Originally Posted by
thundertiger76
So I wanted to try the Spitfire out today but I couldn't find anymore weight except for 100g more to add to the nose and I went with that.
So with 775g of lead to the nose in total at about 120mm from the leading edge and it seem to fly well although I had to trim a fair bit of up elevator in so perhaps it's still a little bit too heavy on the nose?
If its taking a lot of trim..(how much we talking..more than two clicks?) Just slowly..ounce at a time max...back off the nose weight..c of g is tunable..kinda like tire pressures on a race car. Small changes until its comfortable for you in all aspects..take off, flight, and landing.
Incidences=setting control throws. Your control surfaces should move a certain amount in either direction. Usually measured in degrees..there are incidence meters you can purchase. Again..this is tunable..
If I'm thinkibg right, based on engine size, the scale of your plane is about a 1/6. So should be pretty similar to other 1/6 spitfires.
Hanger 9 markets a 1/6..so download the manual for it from tower hobbies..conyrol throw will be detailed as to how much. Its a starting point. You may find it seems too sensative..in which case..back them off..not sensative enough..nudge in a little more..but it will get you in the ball park...some popsical sticks and a protractor (measures angles) can be cut to make a quick incidence meter..just cut it in half, 90 degree line to the hole for the corner of the angle..make it a goid, straight, cut. Line that uo with your hinge line and rig a way to hold it to the unmoving part of stab, wing, or rudder...tape the popsicle stick so it points back over the trailing edge of the surface to act as a pointer..and use your radio to move the surface...
If you are way off the book..just move the servo end points in your transmitter until max stick is close to the hanger 9's manual...say 5 degrees...
Robart makes an incidence meter thats basically the above..go take a look at the picture of it to get a visual on how to set up a home made.
Again, this is tunable..if other than trim, you like how it flies..don't "fix" what ain't broke. Tune your cg..and enjoy it..but you may find as you tune the cg you have to dial back how much your elevator can move..the closer to perfect balance you get..the more sensitive its going to get to the elevator..and also..somewhat...to the ailerons..so go slow..when you get close to how you want it to fly..go even slower..like tenth or a quarter of an ounce at a time..
Its not going to take much..you'll be close on 3..maybe 4 oz of weight removed.