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Old May 18, 2015, 12:30 PM
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......
I'm currently rebuilding my original hopeing to get it over 230mph. Got it to 214 last season but elevator fludder limited the attempt which was further complicated by an ESC fire. Fortunately Ed (A10Pilot) was kind enough to repair the fire damage at a modest cost. I'm in the process of installing MKS 6625 brushless servos with outside shaft support bearings. These units have a truly preloaded geartrain and are are popular with the DS crowd.......
Hi Joe
is the flutter caused by the elevator servos not having enough support or the elevator structure itself? I don't think my Spark is ever going to reach that speed level, but I'm curious to know. Thanks
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Old May 18, 2015, 01:26 PM
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aka JetMan Joe
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Quote:
Originally Posted by nerv View Post
Hi Joe
is the flutter caused by the elevator servos not having enough support or the elevator structure itself? I don't think my Spark is ever going to reach that speed level, but I'm curious to know. Thanks
Hi Nerv, it looked like the servos I used (Hyperion) had some play in the gear train. It did not appear that excessive to me but I guess at those speeds the play can turn into an oscillation depending on the resonance frequency of the system. Putting in the outrigger bearing was probably not necessary with the MKS servos but it does add additional stiffness so I went with it.

Joe
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Old Jun 04, 2015, 09:51 AM
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Jim H
Memphis
Joined Dec 2004
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Fedex will be dropping this on my door step tomorrow
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Old Jun 04, 2015, 09:56 AM
txshan130 is offline
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Aerial Appeal
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United States, TX, Katy
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Fedex will be dropping this on my door step tomorrow

A new spark kit??
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Old Jun 04, 2015, 11:09 AM
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Jim H
Memphis
Joined Dec 2004
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I guess we can call it new, for a plane that's been out of production for how many years?
Will have to get the back story on where this one came from.
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Old Jun 04, 2015, 11:09 AM
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EDF Jet Jam 2015, May 28-31st
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United States, KY, Crestview Hills
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fedex will be dropping this on my door step tomorrow

nice!
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Old Jun 04, 2015, 12:41 PM
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It looks like the wing's been signed by someone?
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Old Jun 04, 2015, 01:12 PM
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Jim H
Memphis
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Good eye Joe,
It was signed by musician Tommy Emmanuel.
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Old Jun 04, 2015, 02:35 PM
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jean-claude Terrettaz
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Carp, Ontario, Canada
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Thanks to E-Group I find a nice Stumax 100 mm for mine
And congratulation in the new purchase ...I like the paint
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