FlyingGiants Forums - View Single Post - Great Planes 25% YAK-54

flyman1948 · 02-25-2007, 11:24 AM

Black Bird
I'll move the rudder servo test weight location to mid-ship. I did the CG test with the appropriate amounts of weight at the desired location. I'm using HS-645MG's, 133 Oz @ 6Vt. Weight with metal connecting rods is over 2 Oz each, so I added 8+ Oz. at the tail to simulate servo weight. Ingition battery will be in engine box mount. Rx battery 10" behind engine. FPE 2.4 engine/muffler/ignition system weighs 52 Oz. If I have to add weight I'll consider redundant battery.I'll check CG with test servo weight at mid-ship location and see what I end up with.
Did you fly the plane at the recomended CG (5 1/8 back) and how did it handle....? I'm impressed it flies well for you at 2 inches back...7 1/8". I'm interested in what ranges the CG location can be at and still fly well. Some posters have stated the factory location of 5 1/8 is way too conservative for their taste, one going so far as to say it felt nose heavy.
Thanks for the twisted wire tip..............

02-25-2007, 11:24 AM	#9 (permalink)
flyman1948 Flyin' Around Join Date: Feb 2007 Location: Meadville, Pennsylvania Posts: 12	Re: Great Planes 25% YAK-54 Black Bird I'll move the rudder servo test weight location to mid-ship. I did the CG test with the appropriate amounts of weight at the desired location. I'm using HS-645MG's, 133 Oz @ 6Vt. Weight with metal connecting rods is over 2 Oz each, so I added 8+ Oz. at the tail to simulate servo weight. Ingition battery will be in engine box mount. Rx battery 10" behind engine. FPE 2.4 engine/muffler/ignition system weighs 52 Oz. If I have to add weight I'll consider redundant battery.I'll check CG with test servo weight at mid-ship location and see what I end up with. Did you fly the plane at the recomended CG (5 1/8 back) and how did it handle....? I'm impressed it flies well for you at 2 inches back...7 1/8". I'm interested in what ranges the CG location can be at and still fly well. Some posters have stated the factory location of 5 1/8 is way too conservative for their taste, one going so far as to say it felt nose heavy. Thanks for the twisted wire tip..............