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t.j.vanduin(at)gmail.com
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 Posted: Thu Dec 10, 2009 9:14 am Post subject: Low frequency vibration noise |
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Fellow Allegro-Listers,
Talking with a light aircraft owner, I was told that some of his friends
experienced
a low frequency noise in the headset that appeared to be related to the
flashing action
of the strobe lights during flight. I will soon find out if this is true in
my case also.
Did anyone have this experience with an Allegro aircraft?
Theo (in France)
Allegro 2000 (71MM)
2009/10/30, theo van duin <t.j.vanduin(at)gmail.com>:
[quote]
Hugh, Amy and Brad,
Thanks for your comments. I will check on the items you mentioned. It's
obvious that the propeller tracking check is a must and rather
easy to perform.
Theo (in France)
Allegro 2000 (71MM)
2009/10/28, Hugh MCKAY III <hgmckay(at)bellsouth.net>:
> Theo:
>
> Just "Google" the words *Propeller Tracking* and you will find the first
> listing to be a video of how to track a wooden propeller. The principal is
> the same for a three blade prop. It is easy to do. For the 912 UL engine I
> would suggest you remove one of the plugs from each of the four cylinders to
> relieve the cylinder compression before you track the prop. You can also
> check with one of your airplane mechanic friends and he can explain tracking
> further if you need help.
>
> The full take-off power of your engine (5200 rpm) is somewhat low due to
> the coarse pitch of the blades, but acceptable. Rotax's maximum engine
> take-off speed is 5800 rpm for no more than 5 minutes, and the maximum
> continuous engine rpm is 5500 rpm. The maximum rpm for your Woodcomp 3 blade
> prop is 2700 rpm. At your maximum engine rpm of 5200 rpm, the prop speed is
> only 2291 rpm which is well below the maximum allowed by Woodcomp. To
> increase the maximum take-off speed of your engine you would need to
> decrease the propeller pitch slightly. Unless you have someone who knows how
> to do this, and has done it in the past, I would not attempt it yourself
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brad(at)vision-technology
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| Posted: Thu Dec 10, 2009 9:28 am Post subject: Low frequency vibration noise |
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If I listen carefully with the engine at idle I can hear a small click when the strobes flash, but otherwise I don't notice anything. I can also hear a slight noise sometimes when the transponder replies.
Of course that could be different for each plane depending on the radio, intercom and headsets you're using.
In my case I'm using an iCom A200 radio, Flightcom intercom, KT76A transponder and Telex ANR4150 headset.
...brad.
N221FA
Bismarck ND
[quote]
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