N722KC KR-2S Corvair Performance Discussion

Viewer requested performance review flight. Come along as I discuss takeoff, cruise and weight.
Mykitlog.com/vr6chris
Flycorvair.com
Krnet.org

[@KidYuma1880]

Love too watch these KR1 & 2’s, I was former pilot lost health. I is so great to see Ken Rands still going strong. I personally knew Ken Rand & Stu Robinson in Huntington Beach CA in 70’s. I miss him a lot he opened doors for Experimental Aircrafts.

[@alexandrebrito3945]

Hi Chris, excellent video, I learned more about this beautiful CORVAIR engine and its KR2s, thanks for providing this valuable information. good job

[@vr6chrisvw]

Thank you

[@creekboy2893]

Thank Chris I appreciate the info! I like the speed you get. I probably need a little more gross weight. I want a good fast traveling plane for me my wife and baggage. If it was just me I’d go with the KR 2s if I could get one already built. Thanks again!

[@vr6chrisvw]

No problem! I appreciate the request and support.

[@dallasboricua21c]

Awesome video Chris... good job

[@vr6chrisvw]

Thank you.

[@charleswesley9907]

If your control surfaces are balanced it will go a lot faster . My KR2 went about 230 mph while pulling about 3.5 Gs on a pull out .

[@flyinfool2]

Based on the airspeed velocity of an unladen swallow, what performance increase do you anticipate with the upcoming new engine?

[@vr6chrisvw]

All the speed

[@Grip_Addict]

Nut tree?! I need to come see this someday!

[@vr6chrisvw]

Yep! Visit anytime

[@jasonandrewwilliams7695]

I really enjoyed this :) thanks for posting. I'm having trouble finding any info about the G limits and if the plane is capable of any gentleman aerobatics. Are you able to do any loops, rolls, or spins in this?

[@vr6chrisvw]

The G limits are a little old and based off of a gross weight of 980. That being said, I have bigger spars and other things. I have done aileron rolls and could probably do more I just don't.

[@charleswesley9907]

The KR2 was rated at 6 G up or inverted at 800# Its a very strong airplane . But of course its not a factory built so each build varies. As for spins I have spun my KR2 many times . But make sure you have a forward CG and spin training. As for the KR2S I would get more information from the Kit Provider .

[@mikestirewalt5193]

A fellow named Sam Bailey from Pratt, Kansas built three KR's and used one of them to do a full aerobatic routine at airshows. +9 -7 are the numbers on my KR-1½. There's never been an in-flight structural failure with the KR designs.

[@charleswesley9907]

@@mikestirewalt5193 With a standard construction its supposed to be 6 gs upright and inverted at 480#. Most are 700 to 750 . Mine was 660# empty.I think the airplane will stand more that you will want to experience . I tested mine in 45 degree accelerated stalls and it maintained altitude down to about 40 kt with a probable pitot tube stall completely manageable. But in a mush do not apply 75% power or it will snap into a spin.

[@gianlucaborra1939]

Hello Chris, I just bought one here in Italy and I’m trying to got as much info as I can. Just a quick question how many horse power your engine has? So cruise speed it’s about 170 mph right? Thanks for the info.

[@vr6chrisvw]

120 HP. I can get 190 mph down low and usually cruise up high around 170 mph

[@gianlucaborra1939]

@@vr6chrisvw thanks Chris love your videos I’m just wondering what cruise speed I can have with O200. Thanks for the answer.

[@vr6chrisvw]

Should be about the same

[@sicktj]

Is that an air fuel ratio gauge on the right? Wonderful airplane! The visibility looks amazing which is sometimes rare over the cowling.

[@vr6chrisvw]

Yes. It is an Innovate wideband O2 sensor

[@sicktj]

Do you run unleaded fuel? I've always wondered why there couldn't be a simple gauge like that installed on any aircraft to help with leaning.

[@vr6chrisvw]

I've only run 100LL since it's the same price as premium fuel here.

[@sicktj]

@@vr6chrisvw Do you think it will foul your o2 sensor?

[@vr6chrisvw]

I have gone through a couple O2 sensors in the last 160 hours.

[@stephkr2412]

Chris are you flying the hole flight with full throttle?

[@vr6chrisvw]

Yeah. My throttle doesn't come out until I want to descend.

[@stephkr2412]

So, oke, I do 45% throttle position in criuse flight. You are sure this 100% is oke for your engine?

[@vr6chrisvw]

Yeah, my redline is 3600 rpm. In cruise I see 3200-3300. 188 hours on the hobbs with no issues and oil analysis shows normal wear like all the other flying Corvairs.

[@mikestirewalt5193]

@@stephkr2412 Chris apparently operates his KR just as I do mine. I control power with fuel consumption/altitude, not throttle (unless I'm staying down low for some reason). Full throttle at 10.5 or 11.5 (or higher) renders only 55% power (more or less) WOT.

[@overcastfriday81]

Your numbers are mph instead of knots?

[@vr6chrisvw]

Yes

[@mikestirewalt5193]

Chris, with your diameter prop, your tips are going beyond mach and wasting power at the RPM's you've mentioned. Keep your diameter but add more pitch - enough to slow your tips down to 3100 (cruise). This will get you better speed and fuel consumption. You can research this to verify - don't take my comment as written in adamantine.

[@vr6chrisvw]

I don't know how you think that is the case. My prop tips aren't even close to mach even at redline

[@mikestirewalt5193]

@@vr6chrisvw Do more looking into it. I'm not good at argument. If I find a reference for you I'll post it.

[@vr6chrisvw]

I don't argue. I speak facts. At 3600 rpm and 0 degrees Celsius, my prop tip speed would be .78 mach. Which like I said, I don't cruise at. I agree that more pitch would be more fuel efficient, I have a prop with more pitch already, I took some pitch out to improve climb performance at gross weight and get the same cruise speed.

[@mikestirewalt5193]

In my experience you are way too worried about aft CG issues. Tail-first landings are the only price to be paid to be heavy in the rear. Advantage is one cruises faster. Important not to stall in an aft-CG config, but then that's probably why you're so concerned. Did you know Dan Heath is a two-plane KR builder who has built a Panther? kzbin.info/www/bejne/l16kcmOopa2le9E

[@vr6chrisvw]

My aft CG testing was to confirm I could safely handle the airplane heavy, with a passenger and make a safe landing in an emergency. It was a methodical approach to reach what I consider a safe envelope while carrying another life in my hands.

[@mikestirewalt5193]

@@vr6chrisvw I know. Everything you've done has been methodical and well-considered.