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  1. #201

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    RE: ESM P47 Build

    Congrats on the maiden!!! Nice flight and landing. Hope you have many more.

  2. #202
    voodoodb's Avatar
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    Guys I have the p47 and have been flying it for 2 years now. A great flying plane but mine is very sensitive on the elevator. I have dual rates set at 1/4" up and down with a little expo in it and that has helped. Also have shifted the cg back a bit from manual but it is still sensitive. Anyone else having this issue? Any suggestions?

  3. #203

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    Quote Originally Posted by voodoodb View Post
    Also have shifted the cg back a bit from manual but it is still sensitive. Anyone else having this issue? Any suggestions?
    Moving the CG aft will only make the elevator more sensitive. If you want it less sensitive you need to try moving the CG forward.

  4. #204
    voodoodb's Avatar
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    Sorry guys. I have moved the cg forward. Took out half of the weight in the tail I had added to balance it.

  5. #205
    Pull Up Now!'s Avatar
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    I agree, moving the tail back will increase sensitivity. Also, if I remember right, the CG from the plans is wrong. I did my own calculations based on MAC (Mean aerodynamic Chord) and have no sensitivity at all. The plane is heavy though, so heavy elevator input is needed automatically in turns or it loses altitude. Let us know how it turns out. Where IS your CG? If you let us know, I'll look at mine to compare.

  6. #206
    voodoodb's Avatar
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    The plans say 136 mm from LE. Mine is 132 right now. Do you know what yours is?

  7. #207

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    G'day all,
    have been flying mine for several years, CofG is about 110mm back from the centre join of the wing, it is good, very nice to fly, I have a DLE 30 in mine, all batteries up the front, no lead, flies like a charm,
    Oldtimer.

  8. #208
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    P47 Thunderbolt CG--FINALLY

    I finally got a chance to measure the CG location of my ESM p47. The engine is a Zenoah G38. Flies very powerfully. I didn't trust anything written on the box, or in the plans. So I recreated the wing planform in a CAD system based on actual measured points on the wing. I then figured out the 25% chord location for each station, representing the center of lift. I added them all up, and divided by the number of stations, giving me a MAC (mean aerodynamic chord) of 4.2" (106.68mm) as measured at the fuselage side. Here is the CAD file:

    Click image for larger version. 

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