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Rex Rodebush
Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri
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 Posted: Fri Jul 19, 2013 8:24 am Post subject: First flight |
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Yesterday morning made my first flight in N553R! It's a Mark III X-tra with a 912S and a 3 blade Warp prop. It was one of the first Xtra's produced by TNK 13-14 years ago.
Everything went pretty well but there are a couple of things that I would like to hear the group's comments on.
The indicated stall was very repeatable at 55 MPH. This seems high to me but I did some quick glances at the GPS and I think my airspeed reads high. I will recheck this and may redo the static connection.
I have a fuel pressure sender to the EIS and I noticed that when throttling down from say 5000 rpm to 3000 rpm I had a low fuel pressure (set at 2 psi) indication for only about a second. Then it came immediately back to around 4-5 psi. I did not have the electric boost pump on at the time. This happened several times on throttle back.
I also noticed a fuel smell in the cockpit a couple of times which lasted about maybe 10 seconds. This seemed to occur when turning right? I checked all lined after the flight and there was no evidence of any leaks anywhere & all connections were tight. The tank vent is a ram air connection on the bottom of the cage, passenger side, about 3 inches from the landing gear socket. I'm thinking about relocating this.
Any comments would be appreciated. Thanks guys.
Rex Rodebush
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Mike Welch
Joined: 13 Feb 2011
Posts: 272
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| Posted: Fri Jul 19, 2013 8:38 am Post subject: First flight |
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Hi Rex,
Glad to hear your first flight went well. I was about to call you and ask where you were in your schedule for the flight.
As a guess…..I would say your airspeed indicator is off by quite a bit. Your plane ought to stall pretty close to all the
other Xtras, and from what I understand, that's a lot less than 55 mph. Just my opinion…
Mike Welch
do not archive
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Ralph B
Joined: 14 Apr 2007
Posts: 367
Location: Mound Minnesota
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| Posted: Fri Jul 19, 2013 8:49 am Post subject: Re: First flight |
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Rex, congratulations on your first flight.
Disconnect the static line on your ASI and it should read correctly.
Ralph B
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_________________
Ralph B
Kolb Kolbra 912uls
N20386
550 hours |
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Larlaeb
Joined: 02 Apr 2013
Posts: 75
Location: League City, Texas United States
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| Posted: Fri Jul 19, 2013 11:05 am Post subject: Re: First flight |
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Congratulations Rex! Glad it went safely. Your stall speed sounds very high to me.
Allan
Mk IIIC
20 Hours
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Ducati SS
Joined: 15 Oct 2009
Posts: 93
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| Posted: Sat Jul 20, 2013 2:59 am Post subject: Re: First flight |
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For the first flight of my Firefly I mounted a Hall airspeed indicator to the wing strut. They are cheap and supposed to be accurate. I was able to cross check with my panel ASI to verify readings. After verifying the panel ASI and plumbing I removed the Hall unit. I have a full enclosure and therefor use a static port mounted on the flat bottom of the nose cone.
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sat Jul 20, 2013 4:30 pm Post subject: First flight |
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Rex, Congratulations! Wonderful news to hear of another Mk III X in the air.You probably need to make some adjustments to the static port. You're probably pulling a little vacuum at the port.
Could you have the float level set a little high in one carb so that it spills a little gas out the overflow? Did you put in a fuel return line to control the pressure going to the carbs?
Rick Girard
do not archive
On Fri, Jul 19, 2013 at 11:24 AM, Rex Rodebush <jrrodebush(at)gmail.com (jrrodebush(at)gmail.com)> wrote:
| Quote: | --> Kolb-List message posted by: "Rex Rodebush" <jrrodebush(at)gmail.com (jrrodebush(at)gmail.com)>
Yesterday morning made my first flight in N553R! It's a Mark III X-tra with a 912S and a 3 blade Warp prop. It was one of the first Xtra's produced by TNK 13-14 years ago.
Everything went pretty well but there are a couple of things that I would like to hear the group's comments on.
The indicated stall was very repeatable at 55 MPH. This seems high to me but I did some quick glances at the GPS and I think my airspeed reads high. I will recheck this and may redo the static connection.
I have a fuel pressure sender to the EIS and I noticed that when throttling down from say 5000 rpm to 3000 rpm I had a low fuel pressure (set at 2 psi) indication for only about a second. Then it came immediately back to around 4-5 psi. I did not have the electric boost pump on at the time. This happened several times on throttle back.
I also noticed a fuel smell in the cockpit a couple of times which lasted about maybe 10 seconds. This seemed to occur when turning right? I checked all lined after the flight and there was no evidence of any leaks anywhere & all connections were tight. The tank vent is a ram air connection on the bottom of the cage, passenger side, about 3 inches from the landing gear socket. I'm thinking about relocating this.
Any comments would be appreciated. Thanks guys.
Rex Rodebush
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=404940#404940
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Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
[quote][b]
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The smallest miracle right in front of you is enough to make you happy.... |
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Rex Rodebush
Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri
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| Posted: Mon Jul 22, 2013 9:14 am Post subject: Re: First flight |
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Thanks for the comments guys. I plan to disconnect the static line from the probe and move it inside the cockpit and see what that does. I do have the fuel return line per Rotax recommendations. The engine is new from the factory so I would think the fuel float would be correct but will research that and see what it takes to change it.
Waiting on the weather for the second flight. It's either been gusty crosswinds or thunderstorms the last few days.
Rex
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Tue Jul 23, 2013 7:09 am Post subject: First flight |
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Rex, Just got through doing a carb overhaul on a customer's 912. The arms of the brass float lever should be parallel with the edge of the carb when held upside down and no pressure put on them that would depress the little spring in the needle valve. If the carbs were rebuilt then check to make sure they were adjusted properly as the new levers have to be fitted to the carb. If the engine is new Bing usually has these adjusted spot on so do the fuel return line first. Don't forget to put the restrictor orifice in the line. It's easiest to just get the Rotax parts as the spec for the orifice is .35 mm or .014". I hate drilling holes that small (#80 drill bit is .0135). If you have a lathe or a small drill press with a chuck that will hold a drill bit that small just take your time use WD 40 for lube and clean the drill often.
Rick Girard
do not archive
On Mon, Jul 22, 2013 at 12:14 PM, Rex Rodebush <jrrodebush(at)gmail.com (jrrodebush(at)gmail.com)> wrote:
| Quote: | --> Kolb-List message posted by: "Rex Rodebush" <jrrodebush(at)gmail.com (jrrodebush(at)gmail.com)>
Thanks for the comments guys. I plan to disconnect the static line from the probe and move it inside the cockpit and see what that does. I do have the fuel return line per Rotax recommendations. The engine is new from the factory so I would think the fuel float would be correct but will research that and see what it takes to change it.
Waiting on the weather for the second flight. It's either been gusty crosswinds or thunderstorms the last few days.
Rex
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=405082#405082
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arget="_blank">http://www.matronics.com/Navigator?Kolb-List
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="_blank">http://www.matronics.com/contribution
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Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
[quote][b]
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The smallest miracle right in front of you is enough to make you happy.... |
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GeoB
Joined: 16 Jun 2009
Posts: 207
Location: Fresno, CA
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| Posted: Wed Jul 24, 2013 1:52 am Post subject: First flight |
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| Quote: | take your time use WD 40 for lube
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I think you guys are more experienced at this.. but I will tentatively
suggest also trying chainsaw bar oil. It is viscous, stays in place a while
and removes chips pretty good. You can dip the drill bit in it once inna
while then go drill some more. I bought a gallon 30 years ago and it will
last me the rest of my life.
OFF TOPIC
I also have a good amount of Roundup. Again, about 30 years ago I bought a
gallon, split it with a friend and have used it carefully since. It too will
last me the rest of my life.
My wife passed a coupla years ago. She had so much STUFF. New stuff,
Christmas presents she opened and put back in the box for safe keeping,
'special' pretty things that she never used. $50,000 worth of diamonds she
would never wear. Her best china. I learned a lesson from that. I have made
some nephews and cousins and stuff happy cuz I looked through my gun
collection and figgered that realistically I'd never use THIS one or THAT
one again, so I gave them away. One nephew received a Hi Standard .22
pistol. He was so excited he never put it down again till they left to go
home. Oh, he was still holding it even then. Another got the .30-06 with the
new Redfield on it. A Belgium Browning FN. I been doing that with lots of my
stuff. I always have been an acquisitive guy, but I get a lot of joy outta
doing this, while I'm alive to see it!
I'm not feeling morbid but I am more in touch with my mortality (is that
possible?).
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_________________
GeoB
"Members of Congress should be compelled to wear uniforms like NASCAR drivers, so we could identify their corporate sponsors" |
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