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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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 Posted: Wed Sep 16, 2009 8:58 am Post subject: Cuyuna EGT |
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Here's something I haven't seen addressed anywhere.
The Cuyuna manual gives 1200°F as the "best power" EGT and 1275° as the never exceed. On my UltraStar, I shoot for no more than 1200 during static runup (and I do a static runup until EGT stabilizes as part of every preflight). 1150 is typical, which gives me a safe buffer for EGT gague error, etc.
At cruise power, however (55-5800 rpm), the EGT is a bit higher, right around 1200. If I drop the needle one notch (the clip is currently in the second highest notch), the engine has a tendency to bog and in some cases it's reluctant to increase to full RPM from cruise. It seems to be happy where it is.
I know the EGT should climb when you slightly close the throttle from wide open, as the needle drops, but is it normal (or desirable) to have the cruise EGT higher than full throttle? At slower midrange settings (<5000 rpm) the EGT drops as I'd expect.
About my only complaint with the engine is the mmmmmMMMMMmmmmmMMMMMmmmmmMMMM between 5000-5500 rpm, which I attribute to exhaust/prop interference (2:1 reduction less normal belt slippage).
ULII-02, correctly propped (Culver 50X30, 6500 static rpm), Mikuni VM-32 carb.
-Dana
--
Growing old is inevitable, but we can stay immature indefinitely. [quote][b]
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jbhart(at)onlyinternet.ne
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| Posted: Wed Sep 16, 2009 10:12 am Post subject: Cuyuna EGT |
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Date: Wed, 16 Sep 2009 12:54:46 -0400
From: Dana Hague <d-m-hague(at)comcast.net>
| Quote: |
About my only complaint with the engine is the mmmmmMMMMMmmmmmMMMMMmmmmmMMMM
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between 5000-5500 rpm, which I attribute to exhaust/prop interference (2:1
reduction less normal belt slippage).
Dana,
I had a similar problem with the FireFly, until I streamlined my struts. It
stiffened them and they stopped strumming.
Jack B. Hart FF004
Winchester, IN
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Wed Sep 16, 2009 1:52 pm Post subject: Cuyuna EGT |
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At 03:19 PM 9/16/2009, Jack B. Hart wrote:
| Quote: | -
I had a similar problem with the FireFly, until I streamlined my struts. It
stiffened them and they stopped strumming.
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In my case I don't think it's the struts, as I can reach back and grab them
while flying with no effect. I'm retty sure it's the exhaust/prop interaction.
-Dana
--
I don't suffer from insanity. I enjoy every minute of it.
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Wed Sep 16, 2009 3:48 pm Post subject: Cuyuna EGT |
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Dana/Gang:
EGT sounds about like I would want my ULII02 to operate, if I can remember correctly after 24 years.
Also, the ULII02 is transitioning from being "off the pipe" to "coming on the pipe" at rpm between 5,000 and 5,000. Mine would never settle down in this rpm range. I usually flew at 5,800 rpm cross country, and any rpm when I was playing, and I played a lot with my Ultrastar!
john h
mkIII
Rock House, Oregon - Just in from fishing the Owyhee and bring home the small mouth bass and blue cat fish.
[quote] About my only complaint with the engine is the mmmmmMMMMMmmmmmMMMMMmmmmmMMMM between 5000-5500 rpm, which I attribute to exhaust/prop interference (2:1 reduction less normal belt slippage).
ULII-02, correctly propped (Culver 50X30, 6500 static rpm), Mikuni VM-32 carb.
-Dana
[b]
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Wed Sep 16, 2009 4:17 pm Post subject: Cuyuna EGT |
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At 07:35 PM 9/16/2009, John Hauck wrote:
| Quote: | Dana/Gang:
EGT sounds about like I would want my ULII02 to operate, if I can remember correctly after 24 years.
Also, the ULII02 is transitioning from being "off the pipe" to "coming on the pipe" at rpm between 5,000 and 5,000. Mine would never settle down in this rpm range. I usually flew at 5,800 rpm cross country, and any rpm when I was playing, and I played a lot with my Ultrastar! |
Sounds good. It "feels" right, but I wanted to compare my numbers with others. Same here, it doesn't like to hold an rpm between 5-5500. Doesn't really look like any kind of tuned exhaust, though, unless there's a diverging/converging setup inside the muffler.
I "play" less than I'd like to, due to the age of the airframe and the fact that I personally didn't build it. The aerobatic ultralight I'm designing now will take care of that urge, though... 
-Dana
--
People in cars cause accidents. Accidents in cars cause people. [quote][b]
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slyck(at)frontiernet.net
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| Posted: Wed Sep 16, 2009 4:43 pm Post subject: Cuyuna EGT |
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Tell us about the new project.BB
On 16, Sep 2009, at 8:09 PM, Dana Hague wrote:
[quote] At 07:35 PM 9/16/2009, John Hauck wrote:
| Quote: | Dana/Gang:
EGT sounds about like I would want my ULII02 to operate, if I can remember correctly after 24 years.
Also, the ULII02 is transitioning from being "off the pipe" to "coming on the pipe" at rpm between 5,000 and 5,000. Mine would never settle down in this rpm range. I usually flew at 5,800 rpm cross country, and any rpm when I was playing, and I played a lot with my Ultrastar! |
Sounds good. It "feels" right, but I wanted to compare my numbers with others. Same here, it doesn't like to hold an rpm between 5-5500. Doesn't really look like any kind of tuned exhaust, though, unless there's a diverging/converging setup inside the muffler.
I "play" less than I'd like to, due to the age of the airframe and the fact that I personally didn't build it. The aerobatic ultralight I'm designing now will take care of that urge, though...
-Dana
--
People in cars cause accidents. Accidents in cars cause people. | Quote: |
href="http://www.matronics.com/Navigator?Kolb-List">http://www.matronics.com/Navigator?Kolb-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
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[b]
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Wed Sep 16, 2009 5:19 pm Post subject: Cuyuna EGT |
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At 08:42 PM 9/16/2009, robert bean wrote:
| Quote: | Tell us about the new project.
BB
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Well, this is not Kolb related, so sorry, John, and do not archive...
The only ultralight I know of that was really designed for acro was the
Quicksilver Super, and it's... well... a Quicksilver (and really doesn't
make 103 weight). Besides, they're _really_ rare.
Mine will sort of resemble an early Curtiss Pusher, though it's not
intended to be any kind of historical replica. Biplane for strength and
roll rate, pusher for comfort (no windshield!). 447 or maybe a Kaw 440
with a pumper carb, semi-symmetrical airfoil so I can fly inverted,
taildragger (unlike the Curtiss, 'cuz I prefer taildraggers). Aluminum
wings/tail with Stits and steel tube forward fuselage like a Kolb (OK, it's
sorta Kolb related!) At this point I'm still doing the very preliminary
design and doodling construction details... other projects (like home
repairs) have to happen first if I want to stay married, and I do... it'll
be a few years before I actually start construction.
-Dana
--
When Columbus came to America, there were no taxes, no debts, and no
pollution. The women did all the work while the men hunted or fished all
day. Ever since then, a bunch of idiotic do-gooders have been trying to
"improve" the place.
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