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tc1917(at)bellsouth.net
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 Posted: Tue Feb 02, 2010 4:01 am Post subject: dynamic balancing |
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I dont really know what you guys have for dynamic balancing but let me tell
you this story. I (we kolbers) figured it was the blade. Not faulting
anyone but the warp I had was three blade and was not very matched. Warp
made and sent me another one which was very very good. I have a model
airplane blade balancer (big one) and balanced it real nice. I also put it
on a center line balancer and it came out perfect. I use a laser to set my
blades to pitch. All this made it a lot quieter. Was worth the effort. I
also put a whole different blade set up on it complete with hub. Less blade
noise but still had the rum rum. Now, at this point I want to say there is
little or no vibration in the cockpit or on the airframe itself. Nothing is
vibrating. I feel very little in my stick. (a lot less since the new
prop)(thanks warp drive). I think I am going to actually take the wings off
before I load it to take it where-ever, probably Ronnies. That would
definitely prove it is not wing born. By the way, has anyone ever put the
spray in foam into the wing panels close to the root through the inspection
holes? I was thinking of that to quiet any vibration in there. That stuff
is light and tuff. When I turn the prop, the resistance I feel in the
engine is just probably normal stuff but I wanted to mention it. Cant be
anything really sever cause I havent had a moments trouble with the engine.
Everything else is just perfect. Talked to Lockwood Av. and they want me to
try another set of gears and see. Boy, would I like to go to Sebring Fl and
have them put it on their special noise evaluator what-ever that is. Long
trip, almost 600 ms from here. Anyway, thanks for the help. I have learned
an awful lot about my engine chasing this noise. Had to have everything
perfect to chase it. I laugh at all you guys worrying about how much drag
with engine out. he he he. Fly a Slingshot and you wont worry. There is
no glide path. What you see just below your windshield is where you are
going to land. Nose it down hard as you dare, keep up about 60 mph airspeed
and one flare only. You are down in about thirty feet rollout. Someones
backyard is big enough. (watch out for the slider and swings) Enough.
Take care and thanks. Ted Cowan, Alabama, 912UL.
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mdnanwelch7(at)hotmail.co
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slyck(at)frontiernet.net
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| Posted: Tue Feb 02, 2010 6:32 am Post subject: dynamic balancing |
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Don't do it. -At least if you are considering the "stuff" in the little cans.I tried it in a motor vehicle once and it wicks and holds moisture. Rusted out faster than ever.
BB
On 2, Feb 2010, at 8:50 AM, Mike Welch wrote:
| Quote: | > By the way, has anyone ever put the
| Quote: | spray in foam into the wing panels close to the root through the inspection
holes? Ted
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Ted,
Although the foam might be a good idea, you do have to be careful. There are 3 grades of the stuff (at least three that I know of). The grades vary by how much expansion pressure they have. The weak grade is for window gaps, etc. It doesn't distort the structure. The strong grade can and will spread apart the structure gap, like in a door frame gap. It can actually ruin the door fits to where it won't close anymore.
If you were to try using this foam, I'd recommend the middle expansion foam, and try it in a test area first. It would not be wise just to start spraying blobs of foam everywhere, only to find you've now got wings with bulgy muscles. 
Mike Welch
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mdnanwelch7(at)hotmail.co
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