What is the prefered CG for a Wildhare Extra 260?

I plan to fly IMAC 90% and 3D 10%

Dan, I started at the recommended distance back from the leading edge and moved it back from there. The next time I have it put together I will put it on my"Long Legs" balancer and give you the exact distance back. I do know that I have it balanced such that I can pull a 45 degree upline, roll inverted and it stays on course - no up or down needed, only application of rudder if it needs wind correction. Now, I did do some mixing of rudder - elevator -aileron to get true yaw-only rudder input. If you don't do that, you will be fighting the plane all over the sky!!! Call me if you want more discussion or detail.

Bobby

Bobby I am just trying to get some hard numbers. I take a lot of time routing wires and securing everything and the less I have to move things to change the CG the better.

I set my CG one of two ways either I mark the CG at the wingtips like it shows in the manual and get a second person th help pick the plane up, or I mark the CG at the wingtips, Install the wings on the wingtube, without the fuseladge, and stretch a string between the marks and mark closer to the fuse, then I take a GP balencer and check it there.

I an very curious what your hard numbers come out to be and where on the wing you check it.

Initially, I did the "put both wing panels onto the wing tube and streatch a string" trick from the wing tips. I had put a piece of maksing tape under the approximate positon so with the tape pull snug, I made a pen mark on both wing panels. Then when I put the fuselage on and suspended the wings from the balancer, I could move the batteries around to get it to balance at the correct point!!

What is the weight of the BME 110 + prop + spinner/backplate + mufflers (DA 100 about 6.5 lbs for these items)? With my setup, I have two 8411s in the tail, two 4800 Duraltie Plus Li-ion batteries on the rear of the servo tray with the 2800 Li-ion iginition battery on the front of the servo tray.

Bobby

DNTMN;

Read my post in the "WH Extra Special build FWD CG problem, below. I gave
a method to locate where the CG is located using a math formula. that can be compared
to the marks on the root end of the wing.

Gerald

around 4lb 14oz for motor prop spinner backplate and mufflers.

If you get a chance I am still curious on your hard numbers. I have no problem checking or setting the CG I just want to know where in others opinions the best IMAC position to set it to so I don't have to move to much around after the maindn. I am guessing the ruder will go pull pull with the ignition batery on the motor box and the receiver bateries on the tray.


Thanks

My hard numbers (if you mean location in inches) will be 3 and 1/2 to 3 and 3/4".
My intention is to fly straight IMAC areobatics. Tom recommends a CG location
that will make the first flight safer with a more fwd CG, in my opinion. My next step
is to balance the airplane so when I do a 45 degree upline, roll the plane on it's back.
and if it continues straight up 45 degrees, it's balanced for how I need it, and I don't
care where the CG is actually located.
Others will tell you that they prefer the CG further back for 3D flying, and they all do
not follow a uniform number.
Therefore, figure out what you want to do with the plane, and decide where the CG
would best be located for that type of flying. Batteries and rudder servo(s) are best
installed last, to allow adjustsments as necessary.

Gerald

Dntm, with the 100, little heavier then your 110, I have the batteries in the tray behind the hatch, ignition batt. is directly behind the wing tube, rudder servos are pull-pull. The cg with my setup is 3&7/8ths & it could go further back for 3D but I like it where it is. I think you are going to need your flight batts to be up fwd of the wing tube with that engine but thats just a guess. Mine is balanced near perfect for IMAC but then I don't have any coupling to speak of either. I haven't spent a day with no wind mixing it out yet because it's so smooth the one good day for it I just burned gas getting comfortable with it. Every other time I have been out with the bunny we have had wind & thats not a good time to sort out mixes.

It looks like 3 3/4 to 3 7/8 might be the magic IMAC numbers.

My battery locations may be a little different because I am using Carbon Fiber Spinner, Carbon Fiber Wing tube, Carbon Fiber tail Tubes, Carbon Fiber Main Gear, and Carbon Fiber Tail Gear. The batteries are 3 Fromeco Lithium 2400mha packs two for rx and 1 for ignition. If My rudder servo is pull-pull then I will use 1 HS 5955TG If the ruder servos end up in the tail I will use Two HS-5955TG.

I have all the CF you do except for the main gear. The stuff Tom supplies is light enough I didn't feel there was a significant savings there & strengthwise it is pretty light, so I figured it might wind up giving when the TnT carbon gear wouldn't & maybe save the plane from a less then perfect landing one day. Low & behold, 'bout a month ago I hit a clump of dirt on the runway and folded the right side gear back, no damage to the plane at all. I replaced the gear with the same stuff as before.

I think I got a light one as my all up weight with the carbon & the BME 100 is 22lb. 5 oz. Kicker of that is it includes a Sullivan smoke pump & 32 oz. tank. It doesn't include the smoke oil though.