxjeff@...> wrote:
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