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tc1917(at)hughes.net
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PostPosted: Fri Nov 23, 2007 3:13 am    Post subject: zoom-zoom Reply with quote
Just wanted to let my fellow Kolbers know that my little SlingShot is doing
well with the 912UL I just installed. Really cooks. Does an easy 1200 fpm
climb out without any strain at all. After many tests, seems I am getting
about 3 gal per hr burn at 82-85 mph indicated. (same same on the ground if
no wind). Now, I STILL have a problem though. Went through the archives
and see many have had or have the same problem. I have a warp three blade
with nickel edges. This set up makes the dog gonnest harmonic hum hum or
whatever you want to call it. drives you crazy. Just loud enough to
irritate the heck out of your ears. you can feel it on the back of the
helmet even. I have tuned and tuned, just did a vaccum tune and everything
is just about perfect from idle to 3500 + rpm. I have moved the exhaust
collecter from right exhaust to straight up. dont want to exhaust towards
the fuel pump on the left. I have set and reset the blades, sanded down the
edge on the back side of the blade where the nickel comes in. I even redid
some of my center gap and lower wing gap seals. Does anyone have the
answer? Does not appear the the engine is actually rolling, just making an
agonizing harmonizing sound. Can anyone out there give me the answer? Ted
Cowan, Alabama Happy Thanksgiving!

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jbhart(at)onlyinternet.ne
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PostPosted: Fri Nov 23, 2007 4:33 am    Post subject: zoom-zoom Reply with quote
At 05:12 AM 11/23/07 -0600, you wrote:
Quote:


agonizing harmonizing sound. Can anyone out there give me the answer? Ted
Cowan, Alabama Happy Thanksgiving!

Ted,


Could it be that your wing struts are the cause? Before I streamlined the
struts on the FireFly they strummed. The noise would ware you down after
and hour or so.

Jack B. Hart FF004
Winchester, IN

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agustafson(at)chartermi.n
Guest
PostPosted: Fri Nov 23, 2007 7:56 am    Post subject: zoom-zoom Reply with quote
Quote:
>agonizing harmonizing sound. Can anyone out there give me the answer?

Could be that Warp!!! Not quiet and efficient like an IVO (ooops, should I
say that?) Don't blame me for saying so, I'm just a dumb and happy flier. Ha
ha.

Aaron do not archive

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craig.nelson(at)heraeus.c
Guest
PostPosted: Sat Nov 24, 2007 5:42 am    Post subject: zoom-zoom Reply with quote
I have the same engine and prop on my extra. I flew it without the
windows and did not hear what was happening. I did see the results on
the ground but could not hear it in the air or figure what it was till I
put the windows and doors on. The prop is so close to the back of the
plane and the sound you hear I believe is the drumming of the fabric on
the right side of your fuselage. When I flew for the first time with
full enclosure it scared me. I put a piece of foam behind the controls
to stop the drumming and it went away. I plan to redo that part of the
plane in aluminum, right now its fabric. The drumming is cracking the
paint around my aileron gussets I made also around the small strut that
go's from the bottom of the rear window to the horizontal square tube
the back of the wing attach point. After the quick foam fix the sound
went away and the cracking of the paint has subsided----- Possibly
drumming?
Uncle craig
Do Not Nrchive

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