Posted 5 Dec 2016 (edited) I doubt that any of my 4 Avids flew at a CG of 15" or more. Usually probably around 13". None had a heavy engine in front, but they all flew fine. Maybe you're trying fix a problem that doesn't really exist. Have you flown the plane at a more forward CG and don't like it? :-) JImChukIf you are just trying to fix a "stick-heavy forward" and don't have a way to put the forward edge of the horizontal stabilizer farther down, and don't have a trim tab on the elevator, then you could add a simple aluminum tab to your elevator and bend it to trim the pressure on your controls. Adjusting the flaperons up to about 3 degrees upward will also raise the nose, and you can always use the "Jim Chuk Method" of putting a bungee cord on the stick!I think that moving the header tank and fuel pumps rearward will help your CG in a better way than adding weight to the tail, and maybe figure out how to carry some baggage too. Tools are always nice to have with you. Two other things to consider are getting a lighter prop and if your radiator(s) location is in the nose, moving it to the belly will help. EDMO Edited 5 Dec 2016 by EDMO Share this post Link to post Share on other sites
Posted 5 Dec 2016 I was just taking everyone suggestions on their experience that they handle much better with a 15" or more. Currently without making this modification my max load CG is low 12's and min CG is mid 11's. So I was just hoping to get closer to the middle if possible. Additionally I was thinking of making an adjustable bracket that'll allow me to move the header tank forward and back depending on how I felt she flew. Make small adjustments from there. I do have an electric trim on the elevator. Share this post Link to post Share on other sites
Posted 6 Dec 2016 I'm not sure bout that fuel cell. I would do some testing on it, I would sure hate to see that filler cap start to leak,And Jim that first video was pretty good I really thought you flipped for a sec there, Share this post Link to post Share on other sites
Posted 6 Dec 2016 (edited) I'm not sure bout that fuel cell. I would do some testing on it, I would sure hate to see that filler cap start to leak,And Jim that first video was pretty good I really thought you flipped for a sec there,I was wondering about that cap too - Why would you need a cap on a header tank? Could you replace that part with a solid plate? It looks like the top plate is bolted on. EDMO Edited 6 Dec 2016 by EDMO Share this post Link to post Share on other sites
Posted 6 Dec 2016 And Jim that first video was pretty good I really thought you flipped for a sec there,Glad you liked it. I enjoy humor where ever I can find it. ;-) JImChuk Share this post Link to post Share on other sites
Posted 6 Dec 2016 I'm not sure bout that fuel cell. I would do some testing on it, I would sure hate to see that filler cap start to leak,And Jim that first video was pretty good I really thought you flipped for a sec there,I was wondering about that cap too - Why would you need a cap on a header tank? Could you replace that part with a solid plate? It looks like the top plate is bolted on. EDMOi haven't taken a good look it's still in the box on the shelf but I recall when I first had it it's a very tight seal. But I will for sure test it out, and if need be, I can remove it and weld on a plate to seal it off completely. Share this post Link to post Share on other sites
Posted 6 Dec 2016 And Jim that first video was pretty good I really thought you flipped for a sec there,Glad you liked it. I enjoy humor where ever I can find it. ;-) JImChukI thought the exact same. Gave me an "oh $h!t" moment Share this post Link to post Share on other sites
Posted 6 Dec 2016 (edited) I'm not sure bout that fuel cell. I would do some testing on it, I would sure hate to see that filler cap start to leak,And Jim that first video was pretty good I really thought you flipped for a sec there,I was wondering about that cap too - Why would you need a cap on a header tank? Could you replace that part with a solid plate? It looks like the top plate is bolted on. EDMOi haven't taken a good look it's still in the box on the shelf but I recall when I first had it it's a very tight seal. But I will for sure test it out, and if need be, I can remove it and weld on a plate to seal it off completely. Looks to me like you could just unbolt the plate with the hole in it and make a solid one to bolt on top of the gasket. WARNING: I read that this tank is foam-filled and cannot be used with Alcohol fuels! EDMO Edited 6 Dec 2016 by EDMO Share this post Link to post Share on other sites
Posted 6 Dec 2016 Ah yes, that would be much easier. Share this post Link to post Share on other sites
Posted 6 Dec 2016 I'm not sure bout that fuel cell. I would do some testing on it, I would sure hate to see that filler cap start to leak,And Jim that first video was pretty good I really thought you flipped for a sec there,I was wondering about that cap too - Why would you need a cap on a header tank? Could you replace that part with a solid plate? It looks like the top plate is bolted on. EDMOi haven't taken a good look it's still in the box on the shelf but I recall when I first had it it's a very tight seal. But I will for sure test it out, and if need be, I can remove it and weld on a plate to seal it off completely. Looks to me like you could just unbolt the plate with the hole in it and make a solid one to bolt on top of the gasket. WARNING: I read that this tank is foam-filled and cannot be used with Alcohol fuels! EDMOThere is no need for foam to be in a header tank - the tank should be completely full at all times, so there should be no sloshing of fuel. EDMO Share this post Link to post Share on other sites
Posted 6 Dec 2016 I'm not sure bout that fuel cell. I would do some testing on it, I would sure hate to see that filler cap start to leak,And Jim that first video was pretty good I really thought you flipped for a sec there,I was wondering about that cap too - Why would you need a cap on a header tank? Could you replace that part with a solid plate? It looks like the top plate is bolted on. EDMOi haven't taken a good look it's still in the box on the shelf but I recall when I first had it it's a very tight seal. But I will for sure test it out, and if need be, I can remove it and weld on a plate to seal it off completely. Looks to me like you could just unbolt the plate with the hole in it and make a solid one to bolt on top of the gasket. WARNING: I read that this tank is foam-filled and cannot be used with Alcohol fuels! EDMOThere is no need for foam to be in a header tank - the tank should be completely full at all times, so there should be no sloshing of fuel. EDMOThank you for the heads up EDMO, the funny part is I thought the foam inside was just to protect for shipping or something. I had full intentions of removing it and still will be. Thanks Share this post Link to post Share on other sites
Posted 6 Dec 2016 Dump a little E-85 in there the foam will disappear Share this post Link to post Share on other sites
Posted 7 Dec 2016 (edited) Dump a little E-85 in there the foam will disappearGet a pint of 100 proof grain alcohol and it will do the same job, or at least clean up what you cant dig out. EDMO Edited 7 Dec 2016 by EDMO Share this post Link to post Share on other sites
Posted 7 Dec 2016 Just took it out of the box and all of the cubes were not adhered inside, just stuffed in. Probably why I originally thought it was for packing surfaces. Thanks for the help guys. Share this post Link to post Share on other sites
Posted 18 May 2017 Nice Air-stream you have in that one picture. Rick Share this post Link to post Share on other sites